Michael Shimniok / ADC128S

Driver for National Semiconductor ADC128Sxxx family of analog to digital converters

ADC128S.cpp@2:f6c4a79f2ee0, 2011-04-27 (annotated)

Committer:
shimniok
Date:
Wed Apr 27 19:07:26 2011 +0000
Revision:
2:f6c4a79f2ee0
Parent:
1:0edd6142cd67 
added methods to set channel, get current channel, and changed behavior of channel read method to permit sequential reads on each channel.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
shimniok 0:28addf1f4c26 1 // ADC128S a library for the National Semiconductor ADC128S family of ADCs
shimniok 0:28addf1f4c26 2 //
shimniok 0:28addf1f4c26 3 // by Michael Shimniok - http://www.bot-thoughts.com/
shimniok 0:28addf1f4c26 4 //
shimniok 0:28addf1f4c26 5 #include "mbed.h"
shimniok 0:28addf1f4c26 6 #include "ADC128S.h"
shimniok 0:28addf1f4c26 7
shimniok 2:f6c4a79f2ee0 8 ADC128S::ADC128S(PinName mosi, PinName miso, PinName sck, PinName cs) : _adc(mosi, miso, sck), _cs(cs), _channel(0) {
shimniok 0:28addf1f4c26 9 _adc.format(16,3);
shimniok 0:28addf1f4c26 10 _adc.frequency(8000000);
shimniok 0:28addf1f4c26 11 }
shimniok 0:28addf1f4c26 12
shimniok 2:f6c4a79f2ee0 13 int ADC128S::getChannel() {
shimniok 2:f6c4a79f2ee0 14 return _channel;
shimniok 2:f6c4a79f2ee0 15 }
shimniok 2:f6c4a79f2ee0 16
shimniok 2:f6c4a79f2ee0 17 void ADC128S::setChannel(int channel) {
shimniok 2:f6c4a79f2ee0 18 _cs = 0;
shimniok 2:f6c4a79f2ee0 19 _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
shimniok 2:f6c4a79f2ee0 20 _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
shimniok 2:f6c4a79f2ee0 21 _cs = 1;
shimniok 2:f6c4a79f2ee0 22 _channel = channel;
shimniok 2:f6c4a79f2ee0 23 }
shimniok 2:f6c4a79f2ee0 24
shimniok 2:f6c4a79f2ee0 25 unsigned int ADC128S::read() {
shimniok 2:f6c4a79f2ee0 26 unsigned int result = 0;
shimniok 2:f6c4a79f2ee0 27 _cs = 0;
shimniok 2:f6c4a79f2ee0 28 // get next acquisition, send next channel: XXXAAAXX XXXXXXXX
shimniok 2:f6c4a79f2ee0 29 _channel++;
shimniok 2:f6c4a79f2ee0 30 _channel %= 8;
shimniok 2:f6c4a79f2ee0 31 result = _adc.write(_channel<<11);
shimniok 2:f6c4a79f2ee0 32 _cs = 1;
shimniok 2:f6c4a79f2ee0 33
shimniok 2:f6c4a79f2ee0 34 return result;
shimniok 2:f6c4a79f2ee0 35 }
shimniok 2:f6c4a79f2ee0 36
shimniok 0:28addf1f4c26 37 unsigned int ADC128S::read(int channel) {
shimniok 0:28addf1f4c26 38 unsigned int result = 0;
shimniok 0:28addf1f4c26 39 _cs = 0;
shimniok 0:28addf1f4c26 40 _adc.write(channel<<11); // send channel for next acquisition; XXXAAAXX XXXXXXXX
shimniok 2:f6c4a79f2ee0 41 _cs = 1;
shimniok 2:f6c4a79f2ee0 42 wait_us(50);
shimniok 2:f6c4a79f2ee0 43 _cs = 0;
shimniok 0:28addf1f4c26 44 result = _adc.write(channel<<11); // get next acquisition
shimniok 0:28addf1f4c26 45 _cs = 1;
shimniok 0:28addf1f4c26 46
shimniok 0:28addf1f4c26 47 return result;
shimniok 2:f6c4a79f2ee0 48 }