Diff: inc/standby.h

Revision:

0:68ca78749806

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/inc/standby.h	Mon Mar 11 09:24:37 2019 +0000
@@ -0,0 +1,72 @@
+#ifndef _DSA_STANDBY_H_
+#define _DSA_STANDBY_H_
+
+#include "mbed.h"
+#include "rtc_api_hal.h"
+
+enum WakeupType {
+    WAKEUP_RESET,
+    WAKEUP_TIMER,
+    WAKEUP_PIN
+};
+
+static RTC_HandleTypeDef RtcHandle;
+
+void rtc_set_wake_up_timer_s(uint32_t delta)
+{
+    uint32_t clock = RTC_WAKEUPCLOCK_CK_SPRE_16BITS;
+
+    // HAL_RTCEx_SetWakeUpTimer_IT will assert that delta is 0xFFFF at max
+    if (delta > 0xFFFF) {
+        delta -= 0x10000;
+        clock = RTC_WAKEUPCLOCK_CK_SPRE_17BITS;
+    }
+
+    RtcHandle.Instance = RTC;
+
+    HAL_StatusTypeDef status = HAL_RTCEx_SetWakeUpTimer_IT(&RtcHandle, delta, clock);
+
+    if (status != HAL_OK) {
+        printf("Set wake up timer failed: %d\n", status);
+        NVIC_SystemReset();
+     }
+}
+
+WakeupType get_wakeup_type() {
+
+    if(READ_BIT(RTC->ISR, RTC_ISR_WUTF))
+        return WAKEUP_TIMER;
+
+    // this is set by timer too, but that's checked already
+    // above.
+    if(READ_BIT(PWR->CSR, PWR_CSR_WUF))
+        return WAKEUP_PIN;
+
+    return WAKEUP_RESET;
+}
+
+void standby(int seconds) {
+    printf("Going to sleep!\n");
+
+    core_util_critical_section_enter();
+
+    // Clear wakeup flag, just in case.
+    SET_BIT(PWR->CR, PWR_CR_CWUF);
+
+    // Enable wakeup timer.
+    rtc_set_wake_up_timer_s(seconds);
+
+    // Enable debug interface working in standby. Causes power consumption to increase drastically while in standby.
+    //HAL_DBGMCU_EnableDBGStandbyMode();
+
+    HAL_PWR_EnterSTANDBYMode();
+
+    // this should not happen...
+    rtc_deactivate_wake_up_timer();
+    core_util_critical_section_exit();
+
+    // something went wrong, let's reset
+    NVIC_SystemReset();
+}
+
+#endif // _DSA_STANDBY_H_