ADC128S.cpp

00001 // ADC128S   a library for the National Semiconductor ADC128S family of ADCs
00002 //
00003 // by Michael Shimniok - http://www.bot-thoughts.com/
00004 //
00005 #include "mbed.h"
00006 #include "ADC128S.h"
00007 
00008 ADC128S::ADC128S(PinName mosi, PinName miso, PinName sck, PinName cs) : _adc(mosi, miso, sck), _cs(cs), _channel(0) {
00009     _adc.format(16,3);
00010     _adc.frequency(8000000);
00011 }
00012 
00013 int ADC128S::getChannel() {
00014     return _channel;
00015 }
00016 
00017 void ADC128S::setChannel(int channel) {
00018     _cs = 0;
00019     _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
00020     _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
00021     _cs = 1;
00022     _channel = channel;
00023 }
00024 
00025 unsigned int ADC128S::read() {
00026     unsigned int result = 0;
00027     _cs = 0;
00028     // get next acquisition, send next channel: XXXAAAXX XXXXXXXX
00029     _channel++;
00030     _channel %= 8;
00031     result = _adc.write(_channel<<11);
00032     _cs = 1;
00033     
00034     return result;
00035 }
00036 
00037 unsigned int ADC128S::read(int channel) {
00038     unsigned int result = 0;
00039     _cs = 0;
00040     _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
00041     _cs = 1;
00042     wait_us(50);
00043     _cs = 0;
00044     result = _adc.write(channel<<11); // get next acquisition
00045     _cs = 1;
00046     
00047     return result;
00048 }