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MultiButton
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pull/8/head
Jaup 9 years ago
parent 1d8b53260d
commit a791d64dee
4 changed files with 2 additions and 267 deletions
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203
button.c
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/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* All rights reserved
*/
#include "button.h"
#define EVENT_CB(ev) if(handle->cb[ev])handle->cb[ev]((Button*)handle)
//button handle list head.
static struct Button* head_handle = NULL;
/**
* @brief Initializes the button struct handle.
* @param handle: the button handle strcut.
* @param pin_level: read the HAL GPIO of the connet button level.
* @param active_level: pressed GPIO level.
* @retval None
*/
void button_init(struct Button* handle, uint8_t(*pin_level)(), uint8_t active_level)
{
memset(handle, sizeof(struct Button), 0);
handle->event = (uint8_t)NONE_PRESS;
handle->hal_button_Level = pin_level;
handle->button_level = handle->hal_button_Level();
handle->active_level = active_level;
}
/**
* @brief Attach the button event callback function.
* @param handle: the button handle strcut.
* @param event: trigger event type.
* @param cb: callback function.
* @retval None
*/
void button_attach(struct Button* handle, PressEvent event, BtnCallback cb)
{
handle->cb[event] = cb;
}
/**
* @brief Inquire the button event happen.
* @param handle: the button handle strcut.
* @retval button event.
*/
PressEvent get_button_event(struct Button* handle)
{
return (PressEvent)(handle->event);
}
/**
* @brief Button driver core function, driver state machine.
* @param handle: the button handle strcut.
* @retval None
*/
void button_handler(struct Button* handle)
{
uint8_t read_gpio_level = handle->hal_button_Level();
//ticks counter working..
if((handle->state) > 0) handle->ticks++;
/*------------button debounce handle---------------*/
if(read_gpio_level != handle->button_level) { //not equal to prev one
//continue read 3 times same new level change
if(++(handle->debounce_cnt) >= DEBOUNCE_TICKS) {
handle->button_level = read_gpio_level;
handle->debounce_cnt = 0;
}
} else { //leved not change ,counter reset.
handle->debounce_cnt = 0;
}
/*-----------------State machine-------------------*/
switch (handle->state) {
case 0:
if(handle->button_level == handle->active_level) { //start press down
handle->event = (uint8_t)PRESS_DOWN;
EVENT_CB(PRESS_DOWN);
handle->ticks = 0;
handle->repeat = 1;
handle->state = 1;
}
break;
case 1:
if(handle->button_level != handle->active_level) { //released press up
handle->event = (uint8_t)PRESS_UP;
EVENT_CB(PRESS_UP);
handle->ticks = 0;
handle->state = 2;
} else if(handle->ticks > LONG_TICKS) {
handle->event = (uint8_t)LONG_RRESS_START;
EVENT_CB(LONG_RRESS_START);
handle->state = 5;
}
break;
case 2:
if(handle->button_level == handle->active_level) { //press down again
handle->event = (uint8_t)PRESS_DOWN;
EVENT_CB(PRESS_DOWN);
handle->repeat++;
if(handle->repeat == 2) {
handle->event = (uint8_t)DOUBLE_CLICK;
EVENT_CB(DOUBLE_CLICK); // repeat hit
} else {
handle->event = (uint8_t)PRESS_REPEAT;
}
EVENT_CB(PRESS_REPEAT); // repeat hit
handle->ticks = 0;
handle->state = 3;
} else if(handle->ticks > SHORT_TICKS) {
if(handle->repeat == 1) {
handle->event = (uint8_t)SINGLE_CLICK;
EVENT_CB(SINGLE_CLICK);
}
handle->state = 0;
handle->event = (uint8_t)NONE_PRESS;
}
break;
case 3:
if(handle->button_level != handle->active_level) { //released press up
handle->event = (uint8_t)PRESS_UP;
EVENT_CB(PRESS_UP);
if(handle->ticks < SHORT_TICKS) {
handle->ticks = 0;
handle->state = 2; //repeat press
} else {
handle->state = 0;
handle->event = (uint8_t)NONE_PRESS;
}
}
break;
case 5:
if(handle->button_level == handle->active_level) {
//continue hold trigger
handle->event = (uint8_t)LONG_PRESS_HOLD;
EVENT_CB(LONG_PRESS_HOLD);
} else { //releasd
handle->event = (uint8_t)PRESS_UP;
EVENT_CB(PRESS_UP);
handle->state = 0; //reset
handle->event = (uint8_t)NONE_PRESS;
}
break;
}
}
/**
* @brief Start the button work, add the handle into work list.
* @param btn: target handle strcut.
* @retval 0: succeed. -1: already exist.
*/
int button_start(struct Button* btn)
{
struct Button* target = head_handle;
while(target) {
if(target == btn) return -1; //already exist.
target = target->next;
}
btn->next = head_handle;
head_handle = btn;
return 0;
}
/**
* @brief Stop the button work, remove the handle off work list.
* @param btn: target handle strcut.
* @retval None
*/
void button_stop(struct Button* btn)
{
struct Button** curr;
for(curr = &head_handle; *curr; ) {
struct Button* entry = *curr;
if (entry == btn) {
*curr = entry->next;
// free(entry);
} else
curr = &entry->next;
}
}
/**
* @brief background ticks, timer repeat invoking interval 5ms.
* @param None.
* @retval None
*/
void button_ticks()
{
struct Button* target;
for(target=head_handle; target; target=target->next) {
button_handler(target);
}
}

62
button.h
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/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* All rights reserved
*/
#ifndef _BUTTON_H_
#define _BUTTON_H_
#include "stdint.h"
#include "string.h"
//According to your need to modify the constants.
#define TICKS_INTERVAL 5 //ms
#define DEBOUNCE_TICKS 4 //MAX 8
#define SHORT_TICKS (300 /TICKS_INTERVAL)
#define LONG_TICKS (1000 /TICKS_INTERVAL)
typedef void (*BtnCallback)(void*);
typedef enum {
PRESS_DOWN = 0,
PRESS_UP,
PRESS_REPEAT,
SINGLE_CLICK,
DOUBLE_CLICK,
LONG_RRESS_START,
LONG_PRESS_HOLD,
number_of_event,
NONE_PRESS
}PressEvent;
typedef struct Button {
uint16_t ticks;
uint8_t repeat : 4;
uint8_t event : 4;
uint8_t state : 3;
uint8_t debounce_cnt : 3;
uint8_t active_level : 1;
uint8_t button_level : 1;
uint8_t (*hal_button_Level)(void);
BtnCallback cb[number_of_event];
struct Button* next;
}Button;
#ifdef __cplusplus
extern "C" {
#endif
void button_init(struct Button* handle, uint8_t(*pin_level)(), uint8_t active_level);
void button_attach(struct Button* handle, PressEvent event, BtnCallback cb);
PressEvent get_button_event(struct Button* handle);
int button_start(struct Button* btn);
void button_stop(struct Button* btn);
void button_ticks(void);
#ifdef __cplusplus
}
#endif
#endif

2
examples/event_callback.c
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#include "button.h"
#include "multi_button.h"
struct Button btn1;
struct Button btn2;

2
examples/event_inquire.c
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#include "button.h"
#include "multi_button.h"
struct Button btn1;

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