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Fix the slow wake-up of STM32U5 from deep sleep #489

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Merged
merged 2 commits into from
Aug 26, 2025
Merged

Fix the slow wake-up of STM32U5 from deep sleep #489

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cb4ccc7
set MSI clock to RCC_MSIRANGE_0 (48MHz) for STM32U5 after wake-up fro…
wdx04 Aug 25, 2025
33c7143
modify the hardcoded HSICalibrationValue(16) to RCC_HSICALIBRATION_DE…
wdx04 Aug 26, 2025
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8 changes: 5 additions & 3 deletions targets/TARGET_STM/sleep.c
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Original file line number Diff line number Diff line change
Expand Up @@ -98,16 +98,18 @@ __WEAK void ForceOscOutofDeepSleep(void)
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
#if defined RCC_MSIRANGE_11
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; // Highest freq, 48MHz range
#if defined (TARGET_STM32U5)
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_0; // Highest freq for U5, 48MHz range
#elif defined (RCC_MSIRANGE_11)
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; // Highest freq for L4/L5, 48MHz range
#else
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6; // 4MHz range
#endif
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
#else /* defined RCC_SYSCLKSOURCE_MSI */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = 16;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
#endif /* defined RCC_SYSCLKSOURCE_MSI */

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