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此仿真是基于单片机直流电机控制系统，使用了用L298驱动直流电机，并用按键控制电机正转、反转、加速、减速、停止、启动等功能，并用LCD作为电机状态显示，实现了基于L298N对电机PWM调速(示波器可观察PWM调速过程)。PWM调
速对LED进行灯光调节。

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#include <reg52.h>
#include <intrins.h>
#define uchar	unsigned char
#define uint	unsigned int
#define lcd	P0      /* lcd定义 */
#define KEY	P3      /*按键定义 */
void LCD_Writecmd( uchar cmd );


void LCD_Writedata( uchar dat );

void LCD_write_char( uchar x, uchar y, char ch );

void LCD_write_str( uchar x, uchar y, char str[] );

void LCD_Init( void );

void LCD_clear();

void delay_us( uchar n );

void delay_ms( uchar m );


sbit	RW	= P2 ^ 1;
sbit	RS	= P2 ^ 0;
sbit	EN	= P2 ^ 2;
sbit	pwm1	= P1 ^ 0;
sbit	pwm2	= P1 ^ 1;
sbit	pwm	= P1 ^ 3;

sbit	ZHENG	= P1 ^ 4;
sbit	FAN	= P1 ^ 5;
sbit	TIAO	= P1 ^ 6;
void timer_init();


uchar a = 50, b = 0, c = 0, flag = 0, flag1 = 0;

void main()
{
	LCD_Init();
	timer_init();
	LCD_write_str( 0, 0, "State:" );
	while ( 1 )
	{
		b	= a / 10 + 0x30;
		c	= a % 10 + 0x30;
		if ( KEY == 0xfe )
		{

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