Simulation Design of AVR Single Chip Microcomputer Marquee

Simple marquee design.

The simulation schematic based on AVR microcontroller is as follows:

The microcontroller source program is as follows:

/********************************************************************

                            Huicheng Technology

*************************************************************************/

#include

/******************************************************************************

                                  Function data type description                                                                   

**************************************************************************/

#define uchar unsigned char 

#define uint unsigned int

/******************************************************************************

                                  MS level delay function program, parameter i delay time                                                                           

**************************************************************************/

void DelayMS(uint i)

{

uint j;

for(;i!=0;i--)

{

for(j=8000;j!=0;j--);

}

}

/******************************************************************************

                                  The marquee program lights up the corresponding LEDs based on the number of steps run.

                                  Low level turns on LED                                                                           

**************************************************************************/

void horse(uchar i)

{switch (i)

{

case 0:PORTA=0X00;break;//0000 0000B turns on LED1~LED8

case 1:PORTA=0X01;break;//0000 0001B turns on LED2~LED8

case 2:PORTA=0X03;break;//0000 0011B turns on LED3~LED8

case 3:PORTA=0X07;break;//0000 0111B turns on LED4~LED8

case 4:PORTA=0X0f;break;//0000 1111B turns on LED5~LED8

case 5:PORTA=0X1f;break;//0001 1111B turns on LED6~LED8

case 6:PORTA=0X3f;break;//0011 1111B turns on LED7~LED8

case 7:PORTA=0X7f;break;//0111 1111B turns on LED8

case 8:PORTA=0Xff;break;//1111 1111B all off

default:break;

}

}

/******************************************************************************

                                   Main function                                                           

**************************************************************************/

void main(void)

{

uchar i;

DDRA=0XFF; //Port setting, PA port is set to push-pull 1 output

PORTA=0XFF;

PORTA=0XFF; //PORTA is initialized to 1, turn off all LEDs

DelayMS(10);

while(1) //Program executes unconditionally

{

for(i=0;i<9;i++)

{

horse(i);

DelayMS(10); //Delay time is about 10MS

}

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