Leonardo Iandiorio / Mbed OS BlinkButton2Sec

In class exercise

main.cpp@0:03a01dc34973, 2018-11-16 (annotated)

Committer:
iandil
Date:
Fri Nov 16 13:45:52 2018 +0000
Revision:
0:03a01dc34973
Child:
1:bc20d07886cc
put everything inside thread context;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
iandil 0:03a01dc34973 1 #include "mbed.h"
iandil 0:03a01dc34973 2
iandil 0:03a01dc34973 3 DigitalOut led3(LED3);
iandil 0:03a01dc34973 4 InterruptIn button(USER_BUTTON);
iandil 0:03a01dc34973 5 EventQueue queue(32 * EVENTS_EVENT_SIZE);
iandil 0:03a01dc34973 6 Thread t;
iandil 0:03a01dc34973 7 int counter = 0;
iandil 0:03a01dc34973 8 volatile time_t seconds_now;
iandil 0:03a01dc34973 9
iandil 0:03a01dc34973 10 void rise_handler_thread_context(void) {
iandil 0:03a01dc34973 11 counter++;
iandil 0:03a01dc34973 12 if((time(NULL) - seconds_now) < 2000) {
iandil 0:03a01dc34973 13 if(counter == 2) {
iandil 0:03a01dc34973 14 led3 = !led3;
iandil 0:03a01dc34973 15 wait(0.8);
iandil 0:03a01dc34973 16 led3 = !led3;
iandil 0:03a01dc34973 17 counter = 0;
iandil 0:03a01dc34973 18 seconds_now = time(NULL);
iandil 0:03a01dc34973 19 }
iandil 0:03a01dc34973 20 } else {
iandil 0:03a01dc34973 21 seconds_now = time(NULL);
iandil 0:03a01dc34973 22 counter = 0;
iandil 0:03a01dc34973 23 }
iandil 0:03a01dc34973 24 }
iandil 0:03a01dc34973 25
iandil 0:03a01dc34973 26 void rise_handler_iterrupt_context(void) {
iandil 0:03a01dc34973 27 // Execute the time critical part first
iandil 0:03a01dc34973 28 // The rest can execute later in user context (and can contain code that's not interrupt safe)
iandil 0:03a01dc34973 29 // We use the 'queue.call' function to add an event (the call to 'rise_handler_user_context') to the queue
iandil 0:03a01dc34973 30 queue.call(rise_handler_thread_context);
iandil 0:03a01dc34973 31 }
iandil 0:03a01dc34973 32
iandil 0:03a01dc34973 33 void fall_handler(void) {
iandil 0:03a01dc34973 34 printf("Output a String\n");
iandil 0:03a01dc34973 35 }
iandil 0:03a01dc34973 36
iandil 0:03a01dc34973 37 int main() {
iandil 0:03a01dc34973 38 // Start the event queue
iandil 0:03a01dc34973 39 t.start(callback(&queue, &EventQueue::dispatch_forever));
iandil 0:03a01dc34973 40 printf("Starting in context %p\r\n", Thread::gettid());
iandil 0:03a01dc34973 41 // The 'rise' handler will execute in IRQ context
iandil 0:03a01dc34973 42 seconds_now = time(NULL);
iandil 0:03a01dc34973 43 button.rise(rise_handler_iterrupt_context);
iandil 0:03a01dc34973 44 // The 'fall' handler will execute in the context of thread 't'
iandil 0:03a01dc34973 45 button.fall(queue.event(fall_handler));
iandil 0:03a01dc34973 46 }