Henry Herman / MCP3208

8 channel ADC library

MCP482X.cpp@0:b58572ce83b6, 2013-08-14 (annotated)

Committer:
henryeherman
Date:
Wed Aug 14 00:21:42 2013 +0000
Revision:
0:b58572ce83b6
Initial commit of a library to communicate with the MCP482X SPI based DAC from microchip.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
henryeherman 0:b58572ce83b6 1 #include "mbed.h"
henryeherman 0:b58572ce83b6 2 #include "MCP482X.h"
henryeherman 0:b58572ce83b6 3
henryeherman 0:b58572ce83b6 4 using namespace mbed;
henryeherman 0:b58572ce83b6 5
henryeherman 0:b58572ce83b6 6 MCP482X::MCP482X(SPI &spi, DigitalOut &cspin): _spi(spi), _cspin(cspin) {
henryeherman 0:b58572ce83b6 7 gainA = 1;
henryeherman 0:b58572ce83b6 8 gainB = 1;
henryeherman 0:b58572ce83b6 9 valA = 0;
henryeherman 0:b58572ce83b6 10 valB = 0;
henryeherman 0:b58572ce83b6 11 enable();
henryeherman 0:b58572ce83b6 12 _cspin.write(1);
henryeherman 0:b58572ce83b6 13 }
henryeherman 0:b58572ce83b6 14
henryeherman 0:b58572ce83b6 15 MCP482X::~MCP482X() {
henryeherman 0:b58572ce83b6 16 }
henryeherman 0:b58572ce83b6 17
henryeherman 0:b58572ce83b6 18 int MCP482X::writeA(int value){
henryeherman 0:b58572ce83b6 19 int tempval = 0;
henryeherman 0:b58572ce83b6 20 valA = (value & 0x0FFF);
henryeherman 0:b58572ce83b6 21 tempval = SELECTDACA(valA);
henryeherman 0:b58572ce83b6 22
henryeherman 0:b58572ce83b6 23 if(gainA == 1) {
henryeherman 0:b58572ce83b6 24 tempval = SELECT1XGAIN(tempval);
henryeherman 0:b58572ce83b6 25 } else {
henryeherman 0:b58572ce83b6 26 tempval = SELECT2XGAIN(tempval);
henryeherman 0:b58572ce83b6 27 }
henryeherman 0:b58572ce83b6 28
henryeherman 0:b58572ce83b6 29 if(bshutdown==true) {
henryeherman 0:b58572ce83b6 30 tempval = SELECTPWROFF(tempval);
henryeherman 0:b58572ce83b6 31 } else {
henryeherman 0:b58572ce83b6 32 tempval = SELECTPWRON(tempval);
henryeherman 0:b58572ce83b6 33 }
henryeherman 0:b58572ce83b6 34
henryeherman 0:b58572ce83b6 35 sendValue(tempval);
henryeherman 0:b58572ce83b6 36 return tempval;
henryeherman 0:b58572ce83b6 37 }
henryeherman 0:b58572ce83b6 38
henryeherman 0:b58572ce83b6 39 int MCP482X::writeB(int value){
henryeherman 0:b58572ce83b6 40
henryeherman 0:b58572ce83b6 41 int tempval = 0;
henryeherman 0:b58572ce83b6 42 valB = (value & 0x0FFF);
henryeherman 0:b58572ce83b6 43 tempval = SELECTDACB(valB);
henryeherman 0:b58572ce83b6 44
henryeherman 0:b58572ce83b6 45 if(gainB == 1) {
henryeherman 0:b58572ce83b6 46 tempval = SELECT1XGAIN(tempval);
henryeherman 0:b58572ce83b6 47 } else {
henryeherman 0:b58572ce83b6 48 tempval = SELECT2XGAIN(tempval);
henryeherman 0:b58572ce83b6 49 }
henryeherman 0:b58572ce83b6 50
henryeherman 0:b58572ce83b6 51 if(bshutdown==true) {
henryeherman 0:b58572ce83b6 52 tempval = SELECTPWROFF(tempval);
henryeherman 0:b58572ce83b6 53 } else {
henryeherman 0:b58572ce83b6 54 tempval = SELECTPWRON(tempval);
henryeherman 0:b58572ce83b6 55 }
henryeherman 0:b58572ce83b6 56
henryeherman 0:b58572ce83b6 57 sendValue(tempval);
henryeherman 0:b58572ce83b6 58 return tempval;
henryeherman 0:b58572ce83b6 59 }
henryeherman 0:b58572ce83b6 60
henryeherman 0:b58572ce83b6 61 void MCP482X::setGainA(int value){
henryeherman 0:b58572ce83b6 62 if(value==1 || value == 2)
henryeherman 0:b58572ce83b6 63 gainA = value;
henryeherman 0:b58572ce83b6 64 else
henryeherman 0:b58572ce83b6 65 gainA = 1;
henryeherman 0:b58572ce83b6 66 }
henryeherman 0:b58572ce83b6 67
henryeherman 0:b58572ce83b6 68 void MCP482X::setGainB(int value){
henryeherman 0:b58572ce83b6 69 if(value==1 || value == 2)
henryeherman 0:b58572ce83b6 70 gainB = value;
henryeherman 0:b58572ce83b6 71 else
henryeherman 0:b58572ce83b6 72 gainB = 1;
henryeherman 0:b58572ce83b6 73 }
henryeherman 0:b58572ce83b6 74
henryeherman 0:b58572ce83b6 75 void MCP482X::disable() {
henryeherman 0:b58572ce83b6 76 bshutdown = true;
henryeherman 0:b58572ce83b6 77 writeA(valA);
henryeherman 0:b58572ce83b6 78 writeB(valB);
henryeherman 0:b58572ce83b6 79 }
henryeherman 0:b58572ce83b6 80
henryeherman 0:b58572ce83b6 81 void MCP482X::enable() {
henryeherman 0:b58572ce83b6 82 bshutdown = false;
henryeherman 0:b58572ce83b6 83 writeA(valA);
henryeherman 0:b58572ce83b6 84 writeB(valB);
henryeherman 0:b58572ce83b6 85 }
henryeherman 0:b58572ce83b6 86
henryeherman 0:b58572ce83b6 87 void MCP482X::configspi() {
henryeherman 0:b58572ce83b6 88 _spi.format(16, 0);
henryeherman 0:b58572ce83b6 89 _spi.frequency(50000);
henryeherman 0:b58572ce83b6 90 }
henryeherman 0:b58572ce83b6 91
henryeherman 0:b58572ce83b6 92 void MCP482X::sendValue(int value) {
henryeherman 0:b58572ce83b6 93 configspi();
henryeherman 0:b58572ce83b6 94 _cspin.write(0);
henryeherman 0:b58572ce83b6 95 _spi.write(value);
henryeherman 0:b58572ce83b6 96 _cspin.write(1);
henryeherman 0:b58572ce83b6 97 }