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stm32: Support stm32f042 build from stm32/ directory

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-09-16 21:39:29 -04:00
parent 2c535106ee
commit a6d90bb95e
4 changed files with 41 additions and 4 deletions
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28
src/stm32/stm32f0.c
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@ -124,6 +124,29 @@ pll_setup(void)
RCC->CFGR3 = RCC_CFGR3_USBSW;
}
// Configure and enable internal 48Mhz clock on the stm32f042
static void
hsi48_setup(void)
{
#if CONFIG_MACH_STM32F042
// Enable HSI48
RCC->CR2 |= RCC_CR2_HSI48ON;
while (!(RCC->CR2 & RCC_CR2_HSI48RDY))
;
// Switch system clock to HSI48
RCC->CFGR = RCC_CFGR_SW_HSI48;
while ((RCC->CFGR & RCC_CFGR_SWS_Msk) != RCC_CFGR_SWS_HSI48)
;
// Enable USB clock recovery
if (CONFIG_USBSERIAL) {
enable_pclock(CRS_BASE);
CRS->CR |= CRS_CR_AUTOTRIMEN | CRS_CR_CEN;
}
#endif
}
// Main clock setup called at chip startup
void
clock_setup(void)
@ -132,5 +155,8 @@ clock_setup(void)
FLASH->ACR = (1 << FLASH_ACR_LATENCY_Pos) | FLASH_ACR_PRFTBE;
// Configure main clock
pll_setup();
if (CONFIG_MACH_STM32F042 && CONFIG_STM32_CLOCK_REF_INTERNAL)
hsi48_setup();
else
pll_setup();
}