Peiling Yi
/
digitalInInterrupt_modify
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Fork of
digitalInInterrupt_sample
by 
William Marsh
main.cpp@3:05b6a1431a6b, 2018-01-16 (annotated)
- Committer:
- WilliamMarshQMUL
- Date:
- Tue Jan 16 18:14:21 2018 +0000
- Revision:
- 3:05b6a1431a6b
- Parent:
- 2:071f22412cdc
- Child:
- 4:f140d7032fea
Convert to mbed 5
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| WilliamMarshQMUL | 0:a66a8cb0012c | 1 | #include "mbed.h" |
| WilliamMarshQMUL | 0:a66a8cb0012c | 2 | |
| WilliamMarshQMUL | 1:13e0c1956b54 | 3 | // Labs 2: Example program for using an interrupt (or callback) |
| WilliamMarshQMUL | 1:13e0c1956b54 | 4 | // ----------------------------------------------------------- |
| WilliamMarshQMUL | 1:13e0c1956b54 | 5 | // A callback function (corresponding to an ISR) is called when a button |
| WilliamMarshQMUL | 1:13e0c1956b54 | 6 | // is pressed |
| WilliamMarshQMUL | 1:13e0c1956b54 | 7 | // The callback uses a shared variable to signal another thread |
| WilliamMarshQMUL | 0:a66a8cb0012c | 8 | |
| WilliamMarshQMUL | 1:13e0c1956b54 | 9 | InterruptIn button(PTD0); |
| WilliamMarshQMUL | 3:05b6a1431a6b | 10 | DigitalOut led(LED_GREEN); |
| WilliamMarshQMUL | 0:a66a8cb0012c | 11 | |
| WilliamMarshQMUL | 1:13e0c1956b54 | 12 | volatile int pressEvent = 0 ; |
| WilliamMarshQMUL | 0:a66a8cb0012c | 13 | |
| WilliamMarshQMUL | 3:05b6a1431a6b | 14 | // This function is invoked when then interrupt occurs |
| WilliamMarshQMUL | 3:05b6a1431a6b | 15 | // Signal that the button has been pressed |
| WilliamMarshQMUL | 1:13e0c1956b54 | 16 | // Note: bounce may occur |
| WilliamMarshQMUL | 1:13e0c1956b54 | 17 | void buttonCallback(){ |
| WilliamMarshQMUL | 1:13e0c1956b54 | 18 | pressEvent = 1 ; |
| WilliamMarshQMUL | 0:a66a8cb0012c | 19 | } |
| WilliamMarshQMUL | 0:a66a8cb0012c | 20 | |
| WilliamMarshQMUL | 3:05b6a1431a6b | 21 | /* ---- Main function (default thread) ---- |
| WilliamMarshQMUL | 3:05b6a1431a6b | 22 | Note that if this thread completes, nothing else works |
| WilliamMarshQMUL | 3:05b6a1431a6b | 23 | */ |
| WilliamMarshQMUL | 3:05b6a1431a6b | 24 | int main() { |
| WilliamMarshQMUL | 3:05b6a1431a6b | 25 | button.mode(PullUp); // Ensure button i/p has pull up |
| WilliamMarshQMUL | 3:05b6a1431a6b | 26 | button.fall(&buttonCallback) ; // Attach function to falling edge |
| WilliamMarshQMUL | 3:05b6a1431a6b | 27 | |
| WilliamMarshQMUL | 0:a66a8cb0012c | 28 | while(true) { |
| WilliamMarshQMUL | 3:05b6a1431a6b | 29 | // Toggle the LED every time the button is pressed |
| WilliamMarshQMUL | 0:a66a8cb0012c | 30 | if (pressEvent) { |
| WilliamMarshQMUL | 0:a66a8cb0012c | 31 | led = !led ; |
| WilliamMarshQMUL | 1:13e0c1956b54 | 32 | pressEvent = 0 ; // Clear the event variable |
| WilliamMarshQMUL | 0:a66a8cb0012c | 33 | } |
| WilliamMarshQMUL | 0:a66a8cb0012c | 34 | Thread::wait(100) ; |
| WilliamMarshQMUL | 0:a66a8cb0012c | 35 | } |
| WilliamMarshQMUL | 0:a66a8cb0012c | 36 | } |