main.cpp

00001 #include "mbed.h"
00002 #include "rtos.h"
00003 #include "string.h"
00004 #include <stdio.h>
00005 #include <ctype.h>
00006 
00007 #define DELAY 200
00008 
00009 //Digital outputs
00010 DigitalOut onBoardLED(LED1);
00011 DigitalOut redLED(D7);
00012 DigitalOut yellowLED(D6);
00013 DigitalOut greenLED(D5);
00014 
00015 //Serial Interface
00016 Serial pc(USBTX, USBRX);
00017 
00018 //Digital inputs
00019 DigitalIn  onBoardSwitch(USER_BUTTON);
00020 DigitalIn  SW1(D4);
00021 DigitalIn  SW2(D3);
00022 
00023 //Thread ID for the Main function (CMSIS API)
00024 osThreadId tidMain;
00025 
00026 //Thread sychronisation primatives
00027 Mutex lock1;
00028 Mutex lock2;
00029 unsigned long sw1Count = 0;
00030 unsigned long sw2Count = 0;
00031 
00032 void thread1() 
00033 {
00034     pc.printf("Entering thread 1\n");
00035     while (true) {
00036         yellowLED = 1;
00037         
00038         //Start critical section
00039         lock1.lock();
00040  
00041         sw1Count++;
00042         printf("\nCount1 = %lu", sw1Count);
00043         
00044         Thread::wait(1); //1ms
00045         
00046         //End critical section
00047         lock1.unlock();
00048                 
00049         if (SW1 == 1) {
00050             lock2.lock();
00051             sw2Count--;
00052             lock2.unlock();   
00053         }
00054         
00055         yellowLED = 0;
00056         Thread::wait(DELAY);       
00057     }
00058 }
00059 
00060 void thread2() 
00061 {
00062     pc.printf("Entering thread 2\n");  
00063     while (true) {
00064         redLED = 1;
00065         
00066         //Start critical section
00067         lock2.lock();
00068         
00069         sw2Count++;
00070         printf("\nCount2 = %lu", sw2Count);
00071         
00072         Thread::wait(1);  //1ms
00073         
00074         //End critical section
00075         lock2.unlock();
00076         
00077         if (SW2 == 1) { 
00078             lock1.lock();
00079             sw1Count--;
00080             lock1.unlock();  
00081         }  
00082 
00083         redLED = 0;
00084         Thread::wait(DELAY); 
00085         
00086     } 
00087 }
00088 
00089 
00090 //Main thread
00091 int main() {
00092     redLED    = 0;
00093     yellowLED = 0;
00094     greenLED  = 0;
00095                 
00096     //Main thread ID
00097     tidMain = Thread::gettid();  
00098     
00099     //Threads
00100     Thread t1, t2;
00101     
00102     t1.start(thread1);
00103     t2.start(thread2);
00104     
00105     pc.printf("Main Thread\n");
00106     while (true) {
00107         Thread::wait(osWaitForever);
00108     }
00109 
00110 }
00111 
00112