48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
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#include "delay.h"
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/******************************************************************************/
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//<2F>ӳ<EFBFBD>nus
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void delay_us(unsigned long nus)
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{
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unsigned long temp;
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SysTick->LOAD =nus*9; //9=??72MHz
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SysTick->VAL =0;
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SysTick->CTRL =SysTick_CTRL_ENABLE_Msk; //HCLK/8
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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=0;
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SysTick->VAL =0;
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}
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/******************************************************************************/
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//<2F>ӳ<EFBFBD>nms
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱʱ<CAB1><CAB1>=0xFFFFFF/9MHz=1864ms
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void delay_ms(unsigned short nms)
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{
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unsigned long temp;
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SysTick->LOAD=(u32)nms*9000; //9=??72MHz
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SysTick->VAL =0;
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //HCLK/8
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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 =0;
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}
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/******************************************************************************/
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//0xFFFFFF<46><46>0ѭ<30><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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void systick_CountMode(void)
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{
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SysTick->LOAD = 0xFFFFFF-1; //set reload register
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SysTick->VAL = 0;
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SysTick->CTRL = SysTick_CTRL_ENABLE_Msk; //Enable SysTick Timer
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}
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/******************************************************************************/
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