Jimmy Hack / MCP4822

Basic libraries for functionality of the MCP4822 DAC, an easy to use DAC outputting up to 4.096V.

Dependencies:   DAC

DAC_SPI/DAC_SPI.cpp

Committer:
JimmyTheHack
Date:
2012-06-14
Revision:
0:a10e8793cf0a

File content as of revision 0:a10e8793cf0a:

#include "DAC_SPI.h"

/*SPI Channels */
SPI SPI_A(p5, NC, p7);  //since we only have two SPI channels, which must be shared, define them here.
SPI SPI_B(p11, NC, p13);

/*Initialize DAC */
DAC_SPI::DAC_SPI(int SPIchannelNum, PinName _CS, PinName _LDAC) : CS(_CS), LDAC(_LDAC){  
    if (SPIchannelNum ==1){
        DACspi = &SPI_B;
    }  
    else{
        DACspi = &SPI_A;
    }
    messageBits(16);
}

/** Manually change the SPI frequency 
* Must be a value supported by the mbed and DAC
*/
void DAC_SPI::frequency(int freq){
    (*DACspi).frequency(freq);    
}


//specify the number of bits used in message packets to the DAC.
void DAC_SPI::messageBits(int bits){
    (*DACspi).format(bits,0);
}