Hi,
I have STM32G0 series MCU. I want to receive and send IR datas. I can receive IR datas successfully with timer via DMA. and then I want to send these datas as IR datas.
I try to use 2 channels. I set one channel as output compare no output for timing base and I set one another as pwm generation. But I could not be successful. What am I doing wrong ?
I have a function in TIM1 capture compare interrupt as below, I don't use HAL_TIM_IRQHandler(&htim1) function there.
void TIM1_CC_IRQHandler(void)
{
/* USER CODE BEGIN TIM1_CC_IRQn 0 */
#ifndef USE_IRQ_HANDLER
/* USER CODE END TIM1_CC_IRQn 0 */
HAL_TIM_IRQHandler(&htim1);
/* USER CODE BEGIN TIM1_CC_IRQn 1 */
#endif
IR_Transmit_Start_IT(&htim1);
/* USER CODE END TIM1_CC_IRQn 1 */
}
void IR_Transmit_Start_IT(TIM_HandleTypeDef *htim)
{
if(__HAL_TIM_GET_FLAG(htim, TIM_FLAG_CC3))
{
// new pulse time load to timer
htim1.Instance->CCR3 = IR_Receive_Buffer[sendingDataIndex];
if(sendingDataIndex % 2 == 0)
{ HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_4);}
else
{HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4); }
sendingDataIndex++;
if(sendingDataIndex >= IR_receivedDataCount)
{
IR_receivedDataCount = 0;
sendingDataIndex = 0;
HAL_TIM_OC_Stop(&htim1, TIM_CHANNEL_3);
HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_4);
//HAL_GPIO_WritePin(GPIOA, IR_TRANSMIT_Pin, GPIO_PIN_SET);
__HAL_TIM_CLEAR_FLAG(&htim1, TIM_FLAG_CC2);
__HAL_TIM_CLEAR_FLAG(&htim1, TIM_FLAG_CC3);
__HAL_TIM_CLEAR_FLAG(&htim1, TIM_FLAG_CC4);
__HAL_TIM_DISABLE_IT(&htim1, TIM_IT_CC2);
__HAL_TIM_DISABLE_IT(&htim1, TIM_IT_CC3);
__HAL_TIM_DISABLE_IT(&htim1, TIM_IT_CC4);
__HAL_TIM_ENABLE_IT(htim, TIM_IT_TRIGGER);
}
}
}
When I am ready to send datas, I call below functions.
htim1.Instance->CCR3 = IR_Receive_Buffer[0];
__HAL_TIM_ENABLE_IT(&htim1, TIM_IT_CC3);
HAL_TIM_OC_Start(&htim1, TIM_CHANNEL_3);
Then program enters the interrupt routine but I have no success. Is there someone did same thing like this ?
