Measure the width (time-wise) of an incoming pulse.
Dependencies: dispBoB mbed PCA9635
counter.cpp
- Committer:
- d_worrall
- Date:
- 2011-07-11
- Revision:
- 0:dd684fb95312
- Child:
- 1:f04131cae8b8
File content as of revision 0:dd684fb95312:
#include "mbed.h" #include "dispBoB.h" dispBoB db(p28, p27, p26); //instantiate a dispBoB object InterruptIn trigger(p12); //set up the trigger as an external interrupt Timer t; void up(){ //function to call upon interrupt t.start(); } void down(){ t.stop(); db.locate(0); db.printf("%06d", t.read_ms()); //print counter info to dispBoB t.reset(); t.start(); } int main() { trigger.mode(PullUp); //activate internal pull up (hardware specific) db.init(); db.cls(); //clear screen trigger.rise(&up); //attach count() to interrupt on rising edge of trigger trigger.fall(&down); db.printf("%06d", t.read_ms()); //display an inital count "000000" }