CC2640R2F: Trouble Configuring ADC

Charlie Barber

Part Number: CC2640R2F

I was following the GUI Composer ADC Application Tutorial and am having a difficult time figuring out which pin the ADC values are being read from. In the example code, passed to the ADC_Open() function is Board_ADC0. When I look in the Board.h file and drill down to the ADC0 for my board it shows this

That does not seem to map to any physical pin. I looked through the data sheet, and saw that ADC pins are

However, pin 36 does not match to the pin on the board diagram

over 1 year ago

0 Markel Robregado over 1 year ago

Guru 85695 points

Hi Charlie,

DIO23 is below 3.3V. The picture above is not updated for the CC2640R2F Launchpad. Maybe that is not CC2640R2F Launchpad.

enum CC2640R2_LAUNCHXL_ADCName at CC2640R2_LAUNCHXL.h

/*!
 *  @def    CC2640R2_LAUNCHXL_ADCName
 *  @brief  Enum of ADCs
 */
typedef enum CC2640R2_LAUNCHXL_ADCName {
    CC2640R2_LAUNCHXL_ADC0 = 0,
    CC2640R2_LAUNCHXL_ADC1,
    CC2640R2_LAUNCHXL_ADC2,
    CC2640R2_LAUNCHXL_ADC3,
    CC2640R2_LAUNCHXL_ADC4,
    CC2640R2_LAUNCHXL_ADC5,
    CC2640R2_LAUNCHXL_ADC6,
    CC2640R2_LAUNCHXL_ADC7,
    CC2640R2_LAUNCHXL_ADCDCOUPL,
    CC2640R2_LAUNCHXL_ADCVSS,
    CC2640R2_LAUNCHXL_ADCVDDS,

    CC2640R2_LAUNCHXL_ADCCOUNT
} CC2640R2_LAUNCHXL_ADCName;

The above enum references to this const ADCCC26XX_HWAttrs adcCC26xxHWAttrs[CC2640R2_LAUNCHXL_ADCCOUNT] at CC2640R2_LAUNCHXL.c.

/*
 *  =============================== ADC ===============================
 */
#include <ti/drivers/ADC.h>
#include <ti/drivers/adc/ADCCC26XX.h>

ADCCC26XX_Object adcCC26xxObjects[CC2640R2_LAUNCHXL_ADCCOUNT];

const ADCCC26XX_HWAttrs adcCC26xxHWAttrs[CC2640R2_LAUNCHXL_ADCCOUNT] = {
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO23_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO7,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO24_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO6,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO25_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO5,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO26_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO4,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO27_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO3,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO28_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO2,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO29_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO1,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_2P7_US,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .adcDIO              = CC2640R2_LAUNCHXL_DIO30_ANALOG,
        .adcCompBInput       = ADC_COMPB_IN_AUXIO0,
        .refSource           = ADCCC26XX_FIXED_REFERENCE,
        .samplingDuration    = ADCCC26XX_SAMPLING_DURATION_10P9_MS,
        .inputScalingEnabled = true,
        .triggerSource       = ADCCC26XX_TRIGGER_MANUAL,
        .returnAdjustedVal   = false
    },
    {
        .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   = false
    },
    {
        .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   = false
    },
    {
        .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   = false
    }
};

CC2640R2_LAUNCHXL_ADC0 = CC2640R2_LAUNCHXL_DIO23_ANALOG = IOID_23

I suggest you just debug the adcsinglechannel example program to see the read adc value.

-kel

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CC2640R2F: Trouble Configuring ADC