矩阵式键盘的控制程序.doc

矩阵式键盘的控制程序/-函数声明，变量定义-#includereg52.h#define KEY P1/-变量声明-void program_SCANkey(); /程序扫描键盘，供主程序调用void delay(unsigned intN); /延时子程序，实现（16*N+24)us的延时 bit judge_hitkey(); /判断是否有键按下，有返回1，没有返回0unsigned char scan_key(); /扫描键盘，返回键值void key_manage(unsigned char keycode);/键盘散转void manage_key1(void); /按键1处理程序void manage_key2(void); /按键2处理程序void manage_key3(void); /按键3处理程序void manage_key4(void); /按键4处理程序 void manage_key5(void);void manage_key6(void);void manage_key7(void);void manage_key8(void);void manage_key9(void);void manage_key10(void);void manage_key11(void);void manage_key12(void);void manage_key13(void);void manage_key14(void);void manage_key15(void);void manage_key16(void);/-/函数名称：judge_hitkey/ 函数功能：判断是否有键按下，有返回1，没有返回0/-bit udge_hitkey() /判断是否有键按下，有返回1，没有返回0unsigned char scancode,keycode;scancode=0x0F; /P1.4P1.7输出全1则无键闭合KEY=scancode;keycode=KEY; / 读P1.0P1.3的状态if(keycode=0x0F)return(0); /全1则无键闭合elsereturn(1); /否则有键闭合 /-/函数名称: scan_key/函数功能: 扫描键盘，返回键值（高4位代表行，低4位代表列）/-unsigned char scan_key() /扫描键盘，返回键值（高4位代表行，低4位代表列?unsigned char scancode,keycode;scancode=0xef; /键盘扫描码，采用逐行扫描的方法while(scancode!=0xff)KEY=scancode; /输入扫描码 ，扫描P1.4对应的行keycode=KEY; /读出数据，看是否在此行上的某列键盘被按下if(keycode&0x0f)!=0x0f)break; /扫描到按下的键，则退出scancode=(keycode1)|0x0f; /否则，更新扫描码继续扫描keycode=keycode;return(keycode);/-/函数名称：key_manage/入口参数：keycode 扫描键盘返回的键值（高4位代表行，低4位代表列）/函数功能：键盘散转/-void key_manage(unsigned char keycode)switch(keycode)case 0x11:manage_key1();break;case 0x12:manage_key2();break;case 0x14:manage_key3();break;case 0x18:manage_key4();break;case 0x21:manage_key5();break;case 0x22:manage_key6();break;case 0x24:manage_key7();break;case 0x28:manage_key8();break;case 0x41:manage_key9();break;case 0x42:manage_key10();break;case 0x44:manage_key11();break;case 0x48:manage_key12();break;case 0x81:manage_key13();break;case 0x82:manage_key14();break;case 0x84:manage_key15();break;case 0x88:manage_key16();break;/default:/-/函数名称：manage_key/函数功能：按键处理程序/-void manage_key1(void) void manage_key2(void)void manage_key3(void) void manage_key4(void) void manage_key5(void)void manage_key6(void)void manage_key7(void)void manage_key8(void)void manage_key9(void)void manage_key10(void)void manage_key11(void)void manage_key12(void)void manage_key13(void)void manage_key14(void)void manage_key15(void)void manage_key16(void)/-每个按键对应一个处理程序-/-/函数名称：program_SCANkey/函数功能：程序扫描键盘，/有键按下完成按键处理，无键按下直接返回/-void program_SCANkey() unsigned char key_code;if(judge_hitkey() /判断是否有键按下delay(1000); /延时20ms左右，消除抖动的干扰 if(judge_hitkey() /判断是否有效按键 key_code=scan_key();while(judge_hitkey(); /等待安检释放key_manage(key_code); /键盘扫描，键盘散转，按键处理 /-/函数名称：delay/入口参数：N