Question
How to use multiple timer capture Interrupt in stm32
Hii....i AM WORKING ON stm32l475rg MCU. i want to use two different timers for measurement of two different PWM inputs signals. for this one i am using capture call back function but i am facing problem to measure duty cycle of both channels at a time.
#include "main.h"
float t1=0.00;
float t2=0.00;
uint32_t frequency=0;
volatile float duty_c=0.00;
float t1a=0.00;
float t2a=0.00;
uint32_t frequency_a=0;
volatile float duty_c_a=0.00;
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if(htim->Instance == TIM3)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
t1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
if (t1 != 0)
{
t2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
frequency=80000000/t1;
duty_c=(t2/t1)*100.00;
}
}
}
else if(htim->Instance == TIM2)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
t1a = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
if (t1a != 0)
{
t2a = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
duty_c_a = (t2a / t1a) * 100.0;
frequency_a=80000000/t1;
}
}
}
}
int main(void)
{
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim3, TIM_CHANNEL_2);
HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_1);
HAL_TIM_IC_Start_IT(&htim2, TIM_CHANNEL_2);
}
i share my code here. i use timer2 and timer 3 for measurement of pwm duty cycle of two different pwm input.