ADS1256evm

Hakim,

Could you let us know your register settings and your command sequence? Otherwise it is hard to decide what is going on.

Regards,

Richard

Dear Richard,

Thank you for your email.

Here is my command sequence :

#include "stdio.h"

#include "stdlib.h"

#include "unistd.h"

#include "sys/ioctl.h"

#include "fcntl.h"

#include "time.h"

#include "string.h"

#include "linux/gpio_syscalls.h"

#define DIN_HI gpiosetbits(PORTG,PG1)      //data in pin, used to command the CAN

#define DIN_LO gpioclearbits(PORTG,PG1)

#define RST_LO gpioclearbits(PORTG,PG3)//reset

#define RST_HI gpiosetbits(PORTG,PG3) 

#define SCK_HI gpiosetbits(PORTG,PG2)      //serial clock, used to clock data on DOUT

#define SCK_LO gpioclearbits(PORTG,PG2)

#define CS_LO gpioclearbits(PORTG,PG4)

#define DGND gpioclearbits(PORTG,PG5)

#define DOUT gpiogetbits(PORTG,PG8)      //data out pin, from 800000h to 7FFFFFh

#define DRDY gpiogetbits(PORTG, PG10)      //data ready signal, goes low when the data is available

void SPI_write(unsigned char);

void SPI_init(void)

{

      CS_LO;       //Garder le chip select sur niveau bas

      DGND;

      RST_LO;

      sleep(1);

      RST_HI;

      SCK_LO;

      DIN_LO;

      SPI_write(0x53);              // 1st command byte : 5=write to register, 3=register Data Rate

      SCK_HI;

      SCK_LO;

      SPI_write(0x00);             

      SCK_HI;

      SCK_LO;

      SPI_write(0xB0);              // Data Rate setting : 2,000 SPS (cf p.32)

      SCK_HI;

      SCK_LO;

      if (DRDY==0)

      {

            SPI_write(0x03);         // Read data continously (cf p.34)  

      }

      SCK_HI;

      SCK_LO;

}

//Write a byte to the CAN

void SPI_write (unsigned char value)

{

      int i;

      for (i=7;i>=0;i--)

      {

            if (value&(1<<i))

            {

                  DIN_HI;

            } 

            else

            {

                  DIN_LO;

            }

            SCK_HI;

            SCK_LO;

      }

}

//Read a byte from the CAN

static long int Readbyte()

{

      long int tempbyte;

      int k;

      tempbyte=0;

      for (k=0x800000; k>0;k/=2)

      {

            SCK_HI;

            if (DRDY==0)

                  tempbyte|=DOUT;

            SCK_LO;

      }

      return tempbyte;

}

int main (int argc, int **argv)

{

SPI_write(0xAB);

sleep(30);              // Attente de 30 secondes pour être en régime

// permanent

printf("initialisation du CAN en cours...");

SPI_init();

long int result[96001];

int i;

FILE* f;

f=fopen("/tmp/test.txt", "w");

for (i=0; i<=96000;i++)

{

result[i]=Readbyte();

      fprintf (f, "%d", result[i]);

      fprintf (f, "\n");

}

fclose(f);

printf("fin de la conversion");

return(0);

}