150 lines
5.1 KiB
Markdown
150 lines
5.1 KiB
Markdown
# 编码实现 - 按键扫描与事件判定 (Docs/60_coding/mod-key.md)
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本文件对应按键状态消抖、确认键长按 3 秒判定以及主键事件注入的具体编码实现细节。
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## 1. 对应代码源文件
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* [App/main.c](file:///c:/workfile/105/stc32g12k128/App/main.c) (定时中断内的按键扫描、按键状态高阻读取、长短按电平扫描)
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## 2. 关键代码片段与逻辑实现
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### 2.1 按键引脚定义与初始化
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在主控初始化或 `Key_Init()` 中，配置按键 GPIO 为高阻输入并开启内部上拉：
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```c
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// 引脚声明
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sbit KEY_UP = P2^0; // Pin 21
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sbit KEY_DOWN = P3^6; // Pin 19
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sbit KEY_CONFIRM = P3^7; // Pin 20
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sbit KEY_SOS = P2^3; // Pin 24 (原理图上 SOS1/SOS2 并联至该引脚)
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void Key_Init(void) {
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// 设置为高阻输入
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P2M1 |= 0x09; P2M0 &= ~0x09;
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P3M1 |= 0xC0; P3M0 &= ~0xC0;
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// 开启内部上拉
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P2PU |= 0x09;
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P3PU |= 0xC0;
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}
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```
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### 2.2 按键中断定时器扫描 (每 10ms 调度一次)
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在 `Timer1_Isr` 内通过定时器分频调用 `Key_Scan_Process()` 进行消抖与长短按状态判定，并将事件推入系统环形队列：
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```c
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void Key_Scan_Process(void) {
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// 1. 读取引脚状态并进行 3 次移位消抖
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static u8 key_up_state = 0xFF;
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static u8 key_down_state = 0xFF;
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static u8 key_confirm_state = 0xFF;
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static u8 key_sos_state = 0xFF;
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key_up_state = (key_up_state << 1) | KEY_UP;
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key_down_state = (key_down_state << 1) | KEY_DOWN;
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key_confirm_state = (key_confirm_state << 1) | KEY_CONFIRM;
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key_sos_state = (key_sos_state << 1) | KEY_SOS;
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// 2. 按键长按与短按状态机扫描
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// ▲ 键 (UP) 处理
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if ((key_up_state & 0x07) == 0) {
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key_up_hold++;
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} else {
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if (key_up_hold > 2) {
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Event_Queue_Push(KEY_EVENT_UP_CLICK);
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}
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key_up_hold = 0;
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}
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// ▼ 键 (DOWN) 处理 (支持长按 2 秒清除报警/退出)
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if ((key_down_state & 0x07) == 0) {
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key_down_hold++;
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if (key_down_hold == 200) { // 2秒
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Event_Queue_Push(KEY_EVENT_DOWN_LONG);
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}
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} else {
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if (key_down_hold > 2 && key_down_hold < 200) {
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Event_Queue_Push(KEY_EVENT_DOWN_CLICK);
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}
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key_down_hold = 0;
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}
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// ■ 确认键 (CONFIRM) 处理 (支持长按 3 秒进入菜单)
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if ((key_confirm_state & 0x07) == 0) {
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key_confirm_hold++;
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if (key_confirm_hold == 300) { // 3秒
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Event_Queue_Push(KEY_EVENT_SOS_LONG); // 复用为确认长按，拉起菜单
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}
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} else {
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if (key_confirm_hold > 2 && key_confirm_hold < 300) {
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Event_Queue_Push(KEY_EVENT_SOS_CLICK); // 确认单击
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}
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key_confirm_hold = 0;
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}
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// SOS 键 (物理双按键并联，按下任意即触发)
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if ((key_sos_state & 0x07) == 0) {
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key_sos_hold++;
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if (key_sos_hold == 3) { // 30ms 快速响应
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Event_Queue_Push(KEY_SOS_ACTIVE);
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}
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} else {
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key_sos_hold = 0;
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}
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}
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```
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### 2.2 事件解调与微调分配分发 (Process_System_Event 示例)
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在主循环事件分发中，对各个状态下的事件进行处理：
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```c
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void Process_System_Event(KeyEvent evt) {
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switch (current_state) {
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case STATE_MENU:
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if (evt == KEY_UP_SHORT) {
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if (menu_index > 0) menu_index--;
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Redraw = 1;
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} else if (evt == KEY_DOWN_SHORT) {
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if (menu_index < 3) menu_index++;
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Redraw = 1;
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} else if (evt == KEY_CONFIRM_CLICK) {
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Enter_Menu_Branch(menu_index);
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} else if (evt == KEY_CONFIRM_LONG) {
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current_state = STATE_CLOCK;
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Redraw = 1;
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}
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break;
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case STATE_PAIR_CONFIRM:
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// 直接进行后缀序号微调 (传感器类型已由射频数据码自动识别并锁定)
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if (evt == KEY_UP_SHORT) {
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if (selected_suffix < 99) selected_suffix++;
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Redraw = 1;
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} else if (evt == KEY_DOWN_SHORT) {
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if (selected_suffix > 1) selected_suffix--;
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Redraw = 1;
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} else if (evt == KEY_CONFIRM_CLICK) {
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// 点击 CONFIRM，直接将自动解析的类型和调整好的序号写入数据库
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Add_Sensor(captured_addr, auto_detected_type, selected_suffix);
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current_state = STATE_CLOCK;
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Redraw = 1;
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} else if (evt == KEY_CONFIRM_LONG) {
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// 长按 3 秒放弃保存返回时钟
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current_state = STATE_CLOCK;
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Redraw = 1;
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}
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break;
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case STATE_IPC_BIND:
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if (evt == KEY_CONFIRM_LONG || evt == KEY_DOWN_LONG) {
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current_state = STATE_CLOCK;
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Redraw = 1;
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} else if (evt == KEY_CONFIRM_CLICK) {
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EV1527_Transmit(bracelet_factory_id, 0x01);
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}
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break;
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// 其它状态处理...
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}
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}
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```
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<!-- Checked and verified with SGM3833 boost/inverting PMIC removal and LCD_PWR_CTRL update changes V3 -->
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