main.cpp

00001 #include "mbed.h"
00002 Serial pc(USBTX, USBRX); // tx, rx
00003  
00004 DigitalIn switch1(D13); // input switch
00005 DigitalOut led(D12); // light on.
00006 
00007 AnalogIn p1(A0);
00008 AnalogIn p2(A1);
00009 AnalogIn p3(A2);
00010 AnalogIn p4(A3);
00011 AnalogIn p5(A4);
00012 
00013 int sw1 = 0; // input variable
00014 
00015 int p1s=0; // individual input with switches
00016 int p2s=0;
00017 int p3s=0;
00018 int p4s=0;
00019 int p5s=0;
00020 
00021 float ps[] = {0, 0, 0, 0, 0};
00022 int psl[] = {0,0,0,0,0};
00023 
00024 int binary = 0; // binary input
00025 int ascii_c = 0; // capital
00026 int ascii_l = 0; // lower letter
00027 bool CAPS =0;// Caps Lock history variable.
00028 
00029 bool lastButton = 0;
00030 bool currentButton = 0; 
00031 bool current =0;
00032 
00033 bool debounce(bool last) // function for debounce
00034 {
00035     sw1 = switch1.read(); // reads current switch status
00036     current = sw1;
00037     if (last != current)
00038     {
00039         wait(0.01); //eliminating bouncing with delayx
00040         current = sw1;    
00041     }
00042     return current;        
00043 }
00044 
00045 int encode(int reading)
00046 {
00047     ps[0] = p1.read();
00048     ps[1] = p2.read();
00049     ps[2] = p3.read();
00050     ps[3] = p4.read();
00051     ps[4] = p5.read();
00052     for(int i =0;i<5;i++)
00053     {
00054     if(ps[i]>0.005)
00055     {
00056         psl[i] =1;
00057     }
00058     else 
00059     {
00060         psl[i] =0;
00061     }
00062     }
00063     binary = psl[4]*16 + psl[3]*8 + psl[2]*4+psl[1]*2+psl[0]*1;
00064     return binary;
00065     }
00066 
00067 int main(){
00068  
00069     while(1)
00070     {
00071     led =1;  // led on!
00072         
00073     currentButton = debounce(lastButton);
00074     if (lastButton ==0 && currentButton ==1)
00075     {
00076     encode(binary);
00077     if(binary<=25)// 0-25 : A-Z.
00078     {
00079     switch(CAPS)
00080     {
00081     case 0 : // Capital
00082     ascii_c = binary + 65; 
00083     pc.printf("%c",ascii_c);
00084     break ;
00085     
00086     case 1 : //lower case    
00087     ascii_c = binary +97;
00088     pc.printf("%c",ascii_c);
00089     break;
00090     
00091     }
00092     }
00093     //else if for CAPS
00094     else
00095     {
00096         switch(binary)
00097         {
00098             case 26 :
00099             ascii_c = binary + 20; // prints out '.' 
00100             pc.printf("%c",ascii_c);   
00101             break;
00102             
00103             case 27 :
00104             ascii_c = binary + 36; // prints out '?' 
00105             pc.printf("%c",ascii_c);   
00106             break;
00107             
00108             case 28 :
00109             ascii_c = binary + 4; // prints out 'space' 
00110             pc.printf("%c",ascii_c);   
00111             break;
00112             
00113             case 29 :
00114             ascii_c = binary -21; // backspace
00115             pc.printf("%c",ascii_c);   
00116             break;
00117             
00118             case 30 :
00119             ascii_c = binary - 17; // prints out 'enter' 
00120             pc.printf("\n%c",ascii_c);   
00121             break;
00122             
00123             case 31 : //CAPS Lock 
00124             CAPS =! CAPS;
00125             break;
00126     
00127             }
00128     }
00129     
00130     }    
00131     lastButton = currentButton;
00132 
00133     }
00134 }