93 lines
1.6 KiB
C
93 lines
1.6 KiB
C
#include "delay.h"
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#include "sys.h"
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/*
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//roughly delay
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void delay_us(u32 nus)
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{
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u32 i;
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u16 temp;
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temp = nus*SYS_CLK/15;
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for(i=0;i<temp;i++);
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}
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//延时nms
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//nms:要延时的ms数
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void delay_ms(u16 nms)
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{
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u32 i;
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for(i=0;i<nms;i++) delay_us(1000);
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}
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*/
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void delay_init(void)
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{
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HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);
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/* Configure the SysTick to have interrupt in 1ms time basis*/
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HAL_SYSTICK_Config(SystemCoreClock / (1000U / uwTickFreq));
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}
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#if OS_SUPPORT
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void delay_us(u32 nus)
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{
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u32 ticks;
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u32 told,tnow,tcnt=0;
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u32 reload=SysTick->LOAD;
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ticks=nus*SYS_CLK;
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delay_osschedlock();
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told=SysTick->VAL;
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while(1)
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{
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tnow=SysTick->VAL;
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if(tnow!=told)
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{
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if(tnow<told)tcnt+=told-tnow;//这里注意一下SYSTICK是一个递减的计数器就可以了.
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else tcnt+=reload-tnow+told;
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told=tnow;
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if(tcnt>=ticks)break;
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}
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};
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delay_osschedunlock();
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}
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void delay_ms(u16 nms)
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{
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if(delay_osrunning&&delay_osintnesting==0)
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{
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if(nms>=fac_ms)
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{
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delay_ostimedly(nms/fac_ms);
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}
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nms%=fac_ms;
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}
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delay_us((u32)(nms*1000));
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}
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#else
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void delay_us(u32 nus)
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{
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u32 ticks;
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u32 told,tnow,tcnt=0;
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u32 reload=SysTick->LOAD;
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ticks=nus*SYS_CLK;
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told=SysTick->VAL;
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while(1)
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{
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tnow=SysTick->VAL;
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if(tnow!=told)
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{
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if(tnow<told)tcnt+=told-tnow;
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else tcnt+=reload-tnow+told;
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told=tnow;
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if(tcnt>=ticks)break;
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}
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}
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}
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void delay_ms(u16 nms)
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{
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u32 i;
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for(i=0;i<nms;i++) delay_us(1000);
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}
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#endif
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