Diff: main.cpp

Revision:

0:c1136e029881

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu Oct 07 20:59:36 2010 +0000
@@ -0,0 +1,149 @@
+
+
+// My first code for the mbed.
+// Blinks "HELLO WORLD" out in Morse Code on LED1
+// Repeats forever
+//
+
+
+#include "mbed.h"
+
+#define WAIT_time 0.20      // about 5 wpm
+#define D() wait(WAIT_time)
+
+DigitalOut myled1(LED1);
+
+
+void send_dah();
+void send_dit();
+void send_space();
+void send_morse(char);
+void blink_out(char *ptr);
+ 
+ 
+char temp1;
+char rotate_char;
+char loops;
+char morse;
+ 
+ 
+ 
+// Offset 0x2C for ASCII to Morse code character pattern conversion
+// 0xFF means it is not a valid Morse code character
+
+// Characters are packed this way: Bits are rotated right until a "1". After that, "1" is a Dah, "0" is a Dit.
+// So, pad the LSBits with "0"s until the 8 bits represent a valid Morse Code charater.
+char mcode[100]=
+{
+ 0xCE,0xFF,0xAA,0xFF,
+ 0xFC,0xF4,0xE4,0xC4,0x84,0x04,0x0C,0x1C,0x3C,0x7C,     
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0x32,0xFF,
+ 
+ 0xA0,0x18,0x58,0x30,0x40,0x48,0x70,0x08,0x20,0xE8,
+ 0xB0,0x28,0xE0,0x60,0xF0,0x68,0xB1,0x50,0x10,0xC0,
+ 0x90,0x81,0xD0,0x91,0xD8,0x31,
+
+ 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
+
+ 0xA0,0x18,0x58,0x30,0x40,0x48,0x70,0x08,0x20,0xE8,
+ 0xB0,0x28,0xE0,0x60,0xF0,0x68,0xB1,0x50,0x10,0xC0,
+ 0x90,0x81,0xD0,0x91,0xD8,0x31,
+};
+
+
+
+int main() {
+
+    myled1 = 0;
+    
+    while(1) {
+        blink_out("HELLO WORLD");
+        send_space();
+
+    }   
+      
+}        
+        
+        
+void send_morse(char morse) {
+        
+    rotate_char = 0x01;            // set up mask bit 
+    loops = 0x00;
+    do {
+        rotate_char <<= 1;
+        loops++;
+    }while ((morse & rotate_char) == 0);
+        
+    rotate_char <<= 1;
+    loops++;
+
+    do {
+        if ((morse & rotate_char) == 0)       // if it is a zero, send a dit
+            send_dit();
+
+        else
+            send_dah();
+        
+        rotate_char <<= 1;
+        loops++;
+    
+    }while(loops < 8);                  // there are 8 bits 
+
+}
+
+
+
+void send_dit() {                      // dit is on one unit, off one unit 
+
+    myled1 = 1;
+    D();
+    myled1 = 0;
+    D();
+   
+}
+
+
+void send_dah() {                      // dah is on 2 units, off 1 unit 
+
+    myled1 = 1;
+    D();
+    D();
+    myled1 = 0;
+    D();
+    
+   
+}
+
+void send_space() {                   // space between words is 7 units 
+
+    D();
+    D();
+    D();
+    D();
+    D();
+    D();
+    D();
+
+}    
+
+
+void blink_out(char *ptr) {
+
+    while (*ptr)
+        {temp1 = *ptr++;
+       
+        if (temp1 == 0x20)
+                {send_space();
+                temp1 = *ptr++;
+                };
+            
+        temp1-= 0x2C;                       
+        morse = mcode[temp1];
+        send_morse(morse);
+        D();                                // 2 unit space
+        D();
+        }
+}
+
+
+