BES（恒玄）平台复杂按键实现

昨天有说到 LED 的配置，关于UI 的三大组件：LED 、按键、提示音。今天就说下按键部分.

BES 平台里面包含了大部分按键代码：按键l类型分power 、普通GPIO按键 ADC 按键

按键事件有单击双击长按长长按重复等。先分析下默认按键的实现逻辑。

一、普通按键实现逻辑分析：

1.先看下普通按键：

从上结构体和按键注册表可以得知按键FN1对应的GPIO为 PIO_02，并且拉低（按下）有效，默认是高电平。

按键实现原理：

按键的按下和弹起会产生相应中断通知到按键处理函数（hal_gpiokey_irqhandler / hal_key.c）

所有的按键抖动都会通过硬件定时器 计时消抖触发并在hal_gpiokey_irqhandler 函数里面处理。处理后的按键事件通过函数

static int send_key_event(enum HAL_KEY_CODE_T code, enum HAL_KEY_EVENT_T event) 广播到应用层。

下面的宏定义表示按键时间，用户可以根据自定义修改按键事件长
#define CFG_SW_KEY_LLPRESS_THRESH_MS 4000
#define CFG_SW_KEY_LPRESS_THRESH_MS 1500
#define CFG_SW_KEY_REPEAT_THRESH_MS 500
#define CFG_SW_KEY_DBLCLICK_THRESH_MS 500
#define CFG_SW_KEY_INIT_DOWN_THRESH_MS 200
#define CFG_SW_KEY_INIT_LPRESS_THRESH_MS 6500
#define CFG_SW_KEY_INIT_LLPRESS_THRESH_MS 10000
#define CFG_SW_KEY_CHECK_INTERVAL_MS 25

//common key define // hardware ticks conversion to ms.
#define KEY_LONGLONGPRESS_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_LLPRESS_THRESH_MS)
#define KEY_LONGPRESS_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_LPRESS_THRESH_MS)
#define KEY_DOUBLECLICK_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_DBLCLICK_THRESH_MS)
#define KEY_LONGPRESS_REPEAT_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_REPEAT_THRESH_MS)

#define KEY_INIT_DOWN_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_INIT_DOWN_THRESH_MS)
#define KEY_INIT_LONGPRESS_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_INIT_LPRESS_THRESH_MS)
#define KEY_INIT_LONGLONGPRESS_THRESHOLD MS_TO_TICKS(CFG_SW_KEY_INIT_LLPRESS_THRESH_MS)

#define KEY_CHECKER_INTERVAL MS_TO_TICKS(CFG_SW_KEY_CHECK_INTERVAL_MS)

#define KEY_DEBOUNCE_INTERVAL (KEY_CHECKER_INTERVAL * 2)

2. 增加特殊按键事件比如：单击/双击/三击/四击后长按事件：

a. 在结构体中中增加两个数据表示当前按下次数：

struct HAL_KEY_STATUS_T {enum HAL_KEY_CODE_T code_down;enum HAL_KEY_CODE_T code_ready;enum HAL_KEY_CODE_T code_click;enum HAL_KEY_EVENT_T event;uint32_t time_updown;uint32_t time_click;uint8_t cnt_repeat;uint8_t cnt_click;uint8_t click_flag; // Record the current press times and count the subsequent long press events.uint8_t cnt_click_long_repeat;//Record the current press times and count the subsequent repeat events.
};

b. 修改按键弹起事件时候清除的上次按键事件类型：

if (up_new) {if (key_status.event == HAL_KEY_EVENT_LONGPRESS || key_status.event == HAL_KEY_EVENT_LONGLONGPRESS) {// LongPress is finished when all of the LongPress keys are releasedif ((code_down & key_status.code_ready) == 0) {key_status.event = HAL_KEY_EVENT_NONE;}} else if (key_status.event == HAL_KEY_EVENT_DOWN) {// Enter click handling if not in LongPresskey_status.event = HAL_KEY_EVENT_UP;} /***The key pops up to clear the last recorded event type***/else if(key_status.event >= HAL_KEY_EVENT_LONGPRESS&&key_status.event <= HAL_KEY_EVENT_LONGLONGPRESS_AFTER_RCLICK) {key_status.cnt_repeat = 0;           key_status.cnt_click = 0;key_status.click_flag = 0;          key_status.code_click = HAL_KEY_CODE_NONE;         key_status.event = HAL_KEY_EVENT_NONE;}
/***The key pops up to clear the last recorded event type***/}

c. 在按键弹起时候，记录按键次数，为后续长按事件做准备：

if (key_status.event == HAL_KEY_EVENT_UP) {if (key_status.code_click == HAL_KEY_CODE_NONE || key_status.code_click != key_status.code_ready) {if (key_status.code_click != HAL_KEY_CODE_NONE) {send_key_event(key_status.code_click, HAL_KEY_EVENT_CLICK + key_status.cnt_click);}key_status.code_click = key_status.code_ready;key_status.cnt_click = 0;key_status.click_flag = 1;key_status.time_click = time;} else if (up_new && (up_new | key_status.code_down) == key_status.code_click) {key_status.cnt_click++;key_status.click_flag++; /*Each time the button pops up, it increases by 1, which in turn means click/double click...*/key_status.time_click = time;}if (time - key_status.time_click >= KEY_DOUBLECLICK_THRESHOLD || key_status.cnt_click >= MAX_KEY_CLICK_COUNT) {if(key_status.cnt_click >= MAX_KEY_CLICK_COUNT)send_key_event(key_status.code_click, HAL_KEY_EVENT_RAMPAGECLICK);elsesend_key_event(key_status.code_click, HAL_KEY_EVENT_CLICK + key_status.cnt_click);key_status.code_click = HAL_KEY_CODE_NONE;key_status.cnt_click = 0;key_status.click_flag = 0; /*over max times*/key_status.event = HAL_KEY_EVENT_NONE;}}

d. 在按键按下去的时候修改如下代码：

if (key_status.event == HAL_KEY_EVENT_DOWN){if ((time - key_status.time_updown) >= MS_TO_TICKS(2000)&&(time - key_status.time_updown) <=MS_TO_TICKS(3500)){if (key_status.click_flag){key_status.cnt_click_long_repeat = 0;key_status.event = (HAL_KEY_EVENT_LONGPRESS_AFTER_CLICK+key_status.click_flag-1);send_key_event(key_status.code_ready, key_status.event);TRACE("press_time over 2s,KEY_CODE=%d\n",key_status.event);} }}if(key_status.event>HAL_KEY_EVENT_LONGPRESS&&key_status.event<HAL_KEY_EVENT_LONGLONGPRESS){if (time - key_status.time_updown >= KEY_LONGPRESS_THRESHOLD){key_status.event =key_status.event+(HAL_KEY_EVENT_LONGLONGPRESS-HAL_KEY_EVENT_LONGPRESS);send_key_event(key_status.code_ready, key_status.event);TRACE("press_time over 4s,KEY_CODE=%d\n",key_status.event);}key_status.cnt_repeat = 0;           key_status.cnt_click = 0;key_status.click_flag = 0;          key_status.code_click = HAL_KEY_CODE_NONE;         key_status.event = HAL_KEY_EVENT_NONE;}/*if(key_status.event == HAL_KEY_EVENT_LONGPRESS_AFTER_CLICK){key_status.cnt_click_long_repeat++;if(key_status.cnt_click_long_repeat == MS_TO_TICKS(500)/KEY_CHECKER_INTERVAL){key_status.cnt_click_long_repeat = 0;key_status.event = HAL_KEY_EVENT_LONGPRESS_AFTER_CLICK;send_key_event(key_status.code_ready, key_status.event);}}*/ /* If don't need to repeat the event after the click/double click, this section can give up.*/

按键底层修改整体代码如下链接：

https://share.weiyun.com/mwR5yWUO

二、按键应用层的实现原理、对接、修改

1. BES 按键的应用层衔接介绍:

类似于线程处理，考虑到按键的并发处理，所以所有的按键事件放在一个list 链表里面存储，处理完就删除当前节点。

hal_key_open(checkPwrKey, key_event_process);

这个函数开启了所有底层按键驱动，并且注册回调函数（key_detected_callback 即上面send_key_event）。即后续的按键事件都会通过 主线程下的app_key_handle_process 这个任务处理

2.单边（头戴式挂脖）按键配置表：

有多个按键可能会遇到组合按键，其实组合按键也可以说时现成的，我们看下按键的定义：

直接修改案件注册表就好了

3.TWS模式按键执行注册表：

值得说下的是 ,TWS耳机的按键很多时候时候需要由从耳转发到主耳：

三、外设触摸IC Senor检测按键

很多时候耳机不仅仅用自带的GPIO按键，还需要外设辅助按键

有了上面的分析，其实外设按键操作就比较简单了，在原有的按键体系中添加按键注册，执行销毁的相关操作就好了。

比如：触摸按键的初始化：

然后我们看下触摸按键的处理：

利用现有的案件处理如果触摸按键那边有动作，就会触发GPIO 中断然后通过I2C 读取按键状态值，利用回调函数广播按键事件。

#include "cmsis_os.h"
#include "hal_timer.h"
#include "app_key.h"
#include "apps.h"
#include "hal_trace.h"
//#include "btapp.h"#include "string.h"
#include "app_thread.h"
#include <hal_i2c.h>extern "C"{
#include "SX921x.h"
}struct info{
uint8_t keycode;
uint8_t keyevent;
};
struct info keyinfo[2];//common key define
#define TOUCHKEY_SINGLEPRESS_THRESHOLD          MS_TO_TICKS(1500)           //1500mS
#define TOUCHKEY_DEBOUNCE_INTERVAL          MS_TO_TICKS(40)         //40mS，中断延迟约50mS
#define TOUCHKEY_LONGPRESS_THRESHOLD        3000    ///3S
#define TOUCHKEY_CLICK_INTERVAL                 400     ///400mS
#define TOUCHKEY_STEADY_THRESHOLD           500     ///500mS///=============mack:add for touchkey=======================
void app_touchkey_handler(void const *param);
void app_longpress_handler(void const *param);
void app_inear_handler(void const *param);osTimerId click_interval_timer = NULL;
osTimerDef (CLICKINTV, app_touchkey_handler);
osTimerId longpress_timer = NULL;
osTimerDef (LPRESS,app_longpress_handler);osTimerId steady_timer = NULL;
osTimerDef (STEADY, app_inear_handler);
///=============end=========================================uint16_t keycode[2];      //閿€煎垵濮嬪寲  keyinfo[0].keycode = HAL_KEY_CODE_FN3; keyinfo[1].keycode = HAL_KEY_CODE_FN4;
uint8_t  keyevent;  //閿€煎垵濮嬪寲涓篐AL_KEY_EVENT_ULTRACLICK // APP灞傛墠鏈夐敭鍊奸€夐」:鍗曞嚮锛屽弻鍑伙紝涓夊嚮锛岄暱鎸夛紝鍗曞嚮+闀挎寜;閿€?閫夐」:鍏ヨ€筹紝鍑鸿€?
bool keystatus[2];      //1涓烘寜涓?鑰冲唴)锛?涓烘澗寮€(鑰冲)//extern int key_event_process(uint32_t key_code, uint8_t key_event);
extern int (*key_detected_callback)(uint32_t, uint8_t);static void SX921x_processing(uint8_t data)
{   /*******club 750 disable ph1  ,using ph0 +ph2 ********/if(data==0x05){       ///1:in_earif(!keystatus[1]){   //鑻ヤ箣鍓嶇姸鎬佹槸out_ear,鍒欐湰娆℃寜涓嬫湁鏁堬紱鍚﹀垯蹇界暐keystatus[1] =true;key_detected_callback(keycode[1],keyevent);TRACE(0,"The proximity sensor detects in-ear movement!\n");}}else{                //0:out_earif(keystatus[1]){    //鑻ヤ箣鍓嶇姸鎬佹槸in_ear,鍒欐湰娆℃寜涓嬫湁鏁堬紱鍚﹀垯蹇界暐keystatus[1] =false;key_detected_callback(keycode[1],keyevent);TRACE(0,"The proximity sensor detects out-ear movement!\n");}}
}static void message_send_handle(void){APP_MESSAGE_BLOCK msg;msg.mod_id = APP_MODUAL_SX9210;msg.msg_body.message_id = 0x00;msg.msg_body.message_ptr = (u32)NULL;msg.msg_body.message_Param0 = 0x00;/**clear IRQ**/msg.msg_body.message_Param1 = 0x01;/**read touthkey status**/app_mailbox_put(&msg);
}static int sx921x_irq_readreg(APP_MESSAGE_BODY *msg_body){u8 temp_data=0;if(msg_body->message_id!=0x00)  return -1;ReadButtons((u8)(msg_body->message_Param0)); //clear NIRQ to Highttemp_data=ReadButtons((u8)(msg_body->message_Param1));TRACE(1,"%s STAT0_REG=0x%x", __func__,temp_data);  SX921x_processing(temp_data);//SX921x_Calibration();return 0;
}static void app_SX921x_irqhandler(enum HAL_GPIO_PIN_T pin){(void)pin;//ReadButtons(SX921x_IRQSTAT_REG); //clear NIRQ to Hight//temp_data=ReadButtons(SX921x_STAT0_REG); /*Indicates if proximity is currently being detected for the corresponding phase. *//*(i.e. set when phase鈥檚 PROXDIFF value is above detection threshold; Cf. FARCOND for clearing) *//*[3:0] = [PH3, PH2, PH1, PH0]*///TRACE("%s STAT0_REG=0x%x", __func__,temp_data);  //SX921x_processing(temp_data);message_send_handle();
}static void touch_proximity_sensor_irq_enable(void){struct HAL_GPIO_IRQ_CFG_T gpiocfg;gpiocfg.irq_enable = true;gpiocfg.irq_debounce = true;gpiocfg.irq_type = HAL_GPIO_IRQ_TYPE_EDGE_SENSITIVE;gpiocfg.irq_polarity =HAL_GPIO_IRQ_POLARITY_LOW_FALLING;gpiocfg.irq_handler = app_SX921x_irqhandler;hal_gpio_setup_irq((enum HAL_GPIO_PIN_T)TOUTH_IRQ_PIN, &gpiocfg);
}static void touchkey_init(void){keycode[0]=HAL_KEY_CODE_FN3;  //HAL_KEY_CODE_FN3;     //artificial defined to app layer recognationkeycode[1]=HAL_KEY_CODE_FN4;keyevent=HAL_KEY_EVENT_ULTRACLICK;  app_set_threadhandle(APP_MODUAL_SX9210, sx921x_irq_readreg);//open message box
}void hal_touchkey_open(void){static struct HAL_I2C_CONFIG_T sx9210_i2c_cfg;struct HAL_IOMUX_PIN_FUNCTION_MAP SX921x_cfg_gpio={TOUTH_IRQ_PIN, HAL_IOMUX_FUNC_AS_GPIO,\HAL_IOMUX_PIN_VOLTAGE_VIO, HAL_IOMUX_PIN_NOPULL};hal_iomux_set_i2c1();sx9210_i2c_cfg.mode = HAL_I2C_API_MODE_TASK;sx9210_i2c_cfg.use_dma  = 0;sx9210_i2c_cfg.use_sync = 1;sx9210_i2c_cfg.speed = 20000;sx9210_i2c_cfg.as_master = 1;hal_i2c_open(HAL_I2C_ID_1, &sx9210_i2c_cfg);hal_iomux_init(&SX921x_cfg_gpio, 1);hal_gpio_pin_set_dir((enum HAL_GPIO_PIN_T) SX921x_cfg_gpio.pin, HAL_GPIO_DIR_IN, 1);touch_proximity_sensor_irq_enable();InitSX921x();osDelay(10);ReadButtons(SX921x_IRQSTAT_REG); //clear NIRQ to Highttouchkey_init();REL_TRACE(1,"hal_touchkey_open successful!");
}void hal_touchkey_close(void){/*hal_gpiokey_disable_irq(HAL_IOMUX_PIN_P0_2);*/struct HAL_GPIO_IRQ_CFG_T gpiocfg = {false,false,HAL_GPIO_IRQ_TYPE_EDGE_SENSITIVE,\HAL_GPIO_IRQ_POLARITY_HIGH_RISING,NULL};SX921x_suspend();        //disable SX9210app_set_threadhandle(APP_MODUAL_SX9210, NULL);//close message boxhal_gpio_setup_irq((enum HAL_GPIO_PIN_T)TOUTH_IRQ_PIN, &gpiocfg);/*===================关闭 I2C通讯======================*/hal_i2c_close(HAL_I2C_ID_1);   //close I2CREL_TRACE(0,"hal_touchkey_close !");
}void app_touch_key(APP_KEY_STATUS *status, void *param)
{static uint32_t period[3];     //用于按键计时，period[0]按下时间；period[1]松开后间隔时间；uint32_t time;switch(status->code){case HAL_KEY_CODE_FN3:if(keystatus[0] ==true){///1:pressedosTimerStop(click_interval_timer);//400mS double click interval timer;osTimerStart(longpress_timer,TOUCHKEY_LONGPRESS_THRESHOLD);    //3S longpresstimer;time = hal_sys_timer_get();period[0]=time;                //record pressed time stamp;period[2] =time-period[1];     //record key intv period;period[1] =0;                 //clear released time stamp;}else{      ///0:releasedosTimerStop(longpress_timer);      //清1.5S长按timer;time = hal_sys_timer_get();period[1] =time;                //record released time stamp;TRACE(1,"time-period[0]=%d ms\n",TICKS_TO_MS(time-period[0]));if((time-period[0]) >TOUCHKEY_DEBOUNCE_INTERVAL && (time-period[0]) <TOUCHKEY_SINGLEPRESS_THRESHOLD)    //80mS~1.5S{if(keyinfo[0].keyevent<3){   ///3 鍑讳簨浠?keyinfo[0].keyevent++;}if(keyinfo[0].keyevent>2){if((period[2]*13>(time-period[1])*10)&&(period[2]*7<(time-period[1])*10)){    //+-30%余度osTimerStart(click_interval_timer,40);    //40mS后即上传键值,不必再等按键间隔；period[2]=0;      //clear intv period;}}period[0] =0;        //clear pressed time stamp;osTimerStart(click_interval_timer,TOUCHKEY_CLICK_INTERVAL);  //启动400mS muticlicktimer;TRACE(1,"click_interval_timer start\n");}    }break;
///========================================================== case HAL_KEY_CODE_FN4:
//          app_voice_report(APP_STATUS_INDICATION_GSOUND_MIC_OPEN,0);  if(keystatus[1] ==true){///1:pressed///1:in_earkeyinfo[1].keyevent =true;osTimerStop(steady_timer);osTimerStart(steady_timer, TOUCHKEY_STEADY_THRESHOLD);    //启动500mS steady_timer;}else{                       ///0:out_earkeyinfo[1].keyevent =false;osTimerStop(steady_timer);osTimerStart(steady_timer, TOUCHKEY_STEADY_THRESHOLD);    //启动500mS steady_timer;}break;}/*if(status->code==HAL_KEY_CODE_FN4&&status->event=HAL_KEY_EVENT_CLICK)bt_key_handle_func_click();*/
}void app_longpress_handler(void const *param)
{///send key_code key_event to app layer(by key_event_process())if(keyinfo[0].keyevent ==1){  //单击1次+长按//TRACE(2,"keycode=0x%X  keyevent =0x%X  ========click+longpress========\n",keyinfo[0].keycode,keyinfo[0].keyevent+16);key_detected_callback(HAL_KEY_CODE_FN3,HAL_KEY_EVENT_UP_AFTER_LONGPRESS);}else{//TRACE(2,"keycode=0x%X  keyevent =0x%X  =============longpress===========\n",keyinfo[0].keycode,16); //仅长按key_detected_callback(HAL_KEY_CODE_FN3,HAL_KEY_EVENT_LONGPRESS);}  keyinfo[0].keyevent=0;keystatus[0]=0;}void app_touchkey_handler(void const *param)
{if(keyinfo[0].keyevent){if(keyinfo[0].keyevent==1){//TRACE(2,"keycode=0x%X  keyevent =0x%X    =========single click==========\n ",keyinfo[0].keycode,keyinfo[0].keyevent);key_detected_callback(keyinfo[0].keycode,HAL_KEY_EVENT_CLICK);}else if(keyinfo[0].keyevent==2){//TRACE(2,"keycode=0x%X  keyevent =0x%X   =========double click==========\n ",keyinfo[0].keycode,keyinfo[0].keyevent);key_detected_callback(keyinfo[0].keycode,HAL_KEY_EVENT_DOUBLECLICK);}else{//TRACE(2,"keycode=0x%X  keyevent =0x%X  ========== triple click==========\n ",keyinfo[0].keycode,keyinfo[0].keyevent);key_detected_callback(keyinfo[0].keycode,HAL_KEY_EVENT_TRIPLECLICK);}}keyinfo[0].keyevent=0;keystatus[0]=0;
}void app_inear_handler(void const *param)
{if(keyinfo[1].keyevent){//TRACE(2,"keycode=0x%X  keystatus =0x%X  =========== in ear===========\n",keyinfo[1].keycode,keyinfo[1].keyevent);key_detected_callback(keyinfo[1].keycode,HAL_KEY_EVENT_DOWN);}else{//TRACE(2,"keycode=0x%X  keystatus =0x%X  ==========out ear==========\n",keyinfo[1].keycode,keyinfo[1].keyevent);key_detected_callback(keyinfo[1].keycode,HAL_KEY_EVENT_UP);}
}void app_touchkey_open(void)
{keyinfo[0].keycode = HAL_KEY_CODE_FN3;keyinfo[1].keycode = HAL_KEY_CODE_FN4;click_interval_timer     =osTimerCreate(osTimer(CLICKINTV),osTimerOnce,NULL);steady_timer       =osTimerCreate(osTimer(STEADY),osTimerOnce,NULL);longpress_timer   =osTimerCreate(osTimer(LPRESS),osTimerOnce,NULL);hal_touchkey_open();
//    app_set_threadhandle(APP_MODUAL_KEY, app_key_handle_process);
}void app_touchkey_close(void){hal_touchkey_close();/*==================关闭timer====================*/if (click_interval_timer) {osTimerStop(click_interval_timer);osTimerDelete(click_interval_timer);click_interval_timer = NULL;}if (longpress_timer) {osTimerStop(longpress_timer);osTimerDelete(longpress_timer);longpress_timer = NULL;}if (steady_timer) {osTimerStop(steady_timer);osTimerDelete(steady_timer);steady_timer = NULL;}/*key_detected_callback = NULL;return 0;*/
}

触摸按键的销毁：

按键的大致类型介绍和讲解就到这里了。欢迎大家继续关注，下一个章节介绍提示音相关问题和解决办法。

QQ：1902026113

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