Tạo xung tăng giảm độ rộng khi nhấn nút

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// Write by Huu Quang

#include <REGX52.H>

#define tan_so 20

char millisec;

char do_rong_xung;

void delay_ms(unsigned int timer)

{

  int i,j;

for(i=0;i<timer;i++)

for(j=0;j<121;j++);

}

/*

void ISR_1000ms(void) interrupt 1 // ham ngat timer 0

{

TF0 = 0;//xoa co tran

TH0 =0xE2; // nap du lieu vao thanh ghi timer

TL0 =0x0A;

TR0=1;

    P2_1=~P2_1;

}

*/

int main()

{

 

TMOD=0x01;//timer 0 che do 16 bit

TR0=1;    //cho phep timer 0 hoat dong

TH0=(0xFFFF-50000)>>8;

TL0=(0xFFFF-50000)|0xFF;

while(1)

{

while(TF0!=0) 

{

millisec++;

TF0=0;

TH0 =(0xFFFF-50000)>>8; // nap du lieu vao thanh ghi timer

TL0 =(0xFFFF-50000);

if(millisec<=do_rong_xung)

{

P2_0=1;

}

else if(millisec<=tan_so)

{

P2_0=0;

}

else millisec=0;

}

if(P2_1==0)

{

while(P2_2==0);

delay_ms(100);

do_rong_xung+=1;

if(do_rong_xung>=tan_so)

do_rong_xung=1;

}

}

}

Tạo xung 1hz dùng timer

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#include<regx52.h>

sbit F=P2^0;

int dem;

void main()

{

TMOD=0x01;

// TH0=(65536-50000)/256;

// TL0=(65536-50000)%256;

//TR0=1;

while(1)

{

TH0=(65536-50000)/256;

TL0=(65536-50000)%256;

TR0=1;

while(!TF0);

TF0=0;

TR0=0;

dem++;

if(dem==10) 

{

F=~F;

dem=0;

}

}

}

Các hiệu hứng cho 8 LED đơn

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#include <REGX51.H>
unsigned int i,j;
void delay(unsigned int ms)
{
  for(i=0;i<=ms;i++);
}
void sang_thuan1()
{
  //unsigned char sang_thuan1[]={0x00,0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};
   unsigned int x=1;
  for(j=0;j<8;j++)
{

 P2=x;
 x=x<<1|1;
 delay(10000);
}
}
void sang_thuan2()
{
  unsigned char sang_thuan2[]={0x00,0x01,0x03,0x07,0x0f,0x1f,0x3f,0x7f,0xff};
  for(j=0;j<9;j++)
{
 P2=~sang_thuan2[j];
 delay(9000);
}
}
void sang_nghich1()
{
  unsigned char sang_nghich1[]={0x00,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
  for(j=0;j<9;j++)
{
 P2=sang_nghich1[j];
 delay(9000);
}
}
void sang_nghich2()
{
  unsigned char sang_nghich2[]={0x00,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff};
  for(j=0;j<9;j++)
{
 P2=~sang_nghich2[j];
 delay(9000);
}
}
void mot_led_duoi_thuan1()
{
  P2=0x01;delay(9000);
  for(j=0;j<9;j++)
{
 P2=P2<<1;
 delay(9000);
}
}
void mot_led_duoi_thuan2()
{
  P2=0x80;delay(9000);
  for(j=0;j<9;j++)
{
 P2=P2>>1;
 delay(9000);
}
}
void hai_led_duoi_nhau1()
{
  P2=0x03;delay(9000);
  for(j=0;j<9;j++)
{
 P2=P2<<1;
 delay(9000);
}
}
void hai_led_duoi_nhau2()
{

  P2=0xc0; delay(9000);
  for(j=0;j<9;j++)
{
 P2=P2>>1;
 delay(9000);
}
}
void nhap_nhay_5_lan()
{
  for(j=0;j<5;j++)
{
 delay(9000);
 P2=0x00;
 delay(9000);
 P2=0xff;
 delay(9000);
}
}
void quet_luu_sang1()
{
  unsigned char quet_luu_sang1[]={0x01,0x02,0x04,0x08,0x10,0x20,0x40,0x80,
                                                      0x81,0x82,0x84,0x88,0x90,0xa0,0xc0,
                                              0xc1,0xc2,0xc4,0xc8,0xd0,0xe0,
                                              0xe1,0xe2,0xe4,0xe8,0xf0,
                                              0xf1,0xf2,0xf4,0xf8,
                                              0xf9,0xfa,0xfc,
                                              0xfd,0xfe,0xff    };
  for(j=0;j<36;j++)
  {
  P2=quet_luu_sang1[j];
  delay(9000);
  }
}
void dich_bit()
{
  P2=0x07;delay(9000);
  for(j=0;j<9;j++)
  {
  P2=P2<<1; delay(9000);
  }
}
void chuyen_nhanh()
{
  for(j=0;j<10;j++)
  {
    P2=0x55; delay(9000);
P2=0xaa; delay(9000);
  }
}
void giua_chay_ra()
{
  unsigned char giua_chay_ra[]={0x00,0x18,0x24,0x42,0x81};
  for(j=0;j<5;j++)
{
 P2=giua_chay_ra[j];
 delay(9000);
}
}
void giua_chay_ra_luu()
{
   unsigned char giua_chay_ra_luu[]={0x00,0x18,0x24,0x42,0x81,0x99,0xa5,0xc3,0xdb,0xe7,0xff};
   for(j=0;j<11;j++)
{
 P2=giua_chay_ra_luu[j];
 delay(9000);
}
}
void hai_dau_chay_vao()
{
  unsigned char hai_dau_chay_vao[]={0x00,0x81,0x42,0x24,0x18};
  for(j=0;j<5;j++)
{
 P2=hai_dau_chay_vao[j];
 delay(9000);
}
}
void hai_dau_chay_vao_luu()
{
  unsigned char hai_dau_chay_vao_luu[]={0x00,0x81,0x42,0x24,0x18,0x99,0x5a,0x3c,0xbd,0x7e,0xff};
  for(j=0;j<11;j++)
{
 P2=hai_dau_chay_vao_luu[j];
 delay(9000);
}
}
void main()
{
  while(1)
  {
   sang_thuan1();
   sang_thuan2();
  sang_nghich1();
sang_nghich2();
   nhap_nhay_5_lan();
mot_led_duoi_thuan1();
mot_led_duoi_thuan2();
hai_led_duoi_nhau1();
hai_led_duoi_nhau2();
quet_luu_sang1();
dich_bit();
chuyen_nhanh();
giua_chay_ra();
giua_chay_ra_luu();
hai_dau_chay_vao();
hai_dau_chay_vao_luu();

  }
}