Lieven Hollevoet
EdgeCounter on mbed Counts falling edges on p5. Used as test setup for interfacing a hall sensor to our water/gas sensor. Whenever the hall sensor triggers, edgecount is incremented and the current value is transmitted to the serial port. Any character sent to the serial port returns the current count value
main.cpp@0:8179372e7aaa, 2009-12-21 (annotated)
- Committer:
- hollie
- Date:
- Mon Dec 21 15:38:02 2009 +0000
- Revision:
- 0:8179372e7aaa
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| hollie | 0:8179372e7aaa | 1 | // EdgeCounter on mbed |
| hollie | 0:8179372e7aaa | 2 | // |
| hollie | 0:8179372e7aaa | 3 | // Counts falling edges on p5. |
| hollie | 0:8179372e7aaa | 4 | // Used as test setup for interfacing a hall sensor to our water/gas sensor. |
| hollie | 0:8179372e7aaa | 5 | // |
| hollie | 0:8179372e7aaa | 6 | // Whenever the hall sensor triggers, edgecount is incremented and the |
| hollie | 0:8179372e7aaa | 7 | // current value is transmitted to the serial port. |
| hollie | 0:8179372e7aaa | 8 | // |
| hollie | 0:8179372e7aaa | 9 | // Any character sent to the serial port returns the current count value |
| hollie | 0:8179372e7aaa | 10 | // |
| hollie | 0:8179372e7aaa | 11 | // Written by Lieven Hollevoet |
| hollie | 0:8179372e7aaa | 12 | |
| hollie | 0:8179372e7aaa | 13 | #include "mbed.h" |
| hollie | 0:8179372e7aaa | 14 | |
| hollie | 0:8179372e7aaa | 15 | // Create objects |
| hollie | 0:8179372e7aaa | 16 | Serial pc(USBTX, USBRX); |
| hollie | 0:8179372e7aaa | 17 | DigitalOut status(LED4); |
| hollie | 0:8179372e7aaa | 18 | DigitalOut count(LED2); |
| hollie | 0:8179372e7aaa | 19 | InterruptIn sensor(p5); |
| hollie | 0:8179372e7aaa | 20 | |
| hollie | 0:8179372e7aaa | 21 | int edgecount; |
| hollie | 0:8179372e7aaa | 22 | |
| hollie | 0:8179372e7aaa | 23 | void ISR_serial(void) { |
| hollie | 0:8179372e7aaa | 24 | |
| hollie | 0:8179372e7aaa | 25 | char tmp = pc.getc(); |
| hollie | 0:8179372e7aaa | 26 | status = 1; |
| hollie | 0:8179372e7aaa | 27 | |
| hollie | 0:8179372e7aaa | 28 | pc.printf("Current edge count is %i\r\n", edgecount); |
| hollie | 0:8179372e7aaa | 29 | status = 0; |
| hollie | 0:8179372e7aaa | 30 | } |
| hollie | 0:8179372e7aaa | 31 | |
| hollie | 0:8179372e7aaa | 32 | void falling_edge(void){ |
| hollie | 0:8179372e7aaa | 33 | edgecount++; |
| hollie | 0:8179372e7aaa | 34 | count = 1; |
| hollie | 0:8179372e7aaa | 35 | pc.printf("Falling edge, count is %i!\r\n", edgecount); |
| hollie | 0:8179372e7aaa | 36 | count = 0; |
| hollie | 0:8179372e7aaa | 37 | } |
| hollie | 0:8179372e7aaa | 38 | |
| hollie | 0:8179372e7aaa | 39 | int main() { |
| hollie | 0:8179372e7aaa | 40 | |
| hollie | 0:8179372e7aaa | 41 | count = 0; |
| hollie | 0:8179372e7aaa | 42 | edgecount = 0; |
| hollie | 0:8179372e7aaa | 43 | |
| hollie | 0:8179372e7aaa | 44 | pc.printf("Edgecounter started"); |
| hollie | 0:8179372e7aaa | 45 | |
| hollie | 0:8179372e7aaa | 46 | // Attach interrupt handlers |
| hollie | 0:8179372e7aaa | 47 | pc.attach(&ISR_serial); |
| hollie | 0:8179372e7aaa | 48 | sensor.fall(&falling_edge); |
| hollie | 0:8179372e7aaa | 49 | |
| hollie | 0:8179372e7aaa | 50 | } |
| hollie | 0:8179372e7aaa | 51 |