Příklady s časovým zpožděním v C pro 8051

zdroj informací: http://what-when-how.com/8051-microcontroller/data-types-and-time-delay-in-8051-c/

Unsigned char

example 7-1

#include <reg51.h>

void main (void)

{
	unsigned char z;
	for (z=0;z<=255;z++)
	P1=z;
}

example 7-2

#include <reg51.h>

void main (void)

{
	unsigned char mynum [] = "012345ABCD";
	unsigned char z;

	for (z=0;z<=10;z++)
	P1 = mynum[z];
	
}

example 7-3

#include <reg51.h>

void main (void)

{

for (;;)   //opakovani cyklu
	
	
	P1=0x55; 
	P1=0xAA; 
	
}

Unsigned char

example 7-4

#include <reg51.h>

void main (void)

{

	char mynum [] = {+1,-1,+2,-2,+3,-3,+4,-4};
	unsigned char z;

	for (z=0;z<=8;z++)
	P1 = mynum[z];
	
}

example 7-5

#include <reg51.h>
 
sbit MYBIT = P1^0; //definování výstupního bitu

void main (void)

{
  	 MYBIT = 0;
	 MYBIT = 1;

}

example 7-5-2

#include <reg51.h>
 
sbit MYBIT = P1^0; //definování výstupního bitu

void main (void)

{
  	 MYBIT = ~MYBIT;
}

example 7-5-3

#include <reg51.h>
 
sbit MYBIT = P1^0; //definování výstupního bitu

void main (void)

{
	unsigned int z;
	for (z=0;z<=5;z++)
	{
  	 MYBIT = 0;
  	 MYBIT = 1;
   }
}

</source>

example 7-6 (neověřeno)

#include <reg51.h>
 
void main (void)

{
	unsigned int x;
	for (;;)                //repeat forever
	{
  	 P1=0x55;
  	 for(x=0;x<40000;x++); //delay size unknown
         P1=0xAA;
         for(x=0;x<40000;x++);
   }
}

example 7-7 (neověřeno)

#include <reg51.h>
void MSDelay(unsigned int);
void main (void)
  {
    while(1)   //opakování cyklu
     {
	P1=0x55;
	MSDelay(250);
        P1=0xAA;
        MSDelay(250);
      }
    }
  Void MSDelay(unsigned int itime)
    {
     unsigned int i, j;
     for(i=0;i<itime;i++)
        for(j=0;j<1275;j++);
    }

example 7-8 (neověřeno)

#include <reg51.h>
void MSDelay(unsigned int);
void main (void)
  {
    while(1)   //another way to do it forever
     {
	P0=0x55;
	P2=0x55;
        MSDelay(250);
        P0=0xAA;
        P2=0xAA
        MSDelay(250);
      }
    }
  Void MSDelay(unsigned int itime)
    {
     unsigned int i, j;
     for(i=0;i<itime;i++)
        for(j=0;j<1275;j++);
    }

example 7-9 (neověřeno)

#include <reg51.h>
#definice LED P2    //notice how we can define P2
void main (void)
  {
    P1=00;         //clear P1
    LED=0;         //clear P2
    for(;;)        //Repeat forever
     {
        P1++;      //increment P1
        LED++;     //increment P2
      }
    }

example 7-10 (neověřeno)

#include <reg51.h>
void MSDelay (unsigned int);
void main (void)
  {
    unsigned char mybyte;
    P1=0xFF;             //make P1 an input port
    while(1)
     {
        mybyte=P1;       //get a byte from P1
        MSDelay(500);
        P2=mybyte;       //send it to P2
      }
    }
void MSDelay(unsigned int itime)
  {
    unsigned int i, j;
    for i=0,i<itime;i++}
     for(j=0;j<1275,jj++);
  }

example 7-11 (neověřeno)

#include <reg51.h>
void main (void)
  {
    unsigned char mybyte;
    P0=0xFF;               //make P0 an input port
    while(1)
     {
        mybyte=P0;        //get a byte from P0
        if(mybyte<100)
           P1=mybyte;    //send it to P1 if less than 100
        else 
           P2=mybyte;    //send iu to P2 if more than 100

      }
    }

example 7-12 (neověřeno)

<source lang"asm"> //toggling an individal bit

1. include <reg51.h>

sbit mybit = P2^4; //notice the way single bit is declared void main (void)

 {
   unsigned char mybyte;
   P0=0xFF;               //make P0 an input port
   while(1)
    {
       mybyte=P0;        //get a byte from P0
       if(mybyte<100)
          P1=mybyte;    //send it to P1 if less than 100
       else 
          P2=mybyte;    //send iu to P2 if more than 100

     }
   }