Brandon Boesch / Mbed OS events_ex_1

Test

Fork of events_ex_1 by mbed_example

main.cpp@2:716e1b448b48, 2017-05-24 (annotated)

Committer:
brandonboesch
Date:
Wed May 24 14:49:41 2017 +0000
Revision:
2:716e1b448b48
Parent:
1:3ee1c217f3cb 
Now has a safer background thread that does not call printf

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mab5449 0:aea2e03f5625 1 #include "mbed.h"
mab5449 0:aea2e03f5625 2 #include "mbed_events.h"
mab5449 0:aea2e03f5625 3
mab5449 0:aea2e03f5625 4 DigitalOut led1(LED1);
mab5449 0:aea2e03f5625 5 InterruptIn sw(SW2);
mab5449 0:aea2e03f5625 6 EventQueue queue(32 * EVENTS_EVENT_SIZE);
mab5449 0:aea2e03f5625 7 Thread t;
mab5449 0:aea2e03f5625 8
brandonboesch 2:716e1b448b48 9 void rise_handler_user_context(void) {
brandonboesch 2:716e1b448b48 10 printf("rise_handler_user_context in context %p\r\n", Thread::gettid());
brandonboesch 2:716e1b448b48 11 }
brandonboesch 2:716e1b448b48 12
mab5449 0:aea2e03f5625 13 void rise_handler(void) {
brandonboesch 2:716e1b448b48 14 // Execute the time critical part first
mab5449 0:aea2e03f5625 15 led1 = !led1;
brandonboesch 2:716e1b448b48 16 // The rest can execute later in user context (and can contain code that's not interrupt safe).
brandonboesch 2:716e1b448b48 17 // We use the 'queue.call' function to add an event (the call to 'rise_handler_user_context') to the queue.
brandonboesch 2:716e1b448b48 18 queue.call(rise_handler_user_context);
mab5449 0:aea2e03f5625 19 }
mab5449 0:aea2e03f5625 20
mab5449 0:aea2e03f5625 21 void fall_handler(void) {
mab5449 0:aea2e03f5625 22 printf("fall_handler in context %p\r\n", Thread::gettid());
mab5449 0:aea2e03f5625 23 // Toggle LED
mab5449 0:aea2e03f5625 24 led1 = !led1;
mab5449 0:aea2e03f5625 25 }
mab5449 0:aea2e03f5625 26
mab5449 0:aea2e03f5625 27 int main() {
mab5449 0:aea2e03f5625 28 // Start the event queue
mab5449 0:aea2e03f5625 29 t.start(callback(&queue, &EventQueue::dispatch_forever));
mab5449 0:aea2e03f5625 30 printf("Starting in context %p\r\n", Thread::gettid());
mab5449 0:aea2e03f5625 31 // The 'rise' handler will execute in IRQ context
mab5449 0:aea2e03f5625 32 sw.rise(rise_handler);
mab5449 0:aea2e03f5625 33 // The 'fall' handler will execute in the context of thread 't'
mab5449 0:aea2e03f5625 34 sw.fall(queue.event(fall_handler));
mab5449 0:aea2e03f5625 35 }