81 lines
1.5 KiB
C
81 lines
1.5 KiB
C
/*
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HAL_Delay 是阻塞式延时函数,编写自定义延时函数
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*/
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#include "bsp_delay.h"
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#include "main.h"
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static uint8_t fac_us = 0;
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static uint32_t fac_ms = 0;
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void delay_init(void)
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{
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fac_us = SystemCoreClock / 1000000;
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fac_ms = SystemCoreClock / 1000;
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}
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void delay_us(uint16_t nus)
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{
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uint32_t ticks = 0;
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uint32_t told = 0;
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uint32_t tnow = 0;
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uint32_t tcnt = 0;
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uint32_t reload = 0;
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reload = SysTick->LOAD;
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ticks = nus * fac_us;
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told = SysTick->VAL;
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while (1)
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{
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tnow = SysTick->VAL;
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if (tnow != told)
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{
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if (tnow < told)
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{
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tcnt += told - tnow;
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}
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else
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{
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tcnt += reload - tnow + told;
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}
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told = tnow;
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if (tcnt >= ticks)
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{
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break;
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}
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}
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}
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}
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void delay_ms(uint16_t nms)
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{
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uint32_t ticks = 0;
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uint32_t told = 0;
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uint32_t tnow = 0;
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uint32_t tcnt = 0;
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uint32_t reload = 0;
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reload = SysTick->LOAD;
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ticks = nms * fac_ms;
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told = SysTick->VAL;
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while (1)
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{
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tnow = SysTick->VAL;
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if (tnow != told)
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{
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if (tnow < told)
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{
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tcnt += told - tnow;
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}
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else
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{
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tcnt += reload - tnow + told;
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}
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told = tnow;
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if (tcnt >= ticks)
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{
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break;
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}
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}
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}
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}
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