L298N 电机驱动模块

#include <reg52.h>
#include "..\lib\delay.h"

typedef unsigned char uchar;
typedef unsigned int uint;

#define S1 0x7e
#define S2 0x7d
#define S3 0x7b
#define S4 0x77
#define S5 0xbe
#define S6 0xbd

uchar PLAY;

sbit IN1 = P1^0;
sbit IN2 = P1^1;
sbit IN3 = P1^2;
sbit IN4 = P1^3;

void Go(void)
{
    IN1 = 1;
    IN2 = 0;
    IN3 = 1;
    IN4 = 0;
    PLAY = 1;    
}

void Back(void)
{
    IN1 = 0;
    IN2 = 1;
    IN3 = 0;
    IN4 = 1;
    PLAY = 1;
}

void Stop(void)
{
       IN1 = 0;
    IN2 = 0;
    IN3 = 0;
    IN4 = 0;
    PLAY = 0;
}

void Trun_Left(void)
{
       IN1 = 1;
    IN2 = 0;
    IN3 = 0;
    IN4 = 1;
    PLAY = 1;
}

void Trun_Right(void)
{
    IN1 = 0;
    IN2 = 1;
    IN3 = 1;
    IN4 = 0;
    PLAY = 1;
}

uchar keyscan(void)                     //使用行列反转扫描法  
{
    uchar cord_h, cord_l;             //行列值中间变量
    P3 = 0x0f;                         //行线输出全为0
    cord_h = P3 & 0x0f;                 //读入列线值
    if(cord_h != 0x0f)                 //先检测有无按键按下
    {
        delay_us(100);               //去抖
        if(cord_h != 0x0f)
        {
            cord_h = P3 & 0x0f;      //读入列线值
            P3 = cord_h | 0xf0;      //输出当前列线值
            cord_l = P3 & 0xf0;      //读入行线值
            return(cord_h + cord_l); //键盘最后组合码值
        }
    }
return (0xff);
}

void main()
{
    uchar key;
    P2 = 0x00;
    Stop();
while(1)
    {
        key = keyscan();
switch(key)
        {
case S1:Go();break; 
case S2:Back();break; 
case S3:Trun_Left();break;
case S4:Trun_Right();break;
case S5:Stop();break;
        }
    }
}