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DebouncedIn.cpp
- Committer:
- tony63
- Date:
- 2015-04-14
- Revision:
- 0:4676a90107ca
File content as of revision 0:4676a90107ca:
#include "DebouncedIn.h" #include "mbed.h" /* * Constructor */ DebouncedIn::DebouncedIn(PinName in) : _in(in) { // reset all the flags and counters _samples = 0; _output = 0; _output_last = 0; _rising_flag = 0; _falling_flag = 0; _state_counter = 0; // Attach ticker _ticker.attach(this, &DebouncedIn::_sample, 0.005); } void DebouncedIn::_sample() { // take a sample _samples = _samples >> 1; // shift left if (_in) { _samples |= 0x80; } // examine the sample window, look for steady state if (_samples == 0x00) { _output = 0; } else if (_samples == 0xFF) { _output = 1; } // Rising edge detection if ((_output == 1) && (_output_last == 0)) { _rising_flag++; _state_counter = 0; } // Falling edge detection else if ((_output == 0) && (_output_last == 1)) { _falling_flag++; _state_counter = 0; } // steady state else { _state_counter++; } // update the output _output_last = _output; } // return number of rising edges int DebouncedIn::rising(void) { int return_value = _rising_flag; _rising_flag = 0; return(return_value); } // return number of falling edges int DebouncedIn::falling(void) { int return_value = _falling_flag; _falling_flag = 0; return(return_value); } // return number of ticsk we've bene steady for int DebouncedIn::steady(void) { return(_state_counter); } // return the debounced status int DebouncedIn::read(void) { return(_output); } // shorthand for read() DebouncedIn::operator int() { return read(); }