Johnny Yam / MCP4XXX

simple MCP4XXX digital potentiometer library

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MCP4XXX.cpp

00001 #include "MCP4XXX.h"
00002 
00003 MCP4XXX::MCP4XXX(PinName miso, PinName mosi, PinName clk, PinName cs) {
00004     _cs = new DigitalOut(cs);
00005     _spi = new SPI(miso, mosi, clk);
00006     _spi->format(8,0);
00007     _spi->frequency(1000000);
00008     _lvl = 0x00;
00009 }
00010 
00011 MCP4XXX::~MCP4XXX()
00012 {
00013     delete _cs;
00014     delete _spi;
00015 }
00016 
00017 void MCP4XXX::setLevel(unsigned char lvl, bool isP0) {
00018     *_cs = 0;
00019     if (isP0)
00020         _spi->write(P0_ADDR);
00021     else 
00022         _spi->write(P1_ADDR);
00023     _spi->write(lvl);
00024     *_cs = 1;
00025     _lvl = lvl;
00026 }
00027 
00028 unsigned char MCP4XXX::getLevel() {
00029     return _lvl;
00030 }
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