Andrea Vicari
Create an Mbed program that - Outputs a string every time the button is pressed - Blinks LED1 if the button is pressed twice within two seconds - Use time_t seconds = time(NULL) to get current time
Diff: main.cpp
- Revision:
- 0:9758d6dc0132
- Child:
- 1:916c0b2b9f1c
diff -r 000000000000 -r 9758d6dc0132 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Thu Nov 29 17:05:46 2018 +0000
@@ -0,0 +1,47 @@
+#include "mbed.h"
+
+DigitalOut led1(LED1);
+InterruptIn button(USER_BUTTON);
+EventQueue queue(32 * EVENTS_EVENT_SIZE);
+Thread t;
+time_t pressed_seconds = time(NULL);
+
+void blink_led(){
+ led1 = !led1;
+ wait(0.5);
+ led1 = !led1;
+ wait(0.5);
+ led1 = !led1;
+ wait(0.5);
+ led1 = !led1;
+}
+void rise_handler_thread_context(void) {
+// printf("rise_handler_thread_context in context %p\r\n", Thread::gettid());
+ if(pressed_seconds - time(NULL) > 2){
+ pressed_seconds = time(NULL);
+ } else {
+ blink_led();
+ pressed_seconds = time(NULL);
+ }
+}
+
+void rise_handler_iterrupt_context(void) {
+ // Execute the time critical part first
+ // The rest can execute later in user context (and can contain code that's not interrupt safe)
+ // We use the 'queue.call' function to add an event (the call to 'rise_handler_user_context') to the queue
+ queue.call(rise_handler_thread_context);
+}
+
+void fall_handler(void) {
+ printf("I am a string\n");
+}
+
+int main() {
+ // Start the event queue
+ t.start(callback(&queue, &EventQueue::dispatch_forever));
+ printf("Starting in context %p\r\n", Thread::gettid());
+ // The 'rise' handler will execute in IRQ context
+ button.rise(rise_handler_iterrupt_context);
+ // The 'fall' handler will execute in the context of thread 't'
+ button.fall(queue.event(fall_handler));
+}