Hello,
I am using the Sensortile, it's a development kit based on STM32L476.
I am running a simple code to test the stand by mode :
int main( void )
{
uint32_t msTick, msTickPrev = 0;
/* STM32L4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Configure the Systick to generate an interrupt each 1 msec
- Set NVIC Group Priority to 4
- Global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock */
SystemClock_Config();
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU); //clear wake up bit
HAL_DBGMCU_DisableDBGStandbyMode(); //disable debug in standby
/* Initialize LED */
BSP_LED_Init(LED1);
BSP_LED_Off(LED1);
#ifdef NOT_DEBUGGING
/* Initialize LEDSWD: Cannot be used during debug because it overrides SWDCLK pin configuration */
BSP_LED_Init(LEDSWD);
BSP_LED_Off(LEDSWD);
#endif
/* Initialize RTC */
RTC_Config();
RTC_TimeStampConfig();
/* enable USB power on Pwrctrl CR2 register */
HAL_PWREx_EnableVddUSB();
if(SendOverUSB) /* Configure the USB */
{
/*** USB CDC Configuration ***/
/* Init Device Library */
USBD_Init(&USBD_Device, &VCP_Desc, 0);
/* Add Supported Class */
USBD_RegisterClass(&USBD_Device, USBD_CDC_CLASS);
/* Add Interface callbacks for AUDIO and CDC Class */
USBD_CDC_RegisterInterface(&USBD_Device, &USBD_CDC_fops);
/* Start Device Process */
USBD_Start(&USBD_Device);
}
else /* Configure the SDCard */
{
DATALOG_SD_Init();
}
HAL_Delay(200);
HAL_RTCEx_WakeUpTimerIRQHandler(&RtcHandle);
HAL_RTCEx_DeactivateWakeUpTimer(&RtcHandle);
/* Configure and disable all the Chip Select pins */
Sensor_IO_SPI_CS_Init_All();
/* Initialize and Disable the available sensors */
initializeAllSensors();
disableAllSensors();
while (1)
{
/* Get sysTick value and check if it's time to execute the task */
msTick = HAL_GetTick();
if(msTick % DATA_PERIOD_MS == 0 && msTickPrev != msTick)
{
msTickPrev = msTick;
HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle,6,RTC_WAKEUPCLOCK_CK_SPRE_16BITS);
HAL_PWR_EnterSTANDBYMode();
}
}
}
with DATA_PERIOD_MS=6000
So the MCU will enter standby mode for 6 seconds and then wake up for 6 econds..
Thank you
Rony Moussa
