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Merge pull request #1877 from uestczyh222/f4_iic

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[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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Bernard Xiong 2018-10-11 18:51:08 +08:00 committed by GitHub
commit 57303c14be
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1 changed files with 5 additions and 4 deletions
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bsp/stm32f4xx-HAL/drivers/drv_i2c.c
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@ -78,11 +78,12 @@ static rt_int32_t drv_get_scl(void *data)
static void drv_udelay(rt_uint32_t us) static void drv_udelay(rt_uint32_t us)
{ {
int i = (HAL_RCC_GetHCLKFreq() / 4000000 * us); __IO uint32_t Delay = us * (SystemCoreClock / 8U / 1000000U);
while (i) do
{ {
i--; __NOP();
} }
while (Delay --);
} }
static const struct rt_i2c_bit_ops drv_bit_ops = static const struct rt_i2c_bit_ops drv_bit_ops =