91 lines
1.6 KiB
C
91 lines
1.6 KiB
C
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#include "delay.h"
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#include "stm32f4xx.h"
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static uint8_t fac_us=0; //us<75><73>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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static uint16_t fac_ms=0; //ms<6D><73>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,<2C><>os<6F><73>,<2C><><EFBFBD><EFBFBD>ÿ<EFBFBD><C3BF><EFBFBD><EFBFBD><EFBFBD>ĵ<EFBFBD>ms<6D><73>
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//<2F><>ʼ<EFBFBD><CABC><EFBFBD>ӳٺ<D3B3><D9BA><EFBFBD>
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//<2F><>ʹ<EFBFBD><CAB9>OS<4F><53>ʱ<EFBFBD><CAB1>,<2C>˺<EFBFBD><CBBA><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><CABC>OS<4F><53>ʱ<EFBFBD>ӽ<EFBFBD><D3BD><EFBFBD>
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//SYSTICK<43><4B>ʱ<EFBFBD>ӹ̶<D3B9>ΪAHBʱ<42>ӵ<EFBFBD>1/8
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//SYSCLK:ϵͳʱ<CDB3><CAB1>Ƶ<EFBFBD><C6B5>
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void delay_init(uint8_t SYSCLK)
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
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fac_us=SYSCLK/8; //<2F><><EFBFBD><EFBFBD><EFBFBD>Ƿ<EFBFBD>ʹ<EFBFBD><CAB9>OS,fac_us<75><73><EFBFBD><EFBFBD>Ҫʹ<D2AA><CAB9>
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fac_ms=(uint16_t)fac_us*1000; //<2F><>OS<4F><53>,<2C><><EFBFBD><EFBFBD>ÿ<EFBFBD><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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//nusΪҪ<CEAA><D2AA>ʱ<EFBFBD><CAB1>us<75><73>.
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//ע<><D7A2>:nus<75><73>ֵ,<2C><>Ҫ<EFBFBD><D2AA><EFBFBD><EFBFBD>798915us(<28><><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5>2^24/fac_us@fac_us=21)
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void delay_us(u32 nus)
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{
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u32 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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}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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//ע<><D7A2>nms<6D>ķ<EFBFBD>Χ
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//SysTick->LOADΪ24λ<34>Ĵ<EFBFBD><C4B4><EFBFBD>,<2C><><EFBFBD><EFBFBD>,<2C><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱΪ:
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//nms<=0xffffff*8*1000/SYSCLK
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//SYSCLK<4C><4B>λΪHz,nms<6D><73>λΪms
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//<2F><>168M<38><4D><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,nms<=798ms
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void delay_ms(uint16_t nms)
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{
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uint32_t temp;
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SysTick->LOAD=(uint32_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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}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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