SPI with ADC7066 (TI Chip)

Projects Programming
1 
#include <SPI.h>

 const int CS = 53;
 
  void setup(){ 
  
  pinMode (CS, OUTPUT);
  digitalWrite(CS, HIGH);
  SPI.begin();
  SPI.setBitOrder(MSBFIRST);        
  SPI.setDataMode(SPI_MODE0);
  SPI.setClockDivider(SPI_CLOCK_DIV32);
  Serial.begin(9600);
  delay (100);
  }

void loop() {
writeReg1(0x11,0x06);
  
  delay(5000);
  void writeReg1 (byte Add, byte mask){
    
  byte RD_REG= 0x10;
  byte WR_REG= 0x08;
  byte dummy= 0x00;
 
  digitalWrite(CS, LOW);
  SPI.transfer(RD_REG);
  SPI.transfer(Add);
  SPI.transfer(dummy);
  digitalWrite(CS, HIGH);
  
  digitalWrite(CS, LOW);
  SPI.transfer(dummy);
  SPI.transfer(dummy);
  SPI.transfer(dummy);
  digitalWrite(CS, HIGH);
}

I am trying to read data on CH1 of ADS7066, but getting 0 on Oscilloscope. Any help would be appreciated.

DataSheet: ADS7066 data sheet, product information and support | TI.com

2

I'm assuming from the const int CS = 53; that this is being done on a Mega. But it really doesn't matter, as the provided sketch doesn't compile.

arduino-cli compile -b arduino:avr:mega:cpu=atmega2560 --warnings all --output-dir /home/me/tmp --no-color (in directory: /home/me/Documents/sketchbook/Mega/test)
/home/me/Documents/sketchbook/Mega/test/test.ino: In function 'void loop()':
/home/me/Documents/sketchbook/Mega/test/test.ino:18:1: error: 'writeReg1' was not declared in this scope
 writeReg1(0x11,0x06);
 ^~~~~~~~~
/home/me/Documents/sketchbook/Mega/test/test.ino:21:39: error: a function-definition is not allowed here before '{' token
   void writeReg1 (byte Add, byte mask){
                                       ^
/home/me/Documents/sketchbook/Mega/test/test.ino:38:1: error: expected '}' at end of input
 }
 ^
Used library Version Path
SPI          1.0     /home/me/.arduino15/packages/arduino/hardware/avr/1.8.3/libraries/SPI
Used platform Version Path
arduino:avr   1.8.3   /home/me/.arduino15/packages/arduino/hardware/avr/1.8.3
Error during build: exit status 1
Compilation failed.
3

If an oscilloscope shows 0 (no signal/low signal), the signal source is not connected or not sending anything; what is the signal source?

That would not be a problem related to your program.

As indicated, your code does not compile. Because you did not close loop() with a }, void writeReg1 (byte Add, byte mask){ is inside loop() where it should not be. Add a } after the delay(5000).

I'm not familiar with the ADS7066 so can't advise further.

4

Hi,

Have you tried the code TI suggests? That code is located here.

5

Hi All,
Apologies for the vague question; I am trying to do SPI communication between ADC7066 and Arduino Mega. I have made few changes in the code.

I am supplying 1V to the code CH1of the ADS7066 from an External Power Supply.

Connection Diagram:
|ADC7066| Uno|

|CS| Digital Pin 53|
|SDI| MOSI (51 )|
|SDO| MISO (50)|
|CLK| CLK (52)|
|5V| 5V|
|AIN1| 2V|

Arduino Code :

#include <SPI.h>


 const int CS = 53;
 
  void setup(){ 
  
  pinMode (CS, OUTPUT);
  digitalWrite(CS, HIGH);
  SPI.begin();
  SPI.setBitOrder(MSBFIRST);        
  SPI.setDataMode(SPI_MODE0);
  SPI.setClockDivider(SPI_CLOCK_DIV16);
  Serial.begin(9600);
  delay (100);
  }
void loop() {
byte  voltage0 = readAdc(0);
  
  delay(5000);
  
  
}
 byte readAdc(int channel){

byte RD_REG = 0x10;
byte Add = 0x11;
byte Dummy = 0x00;
digitalWrite(CS, LOW);
SPI.transfer(RD_REG);
SPI.transfer(Add);
SPI.transfer(Dummy);
digitalWrite(CS, HIGH);

digitalWrite(CS, LOW);
byte value = SPI.transfer(Dummy);
SPI.transfer(Dummy);
SPI.transfer(Dummy);
digitalWrite(CS, HIGH);

Serial.println(value, BIN);
  }

Scope Image:

image
image1024×768 82.3 KB

6

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