June 18, 2024, 01:04:00 PM

Interfacing arduino with ADS1220

Started by Lavanya, August 06, 2015, 09:20:53 AM

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Lavanya

Hi All,

Im new here. I want to interface arduino with ADs1220 ADc. Can any one explain me the below arduino code.

Regards,
Lavanya

#include "Protocentral_ADS1220.h"
#include <SPI.h>

#define PGA 1
#define VREF 2.048
#define VFSR VREF/PGA
#define FSR (((long int)1<<23)-1)

volatile byte MSB;
volatile byte data;
volatile byte LSB;
//volatile char SPI_RX_Buff[3];
volatile byte *SPI_RX_Buff_Ptr;

Protocentral_ADS1220 ADS1220;

void setup()
{
  pinMode(ADS1220_CS_PIN, OUTPUT);
  pinMode(ADS1220_DRDY_PIN, INPUT);
 
  ADS1220.begin();
}

void loop()
{
  long int bit32;
  long int bit24;
  byte *config_reg;
 
  //if((digitalRead(ADS1220_DRDY_PIN)) == LOW)             //        Wait for DRDY to transition low
  {
    SPI_RX_Buff_Ptr = ADS1220.Read_Data();
  }

  if(ADS1220.NewDataAvailable = true)
  {
  ADS1220.NewDataAvailable = false;

  MSB = SPI_RX_Buff_Ptr[0];   
  data = SPI_RX_Buff_Ptr[1];
  LSB = SPI_RX_Buff_Ptr[2];

  bit24 = MSB;
  bit24 = (bit24 << 8) | data;
  bit24 = (bit24 << 8) | LSB;                                 // Converting 3 bytes to a 24 bit int
   
  /*if (MSB & 0x80)
    bit32 = (bit24 | 0xFF000000);             // Converting 24 bit two's complement to 32 bit two's complement
  else   
    bit32 = bit24;
  */
 
  bit24= ( bit24 << 8 );
  bit32 = ( bit24 >> 8 );                      // Converting 24 bit two's complement to 32 bit two's complement
 
  float Vout = (float)((bit32*VFSR*1000)/FSR);     //In  mV
 
  delay(300);
 
  Serial.print("Vout in mV : "); 
  Serial.print(Vout);
  Serial.print("  32bit HEX : ");
  Serial.println(bit32,HEX);
 
/*
  config_reg = ADS1220.get_config_reg();

  Serial.print("Config Reg : ");
  Serial.print(config_reg[0],HEX);
  Serial.print(" "); 
  Serial.print(config_reg[1],HEX);
  Serial.print(" ");
  Serial.print(config_reg[2],HEX);
  Serial.print(" ");
  Serial.println(config_reg[3],HEX);
 
  //ADS1220.set_data_rate(DR_1000SPS);
  //ADS1220.set_data_rate(DR_330SPS);
  //ADS1220.set_pga_gain(PGA_GAIN_32);

  Serial.print(MSB,HEX);
  Serial.print(data,HEX);
  Serial.print(LSB,HEX);
 
  Serial.print(vout);
  Serial.print("    ");
  Serial.print(bit32,HEX);
  */
  }
}