LAME
Dependencies: mbed 4DGL-uLCD-SE SDFileSystem PinDetect
main.cpp@1:768b8bd42e33, 2013-01-29 (annotated)
- Committer:
- 4180_1
- Date:
- Tue Jan 29 02:34:03 2013 +0000
- Revision:
- 1:768b8bd42e33
- Parent:
- 0:cc87c48aa43c
- Child:
- 2:58d85409f7ff
ver 1.0
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
4180_1 | 0:cc87c48aa43c | 1 | #include "mbed.h" |
4180_1 | 0:cc87c48aa43c | 2 | #include "PinDetect.h" |
4180_1 | 0:cc87c48aa43c | 3 | // must import Cookbook PinDetct library into project |
4180_1 | 0:cc87c48aa43c | 4 | // URL: http://mbed.org/users/AjK/libraries/PinDetect/lkyxpw |
4180_1 | 0:cc87c48aa43c | 5 | |
4180_1 | 0:cc87c48aa43c | 6 | DigitalOut myled(LED1); |
4180_1 | 0:cc87c48aa43c | 7 | DigitalOut myled2(LED2); |
4180_1 | 0:cc87c48aa43c | 8 | DigitalOut myled3(LED3); |
4180_1 | 0:cc87c48aa43c | 9 | DigitalOut myled4(LED4); |
4180_1 | 0:cc87c48aa43c | 10 | |
4180_1 | 1:768b8bd42e33 | 11 | PinDetect pb1(p8); |
4180_1 | 1:768b8bd42e33 | 12 | PinDetect pb2(p7); |
4180_1 | 0:cc87c48aa43c | 13 | // SPST Pushbutton debounced count demo using interrupts and callback |
4180_1 | 0:cc87c48aa43c | 14 | // no external PullUp resistor needed |
4180_1 | 0:cc87c48aa43c | 15 | // Pushbutton from P8 to GND. |
4180_1 | 1:768b8bd42e33 | 16 | // Second Pushbutton from P7 to GND. |
4180_1 | 0:cc87c48aa43c | 17 | // A pb hit generates an interrupt and activates the callback function |
4180_1 | 0:cc87c48aa43c | 18 | // after the switch is debounced |
4180_1 | 0:cc87c48aa43c | 19 | |
4180_1 | 0:cc87c48aa43c | 20 | // Global count variable |
4180_1 | 0:cc87c48aa43c | 21 | int volatile count=0; |
4180_1 | 0:cc87c48aa43c | 22 | |
4180_1 | 1:768b8bd42e33 | 23 | // Callback routine is interrupt activated by a debounced pb1 hit |
4180_1 | 1:768b8bd42e33 | 24 | void pb1_hit_callback (void) { |
4180_1 | 0:cc87c48aa43c | 25 | count++; |
4180_1 | 0:cc87c48aa43c | 26 | myled4 = count & 0x01; |
4180_1 | 0:cc87c48aa43c | 27 | myled3 = (count & 0x02)>>1; |
4180_1 | 0:cc87c48aa43c | 28 | myled2 = (count & 0x04)>>2; |
4180_1 | 0:cc87c48aa43c | 29 | } |
4180_1 | 1:768b8bd42e33 | 30 | // Callback routine is interrupt activated by a debounced pb2 hit |
4180_1 | 1:768b8bd42e33 | 31 | void pb2_hit_callback (void) { |
4180_1 | 1:768b8bd42e33 | 32 | count--; |
4180_1 | 1:768b8bd42e33 | 33 | myled4 = count & 0x01; |
4180_1 | 1:768b8bd42e33 | 34 | myled3 = (count & 0x02)>>1; |
4180_1 | 1:768b8bd42e33 | 35 | myled2 = (count & 0x04)>>2; |
4180_1 | 1:768b8bd42e33 | 36 | } |
4180_1 | 0:cc87c48aa43c | 37 | int main() { |
4180_1 | 0:cc87c48aa43c | 38 | |
4180_1 | 1:768b8bd42e33 | 39 | // Use internal pullups for pushbutton |
4180_1 | 1:768b8bd42e33 | 40 | pb1.mode(PullUp); |
4180_1 | 1:768b8bd42e33 | 41 | pb2.mode(PullUp); |
4180_1 | 0:cc87c48aa43c | 42 | // Delay for initial pullup to take effect |
4180_1 | 0:cc87c48aa43c | 43 | wait(.01); |
4180_1 | 1:768b8bd42e33 | 44 | // Setup Interrupt callback functions for a pb hit |
4180_1 | 1:768b8bd42e33 | 45 | pb1.attach_deasserted(&pb1_hit_callback); |
4180_1 | 1:768b8bd42e33 | 46 | pb2.attach_deasserted(&pb2_hit_callback); |
4180_1 | 1:768b8bd42e33 | 47 | // Start sampling pb inputs using interrupts |
4180_1 | 1:768b8bd42e33 | 48 | pb1.setSampleFrequency(); |
4180_1 | 1:768b8bd42e33 | 49 | pb2.setSampleFrequency(); |
4180_1 | 0:cc87c48aa43c | 50 | //Blink myled in main routine forever while responding to pb changes |
4180_1 | 0:cc87c48aa43c | 51 | // via interrupts that activate the callback counter function |
4180_1 | 0:cc87c48aa43c | 52 | while (1) { |
4180_1 | 0:cc87c48aa43c | 53 | myled = !myled; |
4180_1 | 0:cc87c48aa43c | 54 | wait(.5); |
4180_1 | 0:cc87c48aa43c | 55 | } |
4180_1 | 0:cc87c48aa43c | 56 | |
4180_1 | 0:cc87c48aa43c | 57 | } |