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fix: set CPU2 low power mode for STM32WBxx #87

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merged 1 commit into from
Jan 10, 2023
Merged

fix: set CPU2 low power mode for STM32WBxx #87

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40 changes: 37 additions & 3 deletions src/low_power.c
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Original file line number Diff line number Diff line change
Expand Up @@ -459,7 +459,21 @@ void LowPower_stop(serial_t *obj)
__HAL_RCC_WAKEUPSTOP_CLK_CONFIG(RCC_STOP_WAKEUPCLOCK_HSI);
#endif
#endif

#if defined(STM32WBxx)
/* Set low-power mode of CPU2 */
/* Note: Typically, action performed by CPU2 on a dual core application.
Since this example is single core, perform it by CPU1. */
/* Note: On STM32WB, both CPU1 and CPU2 must be in low-power mode
to set the entire System in low-power mode, corresponding to
the deepest low-power mode possible.
For example, CPU1 in Stop2 mode and CPU2 in Shutdown mode
will make system enter in Stop2 mode. */
#if defined(LL_PWR_MODE_STOP2)
LL_C2_PWR_SetPowerMode(LL_PWR_MODE_STOP2);
#else
LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
#endif
#endif
/* Enter Stop mode */
#if defined(UART_WKUP_SUPPORT) && (defined(PWR_CPUCR_RETDS_CD) \
|| defined(PWR_CR1_LPMS_STOP2) || defined(PWR_LOWPOWERMODE_STOP2) \
Expand Down Expand Up @@ -528,7 +542,17 @@ void LowPower_standby()
/* Enable the fast wake up from Ultra low power mode */
HAL_PWREx_EnableFastWakeUp();
#endif

#if defined(STM32WBxx)
/* Set low-power mode of CPU2 */
/* Note: Typically, action performed by CPU2 on a dual core application.
Since this example is single core, perform it by CPU1. */
/* Note: On STM32WB, both CPU1 and CPU2 must be in low-power mode
to set the entire System in low-power mode, corresponding to
the deepest low-power mode possible.
For example, CPU1 in Stop2 mode and CPU2 in Shutdown mode
will make system enter in Stop2 mode. */
LL_C2_PWR_SetPowerMode(LL_PWR_MODE_STANDBY);
#endif
HAL_PWR_EnterSTANDBYMode();
}

Expand All @@ -550,7 +574,17 @@ void LowPower_shutdown()
#elif defined(PWR_MPUCR_CSSF)
__HAL_PWR_CLEAR_FLAG(PWR_MPUCR_CSSF);
#endif

#if defined(STM32WBxx)
/* Set low-power mode of CPU2 */
/* Note: Typically, action performed by CPU2 on a dual core application.
Since this example is single core, perform it by CPU1. */
/* Note: On STM32WB, both CPU1 and CPU2 must be in low-power mode
to set the entire System in low-power mode, corresponding to
the deepest low-power mode possible.
For example, CPU1 in Stop2 mode and CPU2 in Shutdown mode
will make system enter in Stop2 mode. */
LL_C2_PWR_SetPowerMode(LL_PWR_MODE_SHUTDOWN);
#endif
#if defined(PWR_LOWPOWERMODE_SHUTDOWN) || defined(PWR_CR1_LPMS_SHUTDOWN) || defined(LL_PWR_SHUTDOWN_MODE)
/* LSE must be on to use shutdown mode */
if (__HAL_RCC_GET_FLAG(RCC_FLAG_LSERDY) == SET) {
Expand Down