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//4X4键盘扫描程序 keyboard4x4.h
#include <iom88v.h>
#include <macros.h>
//行线、列线引脚定义
#define keyboard_line_column_1 BIT(PC0) //行线1
#define keyboard_line_column_2 BIT(PC1) //行线2
#define keyboard_line_column_3 BIT(PC2) //行线3
#define keyboard_line_column_4 BIT(PC3) //行线4
#define keyboard_line_column_1_ioport C //行线1
#define keyboard_line_column_2_ioport C //行线2
#define keyboard_line_column_3_ioport C //行线3
#define keyboard_line_column_4_ioport C //行线4
#define keyboard_line_row_1 BIT(PC4) //列线1
#define keyboard_line_row_2 BIT(PC5) //列线2
#define keyboard_line_row_3 BIT(PD1) //列线3
#define keyboard_line_row_4 BIT(PD0) //列线4
#define keyboard_line_row_1_ioport C //列线1
#define keyboard_line_row_2_ioport C //列线2
#define keyboard_line_row_3_ioport D //列线3
#define keyboard_line_row_4_ioport D //列线4
//按键编码：
//bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
//第4行 第3行 第2行 第1行 第4列 第3列 第2列 第1列
//0: 表示该行（列）没有按键按下；1：表示该行（列）有按键按下
unsigned char keyboard_scan(void); //键盘扫描，返回按键编码
//按键解码：
//////////////////////////////////
//第1行 1 2 3 A //
//第2行 4 5 6 B //
//第3行 7 8 9 C //
//第4行 * 0 # D //
// 第1列 第2列 第3列 第4列 //
//////////////////////////////////
unsigned char keyboard_decode(unsigned char keyboard_code);
//4X4键盘扫描程序 keyboard4x4.c
#include "keyboard4x4.h"
//双定义连接宏定义的字符串
#ifndef STRINGS_DEFINED_BY_MACROS_CONNECT
#define STRINGS_DEFINED_BY_MACROS_CONNECT
#define STR_CONNECT(a, b) a ## b //连接字符串
#define PORT(x) STR_CONNECT(PORT, x)
#define PIN(x) STR_CONNECT(PIN, x)
#define DDR(x) STR_CONNECT(DDR, x)
#endif
void keyboard_init_column_out_row_in(void) //行输出低电平，列上拉输入
{
//行输出低电平
PORT(keyboard_line_column_1_ioport) &= ~keyboard_line_column_1;
DDR(keyboard_line_column_1_ioport) |= keyboard_line_column_1;
PORT(keyboard_line_column_2_ioport) &= ~keyboard_line_column_2;
DDR(keyboard_line_column_2_ioport) |= keyboard_line_column_2;
PORT(keyboard_line_column_3_ioport) &= ~keyboard_line_column_3;
DDR(keyboard_line_column_3_ioport) |= keyboard_line_column_3;
PORT(keyboard_line_column_4_ioport) &= ~keyboard_line_column_4;
DDR(keyboard_line_column_4_ioport) |= keyboard_line_column_4;
//列上拉输入
PORT(keyboard_line_row_1_ioport) |= keyboard_line_row_1;
DDR(keyboard_line_row_1_ioport) &= ~keyboard_line_row_1;
PORT(keyboard_line_row_2_ioport) |= keyboard_line_row_2;
DDR(keyboard_line_row_2_ioport) &= ~keyboard_line_row_2;
PORT(keyboard_line_row_3_ioport) |= keyboard_line_row_3;
DDR(keyboard_line_row_3_ioport) &= ~keyboard_line_row_3;
PORT(keyboard_line_row_4_ioport) |= keyboard_line_row_4;
DDR(keyboard_line_row_4_ioport) &= ~keyboard_line_row_4;
}
void keyboard_init_row_out_column_in(void) //列输出低电平，行上拉输入
{
//列输出低电平
PORT(keyboard_line_row_1_ioport) &= ~keyboard_line_row_1;
DDR(keyboard_line_row_1_ioport) |= keyboard_line_row_1;
PORT(keyboard_line_row_2_ioport) &= ~keyboard_line_row_2;
DDR(keyboard_line_row_2_ioport) |= keyboard_line_row_2;
PORT(keyboard_line_row_3_ioport) &= ~keyboard_line_row_3;
DDR(keyboard_line_row_3_ioport) |= keyboard_line_row_3;
PORT(keyboard_line_row_4_ioport) &= ~keyboard_line_row_4;
DDR(keyboard_line_row_4_ioport) |= keyboard_line_row_4;
//行上拉输入
PORT(keyboard_line_column_1_ioport) |= keyboard_line_column_1;
DDR(keyboard_line_column_1_ioport) &= ~keyboard_line_column_1;
PORT(keyboard_line_column_2_ioport) |= keyboard_line_column_2;
DDR(keyboard_line_column_2_ioport) &= ~keyboard_line_column_2;
PORT(keyboard_line_column_3_ioport) |= keyboard_line_column_3;
DDR(keyboard_line_column_3_ioport) &= ~keyboard_line_column_3;
PORT(keyboard_line_column_4_ioport) |= keyboard_line_column_4;
DDR(keyboard_line_column_4_ioport) &= ~keyboard_line_column_4;
}
unsigned char keyboard_read_line_row(void) //读列线信号
{
unsigned char row_code = 0;
if((PIN(keyboard_line_row_1_ioport) & keyboard_line_row_1) == 0) row_code |= BIT(0);
if((PIN(keyboard_line_row_2_ioport) & keyboard_line_row_2) == 0) row_code |= BIT(1);
if((PIN(keyboard_line_row_3_ioport) & keyboard_line_row_3) == 0) row_code |= BIT(2);
if((PIN(keyboard_line_row_4_ioport) & keyboard_line_row_4) == 0) row_code |= BIT(3);
return row_code;
}
unsigned char keyboard_read_line_column(void) //读行线信号
{
unsigned char column_code = 0;
if((PIN(keyboard_line_column_1_ioport) & keyboard_line_column_1) == 0) column_code |= BIT(4);
if((PIN(keyboard_line_column_2_ioport) & keyboard_line_column_2) == 0) column_code |= BIT(5);
if((PIN(keyboard_line_column_3_ioport) & keyboard_line_column_3) == 0) column_code |= BIT(6);
if((PIN(keyboard_line_column_4_ioport) & keyboard_line_column_4) == 0) column_code |= BIT(7);
return column_code;
}
//按键编码：
//bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
//第4行 第3行 第2行 第1行 第4列 第3列 第2列 第1列
//0: 表示该行（列）没有按键按下；1：表示该行（列）有按键按下
unsigned char keyboard_scan(void) //键盘扫描，返回按键编码
{
unsigned char keyboard_code = 0;
keyboard_init_column_out_row_in();
NOP();NOP();
keyboard_code = keyboard_read_line_row();
keyboard_init_row_out_column_in();
NOP();NOP();
keyboard_code |= keyboard_read_line_column();
return keyboard_code;
}
//按键解码：
//////////////////////////////////
//第1行 1 2 3 A //
//第2行 4 5 6 B //
//第3行 7 8 9 C //
//第4行 * 0 # D //
// 第1列 第2列 第3列 第4列 //
//////////////////////////////////
unsigned char keyboard_decode(unsigned char keyboard_code)
{
switch(keyboard_code)
{
case 0x11: return '1';
case 0x12: return '2';
case 0x14: return '3';
case 0x18: return 'A';
case 0x21: return '4';
case 0x22: return '5';
case 0x24: return '6';
case 0x28: return 'B';
case 0x41: return '7';
case 0x42: return '8';
case 0x44: return '9';
case 0x48: return 'C';
case 0x81: return '*';
case 0x82: return '0';
case 0x84: return '#';
case 0x88: return 'D';
default: return ' ';
}
} |
阿莫论坛20周年了！感谢大家的支持与爱护！！
知道什么是神吗？其实神本来也是人，只不过神做了人做不到的事情 所以才成了神。 （头文字D, 杜汶泽）
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发表于 2011-8-31 13:41:18
楼主
