I2C接口的SSD1306---OLED驱动

只看该作者 · 2016-5-18 20:57

/*
这个液晶只需要两根线用模拟或者硬件的I2C都可以硬件设计非常简单
*/
#define I2C_SDA_LOW()
#define I2C_SDA_HIGH()

#define I2C_SCL_LOW()
#define I2C_SCL_HIGH()

#defien I2C_SDA_Read()

#define BIRGTHNESS          //OLED的亮度  00~255

#define OLED_WIDTH 128
#define OLED_HIGH (8*8)

#define I2C_OLED 0x78

#define I2C_Delay() //实现延时4us
/* 见名知意移植的时候只需要把以上的宏的具体实现方法写上去就可以了  下面的代码用的是普通IO口模拟I2C (速度还是可以的) 这个芯片不用上拉电阻好像也能行
*/

static void I2C_Start(void)
{
I2C_SDA_HIGH();
I2C_SCL_HIGH();
I2C_Delay();
I2C_SDA_LOW();
I2C_Delay();
I2C_SCL_LOW();
I2C_Delay();
}

static void I2C_Stop(void)
{
I2C_SDA_LOW();
I2C_SCL_HIGH();
I2C_Delay();
I2C_SDA_HIGH();
I2C_Delay();
}

static uint8_t I2C_WaitAck(void)  //0:aCK    1:NoAck
{
I2C_SDA_HIGH();
I2C_SCL_HIGH();
I2C_Delay();
if(I2C_SDA_Read())
      return 1;
I2C_SCL_LOW();
I2C_Delay();
return 0;
}

static void I2C_SendByte(uint8_t Byte)
{
uint8_t Cnt;
for(Cnt=0;Cnt<8;Cnt++)
{
      if(Byte&0x80)
         I2C_SDA_HIGH();
      else
         I2C_SDA_LOW();
      I2C_SCL_HIGH();
      I2C_Delay();
      I2C_SCL_LOW();
      I2C_Delay();
}
}

static uint8_t OLED_WriteCmd(uint8_t Cmd)
{
I2C_Start();
I2C_SendByte(I2C_OLED);
if(I2C_WaitAck())
      return 1;
I2C_SendByte(0x00);
if(I2C_WaitAck())
      return 2;
I2C_SendByte(Cmd);
if(I2C_WaitAck())
      return 3;
I2C_Stop();
return 0;
}

只看该作者 · 2016-5-18 20:58

复制

static uint8_t OLED_WriteData(uint8_t Data)

{

    I2C_Start();

    I2C_SendByte(I2C_OLED);

    if(I2C_WaitAck())

        return 1;

    I2C_SendByte(0x40);

    if(I2C_WaitAck())

        return 2;

    I2C_SendByte(Data);

    if(I2C_WaitAck())

        return 3;

    I2C_Stop();

    return 0;

}



static uint8_t OLED_SetXY(uint8_t x,uint8_t y)

{

    OLED_WriteCmd(0xb0|y);//y

    OLED_WriteCmd(((0xf0&x)>>4))|0x10);//设置x高4位

    OLED_WriteCmd(((0x0f&x)>>4))|0x01);//设置x低4位

}



uint8_t OLED_Clear(void)

{

    uint8_t x,y;

    OLED_SetXY(0,0);

    for(y=0;y<OLED_HIGH/8;y++)

    {

        if(OLED_SetXY(0,y))

            return 1;

        for(x=0;x<OLED_WIDTH;x++)

        {

            if(OLED_WriteData(0x00))

                return 2;

        }

    }

    return 0;

}



uint8_t OLED_Init(void)

{

   // 延时一下 再初始化 OLED_Delay(100000);    if(OLED_WriteCmd(0xae))

        return 1;//--turn off oled panel

    if(OLED_WriteCmd(0x00))

          return 2;//---set low column address

    if(OLED_WriteCmd(0x10))

        return 3;//---set high column address

    if(OLED_WriteCmd(0x40))

        return 4;//--set start line address  Set Mapping RAM Display Start Line (0x00~0x3F)

    if(OLED_WriteCmd(0x81))

        return 5;//--set contrast control register

    if(OLED_WriteCmd(Brightness))

        return 6; // Set SEG Output Current Brightness

    if(OLED_WriteCmd(0xa1))

        return 7;//--Set SEG/Column Mapping     0xa0左右反置 0xa1正常

    if(OLED_WriteCmd(0xc8))

        return 8;//Set COM/Row Scan Direction   0xc0上下反置 0xc8正常

    if(OLED_WriteCmd(0xa6))

        return 9;//--set normal display

    if(OLED_WriteCmd(0xa8))

        return 10;//--set multiplex ratio(1 to 64)

    if(OLED_WriteCmd(0x3f))

                return 11;//--1/64 duty

    if(OLED_WriteCmd(0xd3))

        return 12;//-set display offset        Shift Mapping RAM Counter (0x00~0x3F)

    if(OLED_WriteCmd(0x00))

        return 13;//-not offset

    if(OLED_WriteCmd(0xd5))

        return 14;//--set display clock divide ratio/oscillator frequency

    if(OLED_WriteCmd(0x80))

        return 15;//--set divide ratio, Set Clock as 100 Frames/Sec

    if(OLED_WriteCmd(0xd9))

        return 16;//--set pre-charge period

    if(OLED_WriteCmd(0xf1))

        return 17;//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock

    if(OLED_WriteCmd(0xda))

        return 18;//--set com pins hardware configuration

    if(OLED_WriteCmd(0x12))

        return 19;

    if(OLED_WriteCmd(0xdb))

        return 20;//--set vcomh

    if(OLED_WriteCmd(0x40))

        return 21;//Set VCOM Deselect Level

    if(OLED_WriteCmd(0x20))

        return 22;//-Set Page Addressing Mode (0x00/0x01/0x02)

    if(OLED_WriteCmd(0x02))

        return 23;//

    if(OLED_WriteCmd(0x8d))

        return 24;//--set Charge Pump enable/disable

    if(OLED_WriteCmd(0x14))

        return 25;//--set(0x10) disable

    if(OLED_WriteCmd(0xa4))

        return 26;// Disable Entire Display On (0xa4/0xa5)

    if(OLED_WriteCmd(0xa6))

        return 27;// Disable Inverse Display On (0xa6/a7)

    if(OLED_WriteCmd(0xaf))

        return 28;//--turn on oled panel

    if(OLED_Clear(0x00))

        return 29; //初始清屏

    if(OLED_SetXY(0,0))

        return 30;

    return 0;

}