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lijie
2023-12-18 14:36:22 +08:00
commit 0f3cf0952c
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47
Gambal/System/Delay.c Normal file
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#include "delay.h"
/******************************************************************************/
//<2F>ӳ<EFBFBD>nus
void delay_us(unsigned long nus)
{
unsigned long temp;
SysTick->LOAD =nus*9; //9=??72MHz
SysTick->VAL =0;
SysTick->CTRL =SysTick_CTRL_ENABLE_Msk; //HCLK/8
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16)));
SysTick->CTRL=0;
SysTick->VAL =0;
}
/******************************************************************************/
//<2F>ӳ<EFBFBD>nms
//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱʱ<CAB1><CAB1>=0xFFFFFF/9MHz=1864ms
void delay_ms(unsigned short nms)
{
unsigned long temp;
SysTick->LOAD=(u32)nms*9000; //9=??72MHz
SysTick->VAL =0;
SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //HCLK/8
do
{
temp=SysTick->CTRL;
}while((temp&0x01)&&!(temp&(1<<16)));
SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk;
SysTick->VAL =0;
}
/******************************************************************************/
//0xFFFFFF<46><46>0ѭ<30><D1AD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
void systick_CountMode(void)
{
SysTick->LOAD = 0xFFFFFF-1; //set reload register
SysTick->VAL = 0;
SysTick->CTRL = SysTick_CTRL_ENABLE_Msk; //Enable SysTick Timer
}
/******************************************************************************/