main.cpp

00001  #include "mbed.h"
00002  
00003  #define numsamples 1
00004  int touchSense1(void);
00005  int touchSense2(void);
00006  void readSerial();
00007  char touchDetect ();
00008 
00009  DigitalOut myled1(LED1);
00010  DigitalOut myled2(LED2);
00011  DigitalOut myled3(LED3);
00012  AnalogIn input1(p20);
00013  DigitalIn charger1(p19);
00014  DigitalOut ground1(p18);
00015  AnalogIn input2(p17);
00016  DigitalIn charger2(p16);
00017  DigitalOut ground2(p15);
00018  
00019  
00020  Serial pc(USBTX, USBRX); // tx, rx
00021  
00022  char *serial = new char [100];
00023 
00024  int main() {
00025  
00026     pc.attach (&readSerial);             //Foreground: read the serial
00027     
00028  
00029    while (1){                            //Background: compare the serial value and user input.
00030     int i=1,j=0;
00031     while (serial[j]!='E') {             //Print the host value;
00032     pc.printf ("%c", serial[j]);
00033     j++;
00034     } 
00035     pc.printf ("E");
00036 
00037    while (1) {
00038         pc.printf (" The next input should be :");  //Hint
00039         pc.printf ("%c", serial[i]);
00040         if (serial[i]=='E'){
00041             pc.printf (" MATCH ");
00042             pc.printf ("\r\n");
00043             i=1;
00044             break;  
00045         }     
00046         else if (serial[i]==touchDetect()){                        
00047            i++;
00048            wait (0.5);
00049         }   
00050         else{ 
00051             pc.printf (" TOUCH ERROR ");
00052             pc.printf ("\r\n");               //If the user touch both sensor, the retun value is 3, which will lead to touch error.
00053             break;}                         //Also, if the user mistouch the sensor, it's also a touch error.
00054     }  
00055     }      
00056  }
00057  
00058  void readSerial()
00059  {
00060     char b;
00061     int flag=1,i=0;
00062     b=pc.getc();
00063     pc.printf("%c",b);
00064     if (b=='S'){
00065         serial[0]='S';
00066         i++;
00067         while (flag){
00068             serial[i]=pc.getc();  
00069             pc.printf ("%c",serial[i]);       
00070             if (serial[i]=='E'){
00071                 flag=0;} 
00072             else if (serial[i]=='S'){
00073                 pc.printf (" HOST ERROR \r\n ");    //Host sent two S before E. Host error.
00074                 break;} 
00075             i++;     
00076         }           
00077     }
00078 }
00079  
00080 char touchDetect ()        //Detect the user input
00081  {
00082     while (1) {
00083     if (touchSense1()){
00084            pc.printf (" T1 ");      //T1 means sensor1 is pressed
00085            if (touchSense2()){
00086                return '3';
00087            }
00088             while (touchSense1()){
00089                 wait(0.5);}
00090            return '1';
00091     }
00092     else if (touchSense2()){
00093            pc.printf (" T0 ");
00094            if (touchSense1()){
00095                 return '3';
00096            }
00097              while (touchSense2()){
00098                 wait(0.5);}
00099            return '0';
00100            
00101     }    
00102     wait (0.05); 
00103     }
00104   }
00105   
00106  int touchSense1(void)
00107  {
00108      float sample;
00109      ground1 = 0;
00110      charger1.mode(PullUp);
00111      charger1.mode(PullNone);
00112      sample=input1.read();
00113      if (sample < 0.3) {
00114          return 1;
00115      } else {
00116          return 0;
00117     }
00118  }
00119 
00120  int touchSense2(void)
00121  {
00122      float sample;
00123      ground2 = 0;
00124      charger2.mode(PullUp);
00125      charger2.mode(PullNone);
00126      sample=input2.read();
00127      if (sample < 0.3) {
00128          return 1;
00129      } else {
00130          return 0;
00131     }
00132  }