OLED+STC89C52

为了在STC89C52单片机上使用OLED显示屏，需要使用IIC总线协议进行通信。以下是使用C51_IIC例程的OLED程序例程，可以作为学习和参考的样本：

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

#define OLED_SCL P2_1
#define OLED_SDA P2_0

sbit OLED_RST = P2^2;
sbit OLED_DC = P2^3;
sbit OLED_CS = P2^4;

void delay_ms(unsigned int ms)
{
    unsigned int i, j;
    for (i = 0; i < ms; i++)
        for (j = 0; j < 114; j++);
}

void OLED_WrDat(unsigned char dat)
{
    unsigned char i;
    OLED_DC = 1;
    for (i = 0; i < 8; i++)
    {
        OLED_SCL = 0;
        if (dat & 0x80)
            OLED_SDA = 1;
        else
            OLED_SDA = 0;
        OLED_SCL = 1;
        dat <<= 1;
    }
}

void OLED_WrCmd(unsigned char cmd)
{
    unsigned char i;
    OLED_DC = 0;
    for (i = 0; i < 8; i++)
    {
        OLED_SCL = 0;
        if (cmd & 0x80)
            OLED_SDA = 1;
        else
            OLED_SDA = 0;
        OLED_SCL = 1;
        cmd <<= 1;
    }
}

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

void OLED_Fill(unsigned char bmp_dat)
{
    unsigned char y, x;
    for (y = 0; y < 8; y++)
    {
        OLED_WrCmd(0xb0 + y);
        for (x = 0; x < 128; x++)
            OLED_WrDat(bmp_dat);
    }
}

void OLED_CLS(void)
{
    unsigned char y, x;
    for (y = 0; y < 8; y++)
    {
        OLED_WrCmd(0xb0 + y);
        for (x = 0; x < 128; x++)
            OLED_WrDat(0);
    }
}

void OLED_Init(void)
{
    OLED_RST = 0;
    delay_ms(50);
    OLED_RST = 1;
    OLED_CS = 0;
    OLED_WrCmd(0xae);
    OLED_WrCmd(0x00);
    OLED_WrCmd(0x10);
    OLED_WrCmd(0x40);
    OLED_WrCmd(0x81);
    OLED_WrCmd(0xcf);
    OLED_WrCmd(0xa1);
    OLED_WrCmd(0xc8);
    OLED_WrCmd(0xa6);
    OLED_WrCmd(0xa8);
    OLED_WrCmd(0x3f);
    OLED_WrCmd(0xd3);
    OLED_WrCmd(0x00);
    OLED_WrCmd(0xd5);
    OLED_WrCmd(0x80);
    OLED_WrCmd(0xd9);
    OLED_WrCmd(0xf1);
    OLED_WrCmd(0xda);
    OLED_WrCmd(0x12);
    OLED_WrCmd(0xdb);
    OLED_WrCmd(0x40);
    OLED_WrCmd(0x20);
    OLED_WrCmd(0x02);
    OLED_WrCmd(0x8d);
    OLED_WrCmd(0x14);
    OLED_WrCmd(0xa4);
    OLED_WrCmd(0xa6);
    OLED_WrCmd(0xaf);
    OLED_CS = 1;
    OLED_CLS();
}

void main()
{
    OLED_Init();
    OLED_Fill(0xff);
    delay_ms(1000);
    OLED_CLS();
    OLED_SetPos(0, 0);
    OLED_WrDat('H');
    OLED_WrDat('e');
    OLED_WrDat('l');
    OLED_WrDat('l');
    OLED_WrDat('o');
    while (1);
}