I am having trouble with a anlog to digital converter ads1256 where should I post my code and question?

Hi Josh,

Please post your questions on the SPI interface here and we should be able to help you.  Are these questions also related to your post regarding the ADS1256?

Regards,

Tom Hendrick

Hi Josh,

We may have a few code examples for the ADS1256 running on an MSP430, but we do not have the Arduino development system in our lab.  If you care to post your code and questions here, we'd be happy to try and help!

Tom Hendrick

 
//ads1256 initilisation and read and write to registers in arduino wiring.
#include "ads1256.h"
#include "extera.h"

//define pin names for pin #
#define CS 10 //Chip Select active low on pin 10
#define NEG_RESET 9 //RESET PIN active low on pin 9 on uc
#define DRDY 2 //DATA READY
#define SYNC 8 //syncronisation power down active low
#define DATAOUT 12//MOSI
#define DATAIN  11//MISO
#define SPICLOCK  13//sck

// global variables
int val=0; //a counter
byte clr=0;//used to clear registers to bit trash bin.
int r0=0;//REGISTER CONTAINERS FOR ADC
int r1=0;
int r2=0;
int r3=0;
int r4=0;

//*************************setup for spi to ad
void spi_to_AD_setup(){
  SPCR=0;//clear control register
  clr=SPCR; //coppy spi control register to clr to print out or clear it similar to clearing a status register
  SPSR=0;//clear control register
  clr=SPSR;//coppy spi status register to clr to print out or clear it similar to clearing a status register
clr=SPDR;//coppy spi data register to clr to print out or clear it similar to clearing a status register

  /*SPCR
   SPIE  SPI interrupt disabled set to 0
   SPE - Enables the SPI set to 1
   DORD - most Significant Bit first when set to 0
   MSTR - Sets the Arduino in master mode set to 1
   CPOL - Sets the data clock to be idle when low set to 0
   CPHA - Samples data on the falling edge of the data clock set to 1
   SPR1 and SPR0 - Sets the SPI speed, 00 is fastest (4MHz) 11 is slowest (250KHz) set to 01
   SPSR=0;//makeing shure SPI is not going 2x speed.
   result = 01010011*/
  SPCR = (1<<SPE)|(1<<MSTR)|(1<<CPHA)|(1<<SPR0);
  delay(10);
} //end of initilise spi
//simple spi transfer function char in char out
char spi_transfer(volatile char data)
{
  SPDR = data;                    // Start the transmission
  while (!(SPSR & (1<<SPIF)))     // Wait the end of the transmission
  {
  };
  return SPDR;                    // return the received byte
}

void setup()  {

  // initialize the communication port
  Serial.begin(9600);
  Serial.println("Serial Port Initilised.");

  Serial.println("set pins data direction");
  pinMode(CS,OUTPUT);//10 //Chip Select active low on pin 10
  pinMode(NEG_RESET,OUTPUT); //RESET PIN active low on pin 11
  pinMode(DATAOUT,OUTPUT);// MOSI
  pinMode(DATAIN,INPUT);//DATAIN MISO
  pinMode(SPICLOCK,OUTPUT);// sck
  pinMode(DRDY,INPUT);//Data is ready low
  pinMode(SYNC,OUTPUT);  //sync active low powerdown
  Serial.println("Done seting pins data direction");

  Serial.println("Initilise pins to defalt states");
  digitalWrite(CS,LOW); //enable device
  digitalWrite(SPICLOCK,LOW);//defalt CLOCK NO-RESET state
  digitalWrite(NEG_RESET,HIGH);//defalt reset state
  digitalWrite(SYNC,HIGH);//defalt POWER UP state
  Serial.println("Initiliseed pins to defalt states");

  Serial.println("setup spi port.");
  spi_to_AD_setup();
  Serial.println("spi port setup...");
  Serial.print("SPCR: ");
  Serial.println(SPCR, BIN);
  Serial.print("SPSR: ");
  Serial.println(SPSR, BIN);
 
Serial.println("Reset chip by reset pin"); 
  digitalWrite(NEG_RESET,LOW); //disable device reset self calibration is performed
  delayMicroseconds(33);
  digitalWrite(NEG_RESET,HIGH); //enable device
while((DRDY==0)) //wait for chip to be ready to acsept opcodes
{ 
  Serial.println("waiting");
}
Serial.println("write to register 0-4, DATA=1");
    spi_transfer(CMD_WREG);//write to register opcode
  spi_transfer(6);//6-1 number of registers to write to
  spi_transfer(1);
  spi_transfer(1);
  spi_transfer(1);
  spi_transfer(1);
  spi_transfer(1);
while((DRDY==0)) //wait for chip to be ready to acsept opcodes
{ 
  Serial.println("waiting");
}
   delayMicroseconds(10);//t6 in datasheet wait before reading.
  Serial.println("Read registers 0-4 then print them out");
    spi_transfer(CMD_RREG);//read register command.
    spi_transfer(6);//number of registers to write to -1  
    delayMicroseconds(10);//t6 in datasheet wait before reading.

    r0=spi_transfer(0xFF);
    r1=spi_transfer(0XFF);
    r2=spi_transfer(0XFF);
    r3=spi_transfer(0XFF);
    r4=spi_transfer(0XFF);
    Serial.println(r0, DEC);
    Serial.println(r1, DEC);
    Serial.println(r2, DEC);
    Serial.println(r3, DEC);
    Serial.println(r4, DEC);
}//END OF SETUP

void loop()  {
  val= digitalRead(DRDY);
  if (val==LOW){
  Serial.println("LOW data is ready?");
  }
  if (val==HIGH){
    Serial.println("HIGH data is not ready?");
  }
}//END OF LOOP

 

Hi Tom,

I searched for a link on the TI website for any examples of using the ADS1256 with the MSP430 but couldn't find one. Is there a URL to these examples and if so can you post it here please? I did find the MSP430 code page but didn't find those examples.

I am interested in using the ADS1282 with the MSP430, a different ADC I realise, but hopefully this will help me get started as I have never used either of these devices before.

Regards,

Will.

Hi Will,

Sorry for the delays here - I've been in Asia since the 4th and am only now getting caught up.  I'll be back in Dallas tomorrow night and will send you some example code for the ADS1256 working with the MSP430.

I am working on the ads1298 now ... it is such a interesting replacement for that chip & sections of the design for a EEG / EMG system. Opendous I am working with has a schematic using it on the free kicad software and board designed that is 2 layor.

Can you send some example code for the ADS1256 working with the MSP430 to me?  

asusm6nb@gmail.com

Hello Josh,

I wonder if could share the working code of the ads1256 with arduino.

I tried studying datasheet and writing the code myself, using arduino tutorials, but the code is way out of my league :(

Hello Tom

I write, because I am working with a MSP430F5529 and ads1256 connected but I could not read any data from the port SPI, when I send the comand for obtain the data from SPI output I get nothing, I read in the foro about yo have example yo can share the example please.

ber.andresc@gmail.com

Thanks

Hola Tom

Le wescribo porque estoy trabajando con ads1256 conectado a un MSP430F5529 pero no he podido leer ningun dato de el cuando le envio los comandos de lectura de los registros en la salida del SPI DI no me sale nada

Hi Bernardo,

Can you post a schematic and screen shot of your SPI communication between the ADS1256 and the MSP430F5529?

Hi,TOM!

I am a newer to MSP430 with ADS1256, I see your answers when i searched the TI E2E . Where Can I download the  code examples of ADS1256 running on an MSP430, Or can you send it to me :buaazyj@139.com?

Thanks you very much.

Zhang YJ

Hi Zhang,

Welcome to the TI E2E Forums!

Please reference the following E2E thread for ADS1256 example code:
http://e2e.ti.com/support/data_converters/precision_data_converters/f/73/p/338399/1182307.aspx#1182307

Best Regards,
Chris

Chris,

       Thank you for your kindly help!  I really appreciate for that , Thanks.

Best Wishes,
Zhang YJ