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( const void* arg ) 
00033 {
00034     pc.printf("Entering thread 1\n");
00035     while (true) {
00036         
00037         //Start critical section
00038         lock1.lock();
00039  
00040         sw1Count++;
00041         printf("\nCount1 = %lu", sw1Count);
00042         
00043         //Thread::wait(1); //1ms
00044         
00045         if (SW1 == 1) {
00046             yellowLED = 1;
00047             lock2.lock();
00048             sw2Count--;
00049             lock2.unlock();  
00050             yellowLED = 0; 
00051         }
00052         
00053         //End critical section
00054         lock1.unlock();
00055         
00056         Thread::wait(DELAY);       
00057     }
00058 }
00059 
00060 void thread2( const void* arg ) 
00061 {
00062     pc.printf("Entering thread 2\n");  
00063     while (true) {
00064         
00065         //Start critical section
00066         lock2.lock();
00067         
00068         sw2Count++;
00069         printf("\nCount2 = %lu", sw2Count);
00070         
00071         //Thread::wait(1);  //1ms
00072         
00073         if (SW2 == 1) {
00074             redLED = 1; 
00075             lock1.lock();
00076             sw1Count--;
00077             lock1.unlock();  
00078             redLED = 0;
00079         }  
00080         //End critical section
00081         lock2.unlock();
00082         
00083         Thread::wait(DELAY); 
00084     } 
00085 }
00086 
00087 
00088 //Main thread
00089 int main() {
00090     redLED    = 0;
00091     yellowLED = 0;
00092     greenLED  = 0;
00093                 
00094     //Main thread ID
00095     tidMain = Thread::gettid();  
00096     
00097     //Threads
00098     Thread t1(thread1);
00099     Thread t2(thread2);
00100     
00101     pc.printf("Main Thread\n");
00102     while (true) {
00103         Thread::wait(osWaitForever);
00104     }
00105 
00106 }
00107 
00108