Diff: main.cpp

Revision:

1:1e34feaa7774

Parent:

0:4b55d56b6b61

Child:

2:012e56772666

--- a/main.cpp	Sun Feb 20 13:15:46 2011 +0000
+++ b/main.cpp	Mon Jan 04 05:00:13 2016 +0000
@@ -2,6 +2,7 @@
 
 #include "mbed.h"
 #include "USBMIDI.h"
+#include "MovingAverage.h"
 
 void show_message(MIDIMessage msg) {
     switch (msg.type()) {
@@ -22,16 +23,64 @@
     }    
 }
 
+static const int MIDI_MAX_VALUE = 16384;
+static const float MIDI_MAX_VALUE_F = 16384.0f;
+
+
+static const float TOLERANCE = 0.01f;
+static const int NOISE_FLOOR = 600;
+
+static const float LOWER_TOLERANCE = 0.016f;
+static const float LOWER_TOLERANCE_BEGIN = 0.34f;
+
 USBMIDI midi;
+AnalogIn pot1(p20);
+Serial pc(USBTX, USBRX); // tx, rx
+
+void write_full_cc(int controlmsb, int controllsb, int channel, int value){
+    int lsb = value / 128; //value & 0x7F;
+    int msb = value % 128; //value & 0x7F80 >> 7;
+    midi.write(MIDIMessage::ControlChange(controlmsb, msb, channel));
+    midi.write(MIDIMessage::ControlChange(controllsb, lsb, channel));
+}
+
+#define SMOOTHING_AMOUNT 500
 
-int main() {          
+int main() {
+    //MovingAverage <float>vavg(100,0.0);          
     midi.attach(show_message);         // call back for messages received    
-    while (1) {    
-        for(int i=48; i<83; i++) {     // send some messages!
+    
+    float last_value  = 0.0f;
+    while (1) {   
+        //float values[SMOOTHING_AMOUNT] = {0.0f}; 
+        float counter=0.0f;
+        for(int i=0;i<SMOOTHING_AMOUNT;i++){
+            wait_us(10);
+            counter+=pot1;
+        }
+        float value = counter / SMOOTHING_AMOUNT;
+        int midi_value = (int)(MIDI_MAX_VALUE_F * value);
+        
+        //at low voltage noise takes over..
+        if(midi_value < NOISE_FLOOR){
+            value = 0.0f;
+            midi_value = 0;
+        }
+        if(value - last_value > TOLERANCE || value - last_value < -TOLERANCE){
+            //as we approach noise floor, things get noisey.. 
+            if(value < LOWER_TOLERANCE_BEGIN && !(value - last_value > LOWER_TOLERANCE || value - last_value < -LOWER_TOLERANCE)){
+                continue;
+            }
+            pc.printf("sent: %f, %i\r\n", value, midi_value);
+            last_value = value;
+            write_full_cc(20, 52, 0, midi_value);
+       }
+        
+        /*for(int i=48; i<83; i++) {     // send some messages!
             midi.write(MIDIMessage::NoteOn(i));
             wait(0.25);
             midi.write(MIDIMessage::NoteOff(i));
             wait(0.5);
-        }
+        }*/
     }
 }