c51编写的TIMER定时4*4键盘

ID:243177 · 发表于 2017-10-26 17:13

上实验课写的代码，附件里有c15的代码，proteus仿真图，自己写的。有错请指出。

#include <reg52.H>
#define uint unsigned int
#define uchar unsigned char
int i=0;
char disp_buff [] ={0, 0, 0, 0};
uchar code table[16] = {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
uchar flag = 0;
void setTimer0()
{
TMOD|=0X01;
EA=1;
ET0=1;
TH0=0XFC;
TL0=0X18;
}
void Timer0() interrupt 1
{
TH0=0XFC;
TL0=0X18;
flag = 1;
}
void display(void)
{
char code wei[] = {8, 4, 2, 1};//Î»Ñ¡′úÂë
char i;
for (i = 0; i < 4; i++)
{
TR0 = 1;
while(!flag){
P0 = table[disp_buff [i]];
P2 = ~wei[i];}
if(flag){
TR0 = 0;
flag = 0; }
P0 = 0XFF;
}
}
uchar Keyscan(void)
{
uchar i, j, temp, Buffer[4] = {0xef, 0xdf, 0xbf, 0x7f};
for(j = 0; j < 4; j++) { //Ñ-»·ËÄ′Î
P1 = Buffer[j]; //ÔúP1¸ßËÄÎ»·Ö±eêä3öò»¸öμíμçÆ½
temp = 0x01; //¼Æ»®ÏèÅD¶ÏP1.0Î»
for(i = 0; i < 4; i++) { //Ñ-»·ËÄ′Î
if(!(P1 & temp)) //′óP1μíËÄÎ»￡¬½Øè¡1Î»
return (i + j * 4); //·μ»Øè¡μÃμÄ°′¼üÖμ
temp <<= 1; //ÅD¶ÏμÄÎ»￡¬×óòÆò»Î»
} }
return 16; }
void main(void)
{
unsigned char i, key;
setTimer0();
while(1) { //ÎTÏTÑ-»·
display(); //ÏÔê¾ò»±é
key = Keyscan(); //¶á3öò»±é¼üÅì
if (key < 16) { //èç1ûóDèË°′¼ü
//--------------------½øDD°′¼ü′|àí
disp_buff [3] = disp_buff [2];
disp_buff [2] = disp_buff [1];
disp_buff [1] = disp_buff [0];
disp_buff [0] = key;
//--------------------′|àí½áêø￡¬è￥μè′y°′¼üêí·Å
for (i = 0; i < 20; i++) display(); //Ëé¿aÏû¶¶
while(key != 16) {
key = Keyscan();
display();
} } }
}

复制代码

ID:275169 · 发表于 2018-1-12 17:43

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