MCP3204.cpp

00001 /* mbed MCP3204 Library, for driving the 2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI™ Serial Interface
00002  * Copyright (c) 2015, Created by Steen Joergensen (stjo2809)
00003  *
00004  * Permission is hereby granted, free of charge, to any person obtaining a copy
00005  * of this software and associated documentation files (the "Software"), to deal
00006  * in the Software without restriction, including without limitation the rights
00007  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00008  * copies of the Software, and to permit persons to whom the Software is
00009  * furnished to do so, subject to the following conditions:
00010  *
00011  * The above copyright notice and this permission notice shall be included in
00012  * all copies or substantial portions of the Software.
00013  *
00014  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00015  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00016  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00017  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00018  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00019  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00020  * THE SOFTWARE.
00021  */
00022  
00023  #include "mbed.h"
00024  #include "MCP3204.h"
00025  
00026 //=============================================================================
00027 // Public functions
00028 //=============================================================================
00029 
00030     MCP3204::MCP3204(SPI& spi, PinName nCs) : _spi(spi), _nCs(nCs)
00031     {
00032         
00033     }
00034     
00035     
00036     MCP3204::MCP3204(PinName mosi, PinName miso,PinName sck, PinName nCs) : _mosi(mosi), _miso(miso), _sck(sck), _nCs(nCs)
00037     {
00038         SPI _spi(_mosi,_miso,_sck);    
00039     }
00040     
00041      
00042     int MCP3204::sgl(char channel)
00043     {
00044         return _read(SINGLE, channel);    
00045     }
00046         
00047     int MCP3204::diff(char channel)
00048     {
00049         return _read(DIFFERENTIAL, channel);    
00050     }
00051     
00052 //=============================================================================
00053 // Private functions
00054 //=============================================================================
00055     
00056     int MCP3204::_make_value_from_responce(int _msb, int _lsb)
00057     {
00058         --- code --- 
00059     }
00060         
00061     int MCP3204::_read(char sgl_or_diff, char channel)
00062     {
00063         _make_value_from_responce(int responce_msb, int responce_lsb);
00064         
00065         _nCs = 0;
00066         _spi.write(sgl_or_diff);
00067         int responce_msb = _spi.write(channel);
00068         int responce_lsb = _spi.write(0xff);                           // don't care bits
00069         _nCs = 1;
00070         
00071         int responce = _make_value_from_responce(responce_msb, responce_lsb);
00072         
00073         return responce;     
00074     }