HI i am trying to interface ADS8665 with arduino uno board but i am getting adc value constant which is mention in below picture
and i follow this link
https://electronics.stackexchange.com/questions/503063/interfacing-ad7321-adc-with-arduino-using-spi
output
my code :
#include <SPI.h>
#define CS_PIN 7 //Pin 10 defined as the CS Pin. //AD7321 12 bit
void setup()
{
Serial.begin(115200); //Initalise port to print in serial terminal
pinMode(CS_PIN,OUTPUT); //Pin 10 as CS
digitalWrite(CS_PIN,HIGH);
SPI.begin(); //Intialise SPI PORT
SPI.setBitOrder(MSBFIRST);
SPI.setClockDivider(SPI_CLOCK_DIV128);
initialise();
}
void loop()
{
uint16_t adcOut=0;
float value=0.0;
initialise();
adcOut = readADC(0);
adcOut = (adcOut<<3); // Bitshift to take last 13bits
value = (adcOut>>3);
Serial.println(value);
//delay(0.5); //wait a second
delayMicroseconds(0.5); //Delay
}
uint16_t readADC(int channel)
{
uint16_t output=0;
digitalWrite(CS_PIN,LOW);
byte msb=0;
byte lsb=0;
msb = SPI.transfer(0x00);
lsb = SPI.transfer(0x00);
digitalWrite(CS_PIN,HIGH); // Deselect slave by pulling CS_PIN HIGH.
output = (msb << 4 | lsb); //Combine MSB with LSB to form the 16 Bit Analog read Value.
// Serial.println(output);
return output; //Output Value
}
void initialise()
{
digitalWrite(CS_PIN, LOW); //Select the connected chip by pulling CS_PIN LOW.
SPI.transfer(0b00000000); //Defines range register -> | Write (1) | 0 | Register Select (1) | Vin0A | Vin0B | 0 | 0 | Vin1A |
SPI.transfer(0b00000000); // | Vin1B | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
digitalWrite(CS_PIN, HIGH);
delayMicroseconds(1);
digitalWrite(CS_PIN, LOW);
SPI.transfer(0b00000000); //Defines control register -> | Write (1) | 0 | Register Select (0) | 0 | 0 | ADD0 | Mode1 | Mode0 |
SPI.transfer(0b00001011); // | PM1 | PM0 | Coding | Ref | Seq1 | Seq2 | 0 | 0 |
digitalWrite(CS_PIN, HIGH);
delayMicroseconds(1);
}
block diagram connection
can you guide me how to interface with mcu .
BR
DG
