GD32F103 硬件 IIC

1. 硬件IIC

1. 硬件IIC的框图

如果MCU做为主机SCL就做为输出，做从机SCL就做为输入。

主机：

当MCU作为主机发送数据流程从数据缓冲寄存器里拿到移位寄存器。在从移位寄存器一位一位发送。

当MCU作为主机接收数据流程先放到移位寄存器。在从移位寄存器放到数据缓冲寄存器。然后读取即可。读取的是一个字节。

从机：对主机发送的地址进行判断。CRC计算/校验。

2. 7位地址与10位地址。

对于10位地址分两次发。7位地址一次就可以了。

3. 多个主机问题。

CLK2的决定（以低电平为准）线与功能。

主机2SDA发起。主机1靠边站。

4. 具体的寄存器

2. OLED介绍

1. OLED的简介

2. OLED IIC通信配置。

首先OLED要选择通信模式。可以IIC,SPI通信。

把 BS0，BS1,BS2分别设置成 0,1,0就是选择IIC通信。

64行分成8页。相当于一页有8行。

一页。6行来显色。

3. dome （硬件IIC读取LM75以及OLED）

1. OLED的唯一地址。（查手册）

2. 主机发送的流程。（数据手册）

1. 首先，软件应该使能 I2C 外设时钟，以及配置 I2C_CTL1 中时钟相关寄存器来确保正确

的 I2C 时序。使能和配置以后， I2C 运行在默认的从机模式状态，等待 START 信号，随

后等待I2C总线寻址。

2. 软件将START位置1，在I2C总线上产生一个START信号。

3. 发送一个START信号后，l2C硬件将I2C_STATO的SBSEND位置1然后进入主机模式。现

在软件应该读I2C STATO寄存器然后写一个7位地址位或10位地址的地址头到I2C DATA

寄存器来清除SBSEND位。当SBSEND位被清O时，I2C就开始发送地址或者地址头到I2C

总线。如果发送的地址是10位地址的地址头，硬件在发送地址头的时候会将ADD10SEND

位置1，软件应该通过读I2C STATO寄存器然后写10位低地址到I2C DATA来清除

ADD10SEND位。

4. 7位或10位的地址位发送出去之后，I2C硬件将ADDSEND位置1，软件通过读I2C_STAT0

寄存器然后读l2C_STAT1寄存器清除ADDSEND位。

5. l2C进入数据发送状态，因为移位寄存器和数据寄存器I2C DATA都是空的，所以硬件将

TBE位置1。此时软件可以写第一个字节数据到I2C DATA寄存器，但是TBE位此时不会被

清零，因为写入I2C DATA寄存器的字节会被立即移入内部移位寄存器。当移位寄存器非

空时，12C就开始发送数据到总线。

6. 在第一个字节的发送过程中，软件可以写第二个字节到I2C_DATA，此时TBE会被清零，

因为I2C_DATA寄存器和移位寄存器都不为空。

7. 任意时刻TBE被置1，软件都可以向I2C_DATA寄存器写入一个字节，只要还有数据待发送。

8. 在倒数第二个字节发送过程中，软件写入最后一个字节数据到I2C DATA来清除TBE标志

位，此后就不用关心TBE位的状态。TBE位会在倒数第二个字节发送完成后被置起，直到

发送STOP信号时被清零。

最后一个字节发送结束后，I2C主机将BTC位置起，因为移位寄存器和I2C DATA寄存器此时都

为空。软件此时应该配置STOP来发送一个STOP信号，此后TBE和BTC状态位都将被清0。

3. 主机接收的流程。（数据手册）

在主机接收模式下，主机需要为最后一个字节接收产生 NACK ，然后发送 STOP 信号。因此，需

要特别注意以确保最后接收到数据的正确性。

1. 首先，软件应该使能l2C外设时钟，以及配置I2C_CTL1中时钟相关寄存器来确保正确的

12C时序。使能和配置以后，I2C运行在默认的从机模式状态，等待START信号，随后等待

I2C总线寻址。

2. 软件将START位置1，从而在I2C总线上产生一个START信号。

3. 发送一个START信号后，I2C硬件将I2C STATO寄存器的SBSEND位置1然后进入主机模

式。现在软件应该读I2C STATO寄存器然后写一个7位地址位或10位地址的地址头到

I2C_DATA寄存器来清除SBSEND位。当SBSEND位被清O时，I2C就开始发送地址或者地

址头到I2C总线。如果发送的地址是10位地址的地址头，硬件在发送地址头的时候会先将

ADD10SEND 位置 1 ，软件应该通过读 I2C_STAT0 寄存器然后写 10 位低地址到 I2C_DATA

来清除 ADD10SEND 位。

4. 7 位或 10 位的地址位发送出去之后， I2C 硬件将 ADDSEND 位置 1 ，软件应该通过读

I2C_STAT0 寄存器然后读 I2C_STAT1 寄存器清除 ADDSEND 位。如果地址是 10 位格式，软

件应该再次将 START 位置 1 来重新产生一个 START 。在 START 产生后， SBSEND 位会被置

1 。软件应该通过先读 I2C_STAT0 然后写地址头到 I2C_DATA 来清除 SBSEND 位，然后地

址头被发到 I2C 总线， ADDSEND 再次被置 1 。软件应该再次通过先读 I2C_STAT0 然后读

I2C_STAT1 来清除 ADDSEND 位。

5. 当接收到第一个字节时，硬件会将 RBNE 位置 1 。此时软件可以从 I2C_DATA 寄存器读取第

一个字节，之后 RBNE 位被清 0 。

6. 此后任何时候 RBNE 被置 1 ，软件就可以从 I2C_DATA 寄存器读取一个字节。

7. 接收完倒数第二个字节（ N-1 ）数据之后，软件应该立即将 ACKEN 位清 0 ，并将 STOP 位置

1 ，这一过程需要在最后一个字节接收完毕之前完成，以确保 NACK 发送给最后一个字节。

8. 最后一个字节接收完毕后， RBNE 位被置 1 ，软件可以读取最后一个字节。由于 ACKEN 已

经在前一步骤中被清 0 ， I2C 不再为最后一个字节发送 ACK ，并在最后一个字节发送完毕后

产生一个 STOP 信号。

以上步骤要求字节数目 N>1 ，如果 N=1 ，步骤 7 应该在步骤 4 之后就执行，且需要在字节接收完

成之前完成。

4. 代码实现

lm75a_temp.h

#ifndef __LM75A_TEMP_H
#define __LM75A_TEMP_H

#include "gd32f10x.h"
#include "i2c.h"

#define LM75A_I2C_ADDR  0x9E   //LM75A的唯一从机地址

#define LM75A_TEMP_REG  0x00   /* 温度寄存器的指针地址 */
#define LM75A_CONF_REG  0x01   /* 配置寄存器（Conf）*/
#define LM75A_THYST_REG 0x10   /* 滞后寄存器（Thyst） */
#define LM75A_TOS_REG   0x11   /* 过热关断寄存器（Tos） */



float lm75a_get_temp(void);     //获取温度传感器的温度值

void lm75a_read_temp_reg(uint8_t lm75a_id, uint8_t *p);  //读温度寄存器的值

#endif

lm75a_temp.c

#include "lm75a_temp.h"

// 读温度传感器的温度寄存器的值并转换为温度值
float lm75a_get_temp(void){
	float temp_result;
	//读温度寄存器值
	uint8_t byte_data[2];
	lm75a_read_temp_reg(LM75A_I2C_ADDR, byte_data);
	
	//将温度寄存器值转为温度值
	uint16_t temp_reg = byte_data[0]<<3 | byte_data[1]>>5;
	
	if((temp_reg & 0x0400) == 0){
		temp_result = temp_reg * 0.125;
	}else{
		temp_reg = (~((temp_reg&0x03ff)-1)) & 0x03ff;    //补码到原码转换
		temp_result = temp_reg * (-0.125);
	}
	
	return temp_result;
}



/***
功能：读温度寄存器的值
输入：
	uint8_t lm75a_id： lm75a的iic从机地址
	uint8_t *p：读取结果存放的位置
返回：无
*****/
void lm75a_read_temp_reg(uint8_t lm75a_id, uint8_t *p){
	/******给LM75A写温度寄存器的指针字节********/   // 使用了I2C0（主模式）写功能，
  
	while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));    // 如果I2C0繁忙，空等
  
	i2c_start_on_bus(I2C0);                        // 在I2C0上生成一个起始位
	while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));   // 如果起始位还没有发送，空等
  
	i2c_master_addressing(I2C0, lm75a_id, I2C_TRANSMITTER); //发送地址，发送模式
	while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND));  // 如果地址还没有发送，空等
  
	i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND);   /* 清除I2C_FLAG_ADDSEND标志位 */
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_TBE)); // I2C_FLAG_TBE标志是否空闲
	i2c_data_transmit(I2C0, LM75A_TEMP_REG);  // 发送温度传感器的地址
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_TBE)); // I2C_FLAG_TBE标志是否空闲
	i2c_stop_on_bus(I2C0);                    // 停止信号
  
	while(I2C_CTL0(I2C0) & 0x20);             // 判断STOP是否发送完成
	
	/******读LM75A温度寄存器里面的两个字节的值********/  //使用了I2C0（主模式）读功能
	i2c_ackpos_config(I2C0, I2C_ACKPOS_NEXT);        //设置应答的位置配置 (下一个）
	
	while(i2c_flag_get(I2C0, I2C_FLAG_I2CBSY));    // 如果I2C0繁忙，空等
  
	i2c_start_on_bus(I2C0);                        // 在I2C0上生成一个起始位
	while(!i2c_flag_get(I2C0, I2C_FLAG_SBSEND));   // 如果起始位还没有发送，空等
  
	i2c_master_addressing(I2C0, lm75a_id, I2C_RECEIVER); //发送地址，接收模式
  
	i2c_ack_config(I2C0, I2C_ACK_DISABLE); /* 从机是否发送ACK应答 */
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_ADDSEND)); /* 地址是否发送完成 */
  
	i2c_flag_clear(I2C0, I2C_FLAG_ADDSEND); /* 清除I2C_FLAG_ADDSEND标志位 */
	
	//从I2C_DATA读值
	while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));     // 字节是否传输完成 
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_RBNE));    // 如果I2C_DATA为空，空等
	*p = i2c_data_receive(I2C0);
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_RBNE));    // 如果I2C_DATA为空，空等
	*(p+1) = i2c_data_receive(I2C0); 
  
	i2c_stop_on_bus(I2C0);
	while(I2C_CTL0(I2C0) & 0x200);
	
	i2c_ackpos_config(I2C0, I2C_ACKPOS_CURRENT);        // 重新设置应答的位置
	i2c_ack_config(I2C0, I2C_ACK_ENABLE);
}

oled_i2c.h

#ifndef __OLED_H
#define __OLED_H

#include "gd32f10x.h"
#include "i2c.h"

#define OLED_I2C_ADDR      0x78

#define OLED_I2C_CMD_ADDR  0x00
#define OLED_I2C_DATA_ADDR 0x40

#define MAX_COLUMN 132

void i2c_write_byte(uint8_t i2c_addr, uint8_t i2c_data);

void oled_write_command(uint8_t oled_cmd); 
void oled_write_data(uint8_t oled_data); 

void oled_init(void);

void oled_display_white(void);							// OLED 白屏显示
void oled_clear_all(void);								  // OLED 清屏显示
void oled_fill(uint8_t fill_data);                      // 单一色度填充OLED屏

void oled_set_pos(uint8_t x, uint8_t y);                // 设置坐标
void oled_show_char(uint8_t x, uint8_t y, uint8_t chr, uint8_t char_size);    // 显示字符
void oled_show_string(uint8_t x, uint8_t y, uint8_t *str, uint8_t char_size); // 显示字符串


void oled_show_error(uint8_t x, uint16_t y, uint8_t *err);                    // 显示错误提示
	
#endif

oled_i2c.c

#include "oled_i2c.h"
#include "oled_font.h"

/**
* 功能：
* 输入：
*     1）uint8_t i2c_addr, 
*     2）uint8_t i2c_data

**/
void i2c_write_byte(uint8_t i2c_addr, uint8_t i2c_data){
	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, OLED_I2C_ADDR, 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(命令或者数据地址)
	i2c_data_transmit(I2C0, i2c_addr);
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
	i2c_data_transmit (I2C0, i2c_data);  // (要发的命令或者数据指令的具体数据)
  
	while(!i2c_flag_get(I2C0, I2C_FLAG_BTC));
	i2c_stop_on_bus (I2C0);
  
	while(I2C_CTL0(I2C0)&0x0200);
}

/**
* 功能：
* 输入：oled_cmd：oled的控制命令
**/
void oled_write_command(uint8_t oled_cmd){
	i2c_write_byte(OLED_I2C_CMD_ADDR, oled_cmd); 
}

/**
* 功能：
* 输入：oled_data：要发送给oled的数据
**/
void oled_write_data(uint8_t oled_data){
	i2c_write_byte(OLED_I2C_DATA_ADDR, oled_data); 
}

/**
* 功能：
* 输入：无
**/
void oled_init(void){
	oled_write_command(0xAE);// 0xAE:关显示，0xAF:开显示
	
	oled_write_command(0x00);// 设置开始地址的低字节       
	oled_write_command(0x10);// 设置开始地址的高字节
	
	oled_write_command(0xd5);// 命令头，设置显示时钟分频比/振荡器频率
	oled_write_command(0x80);// 设置分割比率，设置时钟为100帧/秒
	
	oled_write_command(0xa8);// 命令头，设置多路复用率(1 to 64)
	oled_write_command(0x3f);// --1/64 duty
	
	oled_write_command(0xd3);// 命令头，设置显示偏移移位映射RAM计数器(0x00~0x3F)
	oled_write_command(0x00);// 不偏移
	
	oled_write_command(0x00);// 写入页位置（0xB0~7）
	oled_write_command(0x40);// 显示开始线
	
	oled_write_command(0x8d);// VCC电源
	oled_write_command(0x14);// --set(0x10) disable
	
	oled_write_command(0xa1);// 设置段重新映射
	oled_write_command(0xc8);// 设置Y轴扫描方向，0xc0上下反置 ，0xc8正常（上边为0行）
	
	oled_write_command(0xda);// 命令头，--set com pins hardware configuration
	oled_write_command(0x12);
	
	oled_write_command(0x81);// 对比度，指令：0x81，数据：0~255（255最高）
	oled_write_command(0xff);
	
	oled_write_command(0xd9);// 命令头，--set pre-charge period
	oled_write_command(0xf1);// Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
	
	oled_write_command(0xdb);// 命令头，--set vcomh
	oled_write_command(0x30);// Set VCOM Deselect Level
	
	oled_write_command(0x20);// 水平寻址设置
	oled_write_command(0x00);
	
	oled_write_command(0xa4);// 0xa4:正常显示，0xa5:整体点亮
	oled_write_command(0xa6);// 0xa6:正常显示，0xa7:反色显示
	
	oled_write_command(0xAF);// 0xAE:关显示，0xAF:开显示
}

// OLED显示单一色度
void oled_fill(uint8_t fill_data){
	uint8_t i=0, n;
	for(i = 0; i < 8; i++){
		oled_write_command (0xB0+i);    //设置页地址（0~7）
		oled_write_command (0x00);      //设置显示位置—列低地址
		oled_write_command (0x10);      //设置显示位置—列高地址  		
		for(n = 0; n < 132; n++){
			oled_write_data(fill_data);
		}
	}
}

// OLED 白屏显示
void oled_display_white(void){
	oled_fill(0xFF);
}

// OLED 清屏显示
void oled_clear_all(void){

	oled_fill(0x00);
}

// OLED打开
void oled_on(){
	oled_write_command(0xAF);  // 开启显示
	oled_write_command(0x8D);  // 设置电荷泵
	oled_write_command(0x14);  // 开启电荷泵
}

// OLED关闭
void oled_off(){
	oled_write_command(0xAF);  // 开启显示
	oled_write_command(0x8D);  // 设置电荷泵
	oled_write_command(0x10);  // 关闭电荷泵
}

// OLED设置显示位置
void oled_set_pos(uint8_t x, uint8_t y){
	oled_write_command(0xB0 + y);
	oled_write_command((x & 0xf0) >> 4 | 0x10 );
	oled_write_command((x & 0x0f) | 0x01 );
}



// 显示char字符
void oled_show_char(uint8_t x, uint8_t y, uint8_t chr, uint8_t char_size){
	uint8_t c_index = 0, i = 0;
	
	c_index = chr - ' ';  // 获取chr在字模数组中的序号
	if(char_size == 16){
		if(x > MAX_COLUMN - 8){ //如果超出了屏幕的显示宽度，则换到下一行重新开始
			x = 0;
			y += 2;
		}
		oled_set_pos(x, y);
		for(i = 0; i < 8; i++){
			oled_write_data(F8X16[c_index*16 + i]);
		}
		oled_set_pos(x, y+1);
		for(i = 0; i < 8; i++){
			oled_write_data(F8X16[c_index*16 + i + 8]);
		}
	}else if(char_size == 8){
		if(x > MAX_COLUMN - 6){ //如果超出了屏幕的显示宽度，则换到下一行重新开始
			x = 0;
			y += 1;
		}
		oled_set_pos(x, y);
		for(i = 0; i < 6; i++){
			oled_write_data(F6x8[c_index][i]);
		}
	}else{
		oled_show_error(x, y, (uint8_t *)"wrong char_size setted.");
	}
}

// 显示字符串
void oled_show_string(uint8_t x, uint8_t y, uint8_t *str, uint8_t char_size){
	uint8_t i = 0;
	while(str[i] != '\0'){
		oled_show_char(x, y, str[i], char_size);
		if(char_size == 16){
			x += 8;
			if(x > MAX_COLUMN - 8){
				x = 0;
				y += 2;
			}
		}else if(char_size == 8){
			x += 6;
			if(x > MAX_COLUMN - 8){
				x = 0;
				y += 1;
			}
		}
		i++;
	}
}

// 在(x,y)处显示“error!”信息
void oled_show_error(uint8_t x, uint16_t y, uint8_t *err){
	oled_show_string(x, y, err, 16);
}

oled_font.h

#ifndef __OLED_FONT_H
#define __OLED_FONT_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
};

#endif

main.c

#include <stdio.h>
#include "systick.h"
#include "usart_comm.h"
#include "i2c.h"
#include "lm75a_temp.h"
#include "oled_i2c.h"

int main(){
	systick_config();
	i2c_init();
	
	oled_init();
	oled_clear_all();
	oled_show_string(24, 0, (uint8_t *)"hello", 16);
	float temp_result = 0.0;
	char temp_string[80]; 

	while(1){
		  temp_result = lm75a_get_temp(); /* 获取温度 */
		  sprintf(temp_string, "temperature is: %.3f C.", temp_result);
		  oled_show_string(0, 2, (uint8_t *)temp_string, 16); /* 显示到OLED */
		  delay_1ms(1000);  //等待1s
	}
}

OLED具体初始化设置看手册。