here is the Init. of my 24 bit analog to digital converter

here is the Init. of my 24 bit analog to digital converter please check it out and review the pc eeg project could use YOUR help.

#include “ads1256.h”

//pin defines

//**************************** data lines

#define NEG_CHIP_SELECT 10 //Chip Select active low on pin 10

#define NEG_RESET 11 //RESET PIN active low on pin 11

//EEPROM Example

#define DATAOUT 14//MOSI

#define DATAIN 12//MISO

#define SPICLOCK 13//sck

#define SLAVESELECT 10//ss //this is redundant I am merging tutorials and need to decide on one…

//************************ end data lines definition

//*****************************

// global variables

//less efficent gain list but more straight forward

char g_Channel_0=(ADS1256_MUXP_AIN0 | ADS1256_MUXN_AINCOM);

char g_Channel_1=(ADS1256_MUXP_AIN1 | ADS1256_MUXN_AINCOM);

char g_Channel_2=(ADS1256_MUXP_AIN2 | ADS1256_MUXN_AINCOM);

char g_Channel_3=(ADS1256_MUXP_AIN3 | ADS1256_MUXN_AINCOM);

char g_Channel_4=(ADS1256_MUXP_AIN4 | ADS1256_MUXN_AINCOM);

char g_Channel_5=(ADS1256_MUXP_AIN5 | ADS1256_MUXN_AINCOM);

char g_Channel_6=(ADS1256_MUXP_AIN6 | ADS1256_MUXN_AINCOM);

char g_Channel_7=(ADS1256_MUXP_AIN7 | ADS1256_MUXN_AINCOM);

char g_Gain=ADS1256_GAIN_1;//gain setting

//global vareables from example*************************************************

unsigned char Regs[11];// holds a copy of the ADS1256 registers

unsigned char Buffer[70];// scratch buffer

int g_RateCode = ADS1256_RATE_30000; // holds the sample rate code for the ADS1256

int g_nSamples = 100;// holds the number of samples to acquire

int g_nChannels = 1;// holds the number of channels in the list

byte clr;//used to clear registers to bit trash bin.

//************************ end of example vareables

//*************************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;

clr=SPSR;

//SPE=1 serial port enabled

//MSTR=1 master is AVR

//CPOL=0

//CPHA=0 Sample (Rising) Setup (Falling)

//SPI2X=1, SPR1=0 ,SPR0=1 FOSC/8 //this might have to be slower 7.68mhz/4 =1.92mhz

//spi2x is a little confusing it is different weather in master or slave mode? the MCU is master.

//SPSR uses SPI2X

SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR1)|(1<<SPR0);

SPSR= (1<<SPI2X);

//wait for things to settle

delay(10);

} //end of initilise spi

//*************************** spi sens from master to ad converter transfer function

//simple spi transfer function char in char out

//spdr = byte data register

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

}

//******************************** end spi transfer function

//************************** initilise Analog to digital converter

void ADS1256Init(void){

ads1256Reset();

//set /Chip Select high

digitalWrite(NEG_CHIP_SELECT,HIGH); //disable device

}

//************************** end of init analog to digital converter

void ads1256Reset(void){

digitalWrite(NEG_RESET,HIGH); //disable device

digitalWrite(NEG_RESET,LOW); //enable device

}

void setup() {

// initialize the communication port

Serial.begin(9600);

//set pins to nessisary data direction

pinMode(NEG_CHIP_SELECT,OUTPUT);//10 //Chip Select active low on pin 10

pinMode(NEG_RESET,OUTPUT); //RESET PIN active low on pin 11

pinMode(DATAOUT,OUTPUT);//14 MOSI

pinMode(DATAIN,INPUT);//DATAIN 12//MISO

pinMode(SPICLOCK,OUTPUT);// 13 sck

pinMode(SLAVESELECT,OUTPUT);//10//ss //this is redundant I am merging tutorials and need to decide on one…

// prints state with ending line break

Serial.println(“ADS1256 Init soon”);

// wait for the long string to be sent

delay(1000); //1 sec delay(1);=delay 1 ms

// initialize Hardware for ADS1256

ADS1256Init();

// prints state with ending line break

Serial.println(“ADS1256 Init…ed”);

// wait for the long string to be sent

delay(1000); //1 sec delay(1);=delay 1 ms

}

void loop() {

// prints state with ending line break

Serial.println(“ADS1256 infinite loop wait 1 sec”);

// wait for the long string to be sent

delay(1000); //1 sec delay(1);=delay 1 ms

// prints state with ending line break

Serial.println(“waited 1 sec”);

// wait for the long string to be sent

delay(100); //100 msec delay(1);=delay 1 ms

}

the header files…

#ifndef __ADS1256_H

#define __ADS1256_H

// define the port pins used for the ADS1256

#define N_DRDY 0x04

#define N_DRDY_IN P2IN

#define N_DRDY_DIR P2DIR

#define N_CS 0x20

#define N_CS_OUT P3OUT

#define N_CS_DIR P3DIR

// define the command bytes (see table 24 on page 32 in the PDS

#define CMD_WAKEUP 0x00

#define CMD_RDATA 0x01

#define CMD_RDATAC 0x03

#define CMD_SDATAC 0x0f

#define CMD_RREG 0x10

#define CMD_WREG 0x50

#define CMD_SELFCAL 0xf0

#define CMD_SELFOCAL 0xf1

#define CMD_SELFGCAL 0xf2

#define CMD_SYSOCAL 0xf3

#define CMD_SYSGCAL 0xf4

#define CMD_SYNC 0xfc

#define CMD_STANDBY 0xfd

#define CMD_RESET 0xfe

#define CMD_WAKEUP2 0xff

// define the ADS1256 registers

#define ADS1256_STATUS_REG 0x00

#define ADS1256_MUX_REG 0x01

#define ADS1256_ADCON_REG 0x02

#define ADS1256_DRATE_REG 0x03

#define ADS1256_IO_REG 0x04

#define ADS1256_OFC0_REG 0x05

#define ADS1256_OFC1_REG 0x06

#define ADS1256_OFC2_REG 0x07

#define ADS1256_FSC0_REG 0x08

#define ADS1256_FSC1_REG 0x09

#define ADS1256_FSC2_REG 0x0A

// define multiplexer codes

#define ADS1256_MUXP_AIN0 (0x0 << 4)

#define ADS1256_MUXP_AIN1 (0x1 << 4)

#define ADS1256_MUXP_AIN2 (0x2 << 4)

#define ADS1256_MUXP_AIN3 (0x3 << 4)

#define ADS1256_MUXP_AIN4 (0x4 << 4)

#define ADS1256_MUXP_AIN5 (0x5 << 4)

#define ADS1256_MUXP_AIN6 (0x6 << 4)

#define ADS1256_MUXP_AIN7 (0x7 << 4)

#define ADS1256_MUXP_AINCOM (0x8 << 4)

#define ADS1256_MUXN_AIN0 (0x0)

#define ADS1256_MUXN_AIN1 (0x1)

#define ADS1256_MUXN_AIN2 (0x2)

#define ADS1256_MUXN_AIN3 (0x3)

#define ADS1256_MUXN_AIN4 (0x4)

#define ADS1256_MUXN_AIN5 (0x5)

#define ADS1256_MUXN_AIN6 (0x6)

#define ADS1256_MUXN_AIN7 (0x7)

#define ADS1256_MUXN_AINCOM (0x8)

// define sample rates

#define ADS1256_RATE_30000 0xf0

#define ADS1256_RATE_15000 0xe0

#define ADS1256_RATE_7500 0xd0

#define ADS1256_RATE_3750 0xc0

#define ADS1256_RATE_2000 0xb0

#define ADS1256_RATE_1000 0xa1

#define ADS1256_RATE_500 0x92

#define ADS1256_RATE_100 0x82

#define ADS1256_RATE_60 0x72

#define ADS1256_RATE_50 0x63

#define ADS1256_RATE_30 0x53

#define ADS1256_RATE_25 0x43

#define ADS1256_RATE_15 0x33

#define ADS1256_RATE_10 0x23

#define ADS1256_RATE_5 0x13

#define ADS1256_RATE_2_5 0x03

// define gain codes

#define ADS1256_GAIN_1 0x00

#define ADS1256_GAIN_2 0x01

#define ADS1256_GAIN_4 0x02

#define ADS1256_GAIN_8 0x03

#define ADS1256_GAIN_16 0x04

#define ADS1256_GAIN_32 0x05

#define ADS1256_GAIN_64 0x06

typedef struct tagADS1256RegStruct

{

unsigned char Status;

unsigned char Mux;

unsigned char Adcon;

unsigned char Drate;

unsigned char Io;

unsigned char Ofc0;

unsigned char Ofc1;

unsigned char Ofc2;

unsigned char Fsc0;

unsigned char Fsc1;

unsigned char Fsc2;

} ADS1256_REG_STRUCT;

void inline ADS1256EnableCS(void);

void inline ADS1256DisableCS(void);

void ADS1256Init(void);

void ADS1256WaitForDataReady(void);

void ADS1256Reset(void);

void ADS1256Sync(void);

void ADS1256Wakeup(void);

void ADS1256SetRate(unsigned char Rate);

void ADS1256SetMux(unsigned char MuxCode);

void ADS1256SetGain(unsigned char GainCode);

long ADS1256ReadData(int fWaitFordataReady);

void ADS1256ReadRegister(int StartAddress, int NumRegs, unsigned char * pData);

void ADS1256WriteRegister(int StartAddress, int NumRegs, unsigned char * pData);

void ADS1256Calibrate(unsigned char CalCommand);

#endif

sorry the reset function should start high go low momentarily then go high again.