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STM: Fix us_ticker timestamp after deep sleep 

Use the `mbed_sdk_inited` flag to correct the `HAL_GetTick()` behavior
after waking up from deep sleep mode. `ticker_read_us()` must not be
used to read us_ticker timestamp after waking up until the us_ticker
context is restored. More detailed description in issue #8117.

Fixes #8117
pull/8136/head
Filip Jagodzinski 2018-09-14 14:20:54 +02:00
parent 2e5e23f7c1
commit 6821556b47
1 changed files with 9 additions and 0 deletions
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9
targets/TARGET_STM/sleep.c
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@ -158,6 +158,7 @@ void hal_sleep(void)
}
extern int serial_is_tx_ongoing(void);
extern int mbed_sdk_inited;
void hal_deepsleep(void)
{
@ -200,6 +201,10 @@ void hal_deepsleep(void)
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
#endif /* TARGET_STM32L4 */
/* Prevent HAL_GetTick() from using ticker_read_us() to read the
* us_ticker timestamp until the us_ticker context is restored. */
mbed_sdk_inited = 0;
// Verify Clock Out of Deep Sleep
ForceClockOutofDeepSleep();
@ -214,6 +219,10 @@ void hal_deepsleep(void)
restore_timer_ctx();
/* us_ticker context restored, allow HAL_GetTick() to read the us_ticker
* timestamp via ticker_read_us() again. */
mbed_sdk_inited = 1;
// Enable IRQs
core_util_critical_section_exit();
}