/**
* @brief Configures the TIM3 Trigger as External Clock.
* @param TIM3_TIxExternalCLKSource : Specifies Trigger source.
* This parameter can be one of the @ref TIM3_TIxExternalCLK1Source_TypeDef enumeration.
* @param TIM3_ICPolarity : Specifies the TIx Polarity.
* This parameter can be @ref TIM3_ICPolarity_TypeDef enumeration.
* @param ICFilter : Specifies the filter value.
* This parameter must be a value between 0x00 and 0x0F
* @retval None
*/
void TIM3_TIxExternalClockConfig(TIM3_TIxExternalCLK1Source_TypeDef TIM3_TIxExternalCLKSource,
TIM3_ICPolarity_TypeDef TIM3_ICPolarity,
uint8_t ICFilter)
{
/* Check the parameters */
assert_param(IS_TIM3_TIXCLK_SOURCE(TIM3_TIxExternalCLKSource));
assert_param(IS_TIM3_IC_POLARITY(TIM3_ICPolarity));
assert_param(IS_TIM3_IC_FILTER(ICFilter));
/* Configure the TIM3 Input Clock Source */
if (TIM3_TIxExternalCLKSource == TIM3_TIxExternalCLK1Source_TI2)
{
TI2_Config(TIM3_ICPolarity, TIM3_ICSelection_DirectTI, ICFilter);
}
else
{
TI1_Config(TIM3_ICPolarity, TIM3_ICSelection_DirectTI, ICFilter);
}
/* Select the Trigger source */
TIM3_SelectInputTrigger((TIM3_TRGSelection_TypeDef)TIM3_TIxExternalCLKSource);
/* Select the External clock mode1 */
TIM3->SMCR |= (uint8_t)(TIM3_SlaveMode_External1);
}
void Config()
{
//System clock at power up is HSI/8 = 16MHz/8 = 2MHz
//CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1); //set HSI/4 = 4MHz SysClk to Core and Memory, minimum clock = 125KHz for CLK_SYSCLKDiv_128
//PWR_PVDCmd(ENABLE); //Power voltage detector and brownout Reset unit supply current 2,6uA
//PWR_PVDLevelConfig(PWR_PVDLevel_2V26); //set Programmable voltage detector threshold to 2,26V
//PWR_GetFlagStatus(PWR_FLAG_PVDOF); //checks whether the specified PWR flag is set or not
//Configure external interrupts - BTN1 and BTN2 presses
//EXTI_SetPinSensitivity(EXTI_Pin_2, EXTI_Trigger_Falling_Low);
//EXTI_SetPinSensitivity(EXTI_Pin_4, EXTI_Trigger_Falling_Low);
//EXTI_SelectPort(EXTI_Port_B);
//EXTI_SetHalfPortSelection(EXTI_HalfPort_B_MSB, ENABLE);
// Timer 4 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM4, ENABLE); // 8bit: used for system periodic flags and timeouts
TIM4_TimeBaseInit(TIM4_Prescaler_16, 125); // Overflow at 1ms, 2MHz/16/125 = 1000
TIM4_ITConfig(TIM4_IT_Update, ENABLE);
TIM4_Cmd(ENABLE);
// Timer 2 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM2, ENABLE); // 16bit: used for runtime measurement
TIM2_TimeBaseInit(TIM2_Prescaler_2, TIM2_CounterMode_Up, 0xFFFF); // timebase of 1us, 2MHz/2=1M
TIM2_Cmd(ENABLE);
// Timer3 Configuration
CLK_PeripheralClockConfig(CLK_Peripheral_TIM3, ENABLE);
TIM3_TimeBaseInit(TIM3_Prescaler_2, TIM3_CounterMode_Up, 0xFFFF); // 1us timebase @ 2MHz system clock
TIM3_ICInit(TIM3_Channel_2,
TIM3_ICPolarity_Falling,
TIM3_ICSelection_IndirectTI,
TIM3_ICPSC_Div1,
0);
TIM3_ICInit(TIM3_Channel_1,
TIM3_ICPolarity_Rising,
TIM3_ICSelection_DirectTI,
TIM3_ICPSC_Div1,
0);
TIM3_SelectInputTrigger(TIM3_TRGSelection_TI1FP1);
TIM3_SelectSlaveMode(TIM3_SlaveMode_Reset); // Reset timer on selected trigger signal
TIM3_ITConfig(TIM3_IT_CC1, ENABLE);
TIM3_ITConfig(TIM3_IT_CC2, ENABLE);
TIM3_Cmd(ENABLE);
/* Output PP High - bicolor LED to GND */
GPIO_Init(LED_PORT, LED_PIN1, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(LED_PORT, LED_PIN2, GPIO_Mode_Out_PP_Low_Slow);
/* Input pull up no IT - onboard Button, external pull-up */
GPIO_Init(BTN1_PORT, BTN1_PIN, GPIO_Mode_In_FL_No_IT);
/* RFM85W pins */
GPIO_Init(RFM_DATA_PORT, RFM_DATA_PIN, GPIO_Mode_In_FL_No_IT);
/* DEBUG pin */
GPIO_Init(DEBUG_PIN_PORT, DEBUG_PIN_PIN, GPIO_Mode_Out_PP_Low_Fast);
/* H bridge outputs */
GPIO_Init(PMOS_L_PORT, PMOS_L_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(PMOS_R_PORT, PMOS_R_PIN, GPIO_Mode_Out_PP_High_Fast);
GPIO_Init(NMOS_L_PORT, NMOS_L_PIN, GPIO_Mode_Out_PP_Low_Fast);
GPIO_Init(NMOS_R_PORT, NMOS_R_PIN, GPIO_Mode_Out_PP_Low_Fast);
}
/**
* @brief Configure TIM1,2,3 peripherals
* @param None
* @retval None
*/
static void TIM_Config(void)
{
/* TIM1 configuration:
- TIM1CLK is set to 2 MHz, the TIM2 Prescaler is equal to 15 so the TIM1 counter
clock used is 2 MHz / (15 + 1) = 125 000 Hz
- TIM1 Channel 1 output frequency = TIM1CLK / (TIM1_PERIOD + 1) * (TIM1_PRESCALER + 1)
= 2 000 000 / 256 * 16 = 488.28 Hz */
/* Time Base configuration */
TIM1_TimeBaseInit(TIM1_PRESCALER, TIM1_CounterMode_Up, TIM1_PERIOD, TIM1_REPETITION_COUNTER);
/* TIM1 Channel 1 Configuration in PWM2 mode */
TIM1_OC1Init(TIM1_OCMode_PWM2, TIM1_OutputState_Enable, TIM1_OutputNState_Disable, TIM1_CCR1_VAL,
TIM1_OCPolarity_Low, TIM1_OCNPolarity_Low, TIM1_OCIdleState_Set, TIM1_OCNIdleState_Set);
/* Master Mode selection: Update event */
TIM1_SelectOutputTrigger(TIM1_TRGOSource_Update);
/* TIM2 configuration:
- TIM2 is connected to TIM1 Update so TIM2CLK is equal to
TIM1 output clock / (TIM1_REPETITION_COUNTER + 1) = 488.28 / 5 = 97.65 Hz
- TIM2 Prescaler is equal to 1 so the TIM2 counter clock used is 97.65 / 1 = 97.65 Hz
- TIM2 Channel 1 output frequency = TIM2CLK / (TIM2_PERIOD + 1) * TIM2_Prescaler
= 97.65 / 3 * 1 = 32.55 Hz */
/* Time Base configuration */
TIM2_TimeBaseInit(TIM2_Prescaler_1, TIM2_CounterMode_Up, TIM2_PERIOD);
TIM2_OC1Init(TIM2_OCMode_PWM2, TIM2_OutputState_Enable, TIM2_CCR1_VAL,
TIM2_OCPolarity_Low, TIM2_OCIdleState_Reset);
/* TIM2 Slave Mode selection: Gated mode */
TIM2_SelectSlaveMode(TIM2_SlaveMode_Gated);
TIM2_SelectInputTrigger(TIM2_TRGSelection_TIM1);
/* TIM3 configuration:
- TIM3 is connected to TIM1 Update so TIM3CLK is equal to
TIM1 output clock / (TIM1_REPETITION_COUNTER + 1) = 488.28 / 5 = 97.65 Hz
- TIM3 Prescaler is equal to 1 so the TIM3 counter clock used is 97.65 / 1 = 97.65 Hz
- TIM3 Channel 1 output frequency = TIM3CLK / (TIM3_PERIOD + 1) * TIM3Prescaler
= 97.65 / 4 * 1 = 24.41 Hz */
/* Time Base configuration */
TIM3_TimeBaseInit(TIM3_Prescaler_1, TIM3_CounterMode_Up, TIM3_PERIOD);
TIM3_OC1Init(TIM3_OCMode_PWM2, TIM3_OutputState_Enable, TIM3_CCR1_VAL,
TIM3_OCPolarity_Low, TIM3_OCIdleState_Reset);
/* TIM3 Slave Mode selection: Gated mode */
TIM3_SelectSlaveMode(TIM3_SlaveMode_Gated);
TIM3_SelectInputTrigger(TIM3_TRGSelection_TIM1);
/* Main Output Enable */
TIM1_CtrlPWMOutputs(ENABLE);
TIM2_CtrlPWMOutputs(ENABLE);
TIM3_CtrlPWMOutputs(ENABLE);
/* TIM2 counter enable */
TIM2_Cmd(ENABLE);
/* TIM3 counter enable */
TIM3_Cmd(ENABLE);
/* TIM1 counter enable */
TIM1_Cmd(ENABLE);
}
