void PWD_Config(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;//定时器初始化结构
TIM_ICInitTypeDef TIM_ICInitStructure; //通道输入初始化结构
GPIO_InitTypeDef GPIO_InitStructure;
//浮动输入方式
GPIO_InitStructure.GPIO_Pin = /* GPIO_Pin_0 | */GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_Init(GPIOB, &GPIO_InitStructure);
//输出初始化
TIM_TimeBaseStructure.TIM_Period = 65535; //周期
TIM_TimeBaseStructure.TIM_Prescaler = 720; //时钟分频
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//模式
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);//基本初始化
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
//捕捉初始化
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;//下降沿
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;//管脚与寄存器对应关系
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;//分频器
TIM_ICInitStructure.TIM_ICFilter = 0x4; //滤波设置，经历几个周期跳变认定波形稳定0x0～0xF
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;//通道选择
// TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInit(TIM4, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;//通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_3;//通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_ICInitStructure.TIM_Channel = TIM_Channel_4;//通道选择
TIM_ICInit(TIM2, &TIM_ICInitStructure); //初始化
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1); //选择时钟触发源
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);//触发方式
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_ITConfig(TIM2, /*TIM_IT_CC1|*/TIM_IT_CC2|TIM_IT_CC3|TIM_IT_CC4, ENABLE); //打开中断
TIM_SelectInputTrigger(TIM4, TIM_TS_TI1F_ED); //选择时钟触发源
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);//触发方式
TIM_SelectMasterSlaveMode(TIM4, TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_ITConfig(TIM4, TIM_IT_CC1, ENABLE); //打开中断
TIM_Cmd(TIM2, ENABLE); //启动TIM2
TIM_Cmd(TIM4, ENABLE);
}
static void reset_hsync_timers()
{
// Stop both timers
TIM_Cmd(dev_cfg->pixel_timer.timer, DISABLE);
uint32_t tim_id;
const struct pios_tim_channel *channels = &dev_cfg->hsync_capture;
// BUG: This is nuts this line is needed. It simply results in allocating
// all the memory but somehow leaving it out breaks the timer functionality.
// I do not see how these can be related
if (failcount == 0) {
if (PIOS_TIM_InitChannels(&tim_id, channels, 1, &px_callback, 0) < 0) {
failcount++;
}
}
dev_cfg->pixel_timer.timer->CNT = 0xFFFF - 100; // dc;
// Listen to Channel1 (HSYNC)
switch (dev_cfg->hsync_capture.timer_chan) {
case TIM_Channel_1:
TIM_SelectInputTrigger(dev_cfg->pixel_timer.timer, TIM_TS_TI1FP1);
break;
case TIM_Channel_2:
TIM_SelectInputTrigger(dev_cfg->pixel_timer.timer, TIM_TS_TI2FP2);
break;
default:
PIOS_Assert(0);
}
TIM_SelectSlaveMode(dev_cfg->pixel_timer.timer, TIM_SlaveMode_Trigger);
}
void config_tim3( void )
{
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ICStructInit( &TIM_ICInitStructure );
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
/* Select the TIM3 Input Trigger: TI2FP1 */
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
/* Enable the CC1 Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
}
void Freq_Meter_Init(void)
{
/* TIM Configuration */
TIM_Config();
/* TIM4 configuration: PWM Input mode ------------------------
The external signal is connected to TIM4 CH2 pin (PB.07),
The Rising edge is used as active edge,
The TIM4 CCR2 is used to compute the frequency value
The TIM4 CCR1 is used to compute the duty cycle value
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM4, &TIM_ICInitStructure);
/* Select the TIM4 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM4,TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM4, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);
}
void TIM4_Init(void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* TIM4 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
/* GPIOB clock enable */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
/* TIM4 chennel2 configuration : PB.07 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect TIM pin to AF2 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_TIM4);
TIM_TimeBaseStructure.TIM_Period = 0xffff; //设置自动重装载寄存期的值
TIM_TimeBaseStructure.TIM_Prescaler =83; //设置用来作为TIMx时钟频率除数的预分频值 1Mhz的计数频率
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV4; //设置时钟分割:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM向上计数模式
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure); //根据TIM_TimeBaseInitStruct中指定的参数初始化TIMx的时间基数单位
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV4;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM4, &TIM_ICInitStructure);
/* Select the TIM4 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM4,TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM4, ENABLE);
/* Enable the CC2 Interrupt Request */
/* Enable the TIM4 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
// 计时器设置为PWM捕获器，此时只能捕获1路
// eg: TIM5, CH2, 捕获PA1
void Timer::mode_pwm_input(PinTypedef p) {
Pin pin(p); // 函数调用后变量就消失了
uint8_t tmp = this->GPIO_AF_TIM(this->TIM);
// 看看tmp有没有问题
pin.mode_pwm_input(tmp);
NVIC_InitTypeDef NVIC_InitStructure; // 中断初始化器
NVIC_InitStructure.NVIC_IRQChannel = this->IRQn;
// 低频高优先级原则，20mS的捕获中断设为最高优先级
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; // IRQ 通道使能
NVIC_Init(&NVIC_InitStructure);
// 时钟预分频
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructrue; // 计时器分频初始化器
TIM_TimeBaseStructrue.TIM_Prescaler = PRESCALER;
TIM_TimeBaseStructrue.TIM_Prescaler = PRESCALER;
switch (this->TIM_No) {
case (1):
case (8):
case (9):
case (10):
case (11): {
TIM_TimeBaseStructrue.TIM_Prescaler = PRESCALER_APB2;
break;
}
}
TIM_TimeBaseStructrue.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructrue.TIM_Period = PERIOD;
TIM_TimeBaseStructrue.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(this->TIM, &TIM_TimeBaseStructrue);
// 设置TIM5 CH2 pin为外部信号输入
// CCR2测频率
// CCR1测占空比
TIM_ICInitTypeDef TIM_ICInitStructure; // 计时器模块初始化器
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2; // input channel 2
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; // 上升沿中断
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; // map IC1 to TI1
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; // 输入分频，不分频
TIM_ICInitStructure.TIM_ICFilter = 0x00; //滤波设置，经历几个周期跳变认定波形稳定0x0～0xF
TIM_PWMIConfig(this->TIM, &TIM_ICInitStructure);
/* Select the TIM5 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(this->TIM, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(this->TIM,TIM_SlaveMode_Reset);//TIM从模式：触发信号的上升沿重新初始化计数器和触发寄存器的更新事件
TIM_SelectMasterSlaveMode(this->TIM,TIM_MasterSlaveMode_Enable); //启动定时器的被动触发
TIM_Cmd(this->TIM, ENABLE); // run TIM5
// 设置中断ISR为PWM Input模式中断
// this->set_IRQHandler(Timer::PWM_Input_Handler_Dispatch);
if ((TIM_No==1)||(TIM_No==8))
TIM_ITConfig(this->TIM, TIM_IT_Update, ENABLE); // 打开中断，不要
else
TIM_ITConfig(this->TIM, TIM_IT_CC2, ENABLE); // 打开中断，TIM_IT_Update不要
}
//timer 1
void pwmInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
pwmSetConstants();
// TIM1 channel 1 pin (PA.08) configuration
GPIO_InitStructure.GPIO_Pin = PWM_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(PWM_PORT, &GPIO_InitStructure);
// Enable the TIM1 global Interrupt
NVIC_InitStructure.NVIC_IRQChannel = PWM_IRQ;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_TimeBaseStructInit(&TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = (PWM_CLK_DIVISOR-1);
TIM_TimeBaseStructure.TIM_Period = 0xffff;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(PWM_TIM, &TIM_TimeBaseStructure);
TIM_ICInitStructure.TIM_Channel = PWM_CHANNEL;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(PWM_TIM, &TIM_ICInitStructure);
// Select the TIM Input Trigger: TI1FP1
// 滤波后的定时器输入1(TI1FP1)
TIM_SelectInputTrigger(PWM_TIM, TIM_TS_TI1FP1);
// Select the slave Mode: Reset Mode
TIM_SelectSlaveMode(PWM_TIM, TIM_SlaveMode_Reset);//复位模式
// Enable the Master/Slave Mode
TIM_SelectMasterSlaveMode(PWM_TIM, TIM_MasterSlaveMode_Enable);
// TIM enable counter
TIM_Cmd(PWM_TIM, ENABLE);
pwmIsrAllOn();
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
/* TIM Configuration */
TIM_Config();
/* ---------------------------------------------------------------------------
TIM4 configuration: PWM Input mode
In this example TIM4 input clock (TIM4CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM4CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM4CLK = HCLK / 2 = SystemCoreClock /2
External Signal Frequency = TIM4 counter clock / TIM4_CCR2 in Hz.
External Signal DutyCycle = (TIM4_CCR1*100)/(TIM4_CCR2) in %.
--------------------------------------------------------------------------- */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM4, &TIM_ICInitStructure);
/* Select the TIM4 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM4,TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM4, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM4, TIM_IT_CC2, ENABLE);
while (1);
}
void hall_sensor_init (void)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// timer base configuration
// 84 => 655ms till overflow ; 100kHz (10us) TimerClock [24MHz/Prescaler]
TIM_TimeBaseStructure.TIM_Prescaler = 240;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
// enable hall sensor
// T1F_ED will be connected to HallSensors Inputs
// TIM3_CH1, TIM3_CH2, TIM3_CH3
TIM_SelectHallSensor(TIM3, ENABLE);
// HallSensor event is delivered with signal TI1F_ED
// (this is XOR of the three hall sensor lines)
// Signal TI1F_ED: falling and rising edge of the inputs is used
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1F_ED);
// On every TI1F_ED event the counter is resetted and update is tiggered
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
// Channel 1 in input capture mode
// on every TCR edge (build from TI1F_ED which is a HallSensor edge)
// the timervalue is copied into ccr register and a CCR1 Interrupt
// TIM_IT_CC1 is fired
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
// listen to T1, the HallSensorEvent
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_TRC;
// Div:1, every edge
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM3, &TIM_ICInitStructure);
/* Enable the TIM3 Trigger Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_Trigger, ENABLE);
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure and enable TIM3 interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_Cmd(TIM3, ENABLE);
}
void hw::spindle::initialize()
{
// Index pin
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_StructInit(&GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = _index_pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(_index_port, &GPIO_InitStructure);
// Get system frequency
RCC_ClocksTypeDef RCC_Clocks;
RCC_GetClocksFreq(&RCC_Clocks);
// Setup timer for index pin
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_DeInit(_index_timer);
// Tick every 0.1ms
TIM_TimeBaseStructure.TIM_Prescaler = (RCC_Clocks.HCLK_Frequency / 10000)
- 1;
TIM_TimeBaseStructure.TIM_Period = 0xffff;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(_index_timer, &TIM_TimeBaseStructure);
// Configure capture
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 2;
TIM_ICInit(_index_timer, &TIM_ICInitStructure);
// Configure slave mode, reset on capture
TIM_SelectSlaveMode(_index_timer, TIM_SlaveMode_Reset);
TIM_SelectInputTrigger(_index_timer, TIM_TS_TI1FP1);
// We don't want capture event to generate update interrupt.
// Update interrupt is used to detect cases when spindle speed is too low
// (or spindle is stopped)
TIM_UpdateRequestConfig(_index_timer, TIM_UpdateSource_Regular);
// Configure interrupts
TIM_ClearITPendingBit(_index_timer, TIM_IT_Update | TIM_IT_CC1);
TIM_ITConfig(_index_timer, TIM_IT_Update | TIM_IT_CC1, ENABLE);
TIM_Cmd(_index_timer, ENABLE);
}
/*采用PA.0 作为外部脉冲计数*/
void pulse_init( void )
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* TIM5 clock enable */
RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM5, ENABLE );
/* GPIOA clock enable */
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_GPIOA, ENABLE );
/* TIM5 chennel1 configuration : PA.0 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init( GPIOA, &GPIO_InitStructure );
/* Connect TIM pin to AF0 */
GPIO_PinAFConfig( GPIOA, GPIO_PinSource0, GPIO_AF_TIM5 );
/* Enable the TIM5 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init( &NVIC_InitStructure );
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig( TIM5, &TIM_ICInitStructure );
/* Select the TIM5 Input Trigger: TI1FP1 */
TIM_SelectInputTrigger( TIM5, TIM_TS_TI1FP1 );
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode( TIM5, TIM_SlaveMode_Reset );
TIM_SelectMasterSlaveMode( TIM5, TIM_MasterSlaveMode_Enable );
/* TIM enable counter */
TIM_Cmd( TIM5, ENABLE );
/* Enable the CC2 Interrupt Request */
TIM_ITConfig( TIM5, TIM_IT_CC2, ENABLE );
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* System Clocks Configuration */
RCC_Configuration();
/* NVIC configuration */
NVIC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
/* TIM3 configuration: PWM Input mode ------------------------
The external signal is connected to TIM3 CH2 pin (PA.01),
The Rising edge is used as active edge,
The TIM3 CCR2 is used to compute the frequency value
The TIM3 CCR1 is used to compute the duty cycle value
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
/* Select the TIM3 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
while (1);
}
void TIM2_PWMINPUT_INIT(u16 arr,u16 psc)
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; //TIM???????
NVIC_InitTypeDef NVIC_InitStructure; //????
TIM_ICInitTypeDef TIM2_ICInitStructure; //TIM2 PWM?????
GPIO_InitTypeDef GPIO_InitStructure; //IO??????
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); //Open TIM2 clock
// RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE); //open gpioB clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_AFIO, ENABLE); //??GPIO???AFIO????????
GPIO_PinRemapConfig(GPIO_Remap_SWJ_JTAGDisable,ENABLE); //??JTAG
GPIO_PinRemapConfig(GPIO_FullRemap_TIM2, ENABLE); //Timer2????? TIM2_CH2->PB3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; //GPIO 3
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU; //???? ????
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOB, &GPIO_InitStructure);
TIM_TimeBaseStructure.TIM_Period = arr; //???????????????????????????
TIM_TimeBaseStructure.TIM_Prescaler =psc; //??????TIMx???????????
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //??????:TDTS = Tck_tim
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //TIM??????
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); //??TIM_TimeBaseInitStruct?????????TIMx???????
/*???????*/
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM2_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM2_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM2_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM2_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM2_ICInitStructure.TIM_ICFilter = 0x3; //Filter:??
TIM_PWMIConfig(TIM2, &TIM2_ICInitStructure); //PWM????
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2); //???????
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset); //?????????
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);//??????????
TIM_ITConfig(TIM2, TIM_IT_CC2|TIM_IT_Update, ENABLE); //????
TIM_ClearITPendingBit(TIM2, TIM_IT_CC2|TIM_IT_Update); //???????
TIM_Cmd(TIM2, ENABLE);
}
void TIM_UART_Config()
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535/*10000*/; //这个就是自动装载的计数值，由于计数是从0开始的，计数10000次后为9999
TIM_TimeBaseStructure.TIM_Prescaler = 719; // 这个就是预分频系数，当由于为0时表示不分频所以要减1
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //定义在定时器时钟(CK_INT)频率与数字滤波器(ETR,TIx) 使用的采样频率之间的分频比例
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; //向上计数
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure); //初始化定时器2
/* TIM3 通道2 输出模式 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Timing;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Disable;
TIM_OCInitStructure.TIM_Pulse = CCR1_Val;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OC2Init(TIM3, &TIM_OCInitStructure); //配置 通道2
/* TIM3 通道1 捕获比较模式 */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM3, &TIM_ICInitStructure); //配置 通道1
/* TIM3 Input trigger configuration: External Trigger connected to TI1 */
TIM_SelectInputTrigger(TIM3, TIM_TS_TI1FP1);
/* TIM3 configuration in slave reset mode where the timer counter is
re-initialied in response to rising edges on an input capture (TI1) */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
/* Clear TIM3 update pending flag[清除TIM3溢出中断标志] */
TIM_ClearITPendingBit(TIM3, TIM_IT_Update);
/* TIM IT enable */ //打开中断
TIM_ITConfig(TIM3, TIM_IT_CC1, ENABLE);
}
//--------------------------------------------------------------
// interne Funktion
// Init vom Timer
//--------------------------------------------------------------
void P_ICPWM_InitTIM(void)
{
TIM_ICInitTypeDef TIM_ICInitStructure;
// Clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
// Vorteiler einstellen
TIM_PrescalerConfig(TIM2, ICPWM_TIM2_PRESCALE, TIM_PSCReloadMode_Immediate);
if(ICPWM_TIM2.CHANNEL==1) {
// Channel 1
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
// input Trigger
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1);
}
if(ICPWM_TIM2.CHANNEL==2) {
// Channel 2
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
// input Trigger
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
}
// Slave-Mode (Reset)
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM2,TIM_MasterSlaveMode_Enable);
// Timer enable
TIM_Cmd(TIM2, ENABLE);
}
void TIM2_Init(void)
{
TIM_ICInitTypeDef TIM_ICInitStructure;
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICFilter = 0x00;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_PWMIConfig(TIM2,&TIM_ICInitStructure);
TIM_SelectInputTrigger(TIM2,TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
TIM_Cmd(TIM2, ENABLE);
}
/********************************************************************************
* FunctionName: MyTIM1CaptureInit
*
* Description :
*
* Parameters :
*
* Returns :
*******************************************************************************/
void MyTIM1CaptureInit(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1,ENABLE);
TIM_InternalClockConfig(TIM1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/**
* 计数0-0xFFFF，分频71。则周期为1S，溢出一次时间为1uS*0xFFFF=65ms
*/
TIM_TimeBaseInitStructure.TIM_Period = 0xFFFF; // 计数周期
TIM_TimeBaseInitStructure.TIM_Prescaler = 71; // 72MHz / (71+1) = 1000KHz = 1M -->1uS
TIM_TimeBaseInitStructure.TIM_ClockDivision = 0;
TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // 上升计数
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseInitStructure);
TIM_ITConfig(TIM1, TIM_IT_Update, DISABLE); // 禁止溢出中断
TIM_ClearFlag(TIM1, TIM_FLAG_Update);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_1; // 通道1输入捕获
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Falling; // 下降沿触发
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1; // 每次检测到都触发一次捕获
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI; // TI1被连接到IC1
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM1, &TIM_ICInitStructure);
TIM_SelectInputTrigger(TIM1, TIM_TS_TI1FP1); // 选择触发信号
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Reset); // 选中触发信号的下降沿重新初始化计数器并触发寄存器更新
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable); // 使能主从模式
TIM_ITConfig(TIM1, TIM_IT_CC1, DISABLE);
TIM_ClearFlag(TIM1, TIM_FLAG_CC1);
TIM_Cmd(TIM1, ENABLE);
TIM_ITConfig(TIM1, TIM_IT_CC1, ENABLE);
}
void Tim1_cfg1()
{
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
/* TIM3 configuration: PWM Input mode ------------------------
The external signal is connected to TIM4 CH2 pin (PB.07),
The Rising edge is used as active edge,
The TIM4 CCR2 is used to compute the frequency value
The TIM4 CCR1 is used to compute the duty cycle value
------------------------------------------------------------ */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM1, &TIM_ICInitStructure);
TIM_TimeBaseStructure.TIM_Period = 0xFFFF; //周期0～FFFF
TIM_TimeBaseStructure.TIM_Prescaler = 32-1; //时钟分频，分频数为4分频(尽可以测0~2.7ms的脉宽，故仅适用于舵机信号解码)
TIM_TimeBaseStructure.TIM_ClockDivision = 0; //时钟分割
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;//模式
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);//基本初始化
/* Select the TIM3 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM1, TIM_TS_TI2FP2);//设置IC2为中断触发源，这个导致一个定时器只能捕捉1个PWM
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Reset);
/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM1, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM1, TIM_IT_CC2, ENABLE);
}
void us_ticker_init(void) {
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
if (us_ticker_inited) return;
us_ticker_inited = 1;
// Enable Timers clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_TIM1, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM4, ENABLE);
// Time base configuration
// TIM1 is used as "master", "TIM4" as "slave". TIM4 is clocked by TIM1.
TIM_TimeBaseStructure.TIM_Period = 0xFFFF;
TIM_TimeBaseStructure.TIM_Prescaler = (uint16_t)(SystemCoreClock / 1000000) - 1; // 1 µs tick
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
// Master timer configuration
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 0;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
// Slave timer configuration
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR0);
// Enable timers
TIM_Cmd(TIM4, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
void timer2config_gated(void)
{
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
//mesmos tempos da func timer2config
TIM_TimeBaseStructure.TIM_Period=4999;//autoreload de 4999
TIM_TimeBaseStructure.TIM_ClockDivision=TIM_CKD_DIV1; //nao tem divisao de clk
TIM_TimeBaseStructure.TIM_Prescaler=7199; //prescaler de 7199
TIM_TimeBaseStructure.TIM_CounterMode=TIM_CounterMode_Up; //modo de contagem crescente
TIM_TimeBaseInit(TIM2,&TIM_TimeBaseStructure); //Enviar a estrutura preenchida
TIM_ICInitStructure.TIM_Channel=TIM_Channel_1;//o botao está ligado ao canal 1
TIM_ICInitStructure.TIM_ICPolarity=TIM_ICPolarity_Falling;//falling o timer para quando o botão é pressionado, rising o timer só trabalho quando o botão estiver a ser pressionado
TIM_ICInitStructure.TIM_ICSelection=TIM_ICSelection_DirectTI; //TIM Input 1 is selected to be connected to IC1.
TIM_ICInitStructure.TIM_ICPrescaler=TIM_ICPSC_DIV1;//nao há div
TIM_ICInitStructure.TIM_ICFilter=0; // Specifies the Input Capture Filter.
TIM_ICInit(TIM2, &TIM_ICInitStructure);// envia a estrutura da conig
TIM_SelectInputTrigger(TIM2, TIM_TS_TI1FP1); //Filtered Timer Input 1
TIM_SelectSlaveMode(TIM2,TIM_SlaveMode_Gated);//indica o modo do timer no caso, Gated
TIM_Cmd(TIM2, ENABLE);//Ligar timer apos configs
}
void config_tim2( void )
{
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
/* TIM4 Peripheral Configuration ----------------------------------------*/
/* TIM4 Slave Configuration: PWM1 Mode */
TIM_TimeBaseStructInit( &TIM_TimeBaseStructure );
TIM_TimeBaseStructure.TIM_Period = 65535;
// 42 MHz, half of APB1.
TIM_TimeBaseStructure.TIM_Prescaler = PRESCALER;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCStructInit( &TIM_OCInitStructure );
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
/* Slave Mode selection: TIM2 */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
#ifdef GTDEBUG
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable the TIM3 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);
#endif
TIM_Cmd(TIM2, ENABLE);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
/* TIM Configuration */
TIM_Config();
/* --------------------------------------------------------------------------
TIM4 configuration: One Pulse mode
The external signal is connected to TIM4_CH2 pin (PB.07),
The Rising edge is used as active edge,
The One Pulse signal is output on TIM4_CH1 pin (PB.06)
The TIM_Pulse defines the delay value
The (TIM_Period - TIM_Pulse) defines the One Pulse value.
TIM4 input clock (TIM4CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM4CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM4CLK = HCLK / 2 = SystemCoreClock /2
TIM2CLK = SystemCoreClock/2, we want to get TIM2 counter clock at 42 MHz:
Prescaler = (TIM2CLK / TIM2 counter clock) - 1
Prescaler = ((SystemCoreClock /2) /42 MHz) - 1
The Autoreload value is 65535 (TIM4->ARR), so the maximum frequency value
to trigger the TIM4 input is 42000000/65535 = 641 Hz.
The TIM_Pulse defines the delay value, the delay value is fixed
to 390 us:
delay = CCR1/TIM4 counter clock
= 16383 / 42000000 = 390 us.
The (TIM_Period - TIM_Pulse) defines the One Pulse value,
the pulse value is fixed to 1.170 ms:
One Pulse value = (TIM_Period - TIM_Pulse) / TIM4 counter clock
= (65535 - 16383) / 42000000 = 1.170 ms.
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */
/* Compute the prescaler value */
uhPrescalerValue = (uint16_t) ((SystemCoreClock / 2) / 42000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = uhPrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* TIM4 PWM2 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 16383;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
/* TIM4 configuration in Input Capture Mode */
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM4, &TIM_ICInitStructure);
/* One Pulse Mode selection */
TIM_SelectOnePulseMode(TIM4, TIM_OPMode_Single);
/* Input Trigger selection */
TIM_SelectInputTrigger(TIM4, TIM_TS_TI2FP2);
/* Slave Mode selection: Trigger Mode */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Trigger);
while (1)
{
}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
/* TIM1 Configuration */
TIM_Config();
/* ---------------------------------------------------------------------------
TIM1 and Timers(TIM3 and TIM4) synchronisation in parallel mode.
1/TIM1 is configured as Master Timer:
- PWM Mode is used
- The TIM1 Update event is used as Trigger Output
2/TIM3 and TIM4 are slaves for TIM1,
- PWM Mode is used
- The ITR0(TIM1) is used as input trigger for both slaves
- Gated mode is used, so starts and stops of slaves counters
are controlled by the Master trigger output signal(update event).
In this example TIM1 input clock (TIM1CLK) is set to 2 * APB2 clock (PCLK2),
since APB2 prescaler is different from 1.
TIM1CLK = 2 * PCLK2
PCLK2 = HCLK / 2
=> TIM1CLK = HCLK = SystemCoreClock
The TIM1 counter clock is equal to SystemCoreClock = 168 Mhz.
The Master Timer TIM1 is running at:
TIM1 frequency = TIM1 counter clock / (TIM1_Period + 1) = 656 KHz
TIM1_Period = (TIM1 counter clock / TIM1 frequency) - 1 = 255
and the duty cycle is equal to: TIM1_CCR1/(TIM1_ARR + 1) = 50%
The TIM3 is running at:
(TIM1 frequency)/ ((TIM3 period +1)* (Repetition_Counter+1)) = 43.730 KHz and
a duty cycle equal to TIM3_CCR1/(TIM3_ARR + 1) = 33.3%
The TIM4 is running at:
(TIM1 frequency)/ ((TIM4 period +1)* (Repetition_Counter+1)) = 65.600 KHz and
a duty cycle equal to TIM4_CCR1/(TIM4_ARR + 1) = 50%
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */
/* TIM3 Peripheral Configuration ----------------------------------------*/
/* TIM3 Slave Configuration: PWM1 Mode */
TIM_TimeBaseStructure.TIM_Period = 2;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0);
/* TIM4 Peripheral Configuration ----------------------------------------*/
/* TIM4 Slave Configuration: PWM1 Mode */
TIM_TimeBaseStructure.TIM_Period = 1;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
/* Slave Mode selection: TIM4 */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR0);
/* TIM1 Peripheral Configuration ----------------------------------------*/
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 255;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 4;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Channel 1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 127;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 5;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
/* TIM1 counter enable */
TIM_Cmd(TIM1, ENABLE);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM4, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while (1)
{}
}
/**
* @brief Configure the TIM IRQ Handler.
* @param None
* @retval None
*/
static void TIM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
/* TIM2 clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOB clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* TIM2 chennel2 configuration : PB.03 */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/* Connect TIM pin to AF2 */
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_2);
/* Enable the TIM2 global Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* ---------------------------------------------------------------------------
TIM2 configuration: PWM Input mode
The external signal is connected to TIM2 CH2 pin (PB.03)
TIM2 CCR2 is used to compute the frequency value
TIM2 CCR1 is used to compute the duty cycle value
In this example TIM2 input clock (TIM2CLK) is set to APB1 clock (PCLK1), since
APB1 prescaler is set to 1.
TIM2CLK = PCLK1 = HCLK = SystemCoreClock
External Signal Frequency = SystemCoreClock / TIM2_CCR2 in Hz.
External Signal DutyCycle = (TIM2_CCR1*100)/(TIM2_CCR2) in %.
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f0xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
/* Select the TIM2 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM2,TIM_MasterSlaveMode_Enable);
/* TIM enable counter */
TIM_Cmd(TIM2, ENABLE);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* System Clocks Configuration */
RCC_Configuration();
/* Configure the GPIO ports */
GPIO_Configuration();
/* Timers synchronisation in cascade mode with an external trigger -----
1/TIM1 is configured as Master Timer:
- Toggle Mode is used
- The TIM1 Enable event is used as Trigger Output
2/TIM1 is configured as Slave Timer for an external Trigger connected
to TIM1 TI2 pin (TIM1 CH2 configured as input pin):
- The TIM1 TI2FP2 is used as Trigger Input
- Rising edge is used to start and stop the TIM1: Gated Mode.
3/TIM3 is slave for TIM1 and Master for TIM4,
- Toggle Mode is used
- The ITR1(TIM1) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM1 enable event).
- The TIM3 enable event is used as Trigger Output.
4/TIM4 is slave for TIM3,
- Toggle Mode is used
- The ITR2(TIM3) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM3 enable event).
* For Low-density, Medium-density, High-density and Connectivity line devices:
The TIMxCLK is fixed to 72 MHZ, the Prescaler is equal to 2 so the TIMx clock
counter is equal to 24 MHz.
The Three Timers are running at:
TIMx frequency = TIMx clock counter/ 2*(TIMx_Period + 1) = 162.1 KHz.
* For Low-Density Value line and Medium-Density Value line devices:
The TIMxCLK is fixed to 24 MHz, the Prescaler is equal to 2 so the TIMx clock
counter is equal to 8 MHz.
TIMx frequency = TIMx clock counter/ 2*(TIMx_Period + 1) = 54 KHz.
The starts and stops of the TIM1 counters are controlled by the
external trigger.
The TIM3 starts and stops are controlled by the TIM1, and the TIM4
starts and stops are controlled by the TIM3.
-------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 73;
TIM_TimeBaseStructure.TIM_Prescaler = 2;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 73;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 73;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* Master Configuration in Toggle Mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 64;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* TIM1 Input Capture Configuration */
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM1, &TIM_ICInitStructure);
/* TIM1 Input trigger configuration: External Trigger connected to TI2 */
TIM_SelectInputTrigger(TIM1, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM1, TIM_SlaveMode_Gated);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
/* Master Mode selection: TIM1 */
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Enable);
/* Slaves Configuration: Toggle Mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Toggle;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0);
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* Master Mode selection: TIM3 */
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Enable);
/* Slave Mode selection: TIM4 */
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2);
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
/* TIM1 Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
/* TIM enable counter */
TIM_Cmd(TIM1, ENABLE);
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM4, ENABLE);
while (1)
{}
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40_41xxx.s/startup_stm32f427_437xx.s/startup_stm32f429_439xx.s)
before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
/* TIM2/3/4 Configuration */
TIM_Config();
/* Timers synchronisation in cascade mode ------------------------------------
1/TIM2 is configured as Master Timer:
- PWM Mode is used
- The TIM2 Update event is used as Trigger Output
2/TIM3 is slave for TIM2 and Master for TIM4,
- PWM Mode is used
- The ITR1(TIM2) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM2 update event).
- The TIM3 Update event is used as Trigger Output.
3/TIM4 is slave for TIM3,
- PWM Mode is used
- The ITR2(TIM3) is used as input trigger
- Gated mode is used, so start and stop of slave counter
are controlled by the Master trigger output signal(TIM3 update event).
In this example TIM2 input clock (TIM2CLK) is set to 2 * APB1 clock (PCLK1),
since APB1 prescaler is different from 1.
TIM2CLK = 2 * PCLK1
PCLK1 = HCLK / 4
=> TIM2CLK = HCLK / 2 = SystemCoreClock /2
The Master Timer TIM2 is running at TIM2 counter clock:
TIM2 frequency = (TIM2 counter clock)/ (TIM2 period + 1) = 328.125 KHz
and the duty cycle = TIM2_CCR1/(TIM2_ARR + 1) = 25%.
The TIM3 is running:
- At (TIM2 frequency)/ (TIM3 period + 1) = 82.02 KHz and a duty cycle
equal to TIM3_CCR1/(TIM3_ARR + 1) = 25%
The TIM4 is running:
- At (TIM3 frequency)/ (TIM4 period + 1) = 20.5 KHz and a duty cycle
equal to TIM4_CCR1/(TIM4_ARR + 1) = 25%
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f4xx.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 255;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 3;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_TimeBaseStructure.TIM_Period = 3;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
/* Master Configuration in PWM1 Mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 64;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM2, TIM_TRGOSource_Update);
/* Slaves Configuration: PWM1 Mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR1);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
/* Master Mode selection: TIM3 */
TIM_SelectOutputTrigger(TIM3, TIM_TRGOSource_Update);
/* Slave Mode selection: TIM4 */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR2);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM2, ENABLE);
TIM_Cmd(TIM4, ENABLE);
while (1)
{
}
}
void TIMER_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef nvic;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
u32 TimerPeriod = 0;
u16 Channel1Pulse = 0, Channel2Pulse = 0, Channel3Pulse = 0;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/*
SVGA 800x600 @ 56 Hz
Vertical refresh 35.15625 kHz
Pixel freq. 36.0 MHz
1 system tick @ 72Mhz = 0,0138 us
*/
/*
Horizontal timing
-----------------
Timer 1 period = 35156 Hz
Timer 1 channel 1 generates a pulse for HSYNC each 28.4 us.
28.4 us = Visible area + Front porch + Sync pulse + Back porch.
HSYNC is 2 us long, so the math to do is:
2us / 0,0138us = 144 system ticks.
Timer 1 channel 2 generates a pulse equal to HSYNC + back porch.
This interrupt will fire the DMA request to draw on the screen if vflag == 1.
Since firing the DMA takes more or less 800ns, we'll add some extra time.
The math for HSYNC + back porch is:
(2us + 3,55us - dma) / 0,0138us = +-350 system ticks
Horizontal timing info
----------------------
Dots us
--------------------------------------------
Visible area 800 22.222222222222
Front porch 24 0.66666666666667
Sync pulse 72 2
Back porch 128 3.5555555555556
Whole line 1024 28.444444444444
*/
TimerPeriod = 2048;
Channel1Pulse = 144; /* HSYNC */
Channel2Pulse = 352; /* HSYNC + BACK PORCH */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = Channel1Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive;
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OC2Init(TIM1, &TIM_OCInitStructure);
/* TIM1 counter enable and output enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
/* Select TIM1 as Master */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
/*
Vertical timing
---------------
Polarity of vertical sync pulse is positive.
Lines
------------------------------
Visible area 600
Front porch 1
Sync pulse 2
Back porch 22
Whole frame 625
*/
/* VSYNC (TIM2_CH2) and VSYNC_BACKPORCH (TIM2_CH3) */
/* Channel 2 and 3 Configuration in PWM mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM2, TIM_TS_ITR0);
TimerPeriod = 625; /* Vertical lines */
Channel2Pulse = 2; /* Sync pulse */
Channel3Pulse = 24; /* Sync pulse + Back porch */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = TimerPeriod;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 0;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = Channel2Pulse;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_High;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Reset;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Set;
TIM_OC2Init(TIM2, &TIM_OCInitStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_Inactive;
TIM_OCInitStructure.TIM_Pulse = Channel3Pulse;
TIM_OC3Init(TIM2, &TIM_OCInitStructure);
/* TIM2 counter enable and output enable */
TIM_CtrlPWMOutputs(TIM2, ENABLE);
/* Interrupt TIM2 */
nvic.NVIC_IRQChannel = TIM2_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 1;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic);
TIM_ITConfig(TIM2, TIM_IT_CC3, ENABLE);
/* Interrupt TIM1 */
nvic.NVIC_IRQChannel = TIM1_CC_IRQn;
nvic.NVIC_IRQChannelPreemptionPriority = 1;
nvic.NVIC_IRQChannelSubPriority = 0;
nvic.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&nvic);
TIM_ITConfig(TIM1, TIM_IT_CC2, ENABLE);
TIM_Cmd(TIM2, ENABLE);
TIM_Cmd(TIM1, ENABLE);
}
/**
* @brief Calibration of External crystal oscillator auto(through Timer
*
* @param None
* @retval : None
*/
void AutoClockCalibration(void)
{
RCC_ClocksTypeDef ClockValue;
uint16_t TimerPrescalerValue=0x0003;
uint16_t CountWait;
uint16_t DeviationInteger;
uint32_t CalibrationTimer;
float f32_Deviation;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_DeInit(TIM2);
BKP_TamperPinCmd(DISABLE);
BKP_RTCOutputConfig(BKP_RTCOutputSource_CalibClock);
/* TIM2 configuration: PWM Input mode ------------------------
The external signal is connected to TIM2 CH2 pin (PA.01),
The Rising edge is used as active edge,
The TIM2 CCR2 is used to compute the frequency value
The TIM2 CCR1 is used to compute the duty cycle value
------------------------------------------------------------ */
TIM_PrescalerConfig(TIM2,TimerPrescalerValue,TIM_PSCReloadMode_Immediate);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x00;
TIM_PWMIConfig(TIM2, &TIM_ICInitStructure);
TIM_ICInit(TIM2, &TIM_ICInitStructure);
/* Select the TIM2 Input Trigger: TI2FP2 */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
/* Select the slave Mode: Reset Mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Reset);
/* Enable the Master/Slave Mode */
TIM_SelectMasterSlaveMode(TIM2, TIM_MasterSlaveMode_Enable);
/* TIM enable Counter */
TIM_Cmd(TIM2, ENABLE);
LCD_Clear(Blue2);
LCD_DisplayString(Line4,Column1,"Please Wait.....");
/* Wait for 2 seconds */
CalibrationTimer = RTC_GetCounter();
while((RTC_GetCounter() - CalibrationTimer) < 2)
{
}
RCC_GetClocksFreq(&ClockValue);
TimerFrequency=(ClockValue.PCLK1_Frequency * 2)/(TimerPrescalerValue+1);
/* Enable the CC2 Interrupt Request */
TIM_ITConfig(TIM2, TIM_IT_CC2, ENABLE);
/* Wait for 2 seconds */
CalibrationTimer = RTC_GetCounter();
while((RTC_GetCounter() - CalibrationTimer) < 2)
{
}
if(!(TIM_GetFlagStatus(TIM2, TIM_FLAG_CC1)))
/* There is no signal at the timer TIM2 peripheral input */
{
LCD_Clear(Blue2);
LCD_DisplayString(Line3,Column0,"Please connect wire");
LCD_DisplayString(Line4,Column0,"link between PC13");
LCD_DisplayString(Line5,Column0,"and PA1");
LCD_DisplayString(Line7,Column0,"No calibration done");
}
else
{
/* Calulate Deviation in ppm using the formula :
Deviation in ppm = (Deviation from 511.968/511.968)*1 million*/
if(f32_Frequency > 511.968)
{
f32_Deviation=((f32_Frequency-511.968)/511.968)*1000000;
}
else
{
f32_Deviation=((511.968-f32_Frequency)/511.968)*1000000;
}
DeviationInteger = (uint16_t)f32_Deviation;
if(f32_Deviation >= (DeviationInteger + 0.5))
{
DeviationInteger = ((uint16_t)f32_Deviation)+1;
}
CountWait=0;
/* Frequency deviation in ppm should be les than equal to 121 ppm*/
if(DeviationInteger <= 121)
{
while(CountWait<128)
{
if(CalibrationPpm[CountWait] == DeviationInteger)
break;
CountWait++;
}
BKP_SetRTCCalibrationValue(CountWait);
LCD_Clear(Blue2);
LCD_DisplayString(Line4,Column1,"Calibration Value");
LCD_DisplayChar(Line5,Column10,(CountWait%10)+0x30);
CountWait=CountWait/10;
LCD_DisplayChar(Line5,Column9,(CountWait%10)+0x30);
CountWait=CountWait/10;
if(CountWait>0)
{
LCD_DisplayChar(Line5,Column8,(CountWait%10)+0x30);
}
}
else /* Frequency deviation in ppm is more than 121 ppm, hence calibration
can not be done */
{
LCD_Clear(Blue2);
LCD_DisplayString(Line3,Column1,"Out Of Calibration");
LCD_DisplayString(Line4,Column4,"Range");
}
}
BKP_RTCOutputConfig(BKP_RTCOutputSource_None);
TIM_ITConfig(TIM2, TIM_IT_CC2, DISABLE);
TIM_Cmd(TIM2, DISABLE);
TIM_DeInit(TIM2);
CalibrationTimer=RTC_GetCounter();
/* Wait for 2 seconds */
while((RTC_GetCounter() - CalibrationTimer) < 5)
{
}
MenuInit();
}
/**
* @brief Configure the TIM2.
* @param None
* @retval None
*/
static void TIM_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_OCInitTypeDef TIM_OCInitStructure;
uint16_t PrescalerValue = 0;
/* TIM clock enable */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
/* GPIOA clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
/* TIM2_CH1 pin (PA.00) and TIM2_CH2 pin (PA.01) configuration */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Connect TIM pins to AF1 */
GPIO_PinAFConfig(GPIOA, GPIO_PinSource0, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource1, GPIO_AF_1);
/* --------------------------------------------------------------------------
TIM2 configuration: One Pulse mode
The external signal is connected to TIM2_CH2 pin (PA.01),
The Rising edge is used as active edge,
The One Pulse signal is output on TIM2_CH1 pin (PA.00)
The TIM_Pulse defines the delay value
The (TIM_Period - TIM_Pulse) defines the One Pulse value.
TIM2 input clock (TIM2CLK) is set to 2*APB1 clock (PCLK1)
TIM2CLK = 2*PCLK1
PCLK1 = HCLK
=> TIM2CLK = HCLK = SystemCoreClock
TIM2CLK = SystemCoreClock, we want to get TIM2 counter clock at 36 MHz:
Prescaler = (TIM2CLK / TIM2 counter clock) - 1
Prescaler = (SystemCoreClock /36 MHz) - 1
The Autoreload value is 65535 (TIM2->ARR), so the maximum frequency value
to trigger the TIM2 input is 36000000/65535 = 549.3 Hz.
The TIM_Pulse defines the delay value, the delay value is fixed
to 455.1 us:
delay = CCR1/TIM2 counter clock = 455.1 us.
The (TIM_Period - TIM_Pulse) defines the One Pulse value,
the pulse value is fixed to 1.36 ms:
One Pulse value = (TIM_Period - TIM_Pulse) / TIM2 counter clock = 1.36 ms.
Note:
SystemCoreClock variable holds HCLK frequency and is defined in system_stm32f30x.c file.
Each time the core clock (HCLK) changes, user had to call SystemCoreClockUpdate()
function to update SystemCoreClock variable value. Otherwise, any configuration
based on this variable will be incorrect.
--------------------------------------------------------------------------- */
/* Compute the prescaler value */
PrescalerValue = (uint16_t) ((SystemCoreClock ) / 36000000) - 1;
/* Time base configuration */
TIM_TimeBaseStructure.TIM_Period = 65535;
TIM_TimeBaseStructure.TIM_Prescaler = PrescalerValue;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
/* Init TIM_OCInitStructure */
TIM_OCStructInit(&TIM_OCInitStructure);
/* TIM2 PWM2 Mode configuration: Channel1 */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 16383;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High;
TIM_OC1Init(TIM2, &TIM_OCInitStructure);
/* TIM configuration in Input Capture Mode */
TIM_ICStructInit(&TIM_ICInitStructure);
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising;
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0;
TIM_ICInit(TIM2, &TIM_ICInitStructure);
/* One Pulse Mode selection */
TIM_SelectOnePulseMode(TIM2, TIM_OPMode_Single);
/* Input Trigger selection */
TIM_SelectInputTrigger(TIM2, TIM_TS_TI2FP2);
/* Slave Mode selection: Trigger Mode */
TIM_SelectSlaveMode(TIM2, TIM_SlaveMode_Trigger);
}
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
file (startup_stm32f10x_xx.s) before to branch to application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f10x.c file
*/
/* System Clocks Configuration */
RCC_Configuration();
/* GPIO Configuration */
GPIO_Configuration();
/* TIM1 and Timers(TIM3 and TIM4) synchronisation in parallel mode -----------
1/TIM1 is configured as Master Timer:
- PWM Mode is used
- The TIM1 Update event is used as Trigger Output
2/TIM3 and TIM4 are slaves for TIM1,
- PWM Mode is used
- The ITR0(TIM1) is used as input trigger for both slaves
- Gated mode is used, so starts and stops of slaves counters
are controlled by the Master trigger output signal(update event).
o For Low-density, Medium-density, High-density and Connectivity line devices:
The TIMxCLK is fixed to 72 MHz, Prescaler = 0 so the TIM1 counter clock is 72 MHz.
The Master Timer TIM1 is running at:
TIM1 frequency = TIM1 counter clock / (TIM1_Period + 1) = 281.250 KHz
and the duty cycle is equal to: TIM1_CCR1/(TIM1_ARR + 1) = 50%
The TIM3 is running at:
(TIM1 frequency)/ ((TIM3 period +1)* (Repetion_Counter+1)) = 18.750 KHz and
a duty cycle equal to TIM3_CCR1/(TIM3_ARR + 1) = 33.3%
The TIM4 is running at:
(TIM1 frequency)/ ((TIM4 period +1)* (Repetion_Counter+1)) = 28.125 KHz and
a duty cycle equal to TIM4_CCR1/(TIM4_ARR + 1) = 50%
o For Low-Density Value line and Medium-Density Value line devices:
The TIMxCLK is fixed to 24 MHz, Prescaler = 0 so the TIM1 counter clock is 24 MHz.
TIM1 frequency = 93.75 KHz
TIM3 frequency = 6.25 KHz
TIM4 frequency = 9.375 KHz
--------------------------------------------------------------------------- */
/* TIM3 Peripheral Configuration ----------------------------------------*/
/* TIM3 Slave Configuration: PWM1 Mode */
TIM_TimeBaseStructure.TIM_Period = 2;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM3, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OC1Init(TIM3, &TIM_OCInitStructure);
/* Slave Mode selection: TIM3 */
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM3, TIM_TS_ITR0);
/* TIM4 Peripheral Configuration ----------------------------------------*/
/* TIM4 Slave Configuration: PWM1 Mode */
TIM_TimeBaseStructure.TIM_Period = 1;
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseInit(TIM4, &TIM_TimeBaseStructure);
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_Pulse = 1;
TIM_OC1Init(TIM4, &TIM_OCInitStructure);
/* Slave Mode selection: TIM4 */
TIM_SelectSlaveMode(TIM4, TIM_SlaveMode_Gated);
TIM_SelectInputTrigger(TIM4, TIM_TS_ITR0);
/* TIM1 Peripheral Configuration ----------------------------------------*/
/* Time Base configuration */
TIM_TimeBaseStructure.TIM_Prescaler = 0;
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_Period = 255;
TIM_TimeBaseStructure.TIM_ClockDivision = 0;
TIM_TimeBaseStructure.TIM_RepetitionCounter = 4;
TIM_TimeBaseInit(TIM1, &TIM_TimeBaseStructure);
/* Channel 1 Configuration in PWM mode */
TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM2;
TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable;
TIM_OCInitStructure.TIM_OutputNState = TIM_OutputNState_Enable;
TIM_OCInitStructure.TIM_Pulse = 127;
TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_Low;
TIM_OCInitStructure.TIM_OCNPolarity = TIM_OCNPolarity_Low;
TIM_OCInitStructure.TIM_OCIdleState = TIM_OCIdleState_Set;
TIM_OCInitStructure.TIM_OCNIdleState = TIM_OCIdleState_Reset;
TIM_OC1Init(TIM1, &TIM_OCInitStructure);
/* Automatic Output enable, Break, dead time and lock configuration*/
TIM_BDTRInitStructure.TIM_OSSRState = TIM_OSSRState_Enable;
TIM_BDTRInitStructure.TIM_OSSIState = TIM_OSSIState_Enable;
TIM_BDTRInitStructure.TIM_LOCKLevel = TIM_LOCKLevel_1;
TIM_BDTRInitStructure.TIM_DeadTime = 5;
TIM_BDTRInitStructure.TIM_Break = TIM_Break_Disable;
TIM_BDTRInitStructure.TIM_BreakPolarity = TIM_BreakPolarity_High;
TIM_BDTRInitStructure.TIM_AutomaticOutput = TIM_AutomaticOutput_Disable;
TIM_BDTRConfig(TIM1, &TIM_BDTRInitStructure);
/* Master Mode selection */
TIM_SelectOutputTrigger(TIM1, TIM_TRGOSource_Update);
/* Select the Master Slave Mode */
TIM_SelectMasterSlaveMode(TIM1, TIM_MasterSlaveMode_Enable);
/* TIM1 counter enable */
TIM_Cmd(TIM1, ENABLE);
/* TIM enable counter */
TIM_Cmd(TIM3, ENABLE);
TIM_Cmd(TIM4, ENABLE);
/* Main Output Enable */
TIM_CtrlPWMOutputs(TIM1, ENABLE);
while (1)
{}
}
