新手_矩阵键盘例程.doc

/* 两个程序均为有效，第一个程序放开按钮后值归0；第二个程序放开按钮后值仍不变*/*#include void delay (unsigned int i);unsigned char code table =0xF9,0xA4,0xB0,0x99;void main (void)unsigned char temp,num = 2;P0 = 0xc0;while (1)P1 = 0xfe;delay(5);temp = P1;while (temp != 0xfe)delay(5);temp = P1;while (temp != 0xfe)switch(temp)case 0xEE:num = 1;P0 = tablenum - 1;break;case 0xde:num = 2;P0 = tablenum - 1;break;case 0xbe:num = 3;P0 = tablenum - 1;break;case 0x7e:num = 4;P0 = tablenum - 1;break;P1 = 0xfe;temp = P1;delay(1);P0 = 0xc0;void delay (unsigned int i)int a,b;for (a = 0;a = i;a +)for (b = 0;b = 901;b+);*/#include void delay (unsigned int i);unsigned char code table =0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e;void main (void)unsigned char temp,num = 2;while (1)P1 = 0xfe;delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)temp = temp 4 | 0x00;switch(temp)case 0x01:num = 1;break;case 0x02:num = 2;break;case 0x04:num = 3;break;case 0x08:num = 4;break;P0 = tablenum - 1;temp = 0xf0;P1 = 0xfd;delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)temp = temp 4 | 0x00;switch(temp)case 0x01:num = 5;break;case 0x02:num = 6;break;case 0x04:num = 7;break;case 0x08:num = 8;break;P0 = tablenum - 1;temp = 0xf0;P1 = 0xfb;delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)temp = temp 4 | 0x00;switch(temp)case 0x01:num = 9;break;case 0x02:num = 10;break;case 0x04:num = 11;break;case 0x08:num = 12;break;P0 = tablenum - 1;temp = 0xf0;P1 = 0xf7;delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)delay(2);temp = P1;temp = temp & 0xf0; while (temp != 0xf0)temp = temp 4 | 0x00;switch(temp)case 0x01:num = 13;break;case 0x02:num = 14;break;case 0x04:num = 15;break;case 0x08:num = 16;break;P0 = tabl