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stm32L4+ going to STOP2 lowpower mode must keep SRAM3#66

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fpistm merged 1 commit into
stm32duino:mainfrom
FRASTM:issue64
Jan 3, 2022
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stm32L4+ going to STOP2 lowpower mode must keep SRAM3#66
fpistm merged 1 commit into
stm32duino:mainfrom
FRASTM:issue64

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@FRASTM FRASTM commented Dec 16, 2021 •
edited by fpistm
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On the stm32L4+ , the low power DEEP_SLEEP mode corresponds to STOP2 low power
mode. In this case, the SRAM3 must be powered during the low power phase since it is a part of the SRAM area for this target (SRAM is made of SRAM1+SRAM2+SRAM3).
By default, the content of the SRAM3 is lost during STOP2 low power mode and consequently this must be changed.

Fixes #64

Signed-off-by: Francois Ramu [email protected]

@FRASTM
stm32L4+ going to STOP2 lowpower mode must keep SRAM3
8f06e6a 
The low power DEEP_SLEEP mode corresponds to STOP2 low power
mode for the stm32L4+. In this case, the SRAM3 must be powered
during the low power phase since it is a part of the SRAM
area for this target.

Signed-off-by: Francois Ramu <[email protected]>
@fpistm fpistm added the enhancement New feature or request label Dec 16, 2021
@fpistm fpistm added this to the 1.2.0 milestone Dec 16, 2021
@fpistm fpistm self-requested a review December 16, 2021 09:03
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FRASTM commented Dec 16, 2021

Going to STOP2 (stm32duino deepsleep mode) with SRAM3 powered is similar (in terms of current consumption and wakeup time) to STOP1 mode.

@@ -295,8 +295,8 @@ void LowPower_stop(serial_t *obj)
       || (WakeUpUart->Instance == (USART_TypeDef *)LPUART2_BASE)
 #endif
      ) {
-    // STM32L4xx supports STOP2 mode which halves consumption
-    HAL_PWREx_EnterSTOP2Mode(PWR_STOPENTRY_WFI);
+    // STM32L4xx supports STOP1 mode which halves consumption and maintains SRAM3
+    HAL_PWREx_EnterSTOP1Mode(PWR_STOPENTRY_WFI);
   } else
 #endif
   {

@FRASTM FRASTM mentioned this pull request Dec 22, 2021
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@fpistm fpistm merged commit 34f73c3 into stm32duino:main Jan 3, 2022
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enhancement New feature or request

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STM32L4R5xx does not restart or resume code execution after wakeup from deep sleep

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