51 single chip microcomputer button control pattern light-EEWORLD

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/********************************************************
* This program uses buttons to control pattern lights. *
* When K1 is pressed, the light runs from 0xfe to the left; *
* When K2 is pressed, the LED light runs from 0x7f to the right, reaches 0xfe and runs right back to the starting position; *
* When the K3 key is pressed, the LED light runs once from 0xfe in a running light pattern, and then flows back. *
* When the K4 key is pressed, the first four LED lights light up first, and then turn to light up the last four. *
* When the K5 key is pressed, any ongoing program ends and all LED lights go out. *
**********************************************************/
**************************************************
Connection method: P0 connects to independent button JP5; P2 connects to LED light interface JP1 *
***********************************************************/
#include //Header file, function declaration
#include

//Define the button position
sbit K1=P0^0;
sbit K2=P0^1;
sbit K3=P0^2;
sbit K4=P0^3;
sbit K5=P0^4;
unsigned char led;
unsigned char j;

void delayms(unsigned char ms) // 1ms standard delay
{
while(ms--)
{
for(j=0;j<110;j++); //It is still impossible to set a more standard delay, such as 1S; so the timer delay should be used for the most accurate timer
}
}

void main()
{ //P2=led;
unsigned int i;

while(1)
{

/*************************************************
* When K1 is pressed, the light runs from 0xfe to the left; *
*********************************************/
if(K1==0)
delayms(10); //Eliminate keyboard jitterif
(K1==0)
{
led=0xfe;
for(i=0;i<7;i++) //i can be a multiple of 8, indicating how many times this circuit is executed
{
//led=0x7f; // The initial definition of port P should be outside the loop, otherwise the effect will be messed up
P2=led; //Because a light has been initially set here, this
delayms(100) should be added to for; //Initially, 500MS is set here, so that the light color will move one each time the key is pressed, which cannot meet the requirements.
led=_crol_(led,1);

P2=led;
delayms(100);

}
while(!K1); //Here it is emphasized that if you release the button, the program will not be executed again.
P2=led; //Indicates the final state after executing the above program
. } //P2=led; // If this line is placed here, although it is not stated in the beginning that a light will be displayed after the program is burned, since this line is outside the if, it will still be displayed in the end.

/***************************************************************
*When K2 is pressed, the LED light runs from 0x7f to the right to 0xfe and then runs back to the starting position. *
***************************************************************/

if(K2==0)
delayms(10);
if(K2==0)
{
led=0x7f;
for(i=0;i<7;i++)
{
P2=led;
delayms(100);
led=_cror_(led,1);

P2=led;
delayms(100);

}
while(!K1);
P2=led;
delayms(100);
for(i=0;i<7;i++)
{
led=_crol_(led,1);

P2=led;
delayms(100); //How come it runs back so fast?
} //At this time led=0x7f

}
/************************************************************
*When the K3 key is pressed, the LED light starts from 0xfe and runs in a running light mode, and then flows back. *
*************************************************/
if(K3==0)
delayms(10); //eliminate jitterif
(K3==0)
{
led=0xfe;
delayms(200);
for(i=0;i<7;i++)
{
P2=led;
delayms(200);
led=led<<1; // Note led=_crol_(led,1）is equal to led<<1||led>>7;

P2=led;
delayms(200);

if(led==0x00)
break; //There must be a break here to jump out of the loop, and don't forget that the state at this time is 00, not 7f
}
while(!K1);

led=0x7f;
P2=led;
delayms(200 );
for(i=0;i<7;i++)
{
led=led>>1;

P2=led;
delayms(200);
}

}

/********************************************************
*When the K4 key is pressed, the first four LEDs light up first, and then turn to the last four. *
****************************************************/
if(K4==0)
delayms(10); //eliminate jitterif
(K4==0)
{
for(i=0;i<4;i++) //Execute four times
{ led=0xf0;
P2=led;
delayms(500);
led=0x0f;
P2=led;
delayms(500);
}
}

/************************************************************
*When the K5 key is pressed, end any ongoing program and turn off all LEDs. *
********************************************************/
if(K5==0)
delayms(10);
if(K5==0)
P2=0xff;

}
}

/**** */

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