Posted on October 14, 2016 at 10:49I do something like this, it is proper way to read pwm signal from encoder?
void TIMERS_Configuration(void) {
TIM_ICInitTypeDef TIM_ICInitStructure;
TIM_ICInitStructure.TIM_Channel = TIM_Channel_2;
TIM_ICInitStructure.TIM_ICPolarity = TIM_ICPolarity_Rising; // _Falling
TIM_ICInitStructure.TIM_ICSelection = TIM_ICSelection_DirectTI;
TIM_ICInitStructure.TIM_ICPrescaler = TIM_ICPSC_DIV1;
TIM_ICInitStructure.TIM_ICFilter = 0x0;
TIM_PWMIConfig(TIM3, &TIM_ICInitStructure);
TIM_SelectInputTrigger(TIM3, TIM_TS_TI2FP2);
TIM_SelectSlaveMode(TIM3, TIM_SlaveMode_Reset);
TIM_SelectMasterSlaveMode(TIM3, TIM_MasterSlaveMode_Enable);
TIM_Cmd(TIM3, ENABLE);
TIM_ITConfig(TIM3, TIM_IT_CC2, ENABLE);
}
void NVIC_Configuration(void) {
NVIC_InitTypeDef NVIC_InitStructure;
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);
}
float IC2Value, DutyCycle, Frequency;
void TIM3_IRQHandler(void) {
TIM_ClearITPendingBit(TIM3, TIM_IT_CC2);
IC2Value = TIM_GetCapture2(TIM3);
if (IC2Value != 0) {
DutyCycle = (TIM_GetCapture1(TIM3) * 100) / IC2Value;
Frequency = SystemCoreClock / IC2Value;
} else {
DutyCycle = 0;
Frequency = 0;
}
}
