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application: add mechanism to remain in standby

This commit is contained in:
King Kévin 2019-12-21 19:28:39 +01:00
parent 34f6b52969
commit 27d97f565c
1 changed files with 16 additions and 0 deletions
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16
application.c
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@ -37,6 +37,7 @@
#include <libopencm3/stm32/dbgmcu.h> // debug utilities
#include <libopencm3/stm32/desig.h> // design utilities
#include <libopencm3/stm32/flash.h> // flash utilities
#include <libopencm3/stm32/f1/bkp.h> // access to backup registers
/* own libraries */
#include "global.h" // board definitions
@ -1221,9 +1222,21 @@ void main(void)
DBGMCU_CR |= DBGMCU_CR_STOP; // allow debug also in stop mode (keep clock powered)
DBGMCU_CR |= DBGMCU_CR_SLEEP; // allow debug also in sleep mode (keep clock powered)
#else
RCC_APB1ENR |= RCC_APB1ENR_BKPEN | RCC_APB1ENR_PWREN; // enable access to power register
if (RCC_CSR & RCC_CSR_IWDGRSTF && 0x22 == BKP_DR1) { // we have been woken up by independent watchdog but actually want to stay in standby mode
RCC_CSR |= RCC_CSR_RMVF; // clear reset flags
// the reset will have clearer the software set watchdog
while (true) { // go to standby
SCB_SCR |= SCB_SCR_SLEEPDEEP; // Cortex-M3 standby setting
pwr_set_standby_mode(); // power setting
pwr_clear_wakeup_flag(); // clear wake-up flag to be able to sleep
__WFI(); // go to standby (e.g. shut down)
}
}
// setup watchdog to reset in case we get stuck (i.e. when an error occurred)
iwdg_set_period_ms(WATCHDOG_PERIOD); // set independent watchdog period
iwdg_start(); // start independent watchdog
BKP_DR1 = 0; // clear backup register to not indicate we want to stay in stand by
#endif
board_setup(); // setup board
@ -1335,6 +1348,9 @@ void main(void)
rtc_internal_tick_flag = false; // reset flag
action = true; // action has been performed
while (!interactive && rtc_get_counter_val() >= last_connect_time + SHUTDOWN_TIMEOUT) { // time to shut down
#if !DEBUG
BKP_DR1 = 0x22; // indicate we want to stay in standby mode
#endif
display_off(); // cut power to displays (at stop D+ pull-up to indicate disconnect)
SCB_SCR |= SCB_SCR_SLEEPDEEP; // Cortex-M3 standby setting
pwr_set_standby_mode(); // power setting