player/Project/Src/rt-thread/core_delay.c

#include "main.h"
#include "core_delay.h"






//<2F><>ȡϵͳ<CFB5><CDB3>Ƶ
uint32_t GetSysClocksFreq (void)
{
	RCC_ClocksTypeDef t={0};
	RCC_GetClocksFreq (&t);
	return t.SYSCLK_Frequency;
}











/*
**********************************************************************
* ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ؼĴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
**********************************************************************
*/
/*
<EFBFBD><EFBFBD>Cortex-M <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DWT(Data Watchpoint and Trace)<EFBFBD><EFBFBD>
<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD>32 λ<EFBFBD>ļĴ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>CYCCNT<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ϵļ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
<EFBFBD><EFBFBD>¼<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>еĸ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ܼ<EFBFBD>¼<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>Ϊ<EFBFBD><EFBFBD>
10.74s=2 <EFBFBD><EFBFBD>32 <EFBFBD>η<EFBFBD>/400000000
(<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD>Ƶ<EFBFBD><EFBFBD>Ϊ400M<EFBFBD><EFBFBD><EFBFBD>ں<EFBFBD><EFBFBD><EFBFBD>һ<EFBFBD>ε<EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϊ1/400M=2.5ns)
<EFBFBD><EFBFBD>CYCCNT <EFBFBD><EFBFBD><EFBFBD><EFBFBD>֮<EFBFBD>󣬻<EFBFBD><EFBFBD><EFBFBD>0 <EFBFBD><EFBFBD><EFBFBD>¿<EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD>ϼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
ʹ<EFBFBD><EFBFBD>CYCCNT <EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>IJ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>裺
1<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>DWT <EFBFBD><EFBFBD><EFBFBD>裬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ں˵<EFBFBD><EFBFBD>ԼĴ<EFBFBD><EFBFBD><EFBFBD>DEMCR <EFBFBD><EFBFBD>λ24 <EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>д1 ʹ<EFBFBD><EFBFBD>
2<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>CYCCNT <EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD>֮ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0
3<EFBFBD><EFBFBD>ʹ<EFBFBD><EFBFBD>CYCCNT <EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DWT_CTRL(<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ϻ궨<EFBFBD><EFBFBD>ΪDWT_CR)<EFBFBD><EFBFBD>λ0 <EFBFBD><EFBFBD><EFBFBD>ƣ<EFBFBD>д1 ʹ<EFBFBD><EFBFBD>
*/


#define DWT_CR      *(__IO uint32_t *)0xE0001000
#define DWT_CYCCNT  *(__IO uint32_t *)0xE0001004
#define DEM_CR      *(__IO uint32_t *)0xE000EDFC

#define DEM_CR_TRCENA (1 << 24)
#define DWT_CR_CYCCNTENA (1 << 0)
/**
* @brief <EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* @param <EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD>
* @note ʹ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
*/
HAL_StatusTypeDef HAL_InitTick(uint32_t TickPriority)
{
    /* ʹ<><CAB9>DWT <20><><EFBFBD><EFBFBD> */
    DEM_CR |= (uint32_t)DEM_CR_TRCENA;

    /* DWT CYCCNT <20>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>0 */
    DWT_CYCCNT = (uint32_t)0u;

    /* ʹ<><CAB9>Cortex-M DWT CYCCNT <20>Ĵ<EFBFBD><C4B4><EFBFBD> */
    DWT_CR |= (uint32_t)DWT_CR_CYCCNTENA;

    return HAL_OK;
}

/**
* @brief <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* @param <EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DWT_CYCCNT <EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
*/
uint32_t CPU_TS_TmrRd(void)
{
    return ((uint32_t)DWT_CYCCNT);
}

/**
* @brief <EFBFBD><EFBFBD>ȡ<EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
* @param <EFBFBD><EFBFBD>
* @retval <EFBFBD><EFBFBD>ǰʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>DWT_CYCCNT <EFBFBD>Ĵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
*/
uint32_t HAL_GetTick(void)
{
    return ((uint32_t)DWT_CYCCNT*1000/SysClockFreq);
}

/**
 * @brief   <EFBFBD><EFBFBD><EFBFBD><EFBFBD>CPU <EFBFBD><EFBFBD><EFBFBD>ڲ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʵ<EFBFBD>־<EFBFBD>ȷ<EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD>32 λ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 * @param   us : <EFBFBD>ӳٳ<EFBFBD><EFBFBD>ȣ<EFBFBD><EFBFBD><EFBFBD>λ1 us
 * @retval  <EFBFBD><EFBFBD>
 * @note    ʹ<EFBFBD>ñ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǰ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȵ<EFBFBD><EFBFBD><EFBFBD>CPU_TS_TmrInit <EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʹ<EFBFBD>ܼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
 *          <EFBFBD><EFBFBD>ʹ<EFBFBD>ܺ<EFBFBD>CPU_TS_INIT_IN_DELAY_FUNCTION
 *<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʱֵΪ8 <EFBFBD>룬<EFBFBD><EFBFBD>8*1000*1000
 */
void CPU_TS_Tmr_Delay_US(uint32_t us)
{
    uint32_t ticks;
    uint32_t told, tnow, tcnt=0;

    /* <20>ں<EFBFBD><DABA><EFBFBD><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD>ʼ<EFBFBD><CABC>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD>Ĵ<EFBFBD><C4B4><EFBFBD><EFBFBD><EFBFBD> */
    #if (CPU_TS_INIT_IN_DELAY_FUNCTION)
    /* <20><>ʼ<EFBFBD><CABC>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
    HAL_InitTick(5);
    #endif

    ticks = us * (GET_CPU_ClkFreq() / 1000000); /* <20><>Ҫ<EFBFBD>Ľ<EFBFBD><C4BD><EFBFBD><EFBFBD><EFBFBD> */
    tcnt = 0;
    told = (uint32_t)CPU_TS_TmrRd(); /* <20>ս<EFBFBD><D5BD><EFBFBD>ʱ<EFBFBD>ļ<EFBFBD><C4BC><EFBFBD><EFBFBD><EFBFBD>ֵ */

    while (1) 
    {
        tnow = (uint32_t)CPU_TS_TmrRd();
        if (tnow != told) 
        {
            /* 32 λ<><CEBB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ǵ<EFBFBD><C7B5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> */
            if (tnow > told) 
            {
                tcnt += tnow - told;
            }
            /* <20><><EFBFBD><EFBFBD>װ<EFBFBD><D7B0> */
            else 
            {
                tcnt += UINT32_MAX - told + tnow;
            }

            told = tnow;

            /*ʱ<>䳬<EFBFBD><E4B3AC>/<2F><><EFBFBD><EFBFBD>Ҫ<EFBFBD>ӳٵ<D3B3>ʱ<EFBFBD><CAB1>,<2C><><EFBFBD>˳<EFBFBD> */
            if (tcnt >= ticks)break;
        }
    }
}

/*****************************END OF FILE**********************/