行列扫描，线翻转
12MHZ
#include "reg52.h"
typedef unsigned int u16;
typedef unsigned char u8;
#define KEY_MATRIX_PORTP1
#define SMG_A_DP_PORTP0
u8 gsmg_code[17]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,
0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void delay_10us(u16 ten_us)
{
while(ten_us--);
}
u8 key_matrix_ranks_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=0xfb;
if(KEY_MATRIX_PORT!=0xfb)
{
delay_10us(1000);
switch(KEY_MATRIX_PORT)
{
case 0x7b: key_value=2;break;
case 0xbb: key_value=6;break;
case 0xdb: key_value=10;break;
case 0xeb: key_value=14;break;
}
}
while(KEY_MATRIX_PORT!=0xfb);
KEY_MATRIX_PORT=0xfd;
if(KEY_MATRIX_PORT!=0xfd)
{
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!=0xfe)
{
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!=0xfe);
return key_value;
}
u8 key_matrix_flip_scan(void)
{
static u8 key_value=0;
KEY_MATRIX_PORT=0x0f;
if(KEY_MATRIX_PORT!=0x0f)
{
delay_10us(1000);
if(KEY_MATRIX_PORT!=0x0f)
{
KEY_MATRIX_PORT=0x0f;
switch(KEY_MATRIX_PORT)
{
case 0x07: key_value=1;break;
case 0x0b: key_value=2;break;
case 0x0d: key_value=3;break;
case 0x0e: key_value=4;break;
}
KEY_MATRIX_PORT=0xf0;
switch(KEY_MATRIX_PORT)
{
case 0x70: key_value=key_value;break;
case 0xb0: key_value=key_value+4;break;
case 0xd0: key_value=key_value+8;break;
case 0xe0: key_value=key_value+12;break;
}
while(KEY_MATRIX_PORT!=0xf0);
}
}
else
key_value=0;
return key_value;
}
void main()
{
u8 key=0;
while(1)
{
key=key_matrix_ranks_scan();
if(key!=0)
SMG_A_DP_PORT=gsmg_code[key-1];
}
}