main.cpp

00001 #include "mbed.h"
00002 #include "sample_hardware.hpp"
00003 
00004 #include "string.h"
00005 #include <stdio.h>
00006 #include <ctype.h>
00007 
00008 #define SWITCH1_RELEASE 1
00009 
00010 void thread1();
00011 void thread2();
00012 void switchISR();
00013 
00014 //Threads
00015 Thread t1;
00016 
00017 //Queues - "A message can be a integer or pointer value  to a certain type T that is sent to a thread or interrupt service routine."
00018 Queue<uint32_t, 5> queue;
00019 
00020 // Call this on precise intervals
00021 void adcISR() {
00022     
00023     //Option to starve the queue
00024     if (SW2 == 1) return;
00025     
00026     //Read sample - make a copy
00027     uint32_t sample = (uint32_t)(4095*adcIn.read());
00028     
00029     //Write to queue
00030     osStatus stat = queue.put((uint32_t*)sample);
00031     
00032     //Check if succesful
00033     if (stat == osErrorResource) {
00034         redLED = 1; 
00035         printf("queue->put() Error code: %4Xh, Resource not available\r\n", stat);   
00036     }
00037     
00038 }
00039 
00040 //Normal priority thread (consumer)
00041 void thread1() 
00042 {    
00043     while (true) {
00044         //Read queue - block (with timeout)
00045         osEvent evt = queue.get(5000);     //With timeout
00046         
00047         //Check status of get()
00048         switch (evt.status) { 
00049             case osEventMessage:
00050                 //Normal status
00051                 printf("value = %d\n\r", evt.value.v);
00052                 greenLED = !greenLED;
00053                 break;
00054             case osEventTimeout:
00055                 //Timeout
00056                 printf("queue.get() returned %02x status (timeout)\n\r", evt.status);
00057                 break;
00058             default:
00059                 //All other errors (see cmsis_os.h for meaning of error code)
00060                 printf("queue.get() returned %02x status\n\r", evt.status);
00061                 break;
00062         }
00063                 
00064         //Block up consumer if switch is held down
00065         //Will fill the queue if held long enough
00066         while (SW1 == 1);
00067         
00068     } //end while
00069 }
00070 
00071 
00072 // Main thread
00073 int main() {
00074     post();
00075            
00076     //Start message
00077     printf("Welcome\n");
00078            
00079     //Hook up timer interrupt   
00080     Ticker timer; 
00081     timer.attach(&adcISR, 1.0);
00082                
00083     //Threads
00084     t1.start(thread1);
00085     
00086     printf("Main Thread\n");
00087     while (true) {
00088         Thread::wait(5000);
00089         puts("Main Thread Alive");
00090     }
00091 }
00092 
00093