WINCE60 AD转换函数

最新推荐文章于 2020-05-17 21:48:27 发布

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本文深入探讨了如何使用预缩放技术优化ADC采样频率，实现精准数据获取。通过设置预缩放值，调整ADC时钟频率，确保在特定采样周期内完成转换，从而提高数据读取的准确性与效率。

int ReadAdc(BYTE ch)
{
    DWORD preScaler;
    DWORD ADCCON_save = g_pADCReg_bat->ADCCON;
    int iRet =50;
    int i;
    //DEBUGCHK(v_pIOPregs!=NULL);
    if(ghBattTouchMutex )
    {
        WaitForSingleObject(ghBattTouchMutex, MUTEX_TIMEOUT);
    }
    preScaler = 49; //A/D converter freq = PCLK/(prescaler+1),这个值是根据你采样频率来设置。
    g_pADCReg_bat->ADCCON = (1<<14)|(preScaler<<6)|(ch<<3); //enable prescaler,set channel}

    for(i = 0;i<500;i++); //delay to set up the channel

    g_pADCReg_bat->ADCCON |= 0x1;   //start ADC

    while(g_pADCReg_bat->ADCCON & 0x1);   //check if Enable_start is low
    while(!(g_pADCReg_bat->ADCCON&0x8000));   //check if EC(End of Conversion) flag is high
    iRet = (int)g_pADCReg_bat->ADCDAT0 & 0x3ff;
    g_pADCReg_bat->ADCCON = ADCCON_save;
    if(ghBattTouchMutex)
    {
        ReleaseMutex(ghBattTouchMutex);
    }
    return iRet;

}