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Increase MSI clock frequency when exiting deep sleep 

This will optimize down the time it takes to restore the clock
settings when getting out of deep sleep.

If 48MHz is available let's use it, otherwise at least 4MHz should be
available for any MCU with MSI.
pull/12202/head
Laurent Meunier 2020-01-07 17:58:53 +01:00
parent b1b0673622
commit 022c0eb7dc
1 changed files with 5 additions and 1 deletions
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6
targets/TARGET_STM/sleep.c
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@ -98,7 +98,11 @@ static void ForceOscOutofDeepSleep(void)
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
RCC_OscInitStruct.MSIState = RCC_MSI_ON;
RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_4; // Intermediate freq, 1MHz range
#if defined RCC_MSIRANGE_11
RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; // Highest freq, 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;