43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
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#include "delay.h"
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static int8_t fac_us=0;//us
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static int16_t fac_ms=0;//ms
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void delay_init()
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);//ѡ<><D1A1><EFBFBD>ⲿʱ<E2B2BF><CAB1> HCLK/8
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fac_us=SystemCoreClock/8000000; //Ϊϵͳʱ<CDB3>ӵ<EFBFBD>1/8
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fac_ms=(int16_t)fac_us*1000;//ÿ<><C3BF>ms<6D><73>Ҫ<EFBFBD><D2AA>systickʱ<6B><CAB1><EFBFBD><EFBFBD>
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}
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//<2F><>ʱNus
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void delay_us(int32_t nus)
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{
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int32_t temp;
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SysTick->LOAD=nus*fac_us; //ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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SysTick->VAL=0x00; //<2F><><EFBFBD>ռ<EFBFBD><D5BC><EFBFBD><EFBFBD><EFBFBD>
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>
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do
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{
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temp=SysTick->CTRL;
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}
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while(temp&0x01&&!(temp&(1<<16)));//<2F>ȴ<EFBFBD>ʱ<EFBFBD>䵽<EFBFBD><E4B5BD>
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //<2F>رռ<D8B1><D5BC><EFBFBD><EFBFBD><EFBFBD>
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SysTick->VAL =0X00; //<2F><><EFBFBD>ռ<EFBFBD><D5BC><EFBFBD><EFBFBD><EFBFBD>
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}
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//<2F><>ʱNms
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void delay_ms(int16_t nms)
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{
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int32_t temp;
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SysTick->LOAD=(int32_t)nms*fac_ms;//ʱ<><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>(SysTick->LOADΪ24bit)
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SysTick->VAL =0x00; //<2F><><EFBFBD>ռ<EFBFBD><D5BC><EFBFBD><EFBFBD><EFBFBD>
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //<2F><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>
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do
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{
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temp=SysTick->CTRL;
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}
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while(temp&0x01&&!(temp&(1<<16)));//<2F>ȴ<EFBFBD>ʱ<EFBFBD>䵽<EFBFBD><E4B5BD>
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //<2F>رռ<D8B1><D5BC><EFBFBD><EFBFBD><EFBFBD>
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SysTick->VAL =0X00; //<2F><><EFBFBD>ռ<EFBFBD><D5BC><EFBFBD><EFBFBD><EFBFBD>
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}
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