Arduino.ru

Почитать datasheet? Не?

Да вот даташит  http://www.ti.com/lit/ds/symlink/dac8554.pdf

Пробовал MCP4922, в протеусе все работает, но там два канала и на нее есть библиотека.

Как быть с 8554?

Так же. Подключаете по spi (только тут 3 проводный он, ибо в обратку ничего не ожидается) и шлете команды согласно ентой бамажки. Там все расписано.

Вот так будет работать? Puhlyaviy что скажете? В плане необходимо будет раздельное (независимое) управление каналами ЦАП. Проверить в реале пока нет возможности и в протеусе нет модели DAC8554...

DAC8554.H
/*************************************************************************
**  Device: DAC8554                                                 	**
**  File:   DAC8554.h - Library for get out analog voltage          	**
*************************************************************************/


#ifndef DAC8554_h
#define DAC8554_h

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

class DAC8554
{
  public:
    DAC8554(int SDI, int SCK,int CS, boolean DAC, boolean DAC1);    
    void setValue(int Value);

  private:
    int _DATAOUT;
    int _SPICLOCK;
    int _SLAVESELECT;
    boolean _DAC;
    boolean _DAC1;
                                                    

    void sendSPIHeader();
    void sendIntValueSPI(int value);
    void sendSPIClock();
};

#endif

/******************************** 
*				*
* DAC=LOW  DAC1=LOW => DAC_A select	*
* DAC=LOW  DAC1=HIGH => DAC_B select    *
* DAC=HIGH  DAC1=LOW => DAC_C select    *
* DAC=HIGH DAC1=HIGH => DAC_D select	*
*				        *
********************************/

DAC8554.CCP

/*************************************************************************
**  Device: DAC8554                                                 	**
**  File:   DAC8554.h - Library for get out analog voltage          	**
**************************************************************************/

#if defined(ARDUINO) && ARDUINO >= 100
#include "Arduino.h"
#else
#include "WProgram.h"
#endif

#include "DAC8554.h"

DAC8554::DAC8554(int SDI, int SCK, int CS, boolean DAC, boolean DAC1)
{
 _DATAOUT = SDI;
 _SPICLOCK = SCK;
 _SLAVESELECT = CS;
 _DAC = DAC;
 _DAC1 = DAC1;
 
 pinMode(_DATAOUT,OUTPUT);
 pinMode(_SPICLOCK,OUTPUT);
 pinMode(_SLAVESELECT,OUTPUT);

}

//************************************************************************
void DAC8554::setValue(int Value) {
  sendIntValueSPI(Value);
}
//************************************************************************ 
void DAC8554::sendSPIClock() {
  digitalWrite(_SPICLOCK, HIGH);
  digitalWrite(_SPICLOCK, LOW);
  delay(1);
}

//************************************************************************ 
void DAC8554::sendSPIHeader() {
					// bit 23 Adress select A1 pin 14 DAC8554
					// 0 
					// 1 
 digitalWrite(_DATAOUT,LOW);
 sendSPIClock();
					// bit 22 Adress select A0 pin 13 DAC8554
					// 0 
					// 1 
  digitalWrite(_DATAOUT,LOW);
  sendSPIClock();
                    // bit 21 LD 1
					// 0 
					// 1 
 digitalWrite(_DATAOUT,LOW);
 sendSPIClock();
					// bit 20 21 LD 0
					// 0 
					// 1 
 digitalWrite(_DATAOUT,LOW);
 sendSPIClock();
					// bit 19 
					// 0 
					// 1 
  digitalWrite(_DATAOUT,LOW);
  sendSPIClock();

  					// bit 18
					// 0/0 write to DAC_A 
					// 0/1 write to DAC_B
					// 1/0 write to DAC_C 
					// 1/1 write to DAC_D
  digitalWrite(_DATAOUT,_DAC1);
  sendSPIClock();
					// bit 17
					// 0/0 write to DAC_A 
					// 0/1 write to DAC_B
					// 1/0 write to DAC_C 
					// 1/1 write to DAC_D
			digitalWrite(_DATAOUT,_DAC);
  sendSPIClock();
  }
 
//************************************************************************
void DAC8554::sendIntValueSPI(int value) {
 // initiate data transfer with 8554
 digitalWrite(_SLAVESELECT,LOW);
 
 // send 4 bit header
 sendSPIHeader();
 
  // send data
  for(int i=16;i>=0;i--){
    digitalWrite(_DATAOUT,((value&(1<<i)))>>i);
    sendSPIClock();
  }
 
  // finish data transfer
  digitalWrite(_SLAVESELECT,HIGH);
} 
 

Скетч для ардуины (не для схемы) 

/*************************************************************************
**  DAC8554.h - Library for get out analog voltage          	        **
*************************************************************************/

#include "DAC8554.h"

#define AI1 A1                                  //Analog input monitor 1
#define AI2 A2                                  //Analog input monitor 2
#define AI3 A3                                  //Analog input monitor 3
#define AI4 A4                                  //Analog input monitor 4

//define AnalogOutput (MOSI_pin, SCK_pin, CS_pin, DAC_x, DAC1_x); //, GAIN) 
DAC8554 AnalogOutput1(11,13,12,LOW, LOW); //,HIGH);    //define AnalogOutput1 for MEGA_board, select DAC_A
DAC8554 AnalogOutput2(11,13,12,HIGH,LOW); //,LOW);    //define AnalogOutput2 for MEGA_board, select DAC_B
DAC8554 AnalogOutput3(11,13,12,LOW,HIGH); //,LOW);    //define AnalogOutput3 for MEGA_board, select DAC_С
DAC8554 AnalogOutput4(11,13,12,HIGH,HIGH); //,LOW);   //define AnalogOutput4 for MEGA_board, select DAC_В
/************************
*            |  UNO     *
*  -------------------- *
*  SCK_pin   |   13     *
*  MOSI_pin  |   11     *
*  CS_pin    |   12     *
*********************************
* DAC=LOW   DAC1=LOW =>  DAC_A select  *
* DAC=LOW   DAC1=HIGH => DAC_B select  *
* DAC=HIGH  DAC1=LOW =>  DAC_C select  *
* DAC=HIGH  DAC1=HIGH => DAC_D select  *

*				*
* GAIN=LOW  => 2x gain select	*
* GAIN=HIGH => 1x gain select	*
********************************/

//***************************************************************** 
void setup() { 
  AnalogOutput1.setValue(4000);
  AnalogOutput2.setValue(0);
  AnalogOutput3.setValue(0);
  AnalogOutput4.setValue(0);
  delay(1000);
  pinMode(AI1,INPUT);                            //Voltage measurement pin1
  pinMode(AI2,INPUT);                            //Voltage measurement pin2
  pinMode(AI3,INPUT);                            //Voltage measurement pin3
  pinMode(AI4,INPUT);                            //Voltage measurement pin4
   
  Serial.begin(9600);                            //Init serial interface 
  Serial.println("Ready");        
} 

//*****************************************************************
void loop() {
 for (int i=0; i<65536; i+=64)
 {
  Serial.print(i,DEC);
  AnalogOutput1.setValue(i);                     //set voltage for AnalogOutput1 
  AnalogOutput2.setValue(i);                     //set volateg for AnalogOutput2
  AnalogOutput3.setValue(i);                     //set voltage for AnalogOutput3
  AnalogOutput4.setValue(i);                     //set volateg for AnalogOutput4
  
  
  Serial.print(";");
  delay(10);

  int AO1 = analogRead(AI1);                     //check the input voltage AI1 (pin A1)
  int AO2 = analogRead(AI2);                     //check the input voltage AI2 (pin A2)
  int AO3 = analogRead(AI3);                     //check the input voltage AI1 (pin A3)
  int AO4 = analogRead(AI4);                     //check the input voltage AI2 (pin A4)
  
  delay(10);
  
  Serial.print("AO1="); 
  Serial.print(AO1);
  Serial.print(" ; AO2=");  
  Serial.println(AO2);
   Serial.print("AO3="); 
  Serial.print(AO3);
  Serial.print(" ; AO4=");  
  Serial.println(AO4);  
 }
}
 

не может читать схематику.