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上面的程序中有sbit NUM_1=P2^4;这个，是打开第一位数码管，没用到位选，这也可以吗？还有这个我用L298n为啥电机没动了？
#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit L1=P1^0;
sbit L2=P1^1;
sbit R1=P1^2;
sbit R2=P1^3;
sbit key_down=P3^4;
sbit key_set=P3^5;
sbit key_up=P3^6;
sbit NUM_1=P2^4;
uchar PWM;
uchar num=0,duty=0,speed=0;
uchar code table[]={
0x3F, //"0"
0x06, //"1"
0x5B, //"2"
0x4F, //"3"
0x66, //"4"
0x6D, //"5"
0x7D, //"6"
0x07, //"7"
0x7F, //"8"
0x6F, //"9"
0x77, //"A"
0x7C, //"B"
0x39, //"C"
0x5E, //"D"
0x79, //"E"
0x71, //"F"
0x76, //"H"
0x38, //"L"
0x37, //"n"
0x3E, //"u"
0x73, //"P"
0x5C, //"o"
0x40, //"-"
0x00, //熄灭
0x00 //自定义
};
void delay(uchar i)
{
uchar j,k;
for(j=i;j>0;j--)
for(k=125;k>0;k--);
}
void car_forward(uchar speed)
{ duty=speed;
L1=0;
L2=PWM;
R1=0;
R2=PWM;
}
void car_stop(void)
{ L1=0;
L2=0;
R1=0;
R2=0;
}
void main(void)
{ TMOD=0x02;
EA=1;
TH0=0XC3;
TL0=0XC3;
ET0=1;
TR0=1;
NUM_1=0;
P0=table[speed];
while(1)
{ if(key_down==0 || key_up==0)
{ET0=0;
car_stop();
delay(10);
if(key_up==0)
{
speed++;
}
else if(key_down==0)
{ if(speed != 0)
{
speed-- ;
}
}
P0=table[speed];
while(key_down==0 || key_up==0)
{ ET0=1;
if(key_set==0)
{ ET0=0;
car_stop();
speed=0;
P0=table[speed];
}
}
}
}
}
void timer0(void) interrupt 1
{ num++;
if(num <= duty)
{
PWM=1;
}
else
{
PWM=0;
}
if(num >= 10)
{
num=0;
}
car_forward(speed);
}
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