Rev 2116 Rev 2222
1 #include <avr/io.h> 1 #include <avr/io.h>
2 #include "mcp4922.h" 2 #include "mcp4922.h"
3 #include "spi.h" 3 #include "spi.h"
4   4  
5   5  
6 void DAC_write(unsigned char data) { 6 void DAC_write(unsigned char data) {
7 unsigned char first, second; 7 unsigned char first, second;
8 first=(0b10110000 | data>>4); // DACB, unbuffered, 1x, ON, 12 data bites 8 first=(0b10110000 | data>>4); // DACB, unbuffered, 1x, ON, 12 data bites
9 second=(data<<4); 9 second=(data<<4);
10 10
11 DAC_CS_PORT &= ~(1 << DAC_CS_PIN); 11 DAC_CS_PORT &= ~(1 << DAC_CS_PIN);
12 SPI_MasterTransmit(first); 12 SPI_MasterTransmit(first);
13 SPI_MasterTransmit(second); 13 SPI_MasterTransmit(second);
14 DAC_CS_PORT |= 1 << DAC_CS_PIN; 14 DAC_CS_PORT |= 1 << DAC_CS_PIN;
15 } 15 }