MCP4822 - Basic libraries for functionality of the MCP4822 …

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

DAC_SPI/DAC_SPI.cpp@0:a10e8793cf0a, 2012-06-14 (annotated)

User	Revision	Line number	New contents of line
JimmyTheHack	0:a10e8793cf0a	1	#include "DAC_SPI.h"
JimmyTheHack	0:a10e8793cf0a	2
JimmyTheHack	0:a10e8793cf0a	3	/SPI Channels /
JimmyTheHack	0:a10e8793cf0a	4	SPI SPI_A(p5, NC, p7); //since we only have two SPI channels, which must be shared, define them here.
JimmyTheHack	0:a10e8793cf0a	5	SPI SPI_B(p11, NC, p13);
JimmyTheHack	0:a10e8793cf0a	6
JimmyTheHack	0:a10e8793cf0a	7	/Initialize DAC /
JimmyTheHack	0:a10e8793cf0a	8	DAC_SPI::DAC_SPI(int SPIchannelNum, PinName _CS, PinName _LDAC) : CS(_CS), LDAC(_LDAC){
JimmyTheHack	0:a10e8793cf0a	9	if (SPIchannelNum ==1){
JimmyTheHack	0:a10e8793cf0a	10	DACspi = &SPI_B;
JimmyTheHack	0:a10e8793cf0a	11	}
JimmyTheHack	0:a10e8793cf0a	12	else{
JimmyTheHack	0:a10e8793cf0a	13	DACspi = &SPI_A;
JimmyTheHack	0:a10e8793cf0a	14	}
JimmyTheHack	0:a10e8793cf0a	15	messageBits(16);
JimmyTheHack	0:a10e8793cf0a	16	}
JimmyTheHack	0:a10e8793cf0a	17
JimmyTheHack	0:a10e8793cf0a	18	/** Manually change the SPI frequency
JimmyTheHack	0:a10e8793cf0a	19	* Must be a value supported by the mbed and DAC
JimmyTheHack	0:a10e8793cf0a	20	*/
JimmyTheHack	0:a10e8793cf0a	21	void DAC_SPI::frequency(int freq){
JimmyTheHack	0:a10e8793cf0a	22	(*DACspi).frequency(freq);
JimmyTheHack	0:a10e8793cf0a	23	}
JimmyTheHack	0:a10e8793cf0a	24
JimmyTheHack	0:a10e8793cf0a	25
JimmyTheHack	0:a10e8793cf0a	26	//specify the number of bits used in message packets to the DAC.
JimmyTheHack	0:a10e8793cf0a	27	void DAC_SPI::messageBits(int bits){
JimmyTheHack	0:a10e8793cf0a	28	(*DACspi).format(bits,0);
JimmyTheHack	0:a10e8793cf0a	29	}