Một Số Bài Toán Ứng Dụng Cho Trình biên dịch Keil C
pptx
1: chương trình ma trận 4x4 ra led P1, nút ấn P2
//PROJECT : DEM LED 7 DOAN
//FILE : VD1.c
//DATE : 24/02/2014
//PROCESSOR : AT89C51
//AUTHOR : HPT
//******************************************
#include <REGX51.H>
#define LOOP 10
unsigned char LED_ARRAY[16] =
{0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x77,0x7C,0x39,0x5E,0x79,0x71};
unsigned char KEY_MATRIX[4]={0xEF,0xDF,0xBF,0x7F}; //cho lan luot cac
hang bang 0 roi kiem tra cot
//KHAI BAO CAC HAM
char SCAN_KEY(void);
void DISPLAY(unsigned char key);
void delay(unsigned int time);
//NOI DUNG CAC HAM
char SCAN_KEY(void)
{
unsigned char KEY_NUM; //bien tra ve gia tri ban phim tu 0-15
unsigned char x,y; //2 bien quet hang va cot
for(x=0;x<4;x++)
{
P2=KEY_MATRIX[x];
for(y=0;y<LOOP;y++)
{
if(P2_0==0) KEY_NUM=0+4*x;
if(P2_1==0) KEY_NUM=1+4*x;

{
unsigned int i;
for(i=0;i<time;i++)
{
;
}
}
/*KHAI BAO MANG QUET PHIM*/
//CT CHINH
void main(void)
{
unsigned char a;
while(1)
{
a=SCAN_KEY();
DISPLAY(a);
}
}
2: LED7 đoạn chạy từ 0-9, có 3 nút ấn P3_0 nút ấn lên, nút ấn P3_1 nút ấn xuống và nút ấn
P3_2 là RESET:
#include <REGX51.H>
#define ON 0
#define OFF 1
sbit TANG=P3^0;
sbit GIAM=P3^1;
sbit RESET=P3^2;
unsigned char DEM=0;
unsigned char LED_ARRAY [10]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
//KHAI BAO
void delay(unsigned int time);

DEM ;
}
;
{
if (RESET==0)
{
while(RESET==0);
delay(5000);
DEM=0;
}
}
}
}
// CHUONG TRINH CHINH
void main (void)
{
while(1)
{
read_key();
display();
}
}
3: LED7 đoạn có nút P3_0 đếm lên:
#include <REGX51.H>
#define ON 0
#define OFF 1
sbit BUTTON = P3^0;
unsigned char DEM=0;
unsigned char
LED_ARRAY[10]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};

{
read_key();
display();
}
}
4: 8LED sáng:
#include <REGX51.H>
void delay (unsigned int time)
{
unsigned int i;
for ( i=0; i<time; i++)
{
;
}
}
void main (void)
{
unsigned char LED=0x01;
while (1)
{
P2=~LED;
LED=LED<<1;
if(LED==0x00) LED=0x01;
delay (65000);
}
}