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
Revision 0:8179372e7aaa, committed 2009-12-21
- Comitter:
- hollie
- Date:
- Mon Dec 21 15:38:02 2009 +0000
- Commit message:
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
| mbed.bld | Show annotated file Show diff for this revision Revisions of this file |
diff -r 000000000000 -r 8179372e7aaa main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Dec 21 15:38:02 2009 +0000
@@ -0,0 +1,51 @@
+// 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
+//
+// Written by Lieven Hollevoet
+
+#include "mbed.h"
+
+// Create objects
+Serial pc(USBTX, USBRX);
+DigitalOut status(LED4);
+DigitalOut count(LED2);
+InterruptIn sensor(p5);
+
+int edgecount;
+
+void ISR_serial(void) {
+
+ char tmp = pc.getc();
+ status = 1;
+
+ pc.printf("Current edge count is %i\r\n", edgecount);
+ status = 0;
+}
+
+void falling_edge(void){
+ edgecount++;
+ count = 1;
+ pc.printf("Falling edge, count is %i!\r\n", edgecount);
+ count = 0;
+}
+
+int main() {
+
+ count = 0;
+ edgecount = 0;
+
+ pc.printf("Edgecounter started");
+
+ // Attach interrupt handlers
+ pc.attach(&ISR_serial);
+ sensor.fall(&falling_edge);
+
+}
+
diff -r 000000000000 -r 8179372e7aaa mbed.bld --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed.bld Mon Dec 21 15:38:02 2009 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/mbed_official/code/mbed/builds/49a220cc26e0