生成一个用C52单片机，超声波测距，要求：oled屏幕

显示距离值的程序

以下是使用C语言编写的超声波测距程序，使用C52单片机和OLED屏幕显示距离值：

#include <reg52.h>
#include <intrins.h>

#define FREQ 11059200UL

sbit TRIG = P1^0;
sbit ECHO = P1^1;

unsigned char code font_6x8[95][6];

unsigned int distance = 0;

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

void delay_ms(unsigned int ms)
{
    while(ms--)
    {
        delay_us(1000);
    }
}

void init()
{
    TMOD = 0x01;
    TH0 = 0;
    TL0 = 0;
    EA = 1;
    ET0 = 1;
    TRIG = 0;
}

void display(unsigned char x, unsigned char y, unsigned char ch)
{
    unsigned char i, j;
    ch -= 32;
    for(i = 0; i < 6; i++)
    {
        j = font_6x8[ch][i];
        OLED_SetPos(x, y + i);
        OLED_WrDat(j);
    }
}

void OLED_Init()
{
    OLED_WR_Byte(0xAE,OLED_CMD);//--display off
    OLED_WR_Byte(0x00,OLED_CMD);//---set low column address
    OLED_WR_Byte(0x10,OLED_CMD);//---set high column address
    OLED_WR_Byte(0x40,OLED_CMD);//--set start line address
    OLED_WR_Byte(0xB0,OLED_CMD);//--set page address
    OLED_WR_Byte(0x81,OLED_CMD); // contract control
    OLED_WR_Byte(0xFF,OLED_CMD);//--128
    OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap
    OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverse
    OLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)
    OLED_WR_Byte(0x3F,OLED_CMD);//--1/64 duty
    OLED_WR_Byte(0xC8,OLED_CMD);//Com scan direction
    OLED_WR_Byte(0xD3,OLED_CMD);//set display offset
    OLED_WR_Byte(0x00,OLED_CMD);//

    OLED_WR_Byte(0xD5,OLED_CMD);//set osc division
    OLED_WR_Byte(0x80,OLED_CMD);//

    OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode off
    OLED_WR_Byte(0x05,OLED_CMD);//

    OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge Period
    OLED_WR_Byte(0xF1,OLED_CMD);//

    OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartion
    OLED_WR_Byte(0x12,OLED_CMD);//

    OLED_WR_Byte(0xDB,OLED_CMD);//set Vcomh
    OLED_WR_Byte(0x30,OLED_CMD);//

    OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enable
    OLED_WR_Byte(0x14,OLED_CMD);//

    OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panel
}

void OLED_SetPos(unsigned char x, unsigned char y)
{
    OLED_WR_Byte(0xb0 + y, OLED_CMD);
    OLED_WR_Byte(((x & 0xf0) >> 4) | 0x10, OLED_CMD);
    OLED_WR_Byte((x & 0x0f), OLED_CMD);
}

void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
    unsigned char i;
    if(cmd)
    {
        OLED_DC = 1;
    }
    else
    {
        OLED_DC = 0;
    }

    OLED_CS = 0;
    for(i = 0; i < 8; i++)
    {
        OLED_SCLK = 0;
        if(dat & 0x80)
        {
            OLED_SDIN = 1;
        }
        else
        {
            OLED_SDIN = 0;
        }
        OLED_SCLK = 1;
        dat <<= 1;
    }
    OLED_CS = 1;
}

void OLED_Clear()
{
    unsigned char i, j;
    for(i = 0; i < 8; i++)
    {
        OLED_SetPos(0,i);
        for(j = 0; j < 128; j++)
        {
            OLED_WrDat(0);
        }
    }
}

void OLED_WrDat(unsigned char dat)
{
    OLED_WR_Byte(dat, OLED_DATA);
}

void Timer0_ISR() interrupt 1
{
    static unsigned int counter = 0;
    if(counter > 50)
    {
        TRIG = 1;
        delay_us(10);
        TRIG = 0;
        while(ECHO == 0);
        TH0 = 0;
        TL0 = 0;
        while(ECHO == 1);
        distance = (unsigned int)(TH0 << 8 | TL0) / 58;
        counter = 0;
    }
    counter++;
}

void main()
{
    init();
    OLED_Init();
    OLED_Clear();
    while(1)
    {
        display(0, 0, 'D');
        display(6, 0, 'i');
        display(12, 0, 's');
        display(18, 0, 't');
        display(24, 0, 'a');
        display(30, 0, 'n');
        display(36, 0, 'c');
        display(42, 0, 'e');
        display(48, 0, ':');
        display(54, 0, ' ');

        display(72, 0, distance / 100 + '0');
        display(78, 0, distance % 100 / 10 + '0');
        display(84, 0, distance % 10 + '0');

        delay_ms(100);
        OLED_Clear();
    }
}

该程序通过超声波测距模块测量距离，并在OLED屏幕上显示距离值。程序中使用了定时器0来计数，每50个计数就触发一次超声波测距，并计算距离值。距离值通过数字的方式在OLED屏幕上显示。