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stm32f0: Initial support for i2c on stm32f0

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2019-11-13 22:20:29 -05:00
parent d39142139e
commit 9ff4f1bb2f
4 changed files with 100 additions and 6 deletions
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10
src/stm32/stm32f0.c
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@ -128,9 +128,12 @@ pll_setup(void)
while ((RCC->CFGR & RCC_CFGR_SWS_Msk) != RCC_CFGR_SWS_PLL)
;
// Select PLL as source for USB clock
// Setup CFGR3 register
uint32_t cfgr3 = RCC_CFGR3_I2C1SW;
if (CONFIG_USBSERIAL)
RCC->CFGR3 = RCC_CFGR3_USBSW;
// Select PLL as source for USB clock
cfgr3 |= RCC_CFGR3_USBSW;
RCC->CFGR3 = cfgr3;
}
// Configure and enable internal 48Mhz clock on the stm32f042
@ -153,6 +156,9 @@ hsi48_setup(void)
enable_pclock(CRS_BASE);
CRS->CR |= CRS_CR_AUTOTRIMEN | CRS_CR_CEN;
}
// Setup I2C1 clock
RCC->CFGR3 = RCC_CFGR3_I2C1SW;
#endif
}