bathfire
39 lines
821 B
C
39 lines
821 B
C
#include "config.h" //全局声明
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void delay_init(void)
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8);//用于配置延时函数
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}
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//延时函数：毫秒级别
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void delay_ms(uint32_t nms)
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{
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uint32_t tmp;
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while(nms--)
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{
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SysTick->LOAD = 168000000/8/1000; //计数初值，延时1ms
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SysTick->VAL = 0; //清空当前值
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SysTick->CTRL |= 0x1; //开始计数
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while ((SysTick->CTRL & 0x00010000)==0);
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SysTick->VAL = 0; //清空当前值
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SysTick->CTRL &= 0; //关闭计数
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}
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}
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//延时函数：微秒级别
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void delay_us(uint32_t nus)
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{
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uint32_t tmp;
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while(nus--)
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{
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SysTick->LOAD = 168000000/8/1000000; //计数初值，延时1us
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SysTick->VAL = 0; //清空当前值
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SysTick->CTRL |= 0x1; //开始计数
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while ((SysTick->CTRL & 0x00010000)==0);
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SysTick->VAL = 0; //清空当前值
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SysTick->CTRL &= 0; //关闭计数
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}
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}
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