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Code này là quét theo hàng hay cột vậy các bạn?
Nhân đây cho mình hỏi, bạn nào hiểu về nguyên lý quét theo hàng - theo cột trong matrix giải thích dùm mình với. Cảm ơn!!!
Code:
#include <REGX51.H>
sbit DATA = P1^0; //chan xung dich tung bit
sbit SH_CP = P1^1; //chan du lieu
sbit ST_CP = P1^2; //Chan chot du lieu
unsigned char code hang[]=
{
//CHUYEN QUA MUC TICH CUC 1 (1 sang 0 tat)
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, //KHOANG TRONG tat het
0x0,0x0,0x3C,0x3C,0x81,0xC3,0xFF,0xC3,0x81,0x3C,0x3C,0x81,0xC3,0xFF,0xFF,0xFF, //DO
0x3,0x1,0xE4,0xE4,0x1,0x3,0xFF,0x0,0x0,0xF3,0xE7,0x0,0x0,0xFF,0xFF,0xFF, //AN
};
unsigned int cot[8]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80};
unsigned int n,m,k;
void delay(unsigned int s)
{
unsigned int i;
for(i=0;i<s;i++);
}
void convert(unsigned char x)
{
unsigned char i;
for(i=0;i<=7;i++)
{
DATA=x&0x80; //lay bit du lieu dau tien la bit D7
x=x<<1;
SH_CP=0;
SH_CP=1;
}
}
//-------------- xóa ma tr?n -------------
void xoa()
{
convert(0xff);
convert(0xff);
convert(0xff);
convert(0xff);
}
void main()
{
while(1)
{
for(m=0;m<320;m++)//do dai chu
{
for(k=0;k<4;k++)//toc do chay chu
{
for(n=m;n<=7+m;n++)
{
convert(hang[n]);
if(n<8)convert(0xff); else convert(hang[n-8]);
if(n<16)convert(0xff); else convert(hang[n-16]);
if(n<24)convert(0xff); else convert(hang[n-24]);
P2=cot[n-m];
ST_CP=1;
ST_CP=0;
delay(200);
xoa();
}
}
}
}
}
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