Thomas Hamilton
Interface class for the Max Botix ultrasonic range finder model 1210. It includes input methods for PWM, Analog, and Serial. A PwmIn class was created to allow the PWM input to be read. Now includes automatic range update via interrupts.
Diff: PwmIn/PwmIn.cpp
- Revision:
- 0:3d969e0b4ca0
- Child:
- 2:997b4057c879
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/PwmIn/PwmIn.cpp Sun Aug 22 21:18:20 2010 +0000
@@ -0,0 +1,54 @@
+#include "PwmIn.h"
+
+PwmIn::PwmIn(PinName pwi) : InterruptIn(pwi), PeriodMeasurement(0), PulseWidthMeasurement(1)
+{
+ rise(this, &PwmIn::PulseStart);
+ fall(this, &PwmIn::PulseStop);
+ start();
+}
+
+float PwmIn::read()
+{
+ return (float)PulseWidthMeasurement / PeriodMeasurement;
+}
+
+float PwmIn::period()
+{
+ return (float)PeriodMeasurement / 1000000;
+}
+
+int PwmIn::period_ms()
+{
+ return PeriodMeasurement / 1000;
+}
+
+int PwmIn::period_us()
+{
+ return PeriodMeasurement;
+}
+
+float PwmIn::pulsewidth()
+{
+ return (float)PulseWidthMeasurement / 1000000;
+}
+
+int PwmIn::pulsewidth_ms()
+{
+ return PulseWidthMeasurement / 1000;
+}
+
+int PwmIn::pulsewidth_us()
+{
+ return PulseWidthMeasurement;
+}
+
+void PwmIn::PulseStart()
+{
+ PeriodMeasurement = read_us();
+ reset();
+}
+
+void PwmIn::PulseStop()
+{
+ PulseWidthMeasurement = read_us();
+}
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