217 lines
7.4 KiB
C
217 lines
7.4 KiB
C
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#include "keyScan.h"
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/*************************************************************************************
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* 按键扫描判断的timer事件
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* 最终调用key_scan_init来注册事件
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*
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*
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**************************************************************************************/
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static void g_key_scan(key_channel_t *ch)
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{
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const keys_t *arg = ch->key_arg;
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uint8 key = ch->scan(ch);
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uint8 key_code = KEY_EVENT_MAX;
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uint8 key_event = KEY_EVENT_MAX;
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//分析按键情况
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//按键可能被释放或者说原本就是没有被按下
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if(key == 0)
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{
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//按键没有被按下,无需去管理
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if(ch->last_key == 0)
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{
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goto g_key_scan_end;
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}
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//按键从被按下到释放,反馈事件,有两种可能:短按释放,长按释放,异常情况则是(消抖没有完成就被释放)
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else
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{
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//异常事件,正常不可能存在,检查程序,可能存在按键抖动情况,不作任何判断
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if(ch->last_event == KEY_EVENT_MAX)
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{
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//printf("%s:%d err,last key:%d,now key:%d\tlast_event:%d\n",__FUNCTION__,__LINE__,ch->last_key,key,ch->last_event );
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//printf("last time:%d\tnow time:%d\n",ch->last_time,os_jiffies());
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}
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else if(ch->last_event == KEY_EVENT_LDOWN || ch->last_event == KEY_EVENT_REPEAT)
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{
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ch->last_event = KEY_EVENT_MAX;
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key_event = KEY_EVENT_LUP;
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key_code = ch->last_key;
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}
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else if(ch->last_event == KEY_EVENT_DOWN)
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{
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ch->last_event = KEY_EVENT_MAX;
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key_event = KEY_EVENT_SUP;
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key_code = ch->last_key;
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}
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ch->last_key = key;
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}
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}
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//有多种情况,key与last key不一样,分两种情况,按键抖动(相隔的时间太短),则以后面的key为准,并且时间清0,另一种则是按键检测的时候,错过了up的事件(因为用软定时,有可能错过,这个时候应该发出一个up事件,但也有可能按键接触不良,可以先发出up事件,key当作没有,等待下次的key再去判断)
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else
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{
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//同样按键,判断时间超出按键抖动范围,如果是,则发出被按下事件
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if(key == ch->last_key)
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{
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//上一次没有事件,则是消抖时间完成,发出按键按下事件
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if(ch->last_event == KEY_EVENT_MAX)
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{
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if(os_jiffies() - ch->last_time > arg->period_dither)
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{
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ch->last_event = KEY_EVENT_DOWN;
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key_event = KEY_EVENT_DOWN;
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key_code = ch->last_key;
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//无需更新时间,下一次则进入去判断是否长按
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ch->last_time = os_jiffies();
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}
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//消抖时间没有完成
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else
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{
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}
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}
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//上一次已经有down的事件,则需要继续判断后续的事件(是否为长按或者重复按键)
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else
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{
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//短按,超过长按的时间,发出长按被按下的事件
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if(ch->last_event == KEY_EVENT_DOWN )
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{
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if(os_jiffies() - ch->last_time > arg->period_long)
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{
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//长按事件被按下
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ch->last_event = KEY_EVENT_LDOWN;
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key_event = KEY_EVENT_LDOWN;
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key_code = ch->last_key;
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//用于判断是否是重复按键
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ch->last_time = os_jiffies();
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}
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//不是长按,还在等待时间
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else
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{
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}
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}
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else
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{
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if(ch->last_event == KEY_EVENT_LDOWN || ch->last_event == KEY_EVENT_REPEAT)
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{
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if(os_jiffies() - ch->last_time > arg->period_repeat)
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{
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ch->last_event = KEY_EVENT_REPEAT;
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key_event = KEY_EVENT_REPEAT;
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key_code = ch->last_key;
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//用于判断下一次判断
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ch->last_time = os_jiffies();
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}
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}
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else
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{
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os_printf("%s:%d err,last key:%d,now key:%d\tlast_event:%d\n",__FUNCTION__,__LINE__,ch->last_key,key,ch->last_event );
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}
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}
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}
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}
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//刚被按下,则记录时间,等待抖动结束
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if(!ch->last_key)
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{
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ch->last_time = os_jiffies();
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ch->last_key = key;
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}
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//两次按键不一致,那么就要去识别事件,如果last_event没有事件,代表消抖没有完成,则重新计算时间,如果消抖完成,则需要发出up事件,last_key = 0
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else if(ch->last_key != key)
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{
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//消抖没有完成,更新按键的值
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if(ch->last_event == KEY_EVENT_MAX)
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{
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ch->last_time = os_jiffies();
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ch->last_key = key;
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}
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//消抖完成,发出up事件,然后last_key设置为0,等待下次按键判断
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else
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{
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if(ch->last_event == KEY_EVENT_LDOWN || ch->last_event == KEY_EVENT_REPEAT)
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{
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ch->last_event = KEY_EVENT_MAX;
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key_event = KEY_EVENT_LUP;
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key_code = ch->last_key;
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}
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else if(ch->last_event == KEY_EVENT_DOWN)
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{
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ch->last_event = KEY_EVENT_MAX;
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key_event = KEY_EVENT_SUP;
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key_code = ch->last_key;
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ch->last_time = os_jiffies();
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}
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ch->last_key = 0;
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}
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}
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}
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g_key_scan_end:
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if(key_event != KEY_EVENT_MAX)
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{
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// key_map_t *map = ch->key_table_map;
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//uint32 map_msg = map[key_code][key_event];
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uint32 map_msg = (key_code<<8 | key_event);
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if(map_msg && ch->key_send)
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{
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ch->key_send(map_msg,ch->extern_value);
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}
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}
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}
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//timer事件
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static void key_auto_timer_cb(void *arg)
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{
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key_channel_t **channel = (key_channel_t **)arg;
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key_channel_t **ch;
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for (ch = &channel[0]; *ch; ++ch)
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{
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if(!(*ch)->enable)
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{
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continue;
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}
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if((*ch)->prepare)
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{
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(*ch)->prepare(*ch);
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}
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if((*ch)->scan)
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{
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g_key_scan(*ch);
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}
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}
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}
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static os_timer_t key_timer;
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//先初始化,然后注册timer,注册按键的映射表,最后启动timer
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void key_button_scan_init(key_channel_t **channel,key_send_msg send)
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{
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key_channel_t **ch = channel;
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for (; *ch; ++ch)
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{
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(*ch)->last_event = KEY_EVENT_MAX;
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(*ch)->last_key = KEY_EVENT_MAX;
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(*ch)->last_time = os_jiffies();
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(*ch)->key_send = send;
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if((*ch)->init)
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{
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(*ch)->init(*ch);
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}
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}
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os_timer_init(&key_timer, key_auto_timer_cb, OS_TIMER_MODE_PERIODIC, (void*)channel);
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os_timer_start(&key_timer, 5);
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}
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