我所采用的菜单是基于一个开源的按键组件，感兴趣的同学可以先去了解一下
开源按键组件MultiButton支持菜单操作(事件驱动型)
第1期 | MultiButton，一个小巧简单易用的事件驱动型按键驱动模块
该组件的优点在于可以无限的扩容按键的使用，且该菜单简洁易懂，看不懂的同学可以直接移植到对应的单片机上，然后一个一个更改参数来慢慢理解。具体的原理实现就不细讲，主要讲如何使用。
首先将multi_button.c和multi_button.h文件复制到工程目录中
multi_button.c
/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* All rights reserved
*/
#include "multi_button.h"
#include "headfile.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, 0, sizeof(struct Button));
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;
} else {
handle->event = (uint8_t)NONE_PRESS;
}
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_PRESS_START;
EVENT_CB(LONG_PRESS_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++;
EVENT_CB(PRESS_REPEAT); // repeat hit
handle->ticks = 0;
handle->state = 3;
} else if(handle->ticks > SHORT_TICKS) { //released timeout
if(handle->repeat == 1) {
handle->event = (uint8_t)SINGLE_CLICK;
EVENT_CB(SINGLE_CLICK);
} else if(handle->repeat == 2) {
handle->event = (uint8_t)DOUBLE_CLICK;
EVENT_CB(DOUBLE_CLICK); // repeat hit
}
handle->state = 0;
}
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;
}
}
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
}
break;
}
}
/**
* @brief Start the button work, add the handle into work list.
* @param handle: target handle strcut.
* @retval 0: succeed. -1: already exist.
*/
int button_start(struct Button* handle)
{
struct Button* target = head_handle;
while(target) {
if(target == handle) return -1; //already exist.
target = target->next;
}
handle->next = head_handle;
head_handle = handle;
return 0;
}
/**
* @brief Stop the button work, remove the handle off work list.
* @param handle: target handle strcut.
* @retval None
*/
void button_stop(struct Button* handle)
{
struct Button** curr;
for(curr = &head_handle; *curr; ) {
struct Button* entry = *curr;
if (entry == handle) {
*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);
}
}
multi_button.h：
/*
* Copyright (c) 2016 Zibin Zheng <znbin@qq.com>
* All rights reserved
*/
#ifndef _MULTI_BUTTON_H_
#define _MULTI_BUTTON_H_
#include <stdint.h>
#include <string.h>
//According to your need to modify the constants.
#define TICKS_INTERVAL 10 //ms
#define DEBOUNCE_TICKS 2 //MAX 8
#define SHORT_TICKS (300 /TICKS_INTERVAL)
#define LONG_TICKS (1000 /TICKS_INTERVAL)
typedef void (*BtnCallback)(void*);
typedef enum {
PRESS_DOWN = 0, //按键按下，每次按下都触发
PRESS_UP, //按键弹起，每次松开都触发
PRESS_REPEAT, //重复按下触发，变量repeat计数连击次数
SINGLE_CLICK, //单击按键事件
DOUBLE_CLICK, //双击按键事件
LONG_PRESS_START, //达到长按时间阈值时触发一次
LONG_PRESS_HOLD, //长按期间一直触发
number_of_event, //事件种类数
NONE_PRESS
}PressEvent;
typedef struct Button {
uint16_t ticks;
uint8_t repeat : 4; // 记录连击次数
uint8_t event : 4; // 记录具体事件
uint8_t state : 3; // 下一个要跳转的状态，用于状态的切换
uint8_t debounce_cnt : 3; // 记录持续次数（每次固定时间，用于去抖）
uint8_t active_level : 1; // 有效电平（按键按下时的电平）
uint8_t button_level : 1; // 记录当前的电平
uint8_t (*hal_button_Level)(void); // 函数指针（指向获取当前按键电平的函数）
BtnCallback cb[number_of_event]; // 函数指针数组：分别指向各个事件的回调函数
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* handle);
void button_stop(struct Button* handle);
void button_ticks(void);
#ifdef __cplusplus
}
#endif
#endif
最后将button_ticks（void）函数放入中断中，以用来检测按键状态。也可以放入364的另外一个核中，具体的两个核操作方式以后可能会简单介绍，因为我写的也很烂。
如上.h文件所示，每个按键都具备用按下触发，弹起触发，单击双击等模式，我之前试过可使用一个按键来实现菜单的功能，就是不停的单击双击长按会混淆每个模式所对应的函数，建议还是4个按键，大体可分两个按键负责页面的上下移动，两个按键负责进入和退出二级菜单。
移植好按键的固件，下面需要对按键进行每个按键功能的定义。与上一样，可在工程目录中新建button.c和button.h文件。
button.c：
#include "button.h"
#include "headfile.h"
static const PIN_enum key_pin[4] = {P22_3, P22_2, P22_1, P22_0}, //存放的是对应按键的引脚
dial_pin[4] = {P33_4, P33_5,P33_13,P33_12}; //存放对应拨码开关的引脚，用于之后修改菜单参数的数量级
static Button buttons[4];
IFX_INLINE static void assignments(void) {
button_attach(&buttons[0], SINGLE_CLICK, button1_change_single);
button_attach(&buttons[0], DOUBLE_CLICK, button1_change_double);
button_attach(&buttons[0], LONG_PRESS_START, button1_change_long);
//定义P22_3引脚，单击，双击，长按所对应的功能函数，即第三个参数
button_attach(&buttons[1], SINGLE_CLICK, button2_change_single);
button_attach(&buttons[1], DOUBLE_CLICK, button2_change_double);
button_attach(&buttons[1], LONG_PRESS_START, button2_change_long);
//同上
button_attach(&buttons[2], SINGLE_CLICK, ui_key_yes_click); //同上，单击yes进入二级菜单
button_attach(&buttons[3], SINGLE_CLICK, ui_key_no_click); //同上，单击no退出二级菜单
}
uint8_t key0_read(void) {
return gpio_get(key_pin[0]);
}
uint8_t key1_read(void) {
return gpio_get(key_pin[1]);
}
uint8_t key2_read(void) {
return gpio_get(key_pin[2]);
}
uint8_t key3_read(void) {
return gpio_get(key_pin[3]);
}
uint8_t dial_read(uint8_t id) {
return gpio_get(dial_pin[id]);
}
void buzzer_init(void){
gpio_init(BEEP_PIN, GPO, 1, PUSHPULL);
}
void key_init(void) {
button_init(&buttons[0], key0_read, 0);
button_init(&buttons[1], key1_read, 0);
button_init(&buttons[2], key2_read, 0);
button_init(&buttons[3], key3_read, 0);
assignments();
for (int i = 0; i < 4; ++i) {
gpio_init(key_pin[i], GPI, 0, NO_PULL);
//gpio_init(dial_pin[i], GPI, 0, NO_PULL);
button_start(&buttons[i]);
}
}button.h
#ifndef _button_H_
#define _button_H_
#include "StdIf/IfxStdIf_DPipe.h"
#include "PLATFORM_TYPES.H"
#include "common.h"
#include <stdint.h>
//#define BEEP_PIN P33_10
#define BEEP_PIN P10_5
#define buzzer_on gpio_set(BEEP_PIN,0)
#define buzzer_off gpio_set(BEEP_PIN,1)
extern uint8 ips200_show_flag;
void key_init(void);
void buzzer_init();
uint8_t dial_read(uint8_t id);
#endif具体的按键调用函数如下，下一章就是对菜单页进行编写。
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