Library for setting up the Parallax X-Band Motion Detector.
Dependents: Parallax_XBAND_Demo Motion_Detection_Parallax
Diff: Parallax_X-Band.h
- Revision:
- 2:6e294a3a74f8
- Parent:
- 1:860badad8be9
- Child:
- 3:b9e54783e0c5
diff -r 860badad8be9 -r 6e294a3a74f8 Parallax_X-Band.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Parallax_X-Band.h Sun Mar 08 20:01:37 2015 +0000 @@ -0,0 +1,87 @@ +#include "mbed.h" + +/** + * Wrapper for the Parallax X-Band Motion Detector + */ +class xband +{ +public: + + /** + * Initialize the xband motion detector and setup interrupts on specified pins. + * Default is to be disabled. + * + * @param pin_enable Enable pin. Connected to EN on xband. + * @param pin_input Data pin. Connected to OUT on xband. + */ + xband(PinName pin_enable, PinName pin_input); + + /** + * Destructor + */ + ~xband(); + + /** + * Subroutine to enable and disable the detector. + * + * @param enable True to enable, False to disable. + */ + void enable(bool enable); + + /** + * Get count value and return it as an integer. + * + * @return Integer value of current count. + */ + int read_count(); + + /** + * Resets the count variable to 0. + */ + void reset_count(); + + /** + * Checks if a new velocity value has been calculated. + * + * @return True if a new velocity value is avaliable. False if the value has + * already been read. + */ + bool velocityack(); + + /** + * Get current velocity reading. Sets a flag to false to indicate a stale value after reading. + * + * @return Float value of currently measured velocity. + */ + float read_velocity(); + +private: + /** + * Interrupt service routine to collect data on the input pin. + */ + void xband_RiseISR(); + + /** + * Interrupt service routine to calculate the velocity of the moving object. + */ + void xband_velocityISR(); + + // Setup pin input types. + DigitalOut _pin_enable; + InterruptIn _pin_input; + + // Stores count value. + volatile int _count; + // Old count value. + volatile int _lastcount; + // Store calculated velocity. + float _velocity; + // Velocity read status flag. + bool _velocityflag; + + // Timer for differentiation + Timer _sampletime; + + // Interrupt to calculate velocity. + Ticker _samplevelocity; +}; \ No newline at end of file