static void TIM2_Config(void)
{
/* Enable TIM2 CLK */
CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE);
/* Capture only every 8 events!!! */
/* Enable capture of TIM2 */
TIM2_ICInit(TIM2_Channel_1, TIM2_ICPolarity_Falling, TIM2_ICSelection_DirectTI, TIM2_ICPSC_Div8, 0);
/* Enable timer1 */
TIM2_Cmd(ENABLE);
/* Config Channel 1 pin*/
GPIO_Init(GPIOB, GPIO_Pin_0, GPIO_Mode_In_PU_No_IT);
/* Clear CC1 Flag*/
TIM2_ClearFlag(TIM2_FLAG_CC1);
/* wait a Capture on CC1 */
while((TIM2->SR1 & TIM2_FLAG_CC1) != TIM2_FLAG_CC1);
/* Get CCR1 value*/
ICValue1 = TIM2_GetCapture1();
/* Clear CC1 Flag*/
TIM2_ClearFlag(TIM2_FLAG_CC1);
/* wait a capture on cc1 */
while((TIM2->SR1 & TIM2_FLAG_CC1) != TIM2_FLAG_CC1);
/* Get CCR1 value*/
ICValue2 = TIM2_GetCapture1();
TIM2_ClearFlag(TIM2_FLAG_CC1);
}
void MOD_TIM_Config(Mod_Master_Frame_TypeDef* aFrame)
{
TIM2_DeInit();
TIM2_TimeBaseInit(0x0F, 1500); //2ms comm response time
TIM2_UpdateRequestConfig(TIM2_UPDATESOURCE_REGULAR);
TIM2_GenerateEvent(TIM2_EVENTSOURCE_UPDATE);
TIM2_Cmd(DISABLE);
TIM2_ClearITPendingBit(TIM2_IT_UPDATE);
TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
TIM4_DeInit();
TIM4_TimeBaseInit(0x07, 126); //128 * 126 = 16128 = 2ms (8MHz), frame check
TIM4_UpdateRequestConfig(TIM4_UPDATESOURCE_REGULAR);
TIM4_GenerateEvent(TIM4_EVENTSOURCE_UPDATE);
TIM4_Cmd(DISABLE);
TIM4_ClearITPendingBit(TIM4_IT_UPDATE);
TIM4_ITConfig(TIM4_IT_UPDATE, ENABLE);
TIM4_ClearFlag(TIM4_FLAG_UPDATE);
}
inline void
vMBPortTimersEnable( )
{
/* Enable the timer with the timeout passed to xMBPortTimersInit( ) */
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
TIM2_SetCounter(0x00);
TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
TIM2_Cmd(ENABLE);
}
void timerInit(void)
{
/* TIM2 initial */
TIM2_TimeBaseInit(TIM2_PRESCALER_16,7812);
TIM2_ITConfig( TIM2_IT_UPDATE , ENABLE);
TIM2_SetCounter(0x0000);
/*计时器打开*/
TIM2_Cmd(ENABLE);
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
}
void __delay_us(uint16_t delay)
{
delay = delay * 16;
uint16_t count = 0;
TIM2_ARRPreloadConfig(DISABLE);
TIM2_SetAutoreload(delay);
TIM2_SetCounter(0);
TIM2_Cmd(ENABLE);
while(TIM2_GetFlagStatus(TIM2_FLAG_Update) == RESET);
TIM2_ClearFlag(TIM2_FLAG_Update);
TIM2_Cmd(DISABLE);
}
/* Private functions ---------------------------------------------------------*/
void TIM2_Config(void)
{
/* Time base configuration */
TIM2_TimeBaseInit(TIM2_Prescaler_1,TIM2_CounterMode_Up, 1);
/* Clear TIM1 update flag */
TIM2_ClearFlag(TIM2_FLAG_Update);
/* Enable update interrupt */
TIM2_ITConfig(TIM2_IT_Update, ENABLE);
/* Enable TIM2 */
TIM2_Cmd(ENABLE);
}
/* ----------------------- Start implementation -----------------------------*/
BOOL
xMBPortTimersInit( USHORT usTim1Timerout50us )
{
ENTER_CRITICAL_SECTION();
// f_master = 16 MHz
// TIM2 counter clock = f_master / Prescaler = 0.5 MHz
// 1 step = 2 us
// maximum timeout = 2us * 65535 = 130ms
TIM2_DeInit();
TIM2_TimeBaseInit(TIM2_PRESCALER_32, 25 * usTim1Timerout50us);
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
EXIT_CRITICAL_SECTION();
return TRUE;
}
void TIM2_Config(void)
{
/* TIM2 configuration:
- TIM2CLK is set to 16 MHz, the TIM2 Prescaler is equal to 128 so the TIM2 counter
clock used is 16 MHz / 512 = 31250 Hz
- In this example we need to generate a time base equal to 500 ms
so TIM2_PERIOD = (0.5 * 312500 - 1) = 15624 */
/* Time base configuration */
TIM2_TimeBaseInit(TIM2_PRESCALER_512, TIM2_PERIOD);
TIM2_ARRPreloadConfig(ENABLE);
TIM2_ClearFlag(TIM2_FLAG_UPDATE);
/* Enable update interrupt */
TIM2_ITConfig(TIM2_IT_UPDATE, ENABLE);
/* Enable TIM2 */
TIM2_Cmd(ENABLE);
}
