Diff: main.cpp

Revision:

1:b80a3bb34555

Parent:

0:ca31694551ed

--- a/main.cpp	Tue Sep 20 14:03:10 2011 +0000
+++ b/main.cpp	Mon Sep 22 10:18:28 2014 +0000
@@ -1,35 +1,151 @@
 #include "mbed.h"
 #include "DebounceIn.h"
-// must import Cookbook Debounce library into project
-// URL: http://mbed.org/users/AjK/libraries/DebounceIn/lky9pc
+#include "USBKeyboard.h"
+
+// Serial connection for debugging
+Serial pc(USBTX, USBRX);
+// mimic USB keyboard
+USBKeyboard keyboard;
+// LED
+DigitalOut red(LED_RED);
+DigitalOut green(LED_GREEN);
+DigitalOut blue(LED_BLUE);
+// Push Buttons with Debounce 
+DebounceIn pb1(D2);
+DebounceIn pb2(D3);
+DebounceIn pb3(D4);
+DebounceIn pb4(D5);
+DebounceIn pb5(D6);
 
-DigitalOut myled(LED1);
-DigitalOut myled2(LED2);
-DigitalOut myled3(LED3);
-DigitalOut myled4(LED4);
+// chord character map      
+char chord_characters[32] = { 
+    '?', // 00000 0
+    'e', // 00001 1
+    'd', // 00010 2
+    'i', // 00011 3
+    'c', // 00100 4
+    'l', // 00101 5
+    'h', // 00110 6
+    'v', // 00111 7
+    'b', // 01000 8
+    'n', // 01001 9
+    'k', // 01010 10
+    'u', // 01011 11
+    'g', // 01100 12
+    't', // 01101 13
+    's', // 01110 14
+    ' ', // 01111 15 SPACE
+    'a', // 10000 16
+    'o', // 10001 17
+    'm', // 10010 18
+    'y', // 10011 19
+    'j', // 10100 20
+    'x', // 10101 21
+    'r', // 10110 22
+    '?', // 10111 23
+    'f', // 11000 24
+    'w', // 11001 25
+    'q', // 11010 26
+    'z', // 11011 27
+    'p', // 11100 28
+    '?', // 11101 29
+    '\b', // 11110 30
+    '\n', // 11111 31
+};
+  
+// print binary representation of char for debugging                     
+void printbinchar(char c)
+{
+    for (int i = 7; i >= 0; --i)
+    {
+        pc.printf("%c", ( (c & (1 << i)) ? '1' : '0' ));
+    }
+    pc.printf("\r\n");
+}
 
-DebounceIn pb(p8);
-// SPST Pushbutton count demo using internal PullUp function
-// no external PullUp resistor needed
-// Pushbutton from P8 to GND.
-// Demonstrates need for debounce - will not count more than once per button hit
-// This ocuurs on all switches due to mechanical contact bounce
-int main()
-{ 
-int count=0;
-int old_pb=0;
-int new_pb;
-    // Use internal pullup for pushbutton
-    pb.mode(PullUp);
-    // Delay for initial pullup to take effect
-    wait(.001);
-    while(1) {
-        new_pb = pb;
-        if ((new_pb==0) && (old_pb==1)) count++;
-        myled4 = count & 0x01;
-        myled3 = (count & 0x02)>>1;
-        myled2 = (count & 0x04)>>2;
-        myled = (count & 0x08)>>3;
-        old_pb = new_pb;
+void setup() {
+    // use internal pullup for pushbuttons
+    pb1.mode(PullUp);
+    pb2.mode(PullUp);
+    pb3.mode(PullUp);
+    pb4.mode(PullUp);
+    pb5.mode(PullUp);
+    // delay for initial pullup to take effect
+    wait(0.1);
+    // setup LED's
+    red = 1, green = 1, blue = 1;
+}
+
+int main() {
+    setup();
+    int keycode = 0;
+    while(1) {        
+        // determine which push buttons are depressed
+        if(!pb1){ keycode |= 1; }
+        if(!pb2){ keycode |= 2; }
+        if(!pb3){ keycode |= 4; }
+        if(!pb4){ keycode |= 8; }
+        if(!pb5){ keycode |= 16; }
+        // when all buttons are released and some buttons were previously depressed
+        if(pb1 && pb2 && pb3 && pb4 && pb5 && keycode)
+        {
+            int chr = chord_characters[keycode];
+            pc.printf("%c", chr);
+            keyboard.printf("%c", chr);
+            
+            //pc.printf("%d, %c\r\n", chr, chr);
+            //printbinchar(chr);
+            //printbinchar(keycode);
+            keycode = 0;
+        }
     }
-}
\ No newline at end of file
+}
+
+//=============================
+// python code to generate chord_characters array
+// import binascii
+//
+// chord_map = {
+//       "10000":"a",
+//       "01000":"b",
+//       "00100":"c",
+//       "00010":"d",
+//       "00001":"e",
+//       "11000":"f",
+//       "01100":"g",
+//       "00110":"h",
+//       "00011":"i",
+//       "10100":"j",
+//       "01010":"k",
+//       "00101":"l",
+//       "10010":"m",
+//       "01001":"n",
+//       "10001":"o",
+//       "11100":"p",
+//       "11010":"q",
+//       "10110":"r",
+//       "01110":"s",
+//       "01101":"t",
+//       "01011":"u",
+//       "00111":"v",
+//       "11001":"w",
+//       "10101":"x",
+//       "10011":"y",
+//       "11011":"z",
+//       "11110":"?",  
+//       "10111":"?",
+//       "11101":"?",
+//       "01111":" ",
+//       "11111":"?",
+//       }
+//
+// if __name__ == '__main__':
+//     array = [0] * 32
+//         for k, v in chord_map.iteritems():
+//             array[ int(k, 2) ] = k
+//         for i in range(len(array)):
+//             try:
+//                 print "'" + chord_map[array[i]] + "', //", array[i], i
+//             except KeyError:
+//                 print "'" + "?" + "', //", array[i], i
+//===================================================
\ No newline at end of file