Posted on November 17, 2015 at 21:13Greetings,
So I decided to play with the RTCex library, specifically the much abbreviated new timer_IT function. My system is designed to shutdown after every code iteration and be awakened via the alarm(wakeup timer).
The issue is, the timer only works up to 30seconds. I can input any counter up to that point and the system wakes near the specified time. Not sure why, other than maybe I'm catching a edge at that point somehow. Thoughts? I've tried changing the RTC config parameters as well (WAKEUP, PUSHPULL, etc), to no avail.
Here is my code so far:
&sharpdefine ALARM_TIMER ox1E046 //60s (considering 16MHz clock, using LSI)
__HAL_RCC_PWR_CLK_ENABLE();
HAL_RTCEx_DeactivateWakeUpTimer(&hrtc);
__HAL_PWR_CLEAR_FLAG(PWR_FLAG_WU);
__HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&hrtc, RTC_FLAG_WUTF);
/*♯♯ Setting the Wake up time ♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯♯*/
HAL_RTCEx_SetWakeUpTimer_IT(&hrtc, ALARM_TIMER,
RTC_WAKEUPCLOCK_RTCCLK_DIV16);
/* Request to enter STANDBY mode */
HAL_Delay(3000);
HAL_PWR_EnterSTANDBYMode(); //***ENTER STANDBY***
//Configuration is thus (as recommended by another RTCex thread and CubeMX):
void MX_RTC_Init(void)
{
/**Initialize RTC
*/
hrtc.Instance = RTC;
hrtc.Init.HourFormat = RTC_HOURFORMAT_24;
hrtc.Init.AsynchPrediv = 127;
hrtc.Init.SynchPrediv = 255;
hrtc.Init.OutPut = RTC_OUTPUT_DISABLE;
hrtc.Init.OutPutPolarity = RTC_OUTPUT_POLARITY_HIGH;
hrtc.Init.OutPutType = RTC_OUTPUT_TYPE_OPENDRAIN;
HAL_RTC_Init(&hrtc);
}
void HAL_RTC_MspInit(RTC_HandleTypeDef* hrtc)
{
if(hrtc->Instance==RTC)
{
/* USER CODE BEGIN RTC_MspInit 0 */
/* USER CODE END RTC_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_RTC_ENABLE();
/* Peripheral interrupt init*/
HAL_NVIC_SetPriority(RTC_WKUP_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(RTC_WKUP_IRQn);
/* USER CODE BEGIN RTC_MspInit 1 */
/* USER CODE END RTC_MspInit 1 */
}
}
#rtc #wakeup #timer #stm32
