Nicholas Outram / Mbed OS Task622-mbedos54

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of Task622-mbedos54 by Stage-1 Students SoCEM

main.cpp@9:f9031b045b9a, 2017-04-03 (annotated)

Committer:
noutram
Date:
Mon Apr 03 11:53:02 2017 +0000
Revision:
9:f9031b045b9a
Parent:
8:c5663f5fa848 
updated for mbed os 5.4

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 9:f9031b045b9a 9 void thread1();
noutram 9:f9031b045b9a 10 void thread2();
noutram 8:c5663f5fa848 11 void switchISR();
noutram 0:f916cefba2f4 12
noutram 0:f916cefba2f4 13 //Digital outputs
noutram 0:f916cefba2f4 14 DigitalOut onBoardLED(LED1);
noutram 0:f916cefba2f4 15 DigitalOut redLED(D7);
noutram 0:f916cefba2f4 16 DigitalOut yellowLED(D6);
noutram 0:f916cefba2f4 17 DigitalOut greenLED(D5);
noutram 0:f916cefba2f4 18
noutram 2:70084af839d3 19 //Serial Interface
noutram 2:70084af839d3 20 Serial pc(USBTX, USBRX);
noutram 2:70084af839d3 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 8:c5663f5fa848 29 Thread *t2;
noutram 0:f916cefba2f4 30
noutram 0:f916cefba2f4 31 //Thread ID for the Main function (CMSIS API)
noutram 0:f916cefba2f4 32 osThreadId tidMain;
noutram 8:c5663f5fa848 33 osThreadId tid1;
noutram 8:c5663f5fa848 34 osThreadId tid2;
noutram 0:f916cefba2f4 35
noutram 8:c5663f5fa848 36
noutram 8:c5663f5fa848 37 //TBD: Call this on the falling edge of SW1
noutram 8:c5663f5fa848 38 void switchISR() {
noutram 8:c5663f5fa848 39 //TBD
noutram 8:c5663f5fa848 40 }
noutram 8:c5663f5fa848 41
noutram 8:c5663f5fa848 42 //High priority thread
noutram 9:f9031b045b9a 43 void thread1()
noutram 4:dae8898e55fe 44 {
noutram 8:c5663f5fa848 45 redLED = 1;
noutram 4:dae8898e55fe 46 while (true) {
noutram 8:c5663f5fa848 47
noutram 8:c5663f5fa848 48 // THIS IS BAD BAD BAD BAD BAD BAD
noutram 8:c5663f5fa848 49 // BLOCK ON FALLING EDGE OF SW1 BY RAPID POLLING (SPINNING)
noutram 8:c5663f5fa848 50 // Thread is blocked in the RUNNING state
noutram 8:c5663f5fa848 51 while (sw1 == 0);
noutram 8:c5663f5fa848 52 wait_ms(200); //Wait for debounce
noutram 8:c5663f5fa848 53 while (sw1 == 1);
noutram 8:c5663f5fa848 54 // TODO: FIX THIS! GET THE INTERRUPT TO SIGNAL THIS THREAD
noutram 8:c5663f5fa848 55
noutram 8:c5663f5fa848 56 redLED = !redLED;
noutram 8:c5663f5fa848 57 Thread::wait(1000); //Thread in WAITING state
noutram 8:c5663f5fa848 58 redLED = !redLED;
noutram 8:c5663f5fa848 59 Thread::wait(1000); //Thread in WAITING state
noutram 4:dae8898e55fe 60 }
noutram 2:70084af839d3 61 }
noutram 2:70084af839d3 62
noutram 8:c5663f5fa848 63 // This thread has normal priority
noutram 8:c5663f5fa848 64 // It is supposed to flash the green LED every second.
noutram 8:c5663f5fa848 65 // THIS IS NOT WORKING because it is currently being starved by thread1 (while polling the switch)
noutram 9:f9031b045b9a 66 void thread2()
noutram 0:f916cefba2f4 67 {
noutram 8:c5663f5fa848 68 greenLED = 1;
noutram 8:c5663f5fa848 69 while (true) {
noutram 8:c5663f5fa848 70 Thread::wait(500);
noutram 8:c5663f5fa848 71 greenLED = !greenLED;
noutram 6:2e463846b575 72 }
noutram 0:f916cefba2f4 73 }
noutram 0:f916cefba2f4 74
noutram 4:dae8898e55fe 75
noutram 8:c5663f5fa848 76 // Main thread
noutram 0:f916cefba2f4 77 int main() {
noutram 0:f916cefba2f4 78 redLED = 0;
noutram 0:f916cefba2f4 79 yellowLED = 0;
noutram 2:70084af839d3 80 greenLED = 0;
noutram 8:c5663f5fa848 81
noutram 9:f9031b045b9a 82 //Threads - created dynamically with new
noutram 9:f9031b045b9a 83 t1 = new Thread(osPriorityRealtime); //HIGH PRIORITY
noutram 9:f9031b045b9a 84 t2 = new Thread(osPriorityNormal);
noutram 9:f9031b045b9a 85
noutram 9:f9031b045b9a 86 //Note t1 and t2 are pointers (32 bit addresses), so the arrow -> is used
noutram 9:f9031b045b9a 87 t1->start(thread1);
noutram 9:f9031b045b9a 88 t2->start(thread2);
noutram 9:f9031b045b9a 89
noutram 8:c5663f5fa848 90 // Thread IDs
noutram 0:f916cefba2f4 91 tidMain = Thread::gettid();
noutram 8:c5663f5fa848 92 tid1 = t1->gettid();
noutram 8:c5663f5fa848 93 tid2 = t2->gettid();
noutram 7:cd015e83995a 94
noutram 8:c5663f5fa848 95 //TBD: Hook up interrupt
noutram 8:c5663f5fa848 96
noutram 4:dae8898e55fe 97 pc.printf("Main Thread\n");
noutram 2:70084af839d3 98 while (true) {
noutram 4:dae8898e55fe 99 Thread::wait(osWaitForever);
noutram 0:f916cefba2f4 100 }
noutram 0:f916cefba2f4 101 }
noutram 2:70084af839d3 102
noutram 2:70084af839d3 103