[stm32f10x-HAL] add function rt_hw_us_delay
实现rt_hw_us_delay函数
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@ -113,3 +113,23 @@ void rt_hw_board_init(void)
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rt_console_set_device(RT_CONSOLE_DEVICE_NAME);
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#endif
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}
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/**
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* This function will delay for some us.
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*
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* @param us the delay time of us
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*/
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void rt_hw_us_delay(rt_uint32_t us)
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{
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rt_uint32_t delta;
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us = us * (SysTick->LOAD / (1000000 / RT_TICK_PER_SECOND));
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delta = SysTick->VAL;
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if (delta < us)
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{
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/* wait current OSTick left time gone */
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while (SysTick->VAL < us);
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us -= delta;
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delta = SysTick->LOAD;
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}
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while (delta - SysTick->VAL < us);
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}
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