I want to use LPTIM1 of the STM32G0x1 to wake up the MCU, if it's not already awake, and start a DMA multichannel single conversion. I think I know how to do the DMA/ADC part after getting the ADC_MultiChannelSingleConversion example running; I'll the code from that project to this one later.. But the most part is waking up. Here's the relevant part of what I have:
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_LPTIM1_Init();
/* USER CODE BEGIN 2 */
/* Enable Power Clock */
__HAL_RCC_PWR_CLK_ENABLE();
RCC->IOPSMENR = 0x0000u;
RCC->AHBSMENR = 0x00300u;
RCC->APBSMENR1 = 0x9000u;
RCC->APBSMENR2 = 0x0000u;
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
if (HAL_LPTIM_TimeOut_Start_IT(&hlptim1, PERIOD, TIMEOUT) != HAL_OK)
{
Error_Handler();
}
/* Reduce the System clock to below 2 MHz */
SystemClock_Decrease();
/* Enter Sleep Mode, wake up is done once User push-button is pressed */
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
/* ... Low-power SLEEP mode ... */
__WFI();
/* System is Low Power Run mode when exiting Low Power Sleep mode,
disable low power run mode and reset the clock to initialization configuration */
HAL_PWREx_DisableLowPowerRunMode();
/* Configure the system clock for the RUN mode */
SystemClock_Config();
/* Re-init LED4 to toggle during Run mode */
if (LED_FLASH_PERIOD == ++led_flash_count)
{
led_flash_count = 0;
HAL_GPIO_TogglePin(LED_4_GPIO_Port, LED_4_Pin);
}
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Configure the main internal regulator output voltage
*/
HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE2);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI|RCC_OSCILLATORTYPE_LSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSIDiv = RCC_HSI_DIV1;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.LSIState = RCC_LSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0) != HAL_OK)
{
Error_Handler();
}
}
I can tell the MCU goes to sleep because the STMLInk connection is lost, but it never wakes up. What am I missing?
When the MCU wakes up, I want the LPTim1 interrupt handler to call HAL_ADC_Start_DMA. While awake, I'll see if I've collected all the data I need. That will take much longer than the LPTIM1 Timeout period, but I need the periodic conversions to continue to collect ADC at the same time. Is this possible, and how?
Thanks!
