Revision 0:88f7ab41bdce, committed 2011-05-09

Comitter:

zarquin

Date:

Mon May 09 03:43:21 2011 +0000

Commit message:

Version 0.1

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon May 09 03:43:21 2011 +0000
@@ -0,0 +1,121 @@
+#include "mbed.h"
+
+DigitalOut myled(LED1);
+
+DigitalIn pushButton(p23);
+DigitalIn rotaryA(p21);
+DigitalIn rotaryB(p22);
+
+AnalogIn pressure(p20);
+AnalogIn pos1(p17);
+AnalogIn top(p16);
+AnalogIn bottom(p15);
+
+float wiper_f;
+float top_f;
+float bottom_f;
+float vol_f;
+float tmp_f;
+int tmp_i;
+
+float pressureAvg[4];
+float wiperAvg[4];
+
+AnalogOut signal(p18);
+
+Ticker sampleClock;
+// 16 entry sinewave table.
+char sineWave[]={127,175,216,244,255,244,216,175,127,78,37,9,0,9,36,78};
+
+char sawWave[]={0,16,31,47,64,79,95,111,127,143,159,175,191,207,223,255};
+
+unsigned int counter;
+unsigned  int counterSum;
+unsigned int counterLimit = 2147483647; //31 bits  2^31 - 1
+
+char temp;
+
+float byteToFloat(char in){
+    float i = in;
+    return (i/255.0)*0.5;
+}
+
+void sample2(){
+    
+
+
+}
+
+void sample(){
+ 
+    //useing a 31 bit counter.
+    counter = counter + counterSum;
+    if(counter > counterLimit){
+        //wrap the counting.
+        counter = counter - counterLimit;
+    }
+    
+    //Fout = CounterSum*Fclk/MaxCount
+    
+    temp = counter>>27;  //shift the top 4 bits down.
+    //float x = temp;
+    //signal.write(x/16.0);
+    
+    //write the output out 
+    signal.write(vol_f*byteToFloat(sineWave[temp]) +0.5);    
+}
+
+int read_encoder()
+{
+  int8_t enc_states[] = {0,-1,1,0,1,0,0,-1,-1,0,0,1,0,1,-1,0};
+  static char old_AB = 0;
+  /**/
+  old_AB <<= 2;
+  char x  = rotaryA.read();
+  x<<=1;
+  x = x+rotaryB.read();                 //remember previous state
+  old_AB |= ( x & 0x03 );  //add current state
+  return ( enc_states[( old_AB & 0x0f )]);
+}
+
+int main() {
+    
+    //setup variables.
+    tmp_i = 0;
+    counter = 0;
+    counterSum = 302365697;
+    counterSum = 18897856;
+    //counterSum = 1181116;
+    //18897856.1
+    
+    vol_f = 0.0;
+    
+    //hook up sample() to the ticker.  run the counter at 50kHz
+    sampleClock.attach_us(sample,20);
+    
+    while(1){
+        wiper_f = pos1.read();
+        bottom_f = bottom.read();
+        
+        if(wiper_f >= bottom_f){
+            // wiper is being pressed, play a note
+            top_f = top.read();
+            
+            tmp_f = 1.0 - (wiper_f - bottom_f)/(top_f - bottom_f);
+            
+            vol_f = 1.0 - pressure.read();
+            //ribbon is about 3 octaves worth.
+            //if the top is 440Hz = 18897856.1
+            //44Hz = 1889785.61
+            //55Hz is 2362232.013 //low A
+            tmp_i = (int)(16535624*tmp_f);
+            
+            counterSum = 2362232+ tmp_i;
+            
+        }else{
+            vol_f = 0.0;
+        }
+    
+    
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon May 09 03:43:21 2011 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/e2ac27c8e93e