KEIL5超声波测距怎么写代码

KEIL5超声波测距的代码可以分为以下几步：

1. 定义相应的引脚和变量

sbit Ultrasonic_trig = P1^0;
sbit Ultrasonic_echo = P1^1;
unsigned int distance;

2. 初始化超声波引脚

Ultrasonic_trig = 0;
Ultrasonic_echo = 0;

3. 发送超声波信号

Ultrasonic_trig = 1;
delay_us(10);
Ultrasonic_trig = 0;

4. 接收超声波信号并计算距离

while(!Ultrasonic_echo);
TR0 = 1;
while(Ultrasonic_echo);
TR0 = 0;
distance = TH0*256+TL0;
distance = distance/58;

完整代码如下所示：

#include<reg52.h>

sbit Ultrasonic_trig = P1^0;
sbit Ultrasonic_echo = P1^1;

unsigned int distance;

void Ultrasonic_init(void)
{
    Ultrasonic_trig = 0;
    Ultrasonic_echo = 0;
    TMOD = 0x01;
    TH0 = 0;
    TL0 = 0;
}

void Ultrasonic_measure(void)
{
    Ultrasonic_trig = 1;
    delay_us(10);
    Ultrasonic_trig = 0;
    while(!Ultrasonic_echo);
    TR0 = 1;
    while(Ultrasonic_echo);
    TR0 = 0;
    distance = TH0*256+TL0;
    distance = distance/58;
}

void delay_us(unsigned int us)
{
    while(us--)
    {
        _nop_();
        _nop_();
        _nop_();
        _nop_();
    }
}

void main()
{
    Ultrasonic_init();
    while(1)
    {
        Ultrasonic_measure();
    }
}