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STM32: Add MCO configuration for the STM32L1xx. From Jussi Kivilinna

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This commit is contained in:
Gregory Nutt 2014-12-02 10:19:37 -06:00
parent 13de352dcd
commit 6d7106424e
1 changed files with 36 additions and 0 deletions
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36
arch/arm/src/stm32/stm32_rcc.h
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@ -153,6 +153,42 @@ static inline void stm32_mcoconfig(uint32_t source)
}
#endif
/************************************************************************************
* Name: stm32_mcodivconfig
*
* Description:
* Selects the clock source to output and clock divider on MC pin (PA4) for
* stm32l1xxx. PA4 should be configured in alternate function mode.
*
* Input Parameters:
* source - One of the definitions for the RCC_CFGR_MCOSEL definitions from
* chip/stm32l15xxx_rcc.h {RCC_CFGR_MCOSEL_DISABLED, RCC_CFGR_MCOSEL_SYSCLK,
* RCC_CFGR_MCOSEL_HSICLK, RCC_CFGR_MCOSEL_MSICLK, RCC_CFGR_MCOSEL_HSECLK,
* RCC_CFGR_MCOSEL_PLLCLK, RCC_CFGR_MCOSEL_LSICLK, RCC_CFGR_MCOSEL_LSECLK}
* divider - One of the definitions for the RCC_CFGR_MCOPRE definitions from
* chip/stm32l15xxx_rcc.h {RCC_CFGR_MCOPRE_DIV1, RCC_CFGR_MCOPRE_DIV2,
* RCC_CFGR_MCOPRE_DIV4, RCC_CFGR_MCOPRE_DIV8, RCC_CFGR_MCOPRE_DIV16}
*
* Returned Value:
* None
*
************************************************************************************/
#if defined(CONFIG_STM32_STM32L15XX)
static inline void stm32_mcodivconfig(uint32_t source, uint32_t divider)
{
uint32_t regval;
/* Set MCO source */
regval = getreg32(STM32_RCC_CFGR);
regval &= ~(RCC_CFGR_MCOSEL_MASK);
regval |= (source & RCC_CFGR_MCOSEL_MASK);
regval &= ~(RCC_CFGR_MCOPRE_MASK);
regval |= (divider & RCC_CFGR_MCOPRE_MASK);
putreg32(regval, STM32_RCC_CFGR);
}
#endif
/************************************************************************************
* Name: stm32_mco2config