Introduction

Analog to Digital Converters (ADC) translate Analog electrical signals for data processing purposes. With products matching performance, power, cost, and size needs, Analog Devices offers the industry’s largest A/D converter portfolio. As the world’s leading provider, these data converters enable accurate and reliable conversion performance in a range of applications such as communications, energy, healthcare, instrumentation and measurement, motor and power control, industrial automation, and aerospace/defence. A variety of A/D converter resources are provided to assist the engineer in every project phase, from product selection to circuit design.

Today in this tutorial, we will see how to read multiple channels in ADC in TMS320F28379D

For this demonstration, I am using TMS320F28379Dcontroller and CCS.

For the ADC purpose, I am using 3 channels as mentioned below:-

  • CHANNEL 0 –> Potentiometer
  • CHANNEL 2 –> Potentiometer
  • CHANNEL 4 –> Potentiometer

ADC Features

  • Each ADC has the following features:
  • Selectable resolution of 12 bits or 16 bits
  • Ratiometric external reference set by VREFHI and VREFLO pins
  • Differential signal conversions (16-bit mode only)
  • Single-ended signal conversions (12-bit mode only)
  • Input multiplexer with up to 16 channels (single-ended) or 8 channels (differential)
  • 16 configurable SOCs
  • 16 individually addressable result registers
  • Multiple trigger sources
    • – S/W – software immediate start
    • – All ePWMs – ADCSOC A or B
    • – GPIO XINT2
    • – CPU Timers 0/1/2 (from each C28x core present)
    • – ADCINT1/2
  • Four flexible PIE interrupts
  • Burst mode
  • Four post-processing blocks, each with:
  • Saturating offset calibration
  • Error from setpoint calculation
  • High, low, and zero-crossing compare, with interrupt and ePWM trip capability
  • Trigger-to-sample delay capture

ADC parametric specification

Resolution

Sampling speed

Input channels

Interface

Precision and General Purpose ADC Finder

High-Speed ADC Finder

Final code

/*
 * mian.c
 *
 *  Created on: 26-Nov-2021
 *      Author: Devilal
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

#include "F2837xD_device.h"
#include "F28x_Project.h"
#include "F2837xD_Examples.h"

#include "driverlib.h"
#include "device.h"

#define     EX_ADC_RESOLUTION       12

void ConfigADC(uint32_t ADC_BASE);
void initADC_SOC(void);

uint16_t Adc_Result_1,Adc_Result_2,Adc_Result_3;
float ADCINA0_1A,ADCINA4_1B,ADCINA2_1C;


void main(void)
{
    Device_init();
    Device_initGPIO();

    Interrupt_initModule();
    Interrupt_initVectorTable();

    ConfigADC(ADCA_BASE);
    initADC_SOC();
    EINT;
    ERTM;

    while(1)
    {
        // Convert, wait for completion, and store results
          ADC_forceSOC(ADCA_BASE, ADC_SOC_NUMBER0);
           ADC_forceSOC(ADCA_BASE, ADC_SOC_NUMBER2);
           ADC_forceSOC(ADCA_BASE, ADC_SOC_NUMBER4);

           while(ADC_getInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1) == false)
               {

               }
           ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);

           ////           // Store results
           Adc_Result_1 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);
           Adc_Result_2 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER4);
           Adc_Result_3 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER2);

           // convert into voltage

//           ADCINA0_1A = Adc_Result_1*(3.3/4096);
//           ADCINA4_1B = Adc_Result_2*(3.3/4096);
//           ADCINA2_1C = Adc_Result_3*(3.3/4096);

           // convert these voltage levels into AMP

           ADCINA0_1A = (Adc_Result_1*(3.3/4096))*100;
          ADCINA4_1B = (Adc_Result_2*(3.3/4096))*100;
          ADCINA2_1C = (Adc_Result_3*(3.3/4096))*100;
    }
}


void ConfigADC(uint32_t ADC_BASE)
{
    EALLOW;

    ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_4_0);

#if(EX_ADC_RESOLUTION == 12)
    {
        ADC_setMode(ADC_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
    }
#elif(EX_ADC_RESOLUTION == 16)
    {
      ADC_setMode(ADCA_BASE, ADC_RESOLUTION_16BIT, ADC_MODE_DIFFERENTIAL);
    }
#endif
    ADC_setInterruptPulseMode(ADC_BASE, ADC_PULSE_END_OF_CONV);
    ADC_enableConverter(ADC_BASE);
    DEVICE_DELAY_US(1000);
    EDIS;
}




void initADC_SOC(void)
{
#if(EX_ADC_RESOLUTION == 12)
    {
        ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN0, 15);
        ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER2, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN2, 15);
        ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER4, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN4, 15);



    }
#elif(EX_ADC_RESOLUTION == 16)
    {
        ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY, ADC_CH_ADCIN0,64);
    }
#endif
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER0);
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER2);
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER4);


    ADC_enableInterrupt(ADCA_BASE, ADC_INT_NUMBER1);

    ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);


}





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