David Furnival / Mbed OS Task633-mbedos-FZ429

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Dependencies:   ELEC350-Practicals-FZ429

Fork of Task633-mbedos-FZ429 by University of Plymouth - Stages 1, 2 and 3

main.cpp@9:31031bbb59c7, 2016-03-21 (annotated)

Committer:
noutram
Date:
Mon Mar 21 13:50:11 2016 +0000
Revision:
9:31031bbb59c7
Parent:
8:c5663f5fa848
Child:
10:3a3d2a571c8f
Task631 - simple message queue between an interrupt and a thread

Who changed what in which revision?

UserRevisionLine numberNew contents of line
noutram 0:f916cefba2f4 1 #include "mbed.h"
noutram 0:f916cefba2f4 2 #include "rtos.h"
noutram 2:70084af839d3 3 #include "string.h"
noutram 2:70084af839d3 4 #include <stdio.h>
noutram 2:70084af839d3 5 #include <ctype.h>
noutram 0:f916cefba2f4 6
noutram 8:c5663f5fa848 7 #define SWITCH1_RELEASE 1
noutram 8:c5663f5fa848 8
noutram 8:c5663f5fa848 9 void thread1( const void* );
noutram 8:c5663f5fa848 10 void thread2( const void* );
noutram 8:c5663f5fa848 11 void switchISR();
noutram 0:f916cefba2f4 12
noutram 9:31031bbb59c7 13 //Analogue inputs
noutram 9:31031bbb59c7 14 AnalogIn adcIn(A0);
noutram 9:31031bbb59c7 15
noutram 0:f916cefba2f4 16 //Digital outputs
noutram 0:f916cefba2f4 17 DigitalOut onBoardLED(LED1);
noutram 0:f916cefba2f4 18 DigitalOut redLED(D7);
noutram 0:f916cefba2f4 19 DigitalOut yellowLED(D6);
noutram 0:f916cefba2f4 20 DigitalOut greenLED(D5);
noutram 0:f916cefba2f4 21
noutram 0:f916cefba2f4 22 //Digital inputs
noutram 0:f916cefba2f4 23 DigitalIn onBoardSwitch(USER_BUTTON);
noutram 8:c5663f5fa848 24 DigitalIn sw1(D4); //CONSIDER CHANGING THIS TO AN INTERRUPT
noutram 8:c5663f5fa848 25 DigitalIn sw2(D3);
noutram 8:c5663f5fa848 26
noutram 8:c5663f5fa848 27 //Threads
noutram 8:c5663f5fa848 28 Thread *t1;
noutram 0:f916cefba2f4 29
noutram 9:31031bbb59c7 30 //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."
noutram 9:31031bbb59c7 31 Queue<uint32_t, 5> *queue;
noutram 0:f916cefba2f4 32
noutram 8:c5663f5fa848 33
noutram 9:31031bbb59c7 34 // Call this on precise intervals
noutram 9:31031bbb59c7 35 void adcISR() {
noutram 9:31031bbb59c7 36
noutram 9:31031bbb59c7 37 //Option to starve the queue
noutram 9:31031bbb59c7 38 if (sw2 == 1) return;
noutram 9:31031bbb59c7 39
noutram 9:31031bbb59c7 40 //Read sample - make a copy
noutram 9:31031bbb59c7 41 uint32_t sample = (uint32_t)(4095*adcIn.read());
noutram 9:31031bbb59c7 42
noutram 9:31031bbb59c7 43 //Write to queue
noutram 9:31031bbb59c7 44 osStatus stat = queue->put((uint32_t*)sample);
noutram 9:31031bbb59c7 45
noutram 9:31031bbb59c7 46 //Check if succesful
noutram 9:31031bbb59c7 47 if (stat == osErrorResource) {
noutram 9:31031bbb59c7 48 redLED = 1;
noutram 9:31031bbb59c7 49 printf("queue->put() Error code: %4Xh, Resource not available\r\n", stat);
noutram 9:31031bbb59c7 50 }
noutram 9:31031bbb59c7 51
noutram 8:c5663f5fa848 52 }
noutram 8:c5663f5fa848 53
noutram 9:31031bbb59c7 54 //Normal priority thread (consumer)
noutram 4:dae8898e55fe 55 void thread1( const void* arg )
noutram 9:31031bbb59c7 56 {
noutram 4:dae8898e55fe 57 while (true) {
noutram 9:31031bbb59c7 58 //Read queue - block (with timeout)
noutram 9:31031bbb59c7 59 osEvent evt = queue->get(5000); //With timeout
noutram 9:31031bbb59c7 60
noutram 9:31031bbb59c7 61 //Check status of get()
noutram 9:31031bbb59c7 62 switch (evt.status) {
noutram 9:31031bbb59c7 63 case osEventMessage:
noutram 9:31031bbb59c7 64 //Normal status
noutram 9:31031bbb59c7 65 printf("value = %d\n\r", evt.value.v);
noutram 9:31031bbb59c7 66 greenLED = !greenLED;
noutram 9:31031bbb59c7 67 break;
noutram 9:31031bbb59c7 68 case osEventTimeout:
noutram 9:31031bbb59c7 69 //Timeout
noutram 9:31031bbb59c7 70 printf("queue->get() returned %02x status (timeout)\n\r", evt.status);
noutram 9:31031bbb59c7 71 break;
noutram 9:31031bbb59c7 72 default:
noutram 9:31031bbb59c7 73 //All other errors (see cmsis_os.h for meaning of error code)
noutram 9:31031bbb59c7 74 printf("queue->get() returned %02x status\n\r", evt.status);
noutram 9:31031bbb59c7 75 break;
noutram 9:31031bbb59c7 76 }
noutram 9:31031bbb59c7 77
noutram 9:31031bbb59c7 78 //Block up consumer if switch is held down
noutram 9:31031bbb59c7 79 //Will fill the queue if held long enough
noutram 9:31031bbb59c7 80 while (sw1 == 1);
noutram 9:31031bbb59c7 81
noutram 9:31031bbb59c7 82 } //end while
noutram 0:f916cefba2f4 83 }
noutram 0:f916cefba2f4 84
noutram 4:dae8898e55fe 85
noutram 8:c5663f5fa848 86 // Main thread
noutram 0:f916cefba2f4 87 int main() {
noutram 0:f916cefba2f4 88 redLED = 0;
noutram 0:f916cefba2f4 89 yellowLED = 0;
noutram 2:70084af839d3 90 greenLED = 0;
noutram 8:c5663f5fa848 91
noutram 9:31031bbb59c7 92 //Start message
noutram 9:31031bbb59c7 93 printf("Welcome\n");
noutram 9:31031bbb59c7 94
noutram 9:31031bbb59c7 95 //Queue
noutram 9:31031bbb59c7 96 queue = new Queue<uint32_t,5>();
noutram 9:31031bbb59c7 97
noutram 9:31031bbb59c7 98 //Hook up timer interrupt
noutram 9:31031bbb59c7 99 Ticker timer;
noutram 9:31031bbb59c7 100 timer.attach(&adcISR, 1.0);
noutram 9:31031bbb59c7 101
noutram 8:c5663f5fa848 102 //Threads
noutram 9:31031bbb59c7 103 t1 = new Thread(&thread1);
noutram 7:cd015e83995a 104
noutram 9:31031bbb59c7 105 printf("Main Thread\n");
noutram 2:70084af839d3 106 while (true) {
noutram 9:31031bbb59c7 107 Thread::wait(5000);
noutram 9:31031bbb59c7 108 puts("Main Thread Alive");
noutram 0:f916cefba2f4 109 }
noutram 0:f916cefba2f4 110 }
noutram 2:70084af839d3 111
noutram 2:70084af839d3 112