Otto Zeides
main.cpp@0:835b0c5a6f94, 2009-11-26 (annotated)
- Committer:
- oczeides
- Date:
- Thu Nov 26 13:07:50 2009 +0000
- Revision:
- 0:835b0c5a6f94
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| oczeides | 0:835b0c5a6f94 | 1 | //---------------------------------------------------------------------------------------- |
| oczeides | 0:835b0c5a6f94 | 2 | // Project: MIDIExpressionPedal |
| oczeides | 0:835b0c5a6f94 | 3 | // Function: use the mbed board to convert a potentiometr into a MIDI expression pedal |
| oczeides | 0:835b0c5a6f94 | 4 | // Author: Dr.-Ing. O.C. Zeides, using some code from the Cookbook |
| oczeides | 0:835b0c5a6f94 | 5 | // Version: 26.11.2009 |
| oczeides | 0:835b0c5a6f94 | 6 | //---------------------------------------------------------------------------------------- |
| oczeides | 0:835b0c5a6f94 | 7 | |
| oczeides | 0:835b0c5a6f94 | 8 | #include "mbed.h" |
| oczeides | 0:835b0c5a6f94 | 9 | #include "MIDI.h" |
| oczeides | 0:835b0c5a6f94 | 10 | |
| oczeides | 0:835b0c5a6f94 | 11 | MIDI midi(p13, p14); // our MIDI communication channel |
| oczeides | 0:835b0c5a6f94 | 12 | DigitalOut myled(LED1); // status LED, should flash if we update the controller |
| oczeides | 0:835b0c5a6f94 | 13 | AnalogIn potentiometer(p20); // here is where we connect our potentiometer |
| oczeides | 0:835b0c5a6f94 | 14 | |
| oczeides | 0:835b0c5a6f94 | 15 | float last_pot = 0.0; // memorize the old potentiometer value |
| oczeides | 0:835b0c5a6f94 | 16 | float actual_pot; // actual poentiometer value |
| oczeides | 0:835b0c5a6f94 | 17 | float hysterese = 0.1; // only send new message if we have moved the potentiometer that far |
| oczeides | 0:835b0c5a6f94 | 18 | float fvalue = 0.0; |
| oczeides | 0:835b0c5a6f94 | 19 | |
| oczeides | 0:835b0c5a6f94 | 20 | int controllerNo = 1; // MIDI controller No |
| oczeides | 0:835b0c5a6f94 | 21 | int channelNo = 1; // MIDI channel No. |
| oczeides | 0:835b0c5a6f94 | 22 | int value = 0; // MIDI value for controller |
| oczeides | 0:835b0c5a6f94 | 23 | |
| oczeides | 0:835b0c5a6f94 | 24 | // send the new value to the controller |
| oczeides | 0:835b0c5a6f94 | 25 | void updateMIDIController(void) |
| oczeides | 0:835b0c5a6f94 | 26 | { |
| oczeides | 0:835b0c5a6f94 | 27 | myled = 1; |
| oczeides | 0:835b0c5a6f94 | 28 | fvalue = actual_pot * 127.0; |
| oczeides | 0:835b0c5a6f94 | 29 | value = (int) fvalue; |
| oczeides | 0:835b0c5a6f94 | 30 | midi.controller(controllerNo,value,channelNo); |
| oczeides | 0:835b0c5a6f94 | 31 | wait(0.5); |
| oczeides | 0:835b0c5a6f94 | 32 | myled = 0; |
| oczeides | 0:835b0c5a6f94 | 33 | } // updateMIDIController() |
| oczeides | 0:835b0c5a6f94 | 34 | |
| oczeides | 0:835b0c5a6f94 | 35 | int main() { |
| oczeides | 0:835b0c5a6f94 | 36 | |
| oczeides | 0:835b0c5a6f94 | 37 | while(1) { // do forever |
| oczeides | 0:835b0c5a6f94 | 38 | // get new pot value |
| oczeides | 0:835b0c5a6f94 | 39 | actual_pot = potentiometer; |
| oczeides | 0:835b0c5a6f94 | 40 | // compare with last pot value |
| oczeides | 0:835b0c5a6f94 | 41 | if(actual_pot > (last_pot + hysterese)) |
| oczeides | 0:835b0c5a6f94 | 42 | updateMIDIController(); |
| oczeides | 0:835b0c5a6f94 | 43 | if(actual_pot < (last_pot - hysterese)) |
| oczeides | 0:835b0c5a6f94 | 44 | updateMIDIController(); |
| oczeides | 0:835b0c5a6f94 | 45 | |
| oczeides | 0:835b0c5a6f94 | 46 | last_pot = actual_pot; |
| oczeides | 0:835b0c5a6f94 | 47 | |
| oczeides | 0:835b0c5a6f94 | 48 | } // while |
| oczeides | 0:835b0c5a6f94 | 49 | |
| oczeides | 0:835b0c5a6f94 | 50 | } // main() |
| oczeides | 0:835b0c5a6f94 | 51 | |
| oczeides | 0:835b0c5a6f94 | 52 | |
| oczeides | 0:835b0c5a6f94 | 53 |