为什么按键什么反应都没有呀
#include "reg52.h"#define SMG_A_DP_PORT P0
#define KEY_MATRIX_PORT P1
typedef unsigned char u8;
typedef unsigned int u16;
void delay_10us(u16 ten_us) //延时函数
{
while(ten_us--);
}
u8 gsmg_code={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
u8 key_matrix_rank_scan(void)
{
u8 key_value=0;
KEY_MATRIX_PORT=0xf7;
if(KEY_MATRIX_PORT!=0xf7){
delay_10us(1000);
switch(KEY_MATRIX_PORT){
case 0x77: key_value=1;break;
case 0xb7: key_value=5;break;
case 0xd7: key_value=9;break;
case 0xe7: key_value=13;break;
}
}
while(KEY_MATRIX_PORT!=0xf7);
KEY_MATRIX_PORT=0xfc;
if(KEY_MATRIX_PORT!=0xfc){
delay_10us(1000);
switch(KEY_MATRIX_PORT){
case 0x7c: key_value=2;break;
case 0xbc: key_value=6;break;
case 0xdc: key_value=10;break;
case 0xec: key_value=14;break;
}
}
while(KEY_MATRIX_PORT!=0xfc);
KEY_MATRIX_PORT=0xfd;
if(KEY_MATRIX_PORT!=0xf7){
delay_10us(1000);
switch(KEY_MATRIX_PORT){
case 0x7d: key_value=3;break;
case 0xbd: key_value=7;break;
case 0xdd: key_value=11;break;
case 0xed: key_value=15;break;
}
}
while(KEY_MATRIX_PORT!=0xfd);
KEY_MATRIX_PORT=0xfe;
if(KEY_MATRIX_PORT!=0xf7){
delay_10us(1000);
switch(KEY_MATRIX_PORT){
case 0x7e: key_value=4;break;
case 0xbe: key_value=8;break;
case 0xde: key_value=12;break;
case 0xee: key_value=16;break;
}
}
while(KEY_MATRIX_PORT!=0xf7);
return key_value;
}
void main()
{ u8 key=0;
while(1){
key=key_matrix_rank_scan();
if(key!=0){
SMG_A_DP_PORT=gsmg_code;
}
}
}
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