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STM32 L1: stm32l15xx_rcc: Allow board to configure HSE clock in bypass-mode. Allows using MCO output from ST-link chip (on Nucleo and Discovery boards) as HSE input.

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This commit is contained in:
Juha Niskanen 2017-04-20 06:28:01 -06:00 committed by Gregory Nutt
parent 9281cd558e
commit e631ee4582
1 changed files with 4 additions and 0 deletions
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4
arch/arm/src/stm32/stm32l15xxx_rcc.c
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@ -480,7 +480,11 @@ static inline bool stm32_rcc_enablehse(void)
/* Enable External High-Speed Clock (HSE) */
regval = getreg32(STM32_RCC_CR);
#ifdef STM32_HSEBYP_ENABLE /* May be defined in board.h header file */
regval |= RCC_CR_HSEBYP; /* Enable HSE clock bypass */
#else
regval &= ~RCC_CR_HSEBYP; /* Disable HSE clock bypass */
#endif
regval |= RCC_CR_HSEON; /* Enable HSE */
putreg32(regval, STM32_RCC_CR);