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STM32L4: Fix sleep implementation #7813

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Merged
merged 2 commits into from
Oct 1, 2018
Merged

STM32L4: Fix sleep implementation #7813

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97fef11
STM32L4: Fix sleep implementation
MSiglreithmaierRB Aug 13, 2018
ea6c886
STM32L4: Use HAL layer functions for sleep implementation
MSiglreithmaierRB Sep 26, 2018
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20 changes: 19 additions & 1 deletion targets/TARGET_STM/sleep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -52,7 +52,7 @@ static void wait_loop(uint32_t timeout)


// On L4 platforms we've seen unstable PLL CLK configuraiton
// when DEEP SLEEP exits just few �s after being entered
// when DEEP SLEEP exits just few µs after being entered
// So we need to force MSI usage before setting clocks again
static void ForcePeriphOutofDeepSleep(void)
{
Expand Down Expand Up @@ -151,7 +151,25 @@ void hal_sleep(void)
core_util_critical_section_enter();

// Request to enter SLEEP mode
#if TARGET_STM32L4
// State Transitions (see 5.3 Low-power modes, Fig. 13):
// * (opt): Low Power Run (LPR) Mode -> Run Mode
// * Run Mode -> Sleep
// --- Wait for Interrupt --
// * Sleep -> Run Mode
// * (opt): Run Mode -> Low Power Run Mode

// [5.4.1 Power control register 1 (PWR_CR1)]
// LPR: When this bit is set, the regulator is switched from main mode (MR) to low-power mode (LPR).
int lowPowerMode = PWR->CR1 & PWR_CR1_LPR;
if (lowPowerMode) {
HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
} else {
HAL_PWR_EnterSLEEPMode(PWR_LOWPOWERREGULATOR_ON, PWR_SLEEPENTRY_WFI);
}
#else
HAL_PWR_EnterSLEEPMode(PWR_MAINREGULATOR_ON, PWR_SLEEPENTRY_WFI);
#endif

// Enable IRQs
core_util_critical_section_exit();
Expand Down