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stmhal/modmachine: Improve support for sleep/deepsleep on F7 MCUs.

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Changes for F7 are:
- machine.reset_cause() now reports DEEPSLEEP_RESET correctly;
- machine.sleep() is further optimised to reduce power consumption;
- machine.deepsleep() is now implemented and working.
This commit is contained in:
Damien George 2017-08-23 17:00:02 +10:00
parent 49316b864b
commit fc483706d3
1 changed files with 18 additions and 1 deletions
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19
stmhal/modmachine.c
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@ -77,6 +77,12 @@ void machine_init(void) {
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->CR |= PWR_CR_CSBF;
} else
#elif defined(MCU_SERIES_F7)
if (PWR->CSR1 & PWR_CSR1_SBF) {
// came out of standby
reset_cause = PYB_RESET_DEEPSLEEP;
PWR->CR1 |= PWR_CR1_CSBF;
} else
#endif
{
// get reset cause from RCC flags
@ -455,7 +461,11 @@ STATIC mp_obj_t machine_sleep(void) {
// takes longer to wake but reduces stop current
HAL_PWREx_EnableFlashPowerDown();
# if defined(MCU_SERIES_F7)
HAL_PWR_EnterSTOPMode((PWR_CR1_LPDS | PWR_CR1_LPUDS | PWR_CR1_FPDS | PWR_CR1_UDEN), PWR_STOPENTRY_WFI);
# else
HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
#endif
// reconfigure the system clock after waking up
@ -483,7 +493,7 @@ MP_DEFINE_CONST_FUN_OBJ_0(machine_sleep_obj, machine_sleep);
STATIC mp_obj_t machine_deepsleep(void) {
rtc_init_finalise();
#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
#if defined(MCU_SERIES_L4)
printf("machine.deepsleep not supported yet\n");
#else
// We need to clear the PWR wake-up-flag before entering standby, since
@ -505,8 +515,15 @@ STATIC mp_obj_t machine_deepsleep(void) {
// clear RTC wake-up flags
RTC->ISR &= ~(RTC_ISR_ALRAF | RTC_ISR_ALRBF | RTC_ISR_WUTF | RTC_ISR_TSF);
#if defined(MCU_SERIES_F7)
// disable wake-up flags
PWR->CSR2 &= ~(PWR_CSR2_EWUP6 | PWR_CSR2_EWUP5 | PWR_CSR2_EWUP4 | PWR_CSR2_EWUP3 | PWR_CSR2_EWUP2 | PWR_CSR2_EWUP1);
// clear global wake-up flag
PWR->CR2 |= PWR_CR2_CWUPF6 | PWR_CR2_CWUPF5 | PWR_CR2_CWUPF4 | PWR_CR2_CWUPF3 | PWR_CR2_CWUPF2 | PWR_CR2_CWUPF1;
#else
// clear global wake-up flag
PWR->CR |= PWR_CR_CWUF;
#endif
// enable previously-enabled RTC interrupts
RTC->CR |= save_irq_bits;