CC2650采集电压的时候，发现比真实电压大了0.6V

user1388075

Other Parts Discussed in Thread: CC2650

static const ADCCC26XX_HWAttrs s_adcCC26XXHWAttrs[BOARD_ADCCOUNT] =
{
{
.adcDIO = BATTERY_ADC_IO, // DIO_6
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL,
//.returnAdjustedVal = 0
},

ADCCC26XX_FIXED_REFERENCE 用的是内部参考电压1.44v

计算公式，4.3是采样倍率

VBAT = ADC_Read() / 4096.0*1.44 * 4.3;

,管脚也是对的啊，ADC_COMPB_IN_AUXIO7这个参数干嘛用的？

3 年多前

0 user1388075 3 年多前

Genius 5280 points

用的4*4的芯片的IOD6 作为电压采集输入。

这是我完整的驱动代码，调用的是adc_read

/*********************************************************************
 * INCLUDES
 */
#include "_hal_types.h"
#include <ti/drivers/adc/ADCCC26XX.h>
#include <ti/drivers/pin/PINCC26XX.h>
#include <driverlib/aux_adc.h>
#include <driverlib/aux_wuc.h>

#include "drv_adc.h"

/*********************************************************************
 * LOCAL VARIABLES
 */
static ADCCC26XX_Object s_adcCC26XXObject[BOARD_ADCCOUNT];

static const ADCCC26XX_HWAttrs s_adcCC26XXHWAttrs[BOARD_ADCCOUNT] =
{
    {
         .adcDIO = BATTERY_ADC_IO,  // DIO_6
         .adcCompBInput = ADC_COMPB_IN_AUXIO7,
         .refSource = ADCCC26XX_FIXED_REFERENCE,
         .samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
         .inputScalingEnabled = true,
         .triggerSource = ADCCC26XX_TRIGGER_MANUAL,
         //.returnAdjustedVal = 0
    },
    {
         .adcDIO = PIN_UNASSIGNED,
         .adcCompBInput = ADC_COMPB_IN_DCOUPL,
         .refSource = ADCCC26XX_FIXED_REFERENCE,
         .samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
         .inputScalingEnabled = true,
         .triggerSource = ADCCC26XX_TRIGGER_MANUAL,
         //.returnAdjustedVal = 0
    },
    {
         .adcDIO = PIN_UNASSIGNED,
         .adcCompBInput = ADC_COMPB_IN_VSS,
         .refSource = ADCCC26XX_FIXED_REFERENCE,
         .samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
         .inputScalingEnabled = true,
         .triggerSource = ADCCC26XX_TRIGGER_MANUAL,
        //.returnAdjustedVal = 0
    },
    {
         .adcDIO = PIN_UNASSIGNED,
         .adcCompBInput = ADC_COMPB_IN_VDDS,
         .refSource = ADCCC26XX_FIXED_REFERENCE,
         .samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
         .inputScalingEnabled = true,
         .triggerSource = ADCCC26XX_TRIGGER_MANUAL,
        // .returnAdjustedVal = 0
    }
};

static const ADC_Config s_adcConfig[BOARD_ADCCOUNT] =
{
    {
         &ADCCC26XX_fxnTable,
         &s_adcCC26XXObject[BOARD_ADCCHANNEL7],
         &s_adcCC26XXHWAttrs[BOARD_ADCCHANNEL7]
    },
    {
         &ADCCC26XX_fxnTable,
         &s_adcCC26XXObject[BOARD_ADCDCOUPL],
         &s_adcCC26XXHWAttrs[BOARD_ADCDCOUPL]
    },
    {
         &ADCCC26XX_fxnTable,
         &s_adcCC26XXObject[BOARD_ADCVSS],
         &s_adcCC26XXHWAttrs[BOARD_ADCVSS]
    },
    {
         &ADCCC26XX_fxnTable,
         &s_adcCC26XXObject[BOARD_ADCVDDS],
         &s_adcCC26XXHWAttrs[BOARD_ADCVDDS]
    },
};

// ADC句柄及参数
static ADC_Handle s_adcHandle;
static ADC_Params s_adcParams;

/*********************************************************************
 * PUBLIC FUNCTIONS
 */
/**
 @brief ADC的初始化函数
 @param 无
 @return 无
*/
void ADC_Init(void)
{
    ADC_Params_init(&s_adcParams);
    //s_adcParams.isProtected = TRUE;
    s_adcConfig[BOARD_ADCCHANNEL7].fxnTablePtr->closeFxn((ADC_Handle)&s_adcConfig[BOARD_ADCCHANNEL7]);
    s_adcHandle = s_adcConfig[BOARD_ADCCHANNEL7].fxnTablePtr->openFxn((ADC_Handle)&s_adcConfig[BOARD_ADCCHANNEL7],&s_adcParams);
}

/**
 @brief ADC读取
 @param 无
 @return 读取电压值
*/
uint16 ADC_Read(void)
{
    uint16 adcResult;
    s_adcConfig[BOARD_ADCCHANNEL7].fxnTablePtr->convertFxn(s_adcHandle, &adcResult);
    return adcResult;
}

/**
 @brief ADC短暂读取
 @param 无
 @return 读取电压值
*/
uint32 Adc_OneShotRead(void)
{
    AUXWUCClockEnable(AUX_WUC_MODCLKEN0_ANAIF_M | AUX_WUC_MODCLKEN0_AUX_ADI4_M);
    AUXADCSelectInput(ADC_COMPB_IN_AUXIO7);
    AUXADCEnableSync(AUXADC_REF_FIXED, AUXADC_SAMPLE_TIME_2P7_US, AUXADC_TRIGGER_MANUAL);
    AUXADCGenManualTrigger();
    uint32 adcValue = AUXADCReadFifo();
    AUXADCDisable();
    return adcValue;
}

/**
@brief 关闭ADC
@param 无
@return 无
*/
void ADC_Close()
{
	AUXADCDisable();
}

0 YiKai Chen 3 年多前

Guru 109500 points

直接用ADC_convertRawToMicroVolts就好

0 Kevin Qiu1 3 年多前回复 user1388075

TI__Guru* 82220 points

ADC_COMPB是ADC比较器，具体请看这里17节：www.ti.com.cn/.../swcu117i.pdf
你用的是哪个例程

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

我接的是IO6 应该选哪个

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

你腳位設置內容不大對，請你參考一下 CC2650_LAUNCHXL.c/CC2650_LAUNCHXL.h，接的是IO6的話可以把CC2650_LAUNCHXL.h的"#define Board_DIO23_ANALOG IOID_23"改成"#define Board_DIO23_ANALOG IOID_6"應該就可以

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

1、我的做法：
我用的是DIO_6和ADC_COMPB_IN_AUXIO7;
{
.adcDIO = BATTERY_ADC_IO, // DIO_6
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL,
//.returnAdjustedVal = 0
},

2、lauchxl例程中的做法：
const ADCCC26XX_HWAttrs adcCC26xxHWAttrs[CC2650_LAUNCHXL_ADCCOUNT] = {
{
.adcDIO = Board_DIO23_ANALOG,
.adcCompBInput = ADC_COMPB_IN_AUXIO7,
.refSource = ADCCC26XX_FIXED_REFERENCE,
.samplingDuration = ADCCC26XX_SAMPLING_DURATION_2P7_US,
.inputScalingEnabled = true,
.triggerSource = ADCCC26XX_TRIGGER_MANUAL
},

按照你的意思，Board_DIO23_ANALOG改成DIO_6，ADC_COMPB_IN_AUXIO7不用变就行？

总结：
1中我的做法，和你说的2中的做法是一致的啊。

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

是的、Board_DIO23_ANALOG改成DIO_6，ADC_COMPB_IN_AUXIO7不用变就行

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

参考电压是1.44么，我的程序和例程配置一样的啊。

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

参考电压是4.3V

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

参考电压不是FIXED么，144v啊，数据表上写的啊。

我的电压是3.2V，读取出的adc原始值是3100附近，而且两个电路板采样电阻都不一样，读出的原始值差不多

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

ADC driver預設的參考電壓是4.3V，你可以參考一下的討論，所以 4.3x3100/4096=3.25439453125，基本上你讀值是對的

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

但是ADC的采样点是从电池2分之一分压过来的啊，一计算电池电压6.4V

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

你要不要先用power supply輸入不同電壓到ADC的采样点，先測試看看能不能正確讀取電壓

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

嗯这个可以试一下

那ADCCC26XX_FIXED_REFERENCE 这个参考电压到底是1.44V呢还是4.1V？

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

是4.3V

0 user1388075 3 年多前回复 YiKai Chen

Genius 5280 points

手册里面一个1.44,一个4.3，怎么选的

0 YiKai Chen 3 年多前回复 user1388075

Guru 109500 points

TI driver裡面用的是4.3V

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CC2650采集电压的时候，发现比真实电压大了0.6V