0.96寸oled显示屏4针51的程序

以下是0.96寸OLED显示屏4针51的程序示例：

#include <reg51.h>

#define SCL P1_0
#define SDA P1_1

void delay(unsigned int x)
{
    unsigned int i, j;
    for (i = 0; i < x; i++)
        for (j = 0; j < 120; j++);
}

void start(void)
{
    SDA = 1;
    SCL = 1;
    delay(50);
    SDA = 0;
    delay(50);
    SCL = 0;
}

void stop(void)
{
    SDA = 0;
    SCL = 1;
    delay(50);
    SDA = 1;
    delay(50);
}

void write_byte(unsigned char dat)
{
    unsigned char i;
    for (i = 0; i < 8; i++)
    {
        SDA = dat & 0x80;
        SCL = 1;
        dat <<= 1;
        SCL = 0;
    }
}

void write_cmd(unsigned char cmd)
{
    start();
    write_byte(0x78);
    write_byte(0x00);
    write_byte(cmd);
    stop();
}

void write_dat(unsigned char dat)
{
    start();
    write_byte(0x78);
    write_byte(0x40);
    write_byte(dat);
    stop();
}

void init(void)
{
    write_cmd(0xAE); // 关闭显示
    write_cmd(0xD5); // 设置显示时钟分频因子和振荡器频率
    write_cmd(0x80);
    write_cmd(0xA8); // 设置驱动路数
    write_cmd(0x3F); // 设置131像素点
    write_cmd(0xD3); // 设置显示偏移
    write_cmd(0x00);
    write_cmd(0x40); // 设置显示起始行
    write_cmd(0x8D); // 开启电荷泵
    write_cmd(0x14);
    write_cmd(0x20); // 设置内存地址模式
    write_cmd(0x00);
    write_cmd(0xA1); // 设置段重映射
    write_cmd(0xC8); // 设置列重映射
    write_cmd(0xDA); // 设置COM硬件引脚配置
    write_cmd(0x12);
    write_cmd(0x81); // 设置对比度控制
    write_cmd(0xCF);
    write_cmd(0xD9); // 设置预充电周期
    write_cmd(0xF1);
    write_cmd(0xDB); // 设置VCOMH电压倍率
    write_cmd(0x40);
    write_cmd(0xA4); // 关闭全局显示开启显示
    write_cmd(0xA6); // 设置正常/反色显示
    write_cmd(0xAF); // 打开显示
}

void main(void)
{
    init();
    write_dat(0xFF);
    while (1);
}

以上代码使用51单片机控制OLED显示屏，使用4针（SCL、SDA、VCC、GND）连接。其中，start()、stop()、write_byte(unsigned char dat)、write_cmd(unsigned char cmd)、write_dat(unsigned char dat) 函数是I2C通信相关的函数，init()函数用于初始化OLED显示屏。在main()函数中，先进行初始化，然后使用write_dat(unsigned char dat)函数向OLED显示屏写入数据。