[学习笔记] AC7811获取内部Tsensor温度的方法

#include "ac78xx.h"

#include "ac78xx_adc.h"

uint32_t ADC_Average(uint32_t *uADC_Value, uint32_t num)

{

    uint32_t Max, Min, AVERAGE, SUM, j;

    Max = uADC_Value[0];

    Min = uADC_Value[0];

    SUM = 0;

    AVERAGE = 0;

    j = 0;



    for (j = 0; j < num; j++)

    {

        SUM += uADC_Value[j];

        if(uADC_Value[j] > Max)

        {

            Max = uADC_Value[j];

        }

        else if (uADC_Value[j] < Min)

        {

            Min = uADC_Value[j];

        }

    }

    SUM = SUM - Max - Min;

    AVERAGE = SUM / (num - 2);

    return(AVERAGE);

}





uint32_t bandGapAVG = 0;

uint32_t bandGapTmp[8];

uint32_t adcVal = 0;

uint8_t bIndex = 0;

float bgVol = 0.0;

float vt25Vol = 0.0;

float vt25Temprature = 0.0;

float referVol = 0.0, TsensorVol = 0.0;

float g_temperatureVal = 0.0;





uint32_t TsensorCali = 0;

uint8_t VbandgapRT = 0;

uint8_t VtsensorRT = 0;

uint8_t RTERR = 0;



#define TSENSOR_CALI_ENABLE

float ADC_GetTemperature(void)

{

    ADC_InitType tempAdcConfig = {0, 0, 0, 0, 0, 0, 0};

    ADC_TrigSourceType tempAdcTrigSource = {0, 0};

    ADC_InitType* adcConfig;

    ADC_TrigSourceType* adcTrigSource;

    float temperatureVal = 0.0;

  

    adcConfig = &tempAdcConfig;

    adcTrigSource = &tempAdcTrigSource;

    adcConfig->scanMode = 0;

    adcConfig->continousMode = 0;

    adcConfig->disContinousModeOnRegularGroup = 0;

    adcConfig->disContinousModeOnInjectGroup = 0;

    adcConfig->injectAutoMode = 0;

    ADC_Init(ADC, adcConfig);

    ADC_SetClockPrescaler(ADC, 7);

    ADC_TrigSourceInit(ADC, adcTrigSource);

    ADC_SetRegularGroupLength(ADC, 1);

    ADC_SetRegularGroupSequence(ADC, 1, ADC_CHANNEL_AD16_BANDGAP); ///set ADC_CHANNEL_AD16_BANDGAP for AD Sample

    ADC_ChannelSampleTimeSel(ADC, ADC_CHANNEL_AD16_BANDGAP, ADC_SampleTime_215Cycle);

    ADC_Cmd(ADC, ADC_ENABLE);



#ifdef TSENSOR_CALI_ENABLE

    TsensorCali = *((uint32_t*)0x40003050);

    VbandgapRT = (uint8_t)(TsensorCali & 0x1F);

    VtsensorRT = (uint8_t)((TsensorCali >> 5) & 0xFF);

    RTERR = (uint8_t)((TsensorCali >> 13) & 0x3F);

    printf("[ADC]TsensorCali is %u %u %u %u\r\n", TsensorCali, VbandgapRT, VtsensorRT, RTERR);



    /* BG calibration */

    if (VbandgapRT >> 4)

    {

        bgVol = 1200 - (VbandgapRT & 0xF);

    }

    else

    {

        bgVol = 1200 + (VbandgapRT & 0xF);

    }



    /* Vtsensor calibration */

    if (VtsensorRT >> 7)

    {

        vt25Vol = 720 - (VtsensorRT & 0x7F) * 0.5;

    }

    else

    {

        vt25Vol = 720 + (VtsensorRT & 0x7F) * 0.5;

    }



    /* Temperature calibration */

    if (RTERR >> 5)

    {

        vt25Temprature = 25 - (RTERR & 0x0F) * 0.5;

    }

    else

    {

        vt25Temprature = 25 + (RTERR & 0x0F) * 0.5;

    }  

#else

    bgVol   = 1200;

    vt25Vol = 720;

    vt25Temprature = 25;

#endif



    for (bIndex = 0; bIndex < 8; bIndex++)

    {

         ADC_SoftwareStartRegularConvCmd(ADC, 1);

         while (!ADC_GetIntFlag(ADC, ADC_FLAG_EOC));

         bandGapTmp[bIndex] = ADC_GetRegularConversionValue(ADC);

    }

    

    bandGapAVG = ADC_Average(bandGapTmp , 8);



    referVol = 4096.0 * bgVol / bandGapAVG;

    

    ADC_SetRegularGroupSequence(ADC, 1, ADC_CHANNEL_AD17_TEMPSENSOR);

    ADC_ChannelSampleTimeSel(ADC, ADC_CHANNEL_AD17_TEMPSENSOR, ADC_SampleTime_215Cycle);

    udelay(5);



    ADC_SoftwareStartRegularConvCmd(ADC, ADC_ENABLE);

    while (!ADC_GetIntFlag(ADC, ADC_FLAG_EOC));

    adcVal = ADC_GetRegularConversionValue(ADC);

    TsensorVol = (adcVal / 4096.0) * referVol;

    temperatureVal = (vt25Vol - TsensorVol) / 1.629 + vt25Temprature;

    

    printf("[ADC]Tsensor temperature:%f\r\n", temperatureVal);

    return temperatureVal;

}