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dpgeorgedpgeorge
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stmhal/modmachine: Improve support for sleep/deepsleep on F7 MCUs.
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.
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1 file changed

Lines changed: 18 additions & 1 deletion

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‎stmhal/modmachine.c‎

Lines changed: 18 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -77,6 +77,12 @@ void machine_init(void) {
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reset_cause = PYB_RESET_DEEPSLEEP;
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PWR->CR |= PWR_CR_CSBF;
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} else
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#elif defined(MCU_SERIES_F7)
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if (PWR->CSR1 & PWR_CSR1_SBF) {
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// came out of standby
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reset_cause = PYB_RESET_DEEPSLEEP;
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PWR->CR1 |= PWR_CR1_CSBF;
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} else
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#endif
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{
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// get reset cause from RCC flags
@@ -455,7 +461,11 @@ STATIC mp_obj_t machine_sleep(void) {
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// takes longer to wake but reduces stop current
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HAL_PWREx_EnableFlashPowerDown();
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# if defined(MCU_SERIES_F7)
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HAL_PWR_EnterSTOPMode((PWR_CR1_LPDS | PWR_CR1_LPUDS | PWR_CR1_FPDS | PWR_CR1_UDEN), PWR_STOPENTRY_WFI);
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# else
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HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI);
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#endif
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// reconfigure the system clock after waking up
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@@ -483,7 +493,7 @@ MP_DEFINE_CONST_FUN_OBJ_0(machine_sleep_obj, machine_sleep);
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STATIC mp_obj_t machine_deepsleep(void) {
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rtc_init_finalise();
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#if defined(MCU_SERIES_F7) || defined(MCU_SERIES_L4)
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#if defined(MCU_SERIES_L4)
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printf("machine.deepsleep not supported yet\n");
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#else
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// We need to clear the PWR wake-up-flag before entering standby, since
@@ -505,8 +515,15 @@ STATIC mp_obj_t machine_deepsleep(void) {
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// clear RTC wake-up flags
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RTC->ISR &= ~(RTC_ISR_ALRAF | RTC_ISR_ALRBF | RTC_ISR_WUTF | RTC_ISR_TSF);
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#if defined(MCU_SERIES_F7)
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// disable wake-up flags
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PWR->CSR2 &= ~(PWR_CSR2_EWUP6 | PWR_CSR2_EWUP5 | PWR_CSR2_EWUP4 | PWR_CSR2_EWUP3 | PWR_CSR2_EWUP2 | PWR_CSR2_EWUP1);
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// clear global wake-up flag
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PWR->CR2 |= PWR_CR2_CWUPF6 | PWR_CR2_CWUPF5 | PWR_CR2_CWUPF4 | PWR_CR2_CWUPF3 | PWR_CR2_CWUPF2 | PWR_CR2_CWUPF1;
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#else
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// clear global wake-up flag
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PWR->CR |= PWR_CR_CWUF;
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#endif
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// enable previously-enabled RTC interrupts
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RTC->CR |= save_irq_bits;

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