main.cpp

00001 #include "mbed.h"
00002 #include "TSISensor.h"
00003 //  program for lab 5
00004 // -------------------------
00005 // Implement the functions of four virtual buttons
00006 
00007 Serial pc(USBTX, USBRX);   // tx, rx
00008 DigitalOut yellowLED(D6);     // yellow led port
00009 DigitalOut greenLED(D7);      // green led port
00010 DigitalOut redLED(D8);         // red led port
00011 DigitalOut blueLED(D9);        //blue led port
00012 
00013 
00014 TSISensor tsi;
00015 
00016 Thread redThread ; // thread for red LED
00017 Thread greenThread ; // thread for green LED
00018 Thread blueThread; // thread for blue LED
00019 Thread yellowThread; //thread for yellow LED
00020 # define REDFLAG 0x01   
00021 # define GREENFLAG 0x02
00022 # define BLUEFLAG 0x04
00023 # define YELLOWFLAG 0x08
00024 
00025 EventFlags signals;  // eventflag signal, uesd for comunicate 
00026 enum pos {none, leftIn, leftOut, rightIn, rightOut}; // 5 states for the buttons
00027 
00028 void red_thread() {  // thread for red LED
00029     while (true) {
00030         signals.wait_any(REDFLAG);
00031         redLED = !redLED ; //  on&off
00032         ThisThread::sleep_for(1000) ; // delay
00033         signals.clear(REDFLAG) ;        // clear the signal flag for futher use
00034     }
00035 }
00036 
00037 void green_thread() {  // thread for green LED
00038     while (true) {
00039         signals.wait_any(GREENFLAG);
00040         greenLED = !greenLED ; //  on&off
00041         ThisThread::sleep_for(1000) ; // delay
00042         signals.clear(GREENFLAG) ;        // clear the signal flag for futher use
00043     }
00044 }
00045 
00046 void blue_thread() {  // thread for blue LED
00047     while (true) {
00048         signals.wait_any(BLUEFLAG);
00049         blueLED = !blueLED ; //  on&off
00050         ThisThread::sleep_for(1000) ; // delay
00051         signals.clear(BLUEFLAG) ;        // clear the signal flag for futher use
00052     }
00053 }
00054 
00055 void yellow_thread()    // thread for yellow LED
00056 {
00057     while (true) {
00058         signals.wait_any(YELLOWFLAG);
00059         yellowLED = !yellowLED ; //  on&off
00060         ThisThread::sleep_for(1000) ; // delay
00061         signals.clear(YELLOWFLAG) ;        // clear the signal flag for futher use
00062     }
00063 }
00064 
00065 int main(void) {
00066     redLED = 0 ; 
00067     greenLED = 0 ; 
00068     blueLED = 0; 
00069     yellowLED = 0;  // beginning state for the four LEDs
00070     int pos = none; // initialise state
00071     redThread.start(red_thread) ; //  red LED thread
00072     greenThread.start(green_thread) ; //  green LED thread
00073     blueThread.start(blue_thread);//  blue LED thread
00074     yellowThread.start(yellow_thread);// yellow LED thread
00075     
00076     while (true) {
00077         uint8_t d = tsi.readDistance() ;  // read the variables form the touchpad
00078         switch (pos){ 
00079         
00080             case none: // none state
00081                 if (d > 3 && d < 9) 
00082                 {signals.set(YELLOWFLAG);pos = leftOut;}
00083                  // if in range inside 3 - 9, left out button
00084  
00085                 if (d > 13 && d < 19) 
00086                 {signals.set(BLUEFLAG);pos = leftIn;}
00087                 // if in range inside 13 - 19, leftin button
00088 
00089                 if (d > 23 && d < 29) 
00090                 {signals.set(GREENFLAG);pos = rightIn;}
00091                 // if in range inside 23 - 29, right in button
00092 
00093                 if (d > 33) 
00094                 {signals.set(REDFLAG);pos = rightOut;}
00095                 // if in range d bigger 33 ,right out button
00096                 break;
00097                 
00098             case leftIn: 
00099                 if(d < 13 || d > 19) 
00100                 pos = none; // if out of the range, state goes back to none
00101                 break;
00102                 
00103             case leftOut:
00104                 if(d < 3 || d > 9) 
00105                 pos = none;// if out of the range, state goes back to none
00106                 break;
00107             case rightIn:
00108             // case right in
00109                 if(d < 23 || d > 29) 
00110                 pos = none;// if  out of the range, state goes back to none
00111                 break;
00112             case rightOut:// case right out
00113                 if(d < 33) 
00114                 pos = none;// if  out of the range, state goes back to none
00115                 break;
00116         }
00117 
00118         pc.printf("%d", d) ;  
00119         pc.printf("%d", pos) ;  
00120         pc.putc(' ') ;
00121         ThisThread::sleep_for(1000) ;
00122  
00123     }
00124 }