should I use SPI.h or Icreate a new library file
ddsff:
should I use SPI.h or Icreate a new library file
you should be able to use the SPI.h library.
from the data sheet:
that's how I would wire it(untested):
and code it for example(also untested):
#include "SPI.h"
/* SPI pins
#define MOSI 11
#define MISO 12
#define SCK 13
*/
#define CS 10 //chip select pin
#define LD 9 //chip load pin
#define RS 8 //chip reset pin
#define MSB 8 //chip MSB pin
const uint8_t W_DACA = B10100000; //Software decode, Channel A
const uint8_t W_DACB = B11000000; //Software decode, Channel B
uint8_t DAC_write(uint8_t channel, uint16_t mV) {
byte xbyte;
if (mV < 4096) { //12 bit resolution i.e max value = 4095
if (channel == 1) {
xbyte = (mV >> 8) & 0x0F; //store DACvalue [11..8] to xbyte[3..0]
xbyte |= W_DACA; //Add DAC configuration (DAC_A selected)
}
else if (channel == 2) {
xbyte = (mV >> 8) & 0x0F; //store DACvalue [11..8] to xbyte[3..0]
xbyte |= W_DACB; //Add DAC configuration (DAC_B selected)
}
//Select DAC Chip
digitalWrite(CS, LOW);
//Send High Byte
SPI.transfer(xbyte);
//Send Low Byte
xbyte = mV;
SPI.transfer(xbyte);
//Deselect DAC Chip
digitalWrite(CS, HIGH);
//output voltage on selected channel
digitalWrite(LD, LOW);
digitalWrite(LD, HIGH);
return 1;
}
else
return 0;
}
void Reset_DAC(uint8_t msb) {
digitalWrite(MSB, msb); //0: Resets DAC Registers to Zero, 1: DAC Registers to Half Scale (800H)
digitalWrite(RS, LOW);
digitalWrite(RS, HIGH);
}
void setup() {
//Define SPI IOs (optional)
//pinMode(MOSI, OUTPUT);
//pinMode(MISO, INPUT);
//pinMode(SCK, OUTPUT);
//initialising the other pins
pinMode(CS, OUTPUT);
digitalWrite(CS, HIGH);
pinMode(LD, OUTPUT);
digitalWrite(LD, HIGH);
//if intending to used reset feature, RS and MSB also need to be initialised
pinMode(RS, OUTPUT);
digitalWrite(RS, HIGH);
pinMode(MSB, OUTPUT);
digitalWrite(MSB, HIGH);
//Initialise SPI interface
//SPI clock speed:10MHz, Data Shift:MSB First, Data Clock Idle: SPI_MODE0
SPI.beginTransaction(SPISettings(10000000, MSBFIRST, SPI_MODE0));
DAC_write(1, 1000); //sets channel A to 1V
DAC_write(2, 2500); //sets channel B to 2.5V
}
void loop() {
}
I am so sorry,but i am so careless that I should write DAC8552(a 16 bit da) but I write a DAC8522(a 12 bit da).It is wrong.
ddsff:
I am so sorry,but i am so careless that I should write DAC8552(a 16 bit da) but I write a DAC8522(a 12 bit da).It is wrong.
no matter... the datasheet seems to apply the same principle I used in the code I posted... hopefully you can figure it out! 
PS for that chip, no need to connect the MOSI pin since it does not exist on it!
sherzaad:
no matter... the datasheet seems to apply the same principle I used in the code I posted... hopefully you can figure it out!PS for that chip, no need to connect the MOSI pin since it does not exist on it!
thank you.iam trying to transfer this code