Lieven Hollevoet
/
EdgeCounter
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
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 |