Question
DMA Interrupt not trigger
here i generate pulse using pwm generation.. where i need to stop at n th pulse.. so i use RCR register to stop it..
where my mcu handle only 8 bit data to the RCR register.. so i split the data into array "RCR_Data" and stores as source destination
i call the DMA to get the value from Source to destination as "&htim1.Instance->RCR" address... once DMA complete the process
it should says to end the timer generation.. but here i can't get the interrupt handling to call the callback function and stop the timer...
Thanks for advance.. please lets us help to solve this problem...
void MyDMA_TransferComplete(DMA_HandleTypeDef *hdma) {
if (hdma->Instance == hdma_tim1_ch1.Instance) {
// Disable everything in sequence
__HAL_TIM_DISABLE_DMA(&htim1, TIM_DMA_UPDATE);
TIM1->CR1 &= ~TIM_CR1_CEN; // Force disable timer
TIM1->CCER &= ~TIM_CCER_CC1E; // Force disable channel output
// Standard cleanup
HAL_TIM_PWM_Stop(&htim1, TIM_CHANNEL_1);
__HAL_TIM_DISABLE(&htim1);
HAL_DMA_Abort(hdma);
// Visual indication
HAL_GPIO_TogglePin(GPIOA, GPIO_PIN_5); // Use PA5 which is configured as output
}
}
uint8_t RCR_Data[] = {10,20,30,40,50};
void Start_DMA_RCR_Update(void) {
// Register callback
HAL_DMA_RegisterCallback(&hdma_tim1_ch1, HAL_DMA_XFER_CPLT_CB_ID, MyDMA_TransferComplete);
// Calculate direct address to RCR register (RCR is at offset 0x30 from TIM base)
uint32_t rcrAddress = (uint32_t)&htim1.Instance->RCR;
// Make sure DMA uses proper alignment
HAL_DMA_Start_IT(&hdma_tim1_ch1, (uint32_t)RCR_Data, rcrAddress, 5);
// Enable update DMA request
__HAL_TIM_ENABLE_DMA(&htim1, TIM_DMA_UPDATE);
// Start PWM
HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_1);
}