www.pudn.com > armexamples.rar > keyboard.c

#include  
#include "2410addr.h" 
#include "2410lib.h" 
#include "timer.h" 
#include "interrupt.h" 
 
 
#define RECV_CMD_MAX_BUF 2048 
char recv_buf[RECV_CMD_MAX_BUF]; 
int  recv_read = 0; 
int  recv_write = 0; 
 
char key_recv_buf[RECV_CMD_MAX_BUF]; 
int  key_recv_read = 0; 
int  key_recv_write = 0; 
 
// 键盘扫描 
int  timer1_count = 0; 
enum KEYBOARD_SCAN_STATUS 
{ 
	KEYBOARD_SCAN_FIRST, 
	KEYBOARD_SCAN_SECOND, 
	KEYBOARD_SCAN_THIRD, 
	KEYBOARD_SCAN_FOURTH 
}; 
int row = 0; 
extern unsigned char output_0x10000000; 
unsigned char 	ascii_key, input_key[4], input_key1[4], key_mask = 0x0F; 
unsigned char*	keyboard_port_scan = (unsigned char*)0x10000000; 
unsigned char*	keyboard_port_value = (unsigned char*)0x10000002; 
int              keyboard_scan_status[4] = { 
														KEYBOARD_SCAN_FIRST, 
														KEYBOARD_SCAN_FIRST, 
														KEYBOARD_SCAN_FIRST, 
														KEYBOARD_SCAN_FIRST 
													  }; 
 
char key_get_char(int row, int col) 
{ 
	char key = 0; 
	 
	switch( row ) 
	{ 
	case 0: 
		if((col & 0x01) == 0) key = '0';  
		else if((col & 0x02) == 0) key = 'A';  
		else if((col & 0x04) == 0) key = 'B';  
		else if((col & 0x08) == 0) key = 'F';  
		break; 
	case 1: 
		if((col & 0x01) == 0) key = '7';  
		else if((col & 0x02) == 0) key = '8';  
		else if((col & 0x04) == 0) key = '9'; 
		else if((col & 0x08) == 0) key = 'E'; 
		break; 
	case 2: 
		if((col & 0x01) == 0) key = '4';  
		else if((col & 0x02) == 0) key = '5';  
		else if((col & 0x04) == 0) key = '6';  
		else if((col & 0x08) == 0) key = 'D';  
		break; 
	case 3: 
		if((col & 0x01) == 0) key = '1';  
		else if((col & 0x02) == 0) key = '2';  
		else if((col & 0x04) == 0) key = '3';  
		else if((col & 0x08) == 0) key = 'C';  
		break; 
	default: 
		break; 
	} 
	 
	return key; 
} 
/******************************************************************** 
// Function name	: recv_key 
// Description	    : 将获取的键值加入按键缓冲区 
// Return type		: void 
// Argument         : int key 
*********************************************************************/ 
void recv_key(int key) 
{ 
	key_recv_buf[key_recv_write] = key; 
	key_recv_write ++; 
	if(key_recv_write >= RECV_CMD_MAX_BUF) 
		key_recv_write = 0; 
		 
	if(key_recv_write == key_recv_read) 
	{ 
		// 缓冲区以满 
		key_recv_read ++; 
		if(key_recv_read >= RECV_CMD_MAX_BUF) 
			key_recv_read = 0; 
	} 
} 
/******************************************************************** 
// Function name	: Kbd_Scan 
// Description	    : 定时器1中断服务程序，用于扫描键盘，每隔10ms一次中断 
// Return type		: void 
// Argument         : void 
*********************************************************************/ 
void Kbd_Scan(void) 
{ 
	int loopcnt = row, bexit = 0; 
	int temp; 
 
	// 键盘扫描 
	for( loopcnt = row; loopcnt < row + 4; loopcnt ++) 
	{ 
		if(loopcnt >= 4) 
			temp = loopcnt - 4; 
		else 
			temp = loopcnt; 
		switch(keyboard_scan_status[temp]) 
		{ 
			case KEYBOARD_SCAN_FIRST: 
				*keyboard_port_scan = output_0x10000000 & (~(0x00000001<= RECV_CMD_MAX_BUF) 
			key_recv_read = 0; 
	} 
	return ch; 
} 
 
/******************************************************************** 
// Function name	: Key_GetKeyPoll(查询方式) 
// Description	    : 如果有键按下返回键，否则返回0 
// Return type		: char 
// Argument         :  
*********************************************************************/ 
char Key_GetKeyPoll() 
{ 
	int row; 
	unsigned char 	ascii_key, input_key, input_key1, key_mask = 0x0F; 
	 
	for( row = 0; row < 4; row++) 
	{ 
		*keyboard_port_scan = output_0x10000000 & (~(0x00000001<