Revision 0:835b0c5a6f94, committed 2009-11-26

Comitter:

oczeides

Date:

Thu Nov 26 13:07:50 2009 +0000

Commit message:

Changed in this revision

diff -r 000000000000 -r 835b0c5a6f94 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Nov 26 13:07:50 2009 +0000
@@ -0,0 +1,53 @@
+//----------------------------------------------------------------------------------------
+// Project:   MIDIExpressionPedal
+// Function:  use the mbed board to convert a potentiometr into a MIDI expression pedal
+// Author:    Dr.-Ing. O.C. Zeides, using some code from the Cookbook
+// Version:  26.11.2009
+//---------------------------------------------------------------------------------------- 
+
+#include "mbed.h"
+#include "MIDI.h"
+
+MIDI midi(p13, p14);           // our MIDI communication channel
+DigitalOut myled(LED1);        // status LED, should flash if we update the controller
+AnalogIn potentiometer(p20);   // here is where we connect our potentiometer
+
+float last_pot = 0.0;          // memorize the old potentiometer value
+float actual_pot;              // actual poentiometer value
+float hysterese = 0.1;         // only send new message if we have moved the potentiometer that far
+float fvalue = 0.0;
+
+int controllerNo = 1;          // MIDI controller No
+int channelNo = 1;             // MIDI channel No.
+int value = 0;                 // MIDI value for controller
+
+// send the new value to the controller
+void updateMIDIController(void)
+{
+   myled = 1;
+   fvalue = actual_pot * 127.0;
+   value = (int) fvalue;
+   midi.controller(controllerNo,value,channelNo);
+   wait(0.5);
+   myled = 0;
+} // updateMIDIController()
+
+int main() {
+   
+   while(1) { // do forever
+// get new pot value
+      actual_pot = potentiometer;
+// compare with last pot value  
+      if(actual_pot > (last_pot + hysterese))
+         updateMIDIController();
+      if(actual_pot < (last_pot - hysterese))
+         updateMIDIController();
+    
+      last_pot = actual_pot;   
+  
+   } // while
+   
+} // main()
+
+
+

diff -r 000000000000 -r 835b0c5a6f94 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Thu Nov 26 13:07:50 2009 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/32af5db564d4