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54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
#include "bsp_clock.h"
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static uint8_t fac_us = 0;
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static uint16_t fac_ms = 0;
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//功能：systick初始化
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void BSP_ClockInit(void)
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{
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SysTick_CLKSourceConfig(SysTick_CLKSource_HCLK_Div8); //选择外部时钟 HCLK/8
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fac_us=SystemCoreClock/8000000;//为系统时钟的1/8
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fac_ms = (uint16_t)fac_us*1000;
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}
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//功能：毫秒级延时,最多1864ms
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void Delay_ms(uint32_t nms)
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{
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uint32_t temp = 0;
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SysTick->LOAD=(uint32_t)nms*fac_ms;//时间加载(SysTick->LOAD为24bit)
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SysTick->VAL =0x00; //清空计数器
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
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do
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{
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temp=SysTick->CTRL;
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}
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while( (temp&0x01) && (!(temp&(1<<16))) );//等待时间到达
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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//功能：微秒级延时，最多1800ms
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void Delay_us(uint32_t nus)
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{
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uint32_t temp;
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SysTick->LOAD=nus*fac_us; //时间加载
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SysTick->VAL=0x00; //清空计数器
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SysTick->CTRL|=SysTick_CTRL_ENABLE_Msk ; //开始倒数
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do
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{
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temp=SysTick->CTRL;
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}
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while( (temp&0x01) && (!(temp&(1<<16))) );//等待时间到达
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SysTick->CTRL&=~SysTick_CTRL_ENABLE_Msk; //关闭计数器
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SysTick->VAL =0X00; //清空计数器
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}
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