Henry Herman / MCP3202

Dual ADC library

Dependents:   elixys

mcp3202.cpp@1:4e6619093761, 2013-12-15 (annotated)

Committer:
henryeherman
Date:
Sun Dec 15 02:42:30 2013 +0000
Revision:
1:4e6619093761
Working Dual ADC library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
henryeherman 1:4e6619093761 1 #include "mbed.h"
henryeherman 1:4e6619093761 2 #include "mcp3202.h"
henryeherman 1:4e6619093761 3
henryeherman 1:4e6619093761 4 using namespace mbed;
henryeherman 1:4e6619093761 5
henryeherman 1:4e6619093761 6 MCP3202::MCP3202(SPI &spi, void(*sel)(void), void(*usel)(void)): _spi(spi) {
henryeherman 1:4e6619093761 7 selectfxn = sel;
henryeherman 1:4e6619093761 8 unselectfxn = usel;
henryeherman 1:4e6619093761 9 enable();
henryeherman 1:4e6619093761 10 }
henryeherman 1:4e6619093761 11
henryeherman 1:4e6619093761 12 MCP3202::~MCP3202() {
henryeherman 1:4e6619093761 13 }
henryeherman 1:4e6619093761 14
henryeherman 1:4e6619093761 15 int MCP3202::readA(){
henryeherman 1:4e6619093761 16 //printf("Read A\r\n");
henryeherman 1:4e6619093761 17 select();
henryeherman 1:4e6619093761 18 _spi.write(STARTBIT);
henryeherman 1:4e6619093761 19 int upperbyte = _spi.write(SGL_DIFF|MSBF);
henryeherman 1:4e6619093761 20 int lowerbyte = _spi.write(0x00);
henryeherman 1:4e6619093761 21 deselect();
henryeherman 1:4e6619093761 22 int value = ((0x0F & upperbyte) << 8) | lowerbyte;
henryeherman 1:4e6619093761 23 return value;
henryeherman 1:4e6619093761 24 }
henryeherman 1:4e6619093761 25
henryeherman 1:4e6619093761 26 int MCP3202::readB(){
henryeherman 1:4e6619093761 27 //printf("Read B\r\n");
henryeherman 1:4e6619093761 28 select();
henryeherman 1:4e6619093761 29 _spi.write(STARTBIT);
henryeherman 1:4e6619093761 30 int upperbyte = _spi.write(SGL_DIFF|ODD_SIGN|MSBF);
henryeherman 1:4e6619093761 31 int lowerbyte = _spi.write(0x00);
henryeherman 1:4e6619093761 32 deselect();
henryeherman 1:4e6619093761 33 int value = ((0x0F & upperbyte) << 8) | lowerbyte;
henryeherman 1:4e6619093761 34 return value;
henryeherman 1:4e6619093761 35 }
henryeherman 1:4e6619093761 36
henryeherman 1:4e6619093761 37 void MCP3202::disable() {
henryeherman 1:4e6619093761 38 bshutdown = true;
henryeherman 1:4e6619093761 39 }
henryeherman 1:4e6619093761 40
henryeherman 1:4e6619093761 41 void MCP3202::enable() {
henryeherman 1:4e6619093761 42 bshutdown = false;
henryeherman 1:4e6619093761 43 }
henryeherman 1:4e6619093761 44
henryeherman 1:4e6619093761 45 void MCP3202::configspi() {
henryeherman 1:4e6619093761 46 _spi.format(8, 0);
henryeherman 1:4e6619093761 47 //_spi.frequency();
henryeherman 1:4e6619093761 48 }
henryeherman 1:4e6619093761 49
henryeherman 1:4e6619093761 50 void MCP3202::sendValue(int value) {
henryeherman 1:4e6619093761 51 select();
henryeherman 1:4e6619093761 52 _spi.write(value);
henryeherman 1:4e6619093761 53 deselect();
henryeherman 1:4e6619093761 54 }
henryeherman 1:4e6619093761 55
henryeherman 1:4e6619093761 56 void MCP3202::select() {
henryeherman 1:4e6619093761 57 //Set CS low to start transmission (interrupts conversion)
henryeherman 1:4e6619093761 58 configspi();
henryeherman 1:4e6619093761 59 selectfxn();
henryeherman 1:4e6619093761 60 }
henryeherman 1:4e6619093761 61
henryeherman 1:4e6619093761 62 void MCP3202::deselect() {
henryeherman 1:4e6619093761 63 //Set CS high to stop transmission (restarts conversion)
henryeherman 1:4e6619093761 64 unselectfxn();
henryeherman 1:4e6619093761 65 }