40 lines
851 B
C
40 lines
851 B
C
#include "sys.h"
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static u8 fac_us=0; //us?????
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static u16 fac_ms=0; //ms?????
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void delay_init(u8 SYSCLK)
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);
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fac_us=SYSCLK/8;
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fac_ms=(u16)fac_us*1000;
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}
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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;
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SysTick->VAL=0x00;
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;
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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)));
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL =0X00;
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}
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void delay_ms(u16 nms)
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{
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u32 temp;
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SysTick->LOAD=(u32)nms*fac_ms;
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SysTick->VAL =0x00;
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ;
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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)));
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;
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SysTick->VAL =0X00;
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}
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