我正在尝试使用 8051 微控制器伺服电机超声波传感器和 16*2lcd 显示器制作迷你雷达模型 我已经给出了我的代码如下
#include<reg51.h> // include header file for 8051 microcontroller
// Define pins for ultrasonic sensor
sbit trig = P1^0;
sbit echo = P1^1;
// Define pins for LCD display
sbit rs = P2^0;
sbit rw = P2^1;
sbit en = P2^2;
sbit servo_pin = P3^0;
// Global variables
unsigned int distance; // to store distance measured by ultrasonic sensor
unsigned char angle; // to store angle of detected object
unsigned char buffer[10]; // buffer to store distance and angle data for display on LCD
// Function prototypes
void delay(unsigned int time);
void lcd_cmd(unsigned char command);
void lcd_data(unsigned char dat);
void lcd_init();
void lcd_string(unsigned char *str);
void servo_rotate(unsigned char degrees);
void ultrasonic_sensor(void);
void main()
{
lcd_init(); // initialize LCD display
servo_rotate(0); // set servo motor to starting position
while(1)
{
ultrasonic_sensor(); // measure distance and angle of detected object
sprintf(buffer, "Distance: %dcm", distance);
lcd_cmd(0x80); // set cursor to first line on LCD
lcd_string(buffer); // display distance data on first line of LCD
sprintf(buffer, "Angle: %d", angle);
lcd_cmd(0xC0); // set cursor to second line on LCD
lcd_string(buffer); // display angle data on second line of LCD
delay(1000); // wait for 1 second before measuring again
}
}
// Function to generate delay in microseconds
void delay(unsigned int time)
{
unsigned int i, j;
for(i=0;i<time;i++)
{
for(j=0;j<12;j++);
}
}
// Function to send commands to LCD display
void lcd_cmd(unsigned char command)
{
P0 = command;
rs = 0; // set RS pin low for command mode
rw = 0; // set RW pin low for write mode
en = 1; // set EN pin high to enable LCD
delay(1); // wait for some time
en = 0; // set EN pin low to disable LCD
}
// Function to send data to LCD display
void lcd_data(unsigned char dat)
{
P0 = data;
rs = 1; // set RS pin high for data mode
rw = 0; // set RW pin low for write mode
en = 1; // set EN pin high to enable LCD
delay(1); // wait for some time
en = 0; // set EN pin low to disable LCD
}
// Function to initialize LCD display
void lcd_init()
{
lcd_cmd(0x38); // 2 lines, 5x7 matrix
lcd_cmd(0x0E); // display on, cursor blinking
lcd_cmd(0x01); // clear display
lcd_cmd(0x80); // set cursor to first line on LCD
}
// Function to display string on LCD display
void lcd_string(unsigned char *str)
{
while(*str)
{
lcd_data(*str++);
}
}
// Function to rotate servo motor to specified degrees
// Function to rotate servo motor to specified degrees
void servo_rotate(unsigned char degrees)
{
unsigned char i;
for(i=0;i<degrees;i++)
{
servo_pin = 1;
delay(10); // wait for 10 milliseconds
servo_pin = 0;
delay(10); // wait for 10 milliseconds
}
}
// Function to measure distance and angle of detected object using ultrasonic sensor and servo motor
void ultrasonic_sensor()
{
unsigned int i;
unsigned int duration;
unsigned int angle_list[150]; // angle list for servo motor
unsigned int distance_list[150]; // list to store distance measured at each angle
for(i=1;i<=150;i++)
{
angle_list[i-1] = i;
}
for(i=0;i<150;i++)
{
servo_rotate(angle_list[i]); // rotate servo motor to current angle
delay(100); // wait for some time before taking measurement
trig = 1; // set trig pin high to trigger ultrasonic sensor
delay(10); // wait for 10 microseconds
trig = 0; // set trig pin low to stop triggering
while(!echo); // wait for echo pin to go high
TMR1 = 0; // reset Timer1
while(echo) // measure duration of echo pulse
{
TMR1++;
delay(1); // wait for 1 microsecond
}
duration = TMR1; // store duration of echo pulse
distance_list[i] = duration * 0.017; // calculate distance in centimeters
}
// Find minimum distance and corresponding angle
unsigned int min_distance = distance_list[0];
unsigned int min_distance_index = 0;
for(i=1;i<150;i++)
{
if(distance_list[i] < min_distance)
{
min_distance = distance_list[i];
min_distance_index = i;
}
}
distance = min_distance; // set global variable for distance measurement
angle = angle_list[min_distance_index]; // set global variable for angle of detected object
}
在 keil 中构建此程序时，我收到错误消息
radar.c(34): warning C206: 'sprintf': missing function-prototype
radar.c(34): error C267: 'sprintf': requires ANSI-style prototype
radar.c(127): error C202: 'TMR1': undefined identifier
radar.c(130): error C202: 'TMR1': undefined identifier
radar.c(133): error C202: 'TMR1': undefined identifier
radar.c(137): error C141: syntax error near 'unsigned', expected
'__asm'
radar.c(137): error C202: 'min_distance': undefined identifier
radar.c(138): error C141: syntax error near 'unsigned', expected
'__asm'
radar.c(138): error C202: 'min_distance_index': undefined identifier
radar.c(141): error C202: 'min_distance': undefined identifier
radar.c(143): error C202: 'min_distance': undefined identifier
radar.c(144): error C202: 'min_distance_index': undefined identifier
radar.c(147): error C202: 'min_distance': undefined identifier
radar.c(148): error C202: 'min_distance_index': undefined identifier
radar.c(149): error C241: 'ultrasonic_sensor': auto segment too large
我交叉检查缺少分号的代码，但没有问题
我只是想知道如何解决这个错误
我强烈认为是这一行：
void lcd_data(unsigned char data);不能使用
data有关完整列表，请参阅文档的这一页。
将其重命名为其他名称，错误消失了。