Diff: main.cpp

Revision:

0:893e598b3e49

Child:

1:fb9ce7e54c8d

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Fri Jan 30 23:41:05 2015 +0000
@@ -0,0 +1,249 @@
+/*
+#include "mbed.h"
+
+PwmOut pwm1(p25);
+
+int main() {
+    while(1) {
+        for (float p = 0.0f; p < 1.0f; p += 0.1f) {
+            pwm1 = p;
+            wait(0.4);
+        }
+    }
+}
+*/
+
+/* 
+ * ESE 519, Spring 2015, Lab 1
+ * Part 5
+ * Peter Gebhard, pgeb@seas.upenn.edu
+ * Yifeng Yuan, yifengy@seas.upenn.edu
+ */
+ 
+#include "mbed.h"
+
+int global_code; //global variable
+                 //-1 - error
+                 //1 - dot
+                 //0 - dash
+                 //2 - space
+int global_buffer; //stores the codes of each letter
+int global_length; //stores the length of a coded word
+
+//Timeout wait_for_timeout;
+Timer t;
+InterruptIn en1(p21); //declear en1 as interrupt input using pin 21
+DigitalOut led1(LED1);
+InterruptIn en2(p22); //declear en2 as interrupt input using pin 22
+DigitalOut led2(LED2);
+DigitalOut led3(p23);
+DigitalOut led4(p24);
+PwmOut pwm1(p25);
+
+
+void released();
+void depressed();
+void speaker();
+void light_7seg();
+char morse2char(int morse, int length);
+int hard_limiter(int duration);
+
+char word[10];
+int letter[5];
+
+void depressed() {
+    t.stop();
+    int duration = t.read_ms();
+    char letter;
+    if (duration > 400) {
+        //convert code into letter
+        letter = morse2char(global_buffer,global_length);
+        //display letter
+        printf("%c\n", letter);
+        //clear buffer
+        global_buffer = 0;
+        //clear length
+        //printf("%d\n",global_length);
+        global_length = 0;
+        
+        //a space is detected
+        global_code = 2;
+        //printf("You pressed the key %d\n", global_code);
+        letter = ' ';
+        //print letter
+        printf("%c\n",letter);
+    }
+    t.reset();
+    t.start();
+}
+
+void released() {
+    t.stop();
+    int duration = t.read_ms();
+    global_code = hard_limiter(duration);
+    //printf("You pressed the key %d\n", global_code);
+    //append the new code into buffer
+    global_buffer = global_buffer << 1;
+    global_buffer = global_buffer + global_code;
+    //printf("%d\n",global_buffer);
+    //keep tracking length of code
+    global_length = global_length + 1;
+    light_7seg();
+    speaker();
+    t.reset();
+    t.start();
+        
+}
+
+void speaker() {
+    if (global_code == 1) {
+        pwm1 = 0.2f;
+        wait(0.1);
+        pwm1 = 0.0f;
+        }
+    if (global_code == 0) {
+        pwm1 = 0.2f;
+        wait(0.3);
+        pwm1 = 0.0f;
+        }
+}
+
+void light_7seg() {
+    
+    if (global_code == 1) {
+        led3 = 0;
+        wait(0.2);
+        led3 = 1;
+    }
+    if (global_code == 0) {
+        led4 = 0;
+        wait(0.2);
+        led4 = 1;
+        }
+    
+}
+
+int hard_limiter(int duration) {
+    
+    int symbol;
+    
+    if (duration >= 30 && duration <= 200){
+        symbol = 1;
+        }
+    else if (duration > 200) {
+        symbol = 0;
+        }
+    else {
+        symbol = -1;
+        }
+    return symbol;
+    
+}
+/*
+int morseStr2int(char* morse) {}
+*/
+
+char morse2char(int morse, int length) {
+    switch (length) {
+        case 1: 
+            switch (morse) {
+                case 0:
+                    return 'T';
+                case 1:
+                    return 'E';    
+            }
+        case 2:
+            switch (morse) {
+                case 0:
+                    return 'M';
+                case 1:
+                    return 'N';
+                case 2:
+                    return 'A';
+                case 3:
+                    return 'I'; 
+            }
+        case 3:
+            switch (morse) {
+                case 0:
+                    return 'O';
+                case 1:
+                    return 'G';
+                case 2:
+                    return 'K';
+                case 3:
+                    return 'D';       
+                case 4:
+                    return 'W';
+                case 5:
+                    return 'R';
+                case 6:
+                    return 'U';
+                case 7:
+                    return 'S'; 
+            }
+        case 4:
+            switch (morse) {
+                case 2:
+                    return 'Q';
+                case 3:
+                    return 'Z';
+                case 4:
+                    return 'Y';
+                case 5:
+                    return 'C';
+                case 6:
+                    return 'X';
+                case 7:
+                    return 'B';
+                case 8:
+                    return 'J';
+                case 9:
+                    return 'P';
+                case 11:
+                    return 'L';
+                case 13:
+                    return 'F';
+                case 14:
+                    return 'V';
+                case 15:
+                    return 'H';
+            }
+        case 5:
+            switch (morse) {
+                case 0:
+                    return '0';
+                case 1:
+                    return '9';
+                case 3:
+                    return '8';
+                case 7:
+                    return '7';
+                case 15:
+                    return '6';
+                case 31:
+                    return '5';
+                case 30:
+                    return '4';
+                case 28:
+                    return '3';
+                case 24:
+                    return '2';
+                case 16:
+                    return '1';
+            }
+    }
+}
+
+int main() {
+
+     led3 = 1;
+     led4 = 1;
+     en1.rise(&depressed);
+     en1.fall(&released);
+     t.start();
+  
+     while (1) {
+        wait(0.5);
+        }
+}
\ No newline at end of file