Arduino based controller for Twisted Pear Opus DAC and S/PDIF Mux.
This code is designed to run on the LCDuino, an Arduino based controller from Linux Works and AMB Labs. Originally intended for the AMB Labs components I have used it to control the Twisted Pear WM8741 based DAC and CS8416 based multiplexer.
- LinuxWorks Labs: http://www.netstuff.org/audio/
- AMB Laboratories: http://www.amb.org/audio/
- Twisted Pear Audio: http://www.twistedpearaudio.com/
I started with the Volu-Master source designed for the LCDuino in an AMB system. I modified it to use spare outputs on the Arduino to control the Mux, the existing i2c bus is used to program the DAC.
Over time the code has changed greatly such that it's no longer suitable for the AMB system. A lot of the flexibility and configurability has gone but in return I have a much smaller code base that I can understand and fit in my head.
Some key parts of the original code remain:
- The IR receiver and learning code is basically the same but I restrict myself to just the Sony protocol.
- The Motor-pot code is re-arranged but the algorithm is the same.
- Programming of the LCD via the i2 port expander hasn't changed too much.
- The realtime clock code hasn't changed much.
Things I've changed:
- Updates to support Arduino 1.0
- Split IR, RTC and Pot functions into separate files.
- Function and variable names so they make more sense to me.
- Fewer global variables and more functions with return values.
- Fewer cross-deps between functions and files.
- Separate files for LCD, RTC, Volume and other functions.
- Just about everything to do with the UI.
Things I've added:
- Code to init and control the WM8741 DAC.
- Code to select the input on the CS8416 Mux.
- Large numeral font for clock, volume and input display.
Things I've removed:
- Many configuration options.
- Code to support AMB input switching etc.