65 lines
1.2 KiB
C
65 lines
1.2 KiB
C
#include "Bsp.h"
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#define DEM_CR *(volatile u32 *)0xE000EDFC
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#define DWT_CR *(volatile u32 *)0xE0001000
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#define DWT_CYCCNT *(volatile u32 *)0xE0001004
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#define DEM_CR_TRCENA (1 << 24)
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#define DWT_CR_CYCCNTENA (1 << 0)
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/**
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* @brief 初始化延时函数
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* @param void
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* @retval void
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* @note void
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* @example void
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*/
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void DelayConfig(void)
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{
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DEM_CR |= DEM_CR_TRCENA;
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DWT_CR |= DWT_CR_CYCCNTENA;
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DWT_CYCCNT = 0;
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}
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/**
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* @brief 读取DWT计数器的值
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* @param void
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* @retval void
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* @note void
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* @example void
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*/
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unsigned int DwtCntGet(void)
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{
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return((uint32_t)DWT_CYCCNT);
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}
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/**
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* @brief 微秒级延时函数
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* @param void
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* @retval void
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* @note void
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* @example void
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*/
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void DelayUs(unsigned int Us)
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{
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uint32_t Start = 0,End = 0,Ts = 0;
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Start = DwtCntGet();
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Ts = Us * (SystemCoreClock / 1000000U);
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End = Start + Ts;
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while(DwtCntGet() < End){;}
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}
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/**
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* @brief 毫秒级延时函数
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* @param void
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* @retval void
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* @note void
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* @example void
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*/
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void DelayMs(unsigned int Ms)
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{
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DelayUs(Ms * 1000);
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}
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