Sakai Ritaro / MCP4922

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Show/hide line numbers MCP4922.cpp Source File

MCP4922.cpp

00001 #include "MCP4922.h"
00002 #include "mbed.h"
00003 
00004 MCP4922::MCP4922(PinName MOSI,PinName SCK,PinName CS,PinName LDAC):
00005     dac_SPI(MOSI,NC,SCK),dac_cs(CS),dac_l(LDAC)
00006 {
00007     dac_SPI.format(16,0);
00008     dac_SPI.frequency(20000000);
00009     dac_cs=1;
00010     dac_l=1;
00011 }
00012 
00013 void MCP4922::write(int ch,float value)
00014 {
00015     if(value<0) {
00016         value=0;
00017     } else if(value>1) {
00018         value=1;
00019     }
00020     dac_cs=0;
00021     int data;
00022     if(ch==0) {
00023         data=(0b0011<<12)|(int)(value*0xFFF);
00024     } else if(ch==1) {
00025         data=(0b1011<<12)|(int)(value*0xFFF);
00026     }
00027     dac_SPI.write(data);
00028     dac_cs=1;
00029     dac_l=0;
00030     dac_l=1;
00031 }
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