main.cpp

00001 #include "mbed.h"
00002 #include "rtos.h"
00003 
00004 #define RED_DONE 1
00005 #define YELLOW_DONE 2
00006 
00007 
00008 //Function declarations
00009 void countUP(void const *args);
00010 void countDOWN(void const *args);
00011 
00012 //Digital outputs
00013 DigitalOut onBoardLED(LED1);
00014 DigitalOut redLED(D7);
00015 DigitalOut yellowLED(D6);
00016 DigitalOut greenLED(D5);
00017 
00018 //Digital inputs
00019 DigitalIn  onBoardSwitch(USER_BUTTON);
00020 DigitalIn  SW1(D4);
00021 DigitalIn  SW2(D3);
00022 
00023 //Thread object references
00024 Thread* t1;
00025 Thread* t2;
00026 
00027 //Thread ID for the Main function (CMSIS API)
00028 osThreadId tidMain;
00029 
00030 //Stared mutable state
00031 volatile long long count = 0;
00032 
00033 //Threads
00034 void countUP(void const *args)
00035 {
00036     redLED = 1;
00037     
00038     for (unsigned int n=0; n<10000; n++) {
00039         count++;
00040         count++;        
00041         count++;
00042         count++;    
00043         count++;
00044         count++; 
00045         count++;
00046         count++;
00047         count++;
00048         count++;   
00049     }
00050     
00051     redLED = 0;
00052     osSignalSet(tidMain, RED_DONE);  //Signal main thread we are done
00053 }
00054 
00055 void countDOWN(void const *args)
00056 {
00057     yellowLED = 1;
00058     
00059     for (unsigned int n=0; n<10000; n++) {
00060         count--;
00061         count--;        
00062         count--;
00063         count--;    
00064         count--;
00065         count--; 
00066         count--;
00067         count--;
00068         count--;
00069         count--;               
00070     }   
00071     
00072     osSignalSet(tidMain, YELLOW_DONE); //Signal main thread we are done
00073     yellowLED = 0;
00074 }
00075 
00076 
00077 //Main thread
00078 int main() {
00079     redLED    = 0;
00080     yellowLED = 0;
00081     greenLED  = 1;
00082     
00083     //Main thread ID
00084     tidMain = Thread::gettid();  
00085     
00086     //Press the switch to run concurrently
00087     if (onBoardSwitch == 1) {
00088         printf("Running sequntially\n");
00089         countUP(NULL);
00090         countDOWN(NULL);        
00091     } else {
00092         printf("Running concurrently\n");
00093         Thread t1(countUP);           
00094         Thread t2(countDOWN);    
00095   
00096         //Wait for the ALL_ON signal
00097         Thread::signal_wait(RED_DONE,osWaitForever);
00098         Thread::signal_wait(YELLOW_DONE,osWaitForever);        
00099     }
00100 
00101     printf("Final result = %lld\n", count);
00102     if (count == 0) {
00103         greenLED = 0;
00104     }
00105     while(true);
00106 }