![](/media/cache/profiles/bd1ce36d68a5c2bea97fe45863673b20.jpg.50x50_q85.jpg)
programa para probar recepcion de cadenas por parte de APP INVENTOR, tres suiches en modo toggle controlan encendido y apagado de tres colores
Diff: DebouncedIn.cpp
- Revision:
- 0:4676a90107ca
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DebouncedIn.cpp Tue Apr 14 02:05:54 2015 +0000 @@ -0,0 +1,93 @@ +#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(); +} + +