hello
i am trying to interface ads1256 with arduino uno . but i have a problem in that i try to write and read the register.i read 1st four register and print on serialport.
but result is always
FF
FF
FF
FF
my code is
#include <SPI.h>
#define DRDY_PIN 6
#define CS_PIN 7
#define SPI_MASTER_DUMMY 0xFF
#define MISO_PIN 12
#define MOSI_PIN 11
#define SCK_PIN 13
#define RESET_PIN 22
#define WREG 0x50
//#define RREG 0x23
#define RREG 0x10
#define PGA 1 // Programmable Gain = 1
#define VREF 5 // Internal reference of 2.048V
#define VFSR VREF/PGA
#define FSR (((long int)1<<23)-1)
//const int dataReadyPin = 6;
//const int chipSelectPin = 10;
volatile byte MSB;
volatile byte data;
volatile byte LSB;
uint8_t Config_Reg0;
uint8_t Config_Reg1;
uint8_t Config_Reg2;
uint8_t Config_Reg3;
//volatile char SPI_RX_Buff[3];
volatile byte *SPI_RX_Buff_Ptr;
void setup()
{
void writeRegister(uint8_t address, uint8_t value);
uint8_t readRegister(uint8_t address);
Serial.begin(9600);
SPI.begin();
pinMode(DRDY_PIN, INPUT);
pinMode(CS_PIN, OUTPUT);
digitalWrite(CS_PIN, LOW);
pinMode(SCK_PIN, OUTPUT);
digitalWrite(SCK_PIN, LOW);
writeRegister(0x00, 0x01);/// (REGISTER ADRESS:VALUE)
writeRegister(0x01, 0x0F);
writeRegister(0x02, 0x20);
writeRegister(0x03, 0xF0);
writeRegister(0x04, 0xE0);
writeRegister(0x05, 0x00);
writeRegister(0x06, 0x00);
writeRegister(0x07, 0x00);
writeRegister(0x08, 0x08);
writeRegister(0x09, 0xAC);
writeRegister(0x0A, 0x44);
Config_Reg0 = readRegister(0x00);
Config_Reg1 = readRegister(0x01);
Config_Reg2 = readRegister(0x02);
Config_Reg3 = readRegister(0x03);
Serial.println("Config_Reg : ");
Serial.println(Config_Reg0,HEX);
Serial.println(Config_Reg1,HEX);
Serial.println(Config_Reg2,HEX);
Serial.println(Config_Reg3,HEX);
Serial.println(" ");
digitalWrite(CS_PIN,HIGH); //release chip, signal end transfer
delay(100);
}
void loop()
{
long int bit32;
long int bit24;
byte *config_reg;
static byte SPI_Buff[3];
if((digitalRead(DRDY_PIN)) == LOW) // Wait for DRDY to transition low
{
digitalWrite(CS_PIN,LOW); //Take CS low
delayMicroseconds(100);
for (int i = 0; i < 3; i++)
{
SPI_Buff[i] = SPI.transfer(SPI_MASTER_DUMMY);
}
delayMicroseconds(100);
digitalWrite(CS_PIN,HIGH);
// Clear CS to high
MSB = SPI_Buff[0];
data = SPI_Buff[1];
LSB = SPI_Buff[2];
bit24 = MSB;
bit24 = (bit24 << 8) | data;
bit24 = (bit24 << 8) | LSB; // Converting 3 bytes to a 24 bit int
bit24= ( bit24 << 8 );
bit32 = ( bit24 >> 8 ); // Converting 24 bit two's complement to 32 bit two's complement
float Vout = (float)((bit32*VFSR*1000)/16777215); //In mV
delay(300);
//Serial.print("Vout in mV : ");
Serial.println(Vout);
//Serial.print("Vout in V : ");
// Serial.print(Vout/1000);
//Serial.print(" 32bit HEX : ");
//Serial.println(bit32,BIN);
}
}
void writeRegister(uint8_t address, uint8_t value)
{
digitalWrite(CS_PIN,LOW);
delay(5);
SPI.transfer(WREG|(address<<2));
SPI.transfer(value);
delay(5);
digitalWrite(CS_PIN,HIGH);
}
uint8_t readRegister(uint8_t address)
{
uint8_t data;
digitalWrite(CS_PIN,LOW);
delay(5);
SPI.transfer(RREG|(address<<2));
data = SPI.transfer(SPI_MASTER_DUMMY);
delay(5);
digitalWrite(CS_PIN,HIGH);
return data;
}
i see the output on saleae logic analyzer
please sir i am confused where i do mistake....
thank in advance
and sorry for my bad english
