Hello!
I have my ADC DMA setup so that Timer 1 will trigger a conversion with a specific frequency. Both DMA continuous requests and Continuous conversions are disabled. DMA is set to Normal mode.
When the buffer is full and HAL_ADC_ConvCpltCallback is triggered, I stop the ADC with HAL_ADC_Stop_DMA, and some processing is performed on the DMA buffer. Once the processing is completed the ADC is restarted with HAL_ADC_Start_DMA.
This all works as expected until the MCU enters and exits from STOP mode. I'm unable to restart the ADC, the DMA buffer still contains the previous data, and HAL_ADC_ConvCpltCallback is never triggered.
Here's my code:
while (1) {
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, GPIO_PIN_SET);
HAL_ADC_Start_DMA(&hadc1, (uint32_t*)sampleBuffer, samplesPerFrame);
while (dataReadyFlag == 0)
;
dataReadyFlag = 0;
// TODO: Process sampleBuffer
if ((uint32_t)(HAL_GetTick() - prevTime) > awakeTimer) {
prevTime = HAL_GetTick();
awakeTimer = 0;
HAL_ADC_Stop_DMA(&hadc1);
HAL_GPIO_WritePin(LD3_GPIO_Port, LD3_Pin, GPIO_PIN_RESET);
// Enter STOP 1 mode.
HAL_SuspendTick();
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, 0x1999, RTC_WAKEUPCLOCK_RTCCLK_DIV16);
HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);
// Wake up
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
SystemClock_Config();
HAL_ResumeTick();
awakeTimer += 10000;
dataReadyFlag = 0;
}
}
Is there something else I need to do? Do I need to restart the Timer somehow? Thanks!
MCU: STM32L432KC, Board Nucleo-L432KC
