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Merge pull request #6877 from steffen-p/stm32_clk_init_hse_i2c

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cpu/stm32f3: fix for non-functional i2c
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Alexandre Abadie 2017-04-14 18:48:55 +02:00 committed by GitHub
commit 3e0edad466
1 changed files with 10 additions and 0 deletions
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10
cpu/stm32f3/cpu.c
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@ -140,5 +140,15 @@ static void cpu_clock_init(void)
/* disable the HSI if we use the HSE */ /* disable the HSI if we use the HSE */
RCC->CR &= ~(RCC_CR_HSION); RCC->CR &= ~(RCC_CR_HSION);
while (RCC->CR & RCC_CR_HSIRDY) {} while (RCC->CR & RCC_CR_HSIRDY) {}
/* swith I2Cx clock source to SYSCLK */
RCC->CFGR3 &= ~(RCC_CFGR3_I2CSW);
RCC->CFGR3 |= RCC_CFGR3_I2C1SW_SYSCLK;
#ifdef RCC_CFGR3_I2C2SW_SYSCLK
RCC->CFGR3 |= RCC_CFGR3_I2C2SW_SYSCLK;
#endif
#ifdef RCC_CFGR3_I2C3SW_SYSCLK
RCC->CFGR3 |= RCC_CFGR3_I2C3SW_SYSCLK;
#endif
#endif #endif
} }