本篇文章来自极术社区与兆易创新组织的GD32F427开发板评测活动，更多开发板试用活动请关注极术社区网站。作者：Stark_GS

I2C 简介及特点

• 并行总线至 I2C 总线协议的转换及接口；
• 同一接口既可实现主机功能又可实现从机功能；
• 主从机之间的双向数据传输；
• 支持 7 位和 10 位的地址模式和广播寻址；
• 支持 I2C 多主机模式；
• 支持标速（最高 100 kHz），快速（最高 400 kHz）
• 从机模式下可配置的 SCL 主动拉低；
• 支持 DMA 模式；
• 兼容 SMBus 2.0 和 PMBus；
• 两个中断：字节成功发送中断和错误事件中断；
• 可选择的 PEC （报文错误校验） 生成和校验；
• 支持 SAM_V 模式。
• GD32F450 支持数字和模拟噪声滤波器。

I2C （内部集成电路总线） 模块提供了符合工业标准的两线串行制接口，可用于 MCU 和外部 I2C 设备的通讯。 I2C 总线使用两条串行线：串行数据线 SDA 和串行时钟线 SCL。

I2C 接口模块实现了 I2C 协议的标速模式，快速模式，具备 CRC 计算和校验功能、支持 SMBus（系统管理总线） 和 PMBus （电源管理总线） 和 SAM_V（验证安全控制模块）模式，此外还支持多主机 I2C 总线架构。 I2C 接口模块也支持 DMA 模式，可有效减轻 CPU 的负担。

开发环境&参考文档

• Keil-MDK 5.27.1.0
• Windows11
• 固件库-GD32F4xx_Firmware_Library_V3.0.2
• GD32F427xx_Datasheet_Rev1.2
• GD32F4xx_User_Manual_Rev2.7_CN
• GD32F4xx 固件库使用指南_V1.0

代码部分

I2C 初始化配置

I2C.h 文件

#ifndef _IIC_H_
#define _IIC_H_

#include "gd32f4xx.h"

void IIC_Init(void);

#endif

I2C.c 文件

#include "iic.h"


void IIC_Init(void)
{
    rcu_periph_clock_enable(RCU_GPIOB);//启用外设时钟功能
    rcu_periph_clock_enable(RCU_I2C0);
    
    gpio_af_set(GPIOB,GPIO_AF_4,GPIO_PIN_6);//端口复用为串口模式
    gpio_af_set(GPIOB,GPIO_AF_4,GPIO_PIN_7);
    
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_6);                //设置IIC_SCL模式    
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6);    //设置GPIO输出类型和速度
    
    gpio_mode_set(GPIOB, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_7);                //设置IIC_SDA模式
    gpio_output_options_set(GPIOB, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_7);    //设置GPIO输出类型和速度
    
    i2c_deinit(I2C0);//复位I2C0
    i2c_clock_config(I2C0, 400000, I2C_DTCY_2);//设置波特率
    i2c_mode_addr_config(I2C0, I2C_I2CMODE_ENABLE, I2C_ADDFORMAT_7BITS, 0x78);//设置模式、传输数据长度、主机地址

    i2c_enable (I2C0);//使能外设
    i2c_ack_config(I2C0,I2C_ACK_ENABLE);
}

OLED 初始化函数

oled.h 文件

#ifndef __OLED_H
#define __OLED_H    

#include "iic.h"
#include "stdlib.h"

#include "systick.h"

#define OLED_MODE 0
#define SIZE 8
#define XLevelL        0x00
#define XLevelH        0x10
#define Max_Column    128
#define Max_Row        32
#define    Brightness    0xFF 
#define X_WIDTH     128
#define Y_WIDTH     32                                  
//-----------------OLED IIC端口定义----------------                         
#define OLED_SCLK_Clr() gpio_bit_reset(GPIOC, GPIO_PIN_7)//SCL IIC接口的时钟信号
#define OLED_SCLK_Set() gpio_bit_set(GPIOC, GPIO_PIN_7)

#define OLED_SDIN_Clr() gpio_bit_reset(GPIOC, GPIO_PIN_8)//SCL IIC接口的数据信号
#define OLED_SDIN_Set() gpio_bit_set(GPIOC, GPIO_PIN_8)
              
#define OLED_CMD  0    //写命令
#define OLED_DATA 1    //写数据

#define S_I2C     1//软件IIC或硬件IIC开关

#define u8 unsigned char
#define u32 unsigned int

//OLED控制用函数
void fill_picture(unsigned char fill_Data);
void IIC_Start(void);
void IIC_Stop(void);
void IIC_Wait_Ack(void);
void Write_IIC_Command(unsigned char IIC_Command);
void Write_IIC_Data(unsigned char IIC_Data);
void Write_IIC_Byte(unsigned char IIC_Byte);

void OLED_WR_Byte(unsigned dat,unsigned cmd);  
void OLED_Display_On(void);
void OLED_Display_Off(void);                                                  
void OLED_Init(void);
void OLED_Clear(void);
void OLED_DrawPoint(u8 x,u8 y,u8 t);
void OLED_Fill(u8 x1,u8 y1,u8 x2,u8 y2,u8 dot);
void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 Char_Size);
void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size);
void OLED_ShowString(u8 x,u8 y, u8 *p,u8 Char_Size);     
void OLED_Set_Pos(unsigned char x, unsigned char y);
void OLED_ShowCHinese(u8 x,u8 y,u8 no);
void OLED_DrawBMP(unsigned char x0, 
                unsigned char y0,
                unsigned char x1, 
                unsigned char y1,
                unsigned char BMP[]);



#endif

oled.c 文件

软件I2C与硬件I2C的选定在 .h 文件中有说明。#define S_I2C 0//软件IIC或硬件IIC开关

具体区别在下列两个函数中
Write_IIC_Command()
Write_IIC_Data()

#include "oled.h"
#include "stdlib.h"
#include "oledfont.h"      
#include "iic.h"
//OLED 的显存
//[0]0 1 2 3 ... 127    
//[1]0 1 2 3 ... 127    
//[2]0 1 2 3 ... 127    
//[3]0 1 2 3 ... 127    
//[4]0 1 2 3 ... 127    
//[5]0 1 2 3 ... 127    
//[6]0 1 2 3 ... 127    
//[7]0 1 2 3 ... 127     

/**********************************************
//Software IIC Start
**********************************************/
#define OLED_Dly    5

void OLED_Delay(uint32_t Num)
{
    while(Num)
    {
        Num--;
    }
}

void IIC_Start(void)
{
    OLED_SCLK_Set();OLED_Delay(OLED_Dly);
    OLED_SDIN_Set();OLED_Delay(OLED_Dly);
    OLED_SDIN_Clr();OLED_Delay(OLED_Dly);
    OLED_SCLK_Clr();OLED_Delay(OLED_Dly);
}
/**********************************************
//Software IIC Stop
**********************************************/
void IIC_Stop(void)
{
    OLED_SCLK_Set();OLED_Delay(OLED_Dly);
    OLED_SDIN_Clr();OLED_Delay(OLED_Dly);
    OLED_SDIN_Set();OLED_Delay(OLED_Dly);
}
/**********************************************
//Software IIC Ack
**********************************************/
void IIC_Wait_Ack(void)
{
    OLED_SCLK_Set();OLED_Delay(OLED_Dly);
    OLED_SCLK_Clr();OLED_Delay(OLED_Dly);
}
/**********************************************
// IIC Write byte
**********************************************/
void Write_IIC_Byte(unsigned char IIC_Byte)
{
    unsigned char i;
    unsigned char m,da;
    da=IIC_Byte;
    OLED_SCLK_Clr();OLED_Delay(OLED_Dly);
    for(i=0;i<8;i++)        
    {
        m=da;
        m=m&0x80;
        if(m==0x80)
        {
            OLED_SDIN_Set();OLED_Delay(OLED_Dly);
        }
        else 
        OLED_SDIN_Clr();OLED_Delay(OLED_Dly);
        da=da<<1;
        OLED_SCLK_Set();OLED_Delay(OLED_Dly);
        OLED_SCLK_Clr();OLED_Delay(OLED_Dly);
    }
}
/**********************************************
// IIC Write Command
**********************************************/
void Write_IIC_Command(unsigned char IIC_Command)
{
    #if S_I2C
    IIC_Start();
    Write_IIC_Byte(0x78);            //Slave address,SA0=0
    IIC_Wait_Ack();    
    Write_IIC_Byte(0x00);            //write command
    IIC_Wait_Ack();    
    Write_IIC_Byte(IIC_Command); 
    IIC_Wait_Ack();    
    IIC_Stop();
    #else
    while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));
    i2c_start_on_bus (I2C0);
    while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));//进入主机模式
    i2c_master_addressing(I2C0, 0x78, I2C_TRANSMITTER);
    while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));//判断地址发送出去
    i2c_flag_clear (I2C0, I2C_FLAG_ADDSEND);//清除ADDSEND位
    while(SET != i2c_flag_get(I2C0, I2C_FLAG_TBE));//进入数据发送状态
    i2c_data_transmit (I2C0, 0x00);
    while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
    i2c_data_transmit (I2C0, IIC_Command);
    while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
    i2c_stop_on_bus (I2C0);
    while(I2C_CTL0(I2C0)&0x0200);
    #endif
}
/**********************************************
// IIC Write Data
**********************************************/
void Write_IIC_Data(unsigned char IIC_Data)
{
    #if S_I2C
    IIC_Start();
    Write_IIC_Byte(0x78);            //Slave address,SA0=0
    IIC_Wait_Ack();    
    Write_IIC_Byte(0x40);            //write data
    IIC_Wait_Ack();    
    Write_IIC_Byte(IIC_Data);
    IIC_Wait_Ack();    
    IIC_Stop();
    #else
    while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));
    i2c_start_on_bus (I2C0);
    while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));//进入主机模式
    i2c_master_addressing(I2C0, 0x78, I2C_TRANSMITTER);
    while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));//判断地址发送出去
    i2c_flag_clear (I2C0, I2C_FLAG_ADDSEND);//清除ADDSEND位
    while(SET != i2c_flag_get(I2C0, I2C_FLAG_TBE));//进入数据发送状态
    i2c_data_transmit (I2C0, 0x40);
    while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
    i2c_data_transmit (I2C0, IIC_Data);
    while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
    i2c_stop_on_bus (I2C0);
    while(I2C_CTL0(I2C0)&0x0200);
    #endif
}
void OLED_WR_Byte(unsigned dat,unsigned cmd)
{
    if(cmd)
    {
        Write_IIC_Data(dat);
    }
    else 
    {
        Write_IIC_Command(dat);    
    }
}
/********************************************
//Fill Picture
********************************************/
void fill_picture(unsigned char fill_Data)
{
    unsigned char m,n;
    for(m=0;m<8;m++)
    {
        OLED_WR_Byte(0xb0+m,0);        //page0-page1
        OLED_WR_Byte(0x00,0);        //low column start address
        OLED_WR_Byte(0x10,0);        //high column start address
        for(n=0;n<128;n++)
        {
            OLED_WR_Byte(fill_Data,1);
        }
    }
}
/**********************************************
//Set Position
//坐标设置
**********************************************/
void OLED_Set_Pos(unsigned char x, unsigned char y) 
{     
    OLED_WR_Byte(0xb0+y,OLED_CMD);
    OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);
    OLED_WR_Byte((x&0x0f),OLED_CMD); 
}         
/**********************************************
//Turn on OLED display  
//开启OLED显示    
**********************************************/
void OLED_Display_On(void)
{
    OLED_WR_Byte(0X8D,OLED_CMD);  //SET DCDC命令
    OLED_WR_Byte(0X14,OLED_CMD);  //DCDC ON
    OLED_WR_Byte(0XAF,OLED_CMD);  //DISPLAY ON
}   
/**********************************************
//Turn off OLED display
//关闭OLED显示    
**********************************************/
void OLED_Display_Off(void)
{
    OLED_WR_Byte(0X8D,OLED_CMD);  //SET DCDC命令
    OLED_WR_Byte(0X10,OLED_CMD);  //DCDC OFF
    OLED_WR_Byte(0XAE,OLED_CMD);  //DISPLAY OFF
}    
/**********************************************
//清屏函数,清完屏,整个屏幕是黑色的!  
**********************************************/                    
void OLED_Clear(void)  
{  
    u8 i,n;            
    for(i=0;i<8;i++)  
    {  
        OLED_WR_Byte (0xb0+i,OLED_CMD);    //设置页地址（0~7）
        OLED_WR_Byte (0x00,OLED_CMD);      //设置显示位置—列低地址
        OLED_WR_Byte (0x10,OLED_CMD);      //设置显示位置—列高地址   
        for(n=0;n<128;n++)OLED_WR_Byte(0,OLED_DATA); 
    } //更新显示
}
/**********************************************
//亮屏函数，整个屏幕点亮!  
**********************************************/     
void OLED_On(void)  
{  
    u8 i,n;            
    for(i=0;i<8;i++)  
    {  
        OLED_WR_Byte (0xb0+i,OLED_CMD);    //设置页地址（0~7）
        OLED_WR_Byte (0x00,OLED_CMD);      //设置显示位置—列低地址
        OLED_WR_Byte (0x10,OLED_CMD);      //设置显示位置—列高地址   
        for(n=0;n<128;n++)OLED_WR_Byte(1,OLED_DATA); 
    } //更新显示
}
/**********************************************
//在指定位置显示一个字符,包括部分字符
//x:0~127
//y:0~63
//mode:0,反白显示;1,正常显示
//chr：要显示的字符         
//size:选择字体 16/12  
**********************************************/      
void OLED_ShowChar(u8 x,u8 y,u8 chr,u8 Char_Size)
{          
    unsigned char c=0,i=0;    
    c=chr-' ';//得到偏移后的值，为什么做偏移可查看 ASCII 表        
    if(x>Max_Column-1){x=0;y=y+2;}
    if(Char_Size ==16)
        {
            OLED_Set_Pos(x,y);    
            for(i=0;i<8;i++)
            OLED_WR_Byte(F8X16[c*16+i],OLED_DATA);
            OLED_Set_Pos(x,y+1);
            for(i=0;i<8;i++)
            OLED_WR_Byte(F8X16[c*16+i+8],OLED_DATA);
        }
        else 
        {    
            OLED_Set_Pos(x,y);
            for(i=0;i<6;i++)
            OLED_WR_Byte(F6x8[c][i],OLED_DATA);    
        }
}
/**********************************************
//m^n函数
**********************************************/      
u32 oled_pow(u8 m,u8 n)
{
    u32 result=1;     
    while(n--)result*=m;    
    return result;
}    
/**********************************************
//显示2个数字
//x:0~127
//y:0~63 
//num:数值(0~4294967295);
//len :数字的位数
//size:字体大小
**********************************************/                                   
void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size2)
{             
    u8 t,temp;
    u8 enshow=0;                           
    for(t=0;t<len;t++)
    {
        temp=(num/oled_pow(10,len-t-1))%10;
        if(enshow==0&&t<(len-1))
        {
            if(temp==0)
            {
                OLED_ShowChar(x+(size2/2)*t,y,' ',size2);
                continue;
            }
            else 
                enshow=1;      
        }
         OLED_ShowChar(x+(size2/2)*t,y,temp+'0',size2); 
    }
} 
/**********************************************
//显示一个字符号串
**********************************************/
void OLED_ShowString(u8 x,u8 y,u8 *chr,u8 Char_Size)
{
    unsigned char j=0;
    while (chr[j]!='\0')
    {        
        OLED_ShowChar(x,y,chr[j],Char_Size);
        x+=8;
        if(x>120){x=0;y+=2;}
        j++;
    }
}
/**********************************************
//显示汉字
**********************************************/
void OLED_ShowCHinese(u8 x,u8 y,u8 no)
{                      
    u8 t,adder=0;
    OLED_Set_Pos(x,y);    
    for(t=0;t<16;t++)
    {
        OLED_WR_Byte(Hzk[2*no][t],OLED_DATA);
        adder+=1;
     }    
    OLED_Set_Pos(x,y+1);    
    for(t=0;t<16;t++)
    {    
        OLED_WR_Byte(Hzk[2*no+1][t],OLED_DATA);
        adder+=1;
    }                    
}
/**********************************************
功能描述：显示显示BMP图片
//x0:0~127
//y0:0~63 
128×64起始点坐标(x,y)
**********************************************/
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_Set_Pos(x0,y);
        for(x=x0;x<x1;x++)
        {      
            OLED_WR_Byte(BMP[j++],OLED_DATA);            
        }
    }
} 
/**********************************************
//初始化SSD1306        
**********************************************/        
void OLED_Init(void)
{     
    OLED_WR_Byte(0xAE,OLED_CMD);//关闭显示    
    OLED_WR_Byte(0x40,OLED_CMD);//---set low column address
    OLED_WR_Byte(0xB0,OLED_CMD);//---set high column address
    OLED_WR_Byte(0xC8,OLED_CMD);//-not offset
    
    OLED_WR_Byte(0x81,OLED_CMD);//设置对比度
    OLED_WR_Byte(0xff,OLED_CMD);

    OLED_WR_Byte(0xa1,OLED_CMD);//段重定向设置
    OLED_WR_Byte(0xa6,OLED_CMD);//
    
    OLED_WR_Byte(0xa8,OLED_CMD);//设置驱动路数
    OLED_WR_Byte(0x1f,OLED_CMD);
    
    OLED_WR_Byte(0xd3,OLED_CMD);
    OLED_WR_Byte(0x00,OLED_CMD);
    
    OLED_WR_Byte(0xd5,OLED_CMD);
    OLED_WR_Byte(0xf0,OLED_CMD);
    
    OLED_WR_Byte(0xd9,OLED_CMD);
    OLED_WR_Byte(0x22,OLED_CMD);
    
    OLED_WR_Byte(0xda,OLED_CMD);
    OLED_WR_Byte(0x02,OLED_CMD);
    
    OLED_WR_Byte(0xdb,OLED_CMD);
    OLED_WR_Byte(0x49,OLED_CMD);
    
    OLED_WR_Byte(0x8d,OLED_CMD);
    OLED_WR_Byte(0x14,OLED_CMD);
    
    OLED_WR_Byte(0xaf,OLED_CMD);
    OLED_Clear();
}

字库文件
oledfont.h 文件
$colorred注意：不要遗漏该文件，或者自己制作字库！！！$

#ifndef __OLEDFONT_H
#define __OLEDFONT_H        
//常用ASCII表
//偏移量32
//ASCII字符集
//偏移量32
//大小:12*6
/************************************6*8的点阵************************************/
const unsigned char F6x8[][6] =        
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// sp
0x00, 0x00, 0x00, 0x2f, 0x00, 0x00,// !
0x00, 0x00, 0x07, 0x00, 0x07, 0x00,// "
0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14,// #
0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12,// $
0x00, 0x62, 0x64, 0x08, 0x13, 0x23,// %
0x00, 0x36, 0x49, 0x55, 0x22, 0x50,// &
0x00, 0x00, 0x05, 0x03, 0x00, 0x00,// '
0x00, 0x00, 0x1c, 0x22, 0x41, 0x00,// (
0x00, 0x00, 0x41, 0x22, 0x1c, 0x00,// )
0x00, 0x14, 0x08, 0x3E, 0x08, 0x14,// *
0x00, 0x08, 0x08, 0x3E, 0x08, 0x08,// +
0x00, 0x00, 0x00, 0xA0, 0x60, 0x00,// ,
0x00, 0x08, 0x08, 0x08, 0x08, 0x08,// -
0x00, 0x00, 0x60, 0x60, 0x00, 0x00,// .
0x00, 0x20, 0x10, 0x08, 0x04, 0x02,// /
0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
0x00, 0x00, 0x42, 0x7F, 0x40, 0x00,// 1
0x00, 0x42, 0x61, 0x51, 0x49, 0x46,// 2
0x00, 0x21, 0x41, 0x45, 0x4B, 0x31,// 3
0x00, 0x18, 0x14, 0x12, 0x7F, 0x10,// 4
0x00, 0x27, 0x45, 0x45, 0x45, 0x39,// 5
0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
0x00, 0x01, 0x71, 0x09, 0x05, 0x03,// 7
0x00, 0x36, 0x49, 0x49, 0x49, 0x36,// 8
0x00, 0x06, 0x49, 0x49, 0x29, 0x1E,// 9
0x00, 0x00, 0x36, 0x36, 0x00, 0x00,// :
0x00, 0x00, 0x56, 0x36, 0x00, 0x00,// ;
0x00, 0x08, 0x14, 0x22, 0x41, 0x00,// <
0x00, 0x14, 0x14, 0x14, 0x14, 0x14,// =
0x00, 0x00, 0x41, 0x22, 0x14, 0x08,// >
0x00, 0x02, 0x01, 0x51, 0x09, 0x06,// ?
0x00, 0x32, 0x49, 0x59, 0x51, 0x3E,// @
0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C,// A
0x00, 0x7F, 0x49, 0x49, 0x49, 0x36,// B
0x00, 0x3E, 0x41, 0x41, 0x41, 0x22,// C
0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C,// D
0x00, 0x7F, 0x49, 0x49, 0x49, 0x41,// E
0x00, 0x7F, 0x09, 0x09, 0x09, 0x01,// F
0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A,// G
0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F,// H
0x00, 0x00, 0x41, 0x7F, 0x41, 0x00,// I
0x00, 0x20, 0x40, 0x41, 0x3F, 0x01,// J
0x00, 0x7F, 0x08, 0x14, 0x22, 0x41,// K
0x00, 0x7F, 0x40, 0x40, 0x40, 0x40,// L
0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F,// M
0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F,// N
0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E,// O
0x00, 0x7F, 0x09, 0x09, 0x09, 0x06,// P
0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
0x00, 0x7F, 0x09, 0x19, 0x29, 0x46,// R
0x00, 0x46, 0x49, 0x49, 0x49, 0x31,// S
0x00, 0x01, 0x01, 0x7F, 0x01, 0x01,// T
0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F,// U
0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F,// V
0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F,// W
0x00, 0x63, 0x14, 0x08, 0x14, 0x63,// X
0x00, 0x07, 0x08, 0x70, 0x08, 0x07,// Y
0x00, 0x61, 0x51, 0x49, 0x45, 0x43,// Z
0x00, 0x00, 0x7F, 0x41, 0x41, 0x00,// [
0x00, 0x55, 0x2A, 0x55, 0x2A, 0x55,// 55
0x00, 0x00, 0x41, 0x41, 0x7F, 0x00,// ]
0x00, 0x04, 0x02, 0x01, 0x02, 0x04,// ^
0x00, 0x40, 0x40, 0x40, 0x40, 0x40,// _
0x00, 0x00, 0x01, 0x02, 0x04, 0x00,// '
0x00, 0x20, 0x54, 0x54, 0x54, 0x78,// a
0x00, 0x7F, 0x48, 0x44, 0x44, 0x38,// b
0x00, 0x38, 0x44, 0x44, 0x44, 0x20,// c
0x00, 0x38, 0x44, 0x44, 0x48, 0x7F,// d
0x00, 0x38, 0x54, 0x54, 0x54, 0x18,// e
0x00, 0x08, 0x7E, 0x09, 0x01, 0x02,// f
0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C,// g
0x00, 0x7F, 0x08, 0x04, 0x04, 0x78,// h
0x00, 0x00, 0x44, 0x7D, 0x40, 0x00,// i
0x00, 0x40, 0x80, 0x84, 0x7D, 0x00,// j
0x00, 0x7F, 0x10, 0x28, 0x44, 0x00,// k
0x00, 0x00, 0x41, 0x7F, 0x40, 0x00,// l
0x00, 0x7C, 0x04, 0x18, 0x04, 0x78,// m
0x00, 0x7C, 0x08, 0x04, 0x04, 0x78,// n
0x00, 0x38, 0x44, 0x44, 0x44, 0x38,// o
0x00, 0xFC, 0x24, 0x24, 0x24, 0x18,// p
0x00, 0x18, 0x24, 0x24, 0x18, 0xFC,// q
0x00, 0x7C, 0x08, 0x04, 0x04, 0x08,// r
0x00, 0x48, 0x54, 0x54, 0x54, 0x20,// s
0x00, 0x04, 0x3F, 0x44, 0x40, 0x20,// t
0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C,// u
0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C,// v
0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C,// w
0x00, 0x44, 0x28, 0x10, 0x28, 0x44,// x
0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C,// y
0x00, 0x44, 0x64, 0x54, 0x4C, 0x44,// z
0x14, 0x14, 0x14, 0x14, 0x14, 0x14,// horiz lines
};
/****************************************8*16的点阵************************************/
const unsigned char F8X16[]=      
{
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,// 0
  0x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,//! 1
  0x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//" 2
  0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,//# 3
  0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,//$ 4
  0xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,//% 5
  0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,//& 6
  0x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//' 7
  0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,//( 8
  0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,//) 9
  0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,//* 10
  0x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,//+ 11
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,//, 12
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,//- 13
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,//. 14
  0x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,/// 15
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,//0 16
  0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//1 17
  0x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,//2 18
  0x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,//3 19
  0x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,//4 20
  0x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,//5 21
  0x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,//6 22
  0x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,//7 23
  0x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,//8 24
  0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,//9 25
  0x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,//: 26
  0x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,//; 27
  0x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,//< 28
  0x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,//= 29
  0x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,//> 30
  0x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,//? 31
  0xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,//@ 32
  0x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,//A 33
  0x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,//B 34
  0xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,//C 35
  0x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,//D 36
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,//E 37
  0x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,//F 38
  0xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,//G 39
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,//H 40
  0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//I 41
  0x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,//J 42
  0x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,//K 43
  0x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,//L 44
  0x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,//M 45
  0x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,//N 46
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,//O 47
  0x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,//P 48
  0xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,//Q 49
  0x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,//R 50
  0x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,//S 51
  0x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//T 52
  0x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//U 53
  0x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,//V 54
  0xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,//W 55
  0x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,//X 56
  0x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//Y 57
  0x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,//Z 58
  0x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,//[ 59
  0x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,//\ 60
  0x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,//] 61
  0x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//^ 62
  0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,//_ 63
  0x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//` 64
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,//a 65
  0x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,//b 66
  0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,//c 67
  0x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,//d 68
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,//e 69
  0x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//f 70
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,//g 71
  0x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//h 72
  0x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//i 73
  0x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,//j 74
  0x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,//k 75
  0x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//l 76
  0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,//m 77
  0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//n 78
  0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//o 79
  0x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,//p 80
  0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,//q 81
  0x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,//r 82
  0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,//s 83
  0x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,//t 84
  0x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,//u 85
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,//v 86
  0x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,//w 87
  0x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,//x 88
  0x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,//y 89
  0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,//z 90
  0x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,//{ 91
  0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,//| 92
  0x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,//} 93
  0x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//~ 94
};
char Hzk[][32]={

{0x00,0x00,0xF0,0x10,0x10,0x10,0x10,0xFF,0x10,0x10,0x10,0x10,0xF0,0x00,0x00,0x00},
{0x00,0x00,0x0F,0x04,0x04,0x04,0x04,0xFF,0x04,0x04,0x04,0x04,0x0F,0x00,0x00,0x00},/*"中",0*/

{0x40,0x40,0x40,0x5F,0x55,0x55,0x55,0x75,0x55,0x55,0x55,0x5F,0x40,0x40,0x40,0x00},
{0x00,0x40,0x20,0x0F,0x09,0x49,0x89,0x79,0x09,0x09,0x09,0x0F,0x20,0x40,0x00,0x00},/*"景",1*/

{0x00,0xFE,0x02,0x42,0x4A,0xCA,0x4A,0x4A,0xCA,0x4A,0x4A,0x42,0x02,0xFE,0x00,0x00},
{0x00,0xFF,0x40,0x50,0x4C,0x43,0x40,0x40,0x4F,0x50,0x50,0x5C,0x40,0xFF,0x00,0x00},/*"园",2*/

{0x00,0x00,0xF8,0x88,0x88,0x88,0x88,0xFF,0x88,0x88,0x88,0x88,0xF8,0x00,0x00,0x00},
{0x00,0x00,0x1F,0x08,0x08,0x08,0x08,0x7F,0x88,0x88,0x88,0x88,0x9F,0x80,0xF0,0x00},/*"电",3*/

{0x80,0x82,0x82,0x82,0x82,0x82,0x82,0xE2,0xA2,0x92,0x8A,0x86,0x82,0x80,0x80,0x00},
{0x00,0x00,0x00,0x00,0x00,0x40,0x80,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"子",4*/

{0x24,0x24,0xA4,0xFE,0xA3,0x22,0x00,0x22,0xCC,0x00,0x00,0xFF,0x00,0x00,0x00,0x00},
{0x08,0x06,0x01,0xFF,0x00,0x01,0x04,0x04,0x04,0x04,0x04,0xFF,0x02,0x02,0x02,0x00},/*"科",5*/

{0x10,0x10,0x10,0xFF,0x10,0x90,0x08,0x88,0x88,0x88,0xFF,0x88,0x88,0x88,0x08,0x00},
{0x04,0x44,0x82,0x7F,0x01,0x80,0x80,0x40,0x43,0x2C,0x10,0x28,0x46,0x81,0x80,0x00},/*"?",0*/

{0x40,0x40,0x48,0x48,0x48,0xC8,0x78,0x4F,0x48,0x48,0x48,0x48,0x48,0x40,0x40,0x00},
{0x00,0x00,0x00,0x00,0x03,0x12,0x12,0x22,0x22,0x52,0x8A,0x06,0x00,0x00,0x00,0x00},/*"专",0*/

{0x00,0x10,0x60,0x80,0x00,0xFF,0x00,0x00,0x00,0xFF,0x00,0x00,0xC0,0x30,0x00,0x00},
{0x40,0x40,0x40,0x43,0x40,0x7F,0x40,0x40,0x40,0x7F,0x42,0x41,0x40,0x40,0x40,0x00},/*"业",1*/

{0x10,0x10,0x10,0xFF,0x10,0x90,0x08,0x88,0x88,0x88,0xFF,0x88,0x88,0x88,0x08,0x00},
{0x04,0x44,0x82,0x7F,0x01,0x80,0x80,0x40,0x43,0x2C,0x10,0x28,0x46,0x81,0x80,0x00},/*"技",2*/

{0x00,0x10,0x10,0x10,0x10,0xD0,0x30,0xFF,0x30,0xD0,0x12,0x1C,0x10,0x10,0x00,0x00},
{0x10,0x08,0x04,0x02,0x01,0x00,0x00,0xFF,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x00},/*"术",3*/

{0x00,0x00,0xFE,0x22,0x22,0x22,0xFE,0x00,0xFE,0x82,0x82,0x92,0xA2,0x9E,0x00,0x00},
{0x80,0x60,0x1F,0x02,0x42,0x82,0x7F,0x00,0xFF,0x40,0x2F,0x10,0x2C,0x43,0x80,0x00},/*"服",4*/

{0x00,0x00,0x90,0x88,0x4C,0x57,0xA4,0x24,0x54,0x54,0x8C,0x84,0x00,0x00,0x00,0x00},
{0x01,0x01,0x80,0x42,0x22,0x1A,0x07,0x02,0x42,0x82,0x42,0x3E,0x01,0x01,0x01,0x00},/*"务",5*/

{0x00,0x04,0xE4,0x24,0x2C,0xB4,0x25,0x26,0x24,0xB4,0x2C,0x24,0xE4,0x04,0x00,0x00},
{0x00,0x00,0xFF,0x02,0x01,0x1E,0x12,0x12,0x12,0x1E,0x41,0x82,0x7F,0x00,0x00,0x00},/*"商",6*/

};

#endif

主函数 main.c

#include "gd32f4xx.h"
#include "systick.h"
#include <stdio.h>

#include "gpio.h"
#include "uart.h"
#include "iic.h"
#include "oled.h"
#include "bmp.h"



int main(void)
{
    systick_config();    //配置系统时钟
    
    GPIO_Init();
    USART_Init();
    IIC_Init();
    OLED_Init();
    while(1) 
    {
        gpio_bit_toggle(GPIOC, GPIO_PIN_6);    //反转PC6
        delay_1ms(200);
        
        USART_TransmitString("这是一个串口测试\r\n");
        
        printf("串口重定向测试\r\n");
        
        OLED_Clear();
        OLED_Clear();
        OLED_ShowString(0,0,"Stark",16);
        OLED_ShowString(0,2,"Stark-RISCV",16);
        delay_1ms(500);
        OLED_Clear();

    }
}

硬件软件的驱动方式都有，具体内容详看代码部分，软件和硬件IIC的选择在 oled.h 文件中配置，

#define S_I2C     1//1:软件IIC模式    0：硬件IIC模式

显示效果