学习I2C的配置，使用I2C驱动OLED显示屏。

一、硬件连接

使用i2c1的PB6和PB7引脚。

二、配置I2C

2.1、选择i2c1

2.2、配置引脚

三、代码

3.1、oled.c

#include "main.h"
#include "oled/oled.h"
#include "oled/codetab.h"

extern I2C_HandleTypeDef hi2c1;

void I2C_WriteByte(uint8_t addr, uint8_t dat)
{
  uint8_t temp[2];
  temp[0] = dat;
    HAL_I2C_Mem_Write(&hi2c1,OLED_ADDRESS,addr,I2C_MEMADD_SIZE_8BIT,temp,1,10);
}


void WriteCmd(unsigned char I2C_Command)
{
    I2C_WriteByte(0x00, I2C_Command);
}

void WriteDat(unsigned char I2C_Data) 
{
    I2C_WriteByte(0x40, I2C_Data);
}

void OLED_WrCmd(unsigned char IIC_Command)
{
    WriteCmd(IIC_Command);
}

void OLED_Init(void)
{
    HAL_Delay(100);
    WriteCmd(0xAE); //display off
    WriteCmd(0x20); //Set Memory Addressing Mode
    WriteCmd(0x10); //00,Horizontal Addressing Mode;01,Vertical Addressing Mode;10,Page Addressing Mode (RESET);11,Invalid
    WriteCmd(0xb0); //Set Page Start Address for Page Addressing Mode,0-7
    WriteCmd(0xc8); //Set COM Output Scan Direction
    WriteCmd(0x00); //---set low column address
    WriteCmd(0x10); //---set high column address
    WriteCmd(0x40); //--set start line address
    WriteCmd(0x81); //--set contrast control register
    WriteCmd(0xff); //ÁÁ¶Èµ÷½Ú 0x00~0xff
    WriteCmd(0xa1); //--set segment re-map 0 to 127
    WriteCmd(0xa6); //--set normal display
    WriteCmd(0xa8); //--set multiplex ratio(1 to 64)
    WriteCmd(0x3F); //
    WriteCmd(0xa4); //0xa4,Output follows RAM content;0xa5,Output ignores RAM content
    WriteCmd(0xd3); //-set display offset
    WriteCmd(0x00); //-not offset
    WriteCmd(0xd5); //--set display clock divide ratio/oscillator frequency
    WriteCmd(0xf0); //--set divide ratio
    WriteCmd(0xd9); //--set pre-charge period
    WriteCmd(0x22); //
    WriteCmd(0xda); //--set com pins hardware configuration
    WriteCmd(0x12);
    WriteCmd(0xdb); //--set vcomh
    WriteCmd(0x40); //0x20,0.77xVcc
    WriteCmd(0x8d); //--set DC-DC enable
    WriteCmd(0x14); //
    WriteCmd(0xaf); //--turn on oled panel
}

void OLED_SetPos(unsigned char x, unsigned char y) 
{ 
    WriteCmd(0xb0+y);
    WriteCmd(((x&0xf0)>>4)|0x10);
    WriteCmd((x&0x0f)|0x01);
}

void OLED_Fill(unsigned char fill_Data)//È«ÆÁÌî³ä
{
    unsigned char m,n;
    for(m=0;m<8;m++)
    {
        WriteCmd(0xb0+m);       //page0-page1
        WriteCmd(0x00);     //low column start address
        WriteCmd(0x10);     //high column start address
        for(n=0;n<128;n++)
            {
                WriteDat(fill_Data);
            }
    }
}

void OLED_CLS(void)//ÇåÆÁ
{
    OLED_Fill(0xff);
}

void OLED_ON(void)
{
    WriteCmd(0X8D);  //ÉèÖõçºÉ±Ã
    WriteCmd(0X14);  //¿ªÆôµçºÉ±Ã
    WriteCmd(0XAF);  //OLED»½ÐÑ
}

void OLED_OFF(void)
{
    WriteCmd(0X8D);  //ÉèÖõçºÉ±Ã
    WriteCmd(0X10);  //¹Ø±ÕµçºÉ±Ã
    WriteCmd(0XAE);  //OLEDÐÝÃß
}

void OLED_ShowStr(unsigned char x, unsigned char y, unsigned char ch[], unsigned char TextSize)
{
    unsigned char c = 0,i = 0,j = 0;
    switch(TextSize)
    {
        case 1:
        {
            while(ch[j] != '\0')
            {
                c = ch[j] - 32;
                if(x > 126)
                {
                    x = 0;
                    y++;
                }
                OLED_SetPos(x,y);
                for(i=0;i<6;i++)
                    WriteDat(F6x8[c][i]);
                x += 6;
                j++;
            }
        }break;
        case 2:
        {
            while(ch[j] != '\0')
            {
                c = ch[j] - 32;
                if(x > 120)
                {
                    x = 0;
                    y++;
                }
                OLED_SetPos(x,y);
                for(i=0;i<8;i++)
                    WriteDat(F8X16[c*16+i]);
                OLED_SetPos(x,y+1);
                for(i=0;i<8;i++)
                    WriteDat(F8X16[c*16+i+8]);
                x += 8;
                j++;
            }
        }break;
    }
}

void OLED_ShowCN(unsigned char x, unsigned char y, unsigned char N)
{
    unsigned char wm=0;
    unsigned int  adder=32*N;
    OLED_SetPos(x , y);
    for(wm = 0;wm < 16;wm++)
    {
        WriteDat(F16x16[adder]);
        adder += 1;
    }
    OLED_SetPos(x,y + 1);
    for(wm = 0;wm < 16;wm++)
    {
        WriteDat(F16x16[adder]);
        adder += 1;
    }
}

void OLED_DrawBMP(unsigned char x0,unsigned char y0,unsigned char x1,unsigned char y1,unsigned char BMP[])
{
    unsigned int j=0;
    unsigned char x,y;

  if(y1%8==0)
        y = y1/8;
  else
        y = y1/8 + 1;
    for(y=y0;y<y1;y++)
    {
        OLED_SetPos(x0,y);
    for(x=x0;x<x1;x++)
        {
            WriteDat(BMP[j++]);
        }
    }
}

3.2、main.c

int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* Configure the System Power */
  SystemPower_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_ADC1_Init();
  MX_ICACHE_Init();
  MX_USART1_UART_Init();
  MX_USB_DRD_FS_HCD_Init();
  MX_I2C1_Init();
  /* USER CODE BEGIN 2 */

    OLED_Init();
    OLED_Fill(0x00);
    OLED_ShowStr(0,0,"STM32U545RE",2);
    OLED_ShowStr(0,2,"I2C OLED DISP",2);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
        HAL_GPIO_TogglePin(LED_GREEN_GPIO_Port, LED_GREEN_Pin);
    HAL_Delay(200);
        printf("hello\r\n");


  }
  /* USER CODE END 3 */
}

四、运行

程序下载后，复位开发板运行。

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