Mike Fiore / Mbed 2 deprecated stm32f4-stop-mode

testing stop mode on stm32f4 devices

Dependencies:   mbed-rtos mbed

main.cpp@0:424b9fd546c0, 2016-01-20 (annotated)

Committer:
mfiore
Date:
Wed Jan 20 20:57:45 2016 +0000
Revision:
0:424b9fd546c0
remove rtos library from project and device will no longer wake up from stop mode

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mfiore 0:424b9fd546c0 1 #include "mbed.h"
mfiore 0:424b9fd546c0 2 #include <time.h>
mfiore 0:424b9fd546c0 3 #include <rtc_api.h>
mfiore 0:424b9fd546c0 4
mfiore 0:424b9fd546c0 5 int is_rtc_enabled(void) {
mfiore 0:424b9fd546c0 6 return (RTC ->ISR & RTC_ISR_INITS ) && (RTC ->ISR & RTC_ISR_RSF );
mfiore 0:424b9fd546c0 7 }
mfiore 0:424b9fd546c0 8
mfiore 0:424b9fd546c0 9 int main() {
mfiore 0:424b9fd546c0 10 // attach our custom RTC enabled function so time can survive across sleeps & resets
mfiore 0:424b9fd546c0 11 attach_rtc(&rtc_read, &rtc_write, &rtc_init, &is_rtc_enabled);
mfiore 0:424b9fd546c0 12 if (!is_rtc_enabled())
mfiore 0:424b9fd546c0 13 set_time(0);
mfiore 0:424b9fd546c0 14 RTC_HandleTypeDef RtcHandle;
mfiore 0:424b9fd546c0 15 RtcHandle.Instance = RTC;
mfiore 0:424b9fd546c0 16
mfiore 0:424b9fd546c0 17 int interval = 4;
mfiore 0:424b9fd546c0 18
mfiore 0:424b9fd546c0 19 while(true) {
mfiore 0:424b9fd546c0 20
mfiore 0:424b9fd546c0 21 __PWR_CLK_ENABLE();
mfiore 0:424b9fd546c0 22 HAL_PWR_EnableBkUpAccess();
mfiore 0:424b9fd546c0 23
mfiore 0:424b9fd546c0 24 HAL_PWREx_EnableMainRegulatorLowVoltage();
mfiore 0:424b9fd546c0 25 HAL_PWREx_EnableFlashPowerDown();
mfiore 0:424b9fd546c0 26 HAL_PWREx_EnableLowRegulatorLowVoltage();
mfiore 0:424b9fd546c0 27
mfiore 0:424b9fd546c0 28 // make sure RTC and LSE stay on while we're asleep
mfiore 0:424b9fd546c0 29 RCC ->BDCR |= RCC_BDCR_LSEON;
mfiore 0:424b9fd546c0 30 RCC ->BDCR |= RCC_BDCR_RTCEN;
mfiore 0:424b9fd546c0 31
mfiore 0:424b9fd546c0 32 printf("configuring wakeup timer for %lu seconds from now\r\n", interval);
mfiore 0:424b9fd546c0 33
mfiore 0:424b9fd546c0 34 HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, interval, RTC_WAKEUPCLOCK_CK_SPRE_16BITS );
mfiore 0:424b9fd546c0 35
mfiore 0:424b9fd546c0 36 printf("entering sleep mode %08x\r\n", RTC->ISR);
mfiore 0:424b9fd546c0 37 fflush(stdout);
mfiore 0:424b9fd546c0 38
mfiore 0:424b9fd546c0 39 // clear any pending interrupts
mfiore 0:424b9fd546c0 40 EXTI ->PR = (1 << 22);
mfiore 0:424b9fd546c0 41
mfiore 0:424b9fd546c0 42 HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI );
mfiore 0:424b9fd546c0 43
mfiore 0:424b9fd546c0 44 HAL_PWREx_DisableMainRegulatorLowVoltage();
mfiore 0:424b9fd546c0 45 HAL_PWREx_DisableFlashPowerDown();
mfiore 0:424b9fd546c0 46 HAL_PWREx_DisableLowRegulatorLowVoltage();
mfiore 0:424b9fd546c0 47
mfiore 0:424b9fd546c0 48 __HAL_RTC_WAKEUPTIMER_CLEAR_FLAG(&RtcHandle, RTC_FLAG_WUTF);
mfiore 0:424b9fd546c0 49
mfiore 0:424b9fd546c0 50 // reconfigure PLL
mfiore 0:424b9fd546c0 51 SetSysClock();
mfiore 0:424b9fd546c0 52 wait(1.0);
mfiore 0:424b9fd546c0 53 printf("wake\r\n");
mfiore 0:424b9fd546c0 54 }
mfiore 0:424b9fd546c0 55
mfiore 0:424b9fd546c0 56 return 0;
mfiore 0:424b9fd546c0 57 }