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MCP4921 SPI DAC Driver

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sshahryiar

Joined: 05 May 2010
Posts: 94
Location: Dhaka, Bangladesh

MCP4921 SPI DAC Driver

Posted: Wed Dec 03, 2014 7:36 am

MCP4921.h

Code:

#define CLK PIN_A0
#define CS PIN_A3
#define SDI PIN_A6
#define LDAC PIN_A7

#define ignore_cmd 0x80
#define DAC_write_cmd 0x00
#define Buffer_on 0x40
#define Buffer_off 0x00
#define Gain_1X 0x20
#define Gain_2X 0x00
#define Run_cmd 0x10
#define Shutdown 0x00

void init_dac();
void DAC_write(unsigned char cmd, unsigned long data);

MCP4921.c

Code:

#include "mcp4921.h"

void init_dac()
{
output_high(CS);
output_high(LDAC);
output_high(CLK);
output_high(SDI);
}

void DAC_write(unsigned char cmd, unsigned long data)
{
unsigned char s = 16;

unsigned long value = 0;

value = cmd;
value <<= 8;
value |= (data & 0xFFF);

output_low(CS);

while(s > 0)
{
if((value & 0x8000) != 0)
{
output_high(SDI);
}
else
{
output_low(SDI);
}
output_low(CLK);
output_high(CLK);
value <<= 1;
s -= 1;
}

output_low(LDAC);
output_high(CS);
delay_us(10);
output_high(LDAC);
}

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SShahryiar

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