2020-12-19 09:26:30 +08:00
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#include "delay.h"
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2020-12-19 10:57:22 +08:00
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#include "rtthread.h"
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2020-12-19 09:26:30 +08:00
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#include "stm32f10x.h"
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2020-12-19 10:57:22 +08:00
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void rt_hw_us_delay(unsigned int us)
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2020-12-19 09:26:30 +08:00
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{
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2020-12-19 10:57:22 +08:00
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rt_uint32_t delta, current_delay, tick;
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2020-12-19 17:48:14 +08:00
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if(us == 0)
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return;
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2020-12-19 10:57:22 +08:00
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>tick<63><6B>
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tick = us * (SysTick->LOAD/(1000000/RT_TICK_PER_SECOND));
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//<2F><><EFBFBD>õ<EFBFBD>ǰʱ<C7B0><CAB1>
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delta = SysTick->VAL;
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//ѭ<><D1AD><EFBFBD><EFBFBD><EFBFBD>õ<EFBFBD>ǰʱ<C7B0>䣬ֱ<E4A3AC><D6B1><EFBFBD>ﵽָ<EFB5BD><D6B8>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>˳<EFBFBD>ѭ<EFBFBD><D1AD>
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do
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{
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if(delta > SysTick->VAL)
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{
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current_delay = delta - SysTick->VAL;
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}
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else
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{
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//<2F><>ʱ<EFBFBD><CAB1>Խ<EFBFBD><D4BD>һ<EFBFBD><D2BB>OS tick<63>ı߽<C4B1>
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current_delay = SysTick->LOAD + delta - SysTick->VAL;
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}
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}while(current_delay < tick);
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2020-12-19 09:26:30 +08:00
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}
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