Merge pull request #1877 from uestczyh222/f4_iic
[Bsp][stm32f4xx-hal]修复I2C在开启优化时出现延时异常的问题
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commit
57303c14be
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@ -78,11 +78,12 @@ static rt_int32_t drv_get_scl(void *data)
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static void drv_udelay(rt_uint32_t us)
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{
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int i = (HAL_RCC_GetHCLKFreq() / 4000000 * us);
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while (i)
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__IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);
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do
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{
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i--;
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}
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__NOP();
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}
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while (Delay --);
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}
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static const struct rt_i2c_bit_ops drv_bit_ops =
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