syouichi imamori
positive or negative pulse width counter
Diff: PulseWidthCounter.cpp
- Revision:
- 1:d37d6388c179
- Parent:
- 0:89bd4ad6027d
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PulseWidthCounter.cpp Thu Jul 11 19:15:42 2013 +0000
@@ -0,0 +1,27 @@
+#include "mbed.h"
+#include "InterruptIn.h"
+#include "PulseWidthCounter.h"
+
+PulseWidthCounter::PulseWidthCounter(PinName _interrupt,bool positive=true) : interrupt(_interrupt) //constructa
+{
+ if ( positive )
+ { interrupt.rise(this,&PulseWidthCounter::start);
+ interrupt.fall(this,&PulseWidthCounter::stop);
+ }
+ else
+ { interrupt.fall(this,&PulseWidthCounter::start);
+ interrupt.rise(this,&PulseWidthCounter::stop);
+ }
+}
+
+void PulseWidthCounter::start()
+{
+ _time.reset();
+ _time.start();
+}
+
+void PulseWidthCounter::stop()
+{
+ _time.stop();
+ count = _time.read_us();
+}