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stm32l4: rcc: MSI range handling

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Karl Palsson
2016-03-12 22:16:09 +00:00
parent 97d644c4d3
commit c5b00c3dda
2 changed files with 47 additions and 0 deletions
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29
lib/stm32/l4/rcc.c
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@@ -356,4 +356,33 @@ uint32_t rcc_system_clock_source(void)
return ((RCC_CFGR >> RCC_CFGR_SWS_SHIFT) & RCC_CFGR_SWS_MASK);
}
/**
* Set the msi run time range.
* Can only be called when MSI is either OFF, or when MSI is on _and_
* ready. (RCC_CR_MSIRDY bit). @sa rcc_set_msi_range_standby
* @param msi_range range number @ref rcc_cr_msirange
*/
void rcc_set_msi_range(uint32_t msi_range)
{
uint32_t reg = RCC_CR;
reg &= ~(RCC_CR_MSIRANGE_MASK << RCC_CR_MSIRANGE_SHIFT);
reg |= msi_range << RCC_CR_MSIRANGE_SHIFT;
RCC_CR = reg | RCC_CR_MSIRGSEL;
}
/**
* Set the msi range after reset/standby.
* Until MSIRGSEl bit is set, this defines the MSI range.
* Note that not all MSI range values are allowed here!
* @sa rcc_set_msi_range
* @param msi_range range number valid for post standby @ref rcc_csr_msirange
*/
void rcc_set_msi_range_standby(uint32_t msi_range)
{
uint32_t reg = RCC_CSR;
reg &= ~(RCC_CSR_MSIRANGE_MASK << RCC_CSR_MSIRANGE_SHIFT);
reg |= msi_range << RCC_CSR_MSIRANGE_SHIFT;
RCC_CSR = reg;
}
/**@}*/