Miguel Angel Caycho / Mbed OS Pruebas_Ventilador_Eplimin_01_Backup

para el ventilador

Dependencies:   QEI FastPWM

buttons.h@13:e0a6033cb39d, 2020-05-15 (annotated)

Committer:
miguelangelpachas
Date:
Fri May 15 20:40:44 2020 +0000
Revision:
13:e0a6033cb39d
Parent:
11:5cb7ae8bd831 
para el ventilador

Who changed what in which revision?

UserRevisionLine numberNew contents of line
miguelangel_2511 0:9d0b9785d3d6 1 #ifndef BUTTONS_H_
miguelangel_2511 0:9d0b9785d3d6 2 #define BUTTONS_H_
miguelangel_2511 0:9d0b9785d3d6 3
miguelangel_2511 0:9d0b9785d3d6 4 #include "mbed.h"
miguelangel_2511 0:9d0b9785d3d6 5 #include "stdint.h"
miguelangel_2511 0:9d0b9785d3d6 6 #include "project_defines.h"
miguelangel_2511 0:9d0b9785d3d6 7
miguelangel_2511 0:9d0b9785d3d6 8 /* Object declaration */
miguelangel_2511 0:9d0b9785d3d6 9 extern BusIn buttons;
miguelangel_2511 0:9d0b9785d3d6 10
miguelangel_2511 0:9d0b9785d3d6 11 /* Global variable declaration */
miguelangel_2511 0:9d0b9785d3d6 12 extern volatile uint8_t button_state; // debounced button state (bit == 1: button pressed)
miguelangel_2511 0:9d0b9785d3d6 13 extern volatile uint8_t button_press; // button press detect
miguelangel_2511 0:9d0b9785d3d6 14
miguelangel_2511 0:9d0b9785d3d6 15 /* Functions declaration */
miguelangel_2511 0:9d0b9785d3d6 16 void Buttons_Initialize(void);
miguelangel_2511 0:9d0b9785d3d6 17 uint8_t Get_Button_Press(uint8_t button_mask);
miguelangel_2511 0:9d0b9785d3d6 18
miguelangel_2511 0:9d0b9785d3d6 19
miguelangel_2511 0:9d0b9785d3d6 20 /***********************************************************************
miguelangel_2511 0:9d0b9785d3d6 21 buttonDebounce: Check if a button has changed and keeps its new value
miguelangel_2511 0:9d0b9785d3d6 22 (HIGH or LOW) for 03 periods of time.
miguelangel_2511 0:9d0b9785d3d6 23 ************************************************************************/
miguelangel_2511 0:9d0b9785d3d6 24
miguelangel_2511 0:9d0b9785d3d6 25 static inline void Button_Debounce(void){
miguelangel_2511 0:9d0b9785d3d6 26 static unsigned char ct0, ct1;
miguelangel_2511 0:9d0b9785d3d6 27 unsigned char k = 0;
miguelangel_2511 0:9d0b9785d3d6 28
miguelangel_2511 0:9d0b9785d3d6 29 k = button_state ^ (~buttons); // button changed ?
miguelangel_2511 0:9d0b9785d3d6 30 ct1 = (ct0 ^ ct1) & k; // reset or count ct1
miguelangel_2511 0:9d0b9785d3d6 31 ct0 = (~ct0) & k; // reset or count ct0
miguelangel_2511 0:9d0b9785d3d6 32 k &= ct0 & ct1; // count until roll over
miguelangel_2511 0:9d0b9785d3d6 33 button_state ^= k; // then toggle debounced state
miguelangel_2511 0:9d0b9785d3d6 34 button_press |= button_state & k; // 0->1: button press detect
miguelangel_2511 0:9d0b9785d3d6 35
miguelangel_2511 0:9d0b9785d3d6 36 }
miguelangel_2511 0:9d0b9785d3d6 37
miguelangel_2511 0:9d0b9785d3d6 38
miguelangel_2511 0:9d0b9785d3d6 39 #endif /* BUTTONS_H_ */