Arduino Uno SPI with MAX5144 DAC

Projects Networking, Protocols, and Devices
1

Hi guys,

I'm new to programming and also arduino. Currently I want to control a DAC using arduino uno's SPI. I think I have trouble writing the code, and I did some research but didn't find any simple code for SPI. Could anyone help me check my code? Thanks in advance!

I've included my code and datasheet for the dac.

MAX5141-MAX5144.pdf (411 KB)

SPI_MAXEVkit.ino (583 Bytes)

2 
#include <SPI.h>

int CS = 10;    //pin10 chip select
int Data = 11;  //pin11 MOSI serial data
int SCLK = 13;   //pin13 clock

SPISettings mysetting(25000000, MSBFIRST, SPI_MODE0);

void setup() {
  // put your setup code here, to run once:
pinMode(CS,OUTPUT);
pinMode(Data,OUTPUT);
pinMode(SCLK,OUTPUT);

SPI.begin();

}

byte First_byte = 0b11111111;
byte Second_byte = 0b11111100;

void loop() {
  // put your main code here, to run repeatedly:
SPI.beginTransaction(mysetting);
digitalWrite(CS,LOW);
SPI.transfer(First_byte);
SPI.transfer(Second_byte);
digitalWrite(CS,HIGH);

}
3 
// format needed is
// (MSB-x-x-x-x-x-x-x)-(x-x-x-x-x-LSB-0-0) 
// so shift your 14 bit data 2 bits left before sending it out:
yourDataInt = yourDataInt <<2;
digitalWrite (csPin, LOW); // cs connected to D10
SPI.transfer (highByte (yourDataInt));  
SPI.transfer (lowByte (yourDataInt)); 
digitalWrite (csPin, HIGH);
4

Thanks for helping!

Should I write this part in void loop?