debounce_button.h

00001 #include "mbed.h"
00002 
00003 /**
00004     Due to the imperfect design of the buttons, a press on the button is registered multple times.
00005     The debouncer module makes sure that these false positives of the button are going to be ignored.
00006     
00007     Also, this module provides a multiclick service which allows the user to press the button multiple times 
00008     within a certain time frame. Therefore, multiple actions can be mapped to a single button.
00009     
00010 */
00011 
00012 extern volatile bool button1_pressed;   // Used in the main loop
00013 extern volatile bool button1_enabled;   // Used for debouncing
00014 extern volatile int multiclick_state;   // Counts how many clicks occured in the time slot, used in main loop
00015 extern volatile int last_multiclick_state;   // Counts how many clicks occured in the previous timeslot
00016 extern volatile bool button1_busy;      // Informs the mainloop that the user is clicking the button
00017 extern volatile bool result_ready;
00018 
00019 void button1_multiclick_reset_cb(void); // Resets the amount of clicks, but stores this value for the usage in the main loop
00020 void button1_enabled_cb(void);          // Enables the button again after a timeout, used for debouncing the button 
00021 void button1_onpressed_cb(void);        // Callback which is called when the user presses the button