一、I2C

I2C时序：时钟线SCL高电平下：SDA由高变低代表启动信号，开始发送数据；SCL高电平时，数据稳定，数据可以被读走，开始进行读操作，SCL低电平时，数据发生改变；每发送一个字节的数据都会产生应答信号；时钟线SCL低电平下：SDA由低变高代表传输数据结束


初始化： P6数据线（SDA） P7时钟线（SCL），选用P6和P7两根引脚，并给他们置为低电平

分别输出数据线和时钟线


开始信号：在空闲状态下先将时钟线置为低电平输出0，数据线置位高电平，再根据开始信号的触发条件：SCL高电平时，SDA由高变低，最后再拉低SCL（增加可靠性和准确行）

停止信号：SDA由低变高，原理同开始信号大差不差

ACK应答信号，假应答

发送一个字节

发送一个字节，时钟线拉低时，发送数据；拉高读取数据
void i2c_Send_Byte(char data)
{
    int i=0;
    for(i=7;i>=0;i--)//循环发送8位数据
    {
        i2c_SCL(0);//时钟线拉低
        i2c_SDA(data &(0x1<<i));//发送数据
        i2c_SCL(1);//时钟线拉高，让接受方接收数据
        
        i2c_SCL(0);//时钟线拉低
    }
}

发送多个字节

void i2c_Send_Bytes(int *p,int len)
{
    int i,j;
    for(j=0;j<len;j++)
    {
        for(i=7;i>=0;i--)
        {
            i2c_SCL(0);//时钟线拉低
            i2c_SDA(p[j] &(0x1<<i));
            i2c_SCL(1);//时钟线拉高，让接受方接收数据
            
            i2c_SCL(0);//时钟线拉低
        }
        i2c_Ack();//一个字节写完过后需要有应答信号
    }
}

二、oled

数据格式

在执行到Control Byte，写命令或者写数据是根据D\C（为0时命令，1时数据），根据数据格式写

oled的初始化需要用到IIC（引脚的配置），随后先将oled关闭，最后再打开，中间根据数据手册而写

清空函数：防止有外部因素的影响

void Oled_clear(void)
{
    int page;//页
    int seg;//列
    
    for(page=0;page<8;page++)//按页遍历
    {
        for(seg=0;seg<128;seg++)//每一页的每一列
        {
            Oled_Write_cmd(0xB0+page);//页地址
            Oled_Write_cmd(0x00+(seg & 0xf));//设置seg列的低地址
            Oled_Write_cmd(0x10+((seg>>4)&0xf));//设置seg列的高地址
            
            Oled_Write_data(0x0);//清屏
        }
        
    }
}

每一页有8行

设置行

低位与高位

显示数据：32列需要使用4页，32-64防止数据的覆盖

unsigned char buff[8][32]={
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xE0,0x3C,0x18,0x08,0x00,0x00,0x00,0x00,0xFC,0xF8,0x08,0x00,0x00,0x00,0x00,0x80,0xC0,0xE0,0x60,0x40,0x00,0x00,0x00,0x00},
{0x00,0x00,0x20,0x10,0x08,0x04,0x03,0xFF,0xFF,0x01,0x00,0x40,0x40,0x20,0x20,0x10,0xFF,0xFF,0x08,0x0C,0x06,0x02,0x03,0x01,0x00,0x00,0x00,0x00,0xF8,0x00,0x00,0x00},
{0x00,0x00,0x40,0x40,0x40,0x40,0x40,0x4F,0x47,0x40,0x40,0x40,0x40,0x40,0x40,0xFC,0xFC,0x43,0x43,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x42,0x63,0x63,0x41,0x00,0x00},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},

{0x00,0x00,0x00,0x00,0x08,0x10,0x70,0xE0,0x00,0x00,0x00,0x40,0x40,0x40,0x40,0x40,0x40,0x40,0xFC,0xFC,0x48,0x40,0x40,0x40,0x40,0x40,0x60,0x60,0x40,0x00,0x00,0x00},
{0x00,0x04,0x0C,0x18,0x78,0x30,0x00,0x80,0x78,0x24,0x20,0x20,0xA2,0x22,0x22,0x22,0x22,0x22,0x3F,0x3F,0x22,0x22,0x22,0x22,0x23,0xA3,0x22,0x30,0x30,0x20,0x00,0x00},
{0x00,0x40,0x40,0xC0,0xC0,0xE0,0x7C,0x03,0x00,0x00,0x00,0x00,0xFF,0xFF,0x91,0x91,0x91,0x91,0x91,0x91,0x91,0x91,0x91,0x91,0x91,0xFF,0xFF,0x01,0x00,0x00,0x00,0x00},
{0x00,0x00,0x00,0x00,0x3F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x10,0x10,0x30,0x70,0x3F,0x1F,0x00,0x00,0x00,0x00,0x00}
    
};void Oled_Display(void)
{
    int page;//页
    int seg;//列
    
    for(page=0;page<4;page++)//按页遍历
    {
        for(seg=0;seg<32;seg++)//每一页的每一列
        {
            Oled_Write_cmd(0xB0+page);//页地址
            Oled_Write_cmd(0x00+(seg & 0xf));//设置seg列的低地址
            Oled_Write_cmd(0x10+((seg>>4)&0xf));//设置seg列的高地址
            
            Oled_Write_data(buff[page][seg]);//显示数据
        }
        
    }
    
    for(page=0;page<4;page++)//按页遍历
    {
        for(seg=32;seg<64;seg++)//每一页的每一列
        {
            Oled_Write_cmd(0xB0+page);//页地址
            Oled_Write_cmd(0x00+(seg & 0xf));//设置seg列的低地址
            Oled_Write_cmd(0x10+((seg>>4)&0xf));//设置seg列的高地址
            
            Oled_Write_data(buff[page+4][seg-32]);//显示数据
            //当seg从 32 开始计数时，通过seg - 32可以将其转换为从 0 开始的索引，
            //这样就能正确地从buff数组中获取与当前 OLED 页面内列位置相对应的数据
        }
        
    }
}