main.cpp

00001 
00002 #include "mbed.h"
00003 #include "MCP4922.h"
00004 
00005 MCP4922 MCP(SPI_MOSI, SPI_SCK,PB_6);  // MOSI, SCLK, CS
00006 
00007 
00008 /**** Main Function  ***/
00009 int main(void)
00010 {
00011     MCP.frequency(3125000);
00012 
00013     uint16_t i=0;
00014     int state=0;
00015     while(1) {
00016         if(i < 0x07FF) {
00017             i++;
00018         } 
00019         else {
00020             i=0;
00021             if (state == 0 ){
00022                 state = 1;    
00023             }
00024             else if(state == 1) {
00025                 state = 2;
00026             }
00027             else if(state == 2){
00028                 state = 3;
00029             }
00030             else if(state == 3){
00031                 state = 0;
00032             }
00033         }
00034 
00035         if(state ==0) {
00036             MCP.writeA(i);
00037         }
00038         else if (state == 1){
00039             MCP.writeA( ((~i))&0x07FF);
00040         }
00041         else if (state == 2){
00042             MCP.writeA( ((~i))&0x0FFF);
00043         }
00044         else if (state == 3){
00045             MCP.writeA(i+0x07FF);
00046         }
00047         wait_us(2);
00048     }
00049 }