137 lines
4.6 KiB
Markdown
137 lines
4.6 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 按键中断定时器扫描 (每 10ms 调度一次)
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在 `Timer1_Isr` (1ms 滴答) 内，通过 `key_scan_timer` 进行 10ms 分频并调用 `Key_Scan_Process()`：
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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_sos1_state = 0xFF;
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static u8 key_sos2_state = 0xFF;
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u8 key_sos_state;
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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_sos1_state = (key_sos1_state << 1) | KEY_SOS1;
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key_sos2_state = (key_sos2_state << 1) | KEY_SOS2;
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// 双上部 SOS 键的逻辑并联
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key_sos_state = key_sos1_state & key_sos2_state;
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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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key_event_buf = KEY_UP_SHORT;
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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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key_event_buf = KEY_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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key_event_buf = KEY_DOWN_SHORT;
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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/退出)
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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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key_event_buf = KEY_CONFIRM_LONG;
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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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key_event_buf = KEY_CONFIRM_CLICK;
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}
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key_confirm_hold = 0;
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}
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// 并联 SOS 键
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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) {
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key_event_buf = 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 V2 -->
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