sys_hw/keypad.c

#include "keypad.h"
#include "string.h"
#include "../supwisdom/sp_util.h"
#include "drv_adc.h"
//#include "timer.h"
//#include "Include_All.H"
//#include "glcd.h"
//#include "dbg.h"

#define __key_dbg_en__  0
#if(__key_dbg_en__)
#define key_dbg(...)   dbg(__VA_ARGS__)
#else
#define key_dbg(...)
#endif

#define KEY_DOWN_THRESHOLD    300u
#define KEY_UP_THRESHOLD      100u

struct key_sta_t
{
	volatile uint16_t adc_val_pre;
	volatile uint16_t adc_val_last;
	volatile uint16_t adc_val_now;
	volatile uint16_t down_timer;
	volatile uint8_t  adc_chg_cnt;
	volatile uint8_t  is_pressed;
	volatile uint8_t  is_pressed_long;
	volatile uint8_t  long_pressed_timer;
};

struct
{
	volatile uint8_t   is_inited;
	volatile uint8_t   lock;
	volatile uint16_t  key_value;
	struct   key_sta_t key_sta[MAX_KEY_NUM];
} keypad;

uint8_t keypad_init(void)
{
	uint8_t i;

	keypad.is_inited = 0;
	memset(&keypad, 0, sizeof(keypad));
	Delay_ms(500);
	for(i=0; i<MAX_KEY_NUM; i++)
	{
		keypad.key_sta[i].adc_val_pre = adc_get_val(i);
	}
	keypad.is_inited = 1;
	return 0;
}

__weak void keypad_cb_on_preesed(uint8_t key_val)
{

}

uint8_t keypad_get_key(void)
{
	if(keypad.key_value != KEY_NONE)
	{
		uint8_t temp = keypad.key_value;

		keypad.key_value = KEY_NONE;
		keypad_cb_on_preesed(temp);
		return temp;
	}
	return KEY_NONE;
}

void keypad_scan(void)
{
	uint8_t i;
	uint16_t max_delt = 0;
	uint8_t  key_idx  = MAX_KEY_NUM;

	key_dbg("\r\nsys_tick:%u\r\n", sys_timer_tick);
	for(i=0; i<MAX_KEY_NUM; i++)
	{
		keypad.key_sta[i].adc_val_now = adc_get_val(i);
		if(keypad.key_sta[i].adc_val_pre == 0)
		{
			keypad.key_sta[i].adc_val_pre = adc_get_val(i);
			return;
		}
		if(keypad.key_sta[i].adc_val_last == 0)
		{
			keypad.key_sta[i].adc_val_last = adc_get_val(i);
			return;
		}

		if(keypad.key_sta[i].down_timer)
		{
			keypad.key_sta[i].down_timer --;
			if(!keypad.key_sta[i].down_timer)
			{
				keypad.key_sta[i].is_pressed = 0;
				keypad.key_value = i+1;
				keypad.key_sta[i].adc_val_last = keypad.key_sta[i].adc_val_now;
				keypad.key_sta[i].adc_val_pre  = keypad.key_sta[i].adc_val_now;
				keypad.lock = 0;
			}
		}

		if((keypad.key_sta[i].adc_val_now > keypad.key_sta[i].adc_val_last)&&(!keypad.key_sta[i].is_pressed)&&(!keypad.lock))
		{
			uint16_t temp_delt = keypad.key_sta[i].adc_val_now - keypad.key_sta[i].adc_val_last;

			if(temp_delt > KEY_DOWN_THRESHOLD)
			{
				if(keypad.key_sta[i].adc_chg_cnt<10)
				{
					keypad.key_sta[i].adc_chg_cnt ++;
				}

				if(temp_delt>max_delt)
				{
					max_delt = temp_delt;
					key_idx  = i;
				}
				else
				{
					keypad.key_sta[i].adc_chg_cnt  = 0;
				}
			}
			else
			{
				keypad.key_sta[i].adc_val_last = keypad.key_sta[i].adc_val_pre;
				keypad.key_sta[i].adc_val_pre = keypad.key_sta[i].adc_val_now;
				keypad.key_sta[i].adc_chg_cnt  = 0;
				keypad.key_sta[i].is_pressed_long = 0;
			}
		}
		else
		{
			if(keypad.key_sta[i].is_pressed)
			{
				if(keypad.key_sta[i].adc_val_now < keypad.key_sta[i].adc_val_pre)
				{
					if((keypad.key_sta[i].adc_val_pre - keypad.key_sta[i].adc_val_now) > KEY_UP_THRESHOLD)
					{
						keypad.key_sta[i].adc_chg_cnt ++;
					}
				}
				else
				{
					keypad.key_sta[i].adc_chg_cnt = 0;
				}

				if(keypad.key_sta[i].adc_chg_cnt > 1)
				{
					keypad.key_value = i+1;
					keypad.key_sta[i].adc_val_last = keypad.key_sta[i].adc_val_pre;
					keypad.key_sta[i].adc_val_pre  = keypad.key_sta[i].adc_val_now;
					keypad.key_sta[i].adc_chg_cnt = 0;
					keypad.key_sta[i].is_pressed = 0;
					keypad.key_sta[i].down_timer = 0;
					keypad.key_sta[i].is_pressed_long = 0;
					keypad.lock = 0;
				}
			}
			else
			{
				keypad.key_sta[i].adc_val_last = keypad.key_sta[i].adc_val_pre;
				keypad.key_sta[i].adc_val_pre  = keypad.key_sta[i].adc_val_now;
				keypad.key_sta[i].adc_chg_cnt  = 0;
				keypad.key_sta[i].is_pressed_long = 0;
			}
		}
		key_dbg("%02u:%4hu,%4hu,%4hu,%4hu,%4hhu,%4hhu,%4hhu,%4hhu\r\n", i,
		        keypad.key_sta[i].adc_val_pre,
		        keypad.key_sta[i].adc_val_last,
		        keypad.key_sta[i].adc_val_now,
		        keypad.key_sta[i].down_timer,
		        keypad.key_sta[i].adc_chg_cnt,
		        keypad.key_sta[i].is_pressed,
		        keypad.key_sta[i].is_pressed_long,
		        keypad.key_sta[i].long_pressed_timer);
	}

	if(key_idx<MAX_KEY_NUM)
	{
		if(keypad.key_sta[key_idx].adc_chg_cnt>0)
		{
			keypad.key_sta[key_idx].is_pressed = 1;
			keypad.key_sta[key_idx].down_timer = 9;   //°´¼üɨÃèÖÜÆÚ112ms£¬112*9ԼΪ1008ms
			keypad.key_sta[key_idx].adc_chg_cnt  = 0;
			keypad.lock = 1;

			keypad.key_sta[key_idx].adc_val_pre = keypad.key_sta[key_idx].adc_val_now;
		}
	}
}