joshema 216 / Mbed 2 deprecated TAREA_4_GPS_GSM

Procesadores, 2016 - II. Tarea #4. Oswaldo Andrés Giraldo Giraldo, Héctor Andrés Hoyos Ceballos, Jose Fernando Montoya Vargas, María Fernanda Villa Tamayo. Programa para establecer la comunicación con el módem Siemens A56, la lectura de coordenadas de GPS que son transmitidas en una UART por medio de un Dongle USB y la conversión de datos en formato ASCII a PDU.

Dependencies:   GPS_G mbed

Fork of TareaGPS_Siemens by Gustavo Ramirez

DebouncedIn.cpp

Committer:
joshema216
Date:
2016-11-18
Revision:
2:ea6275d1222f
Parent:
0:b2a6aa7c0c8c

File content as of revision 2:ea6275d1222f:

#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();
}