程序是<嵌入式系统结构>中通用可移植的矩阵键盘程序，代码如下：
/*
*********************************************************************************************************
* Embedded Systems Building Blocks
* Complete and Ready-to-Use Modules in C
*
* Matrix Keyboard Driver
*
* (c) Copyright 1999, Jean J. Labrosse, Weston, FL
* All Rights Reserved
*
* Filename : KEY.H
* Programmer : Jean J. Labrosse
*********************************************************************************************************
* USER DEFINED CONSTANTS
*
* Note: These #defines would normally reside in your application specific code.
*********************************************************************************************************
*/
#ifndef CFG_H
#define KEY_BUF_SIZE 10 /* Size of the KEYBOARD buffer */
#define KEY_PORT_ROW 0x0312 /* The port address of the keyboard matrix ROWs */
#define KEY_PORT_COL 0x0311 /* The port address of the keyboard matrix COLUMNs */
#define KEY_PORT_CW 0x0313 /* The port address of the I/O ports control word */
#define KEY_MAX_ROWS 4 /* The maximum number of rows on the keyboard */
#define KEY_MAX_COLS 6 /* The maximum number of columns on the keyboard */
#define KEY_RPT_DLY 2 /* Number of scan times before auto repeat executes again */
#define KEY_RPT_START_DLY 10 /* Number of scan times before auto repeat function engages*/
#define KEY_SCAN_TASK_DLY 50 /* Number of milliseconds between keyboard scans */
#define KEY_SCAN_TASK_PRIO 50 /* Set priority of keyboard scan task */
#define KEY_SCAN_TASK_STK_SIZE 1024 /* Size of keyboard scan task stack */
#define KEY_SHIFT1_MSK 0x80 /* The SHIFT1 key is on bit B7 of the column input port */
/* (A 0x00 indicates that a SHIFT1 key is not present) */
#define KEY_SHIFT1_OFFSET 24 /* The scan code offset to add when SHIFT1 is pressed */
#define KEY_SHIFT2_MSK 0x40 /* The SHIFT2 key is on bit B6 of the column input port */
/* (A 0x00 indicates that an SHIFT2 key is not present)*/
#define KEY_SHIFT2_OFFSET 48 /* The scan code offset to add when SHIFT2 is pressed */
#define KEY_SHIFT3_MSK 0x00 /* The SHIFT3 key is on bit B5 of the column input port */
/* (A 0x00 indicates that a SHIFT3 key is not present) */
#define KEY_SHIFT3_OFFSET 0 /* The scan code offset to add when SHIFT3 is pressed */
#endif
#define KEY_ALL_ROWS 0xFF /* Select all rows (i.e. all rows LOW) */
/*
*********************************************************************************************************
* FUNCTION PROTOTYPES
*********************************************************************************************************
*/
void KeyFlush(void); /* Flush the keyboard buffer */
INT8U KeyGetKey(INT16U to); /* Get a key scan code from driver if one is present, -1 else */
INT32U KeyGetKeyDownTime(void); /* Get how long key has been pressed (in milliseconds) */
BOOLEAN KeyHit(void); /* See if a key has been pressed (TRUE if so, FALSE if not) */
void KeyInit(void); /* Initialize the keyboard handler */
void KeyInitPort(void); /* Initialize I/O ports */
INT8U KeyGetCol(void); /* Read COLUMNs */
void KeySelRow(INT8U row); /* Select a ROW */
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