main.cpp

00001 // example code to get MAX5842 working
00002 // Copyright (c) 2009, sford
00003 // Released under the MIT License: http://mbed.org/license/mit
00004 
00005 // MAX5842 setup: ADD = 0v, REF = 3.3v, OUTA -> p16
00006 
00007 #include "mbed.h"
00008 
00009 AnalogIn result(p16); // input to test MAX5842 output 
00010 DigitalOut led(LED1);
00011 
00012 I2C max5842(p9, p10);
00013 
00014 int main() {
00015 
00016     max5842.frequency(400000); // 400 KHz
00017     
00018     // ADDR: 011 110 ADD, where ADD = 0 
00019     // 011 1100 == 0x3C
00020     const int addr = 0x3C;
00021 
00022     // Power up the DAC
00023     // - Extended Commands [ 1111 0000 xx DCBA PD1 PD0 ]
00024     // - DCBA = 1111 means select all, PD = 00 means power on
00025     char power_up[2] = {0xF0, 0x3C};
00026     max5842.write(addr, power_up, 2);
00027     
00028     // set A output to 50%
00029     //   0 (set A) D DD
00030     char data[2] = {0x08, 0x00};
00031     max5842.write(addr, data, 2);
00032 
00033     while(1) {
00034         printf("res = %f\n", result.read());
00035         led = !led;
00036         wait(0.25);
00037     }
00038 }