STM32F103C8T6移植U8g2图形库及基于I2C协议的OLED显示（HAL库方式）【U8g2】【STM32开发板】【STM32CubeMX】
实验说明
利用STM32F103的GPIO管脚、VCC和GND连接OLED屏的I2C接口，采用CubeMX设计一个HAL库程序框架，然后下载U8g2源码，针对STM32F103和0.96寸的I2C接口OLED屏，进行代码裁剪，然后移植到HAL程序程序中，完成OLED的显示。
关于U8g2
U8g2是什么
U8g2是GitHub上一款十分优秀的开源图形库（GUI库），其本质是嵌入式设备的单色图形库。在 Github 上超过3.2K Star，2.6K Commit。其开发语言90%为C语言，且代码简洁干练便于移植与后期修改。
U8g2支持的显示控制器
U8g2支持单色OLED和LCD，包括以下控制器：SSD1305, SSD1306, SSD1309, SSD1312, SSD1316, SSD1320, SSD1322, SSD1325, SSD1327, SSD1329, SSD1606, SSD1607, SH1106, SH1107, SH1108, SH1122, T6963, RA8835, LC7981, PCD8544, PCF8812, HX1230, UC1601, UC1604, UC1608, UC1610, UC1611, UC1617, UC1638, UC1701, ST7511, ST7528, ST7565, ST7567, ST7571, ST7586, ST7588, ST75256, ST75320, NT7534, ST7920, IST3020, IST7920, LD7032, KS0108, KS0713, HD44102, T7932, SED1520, SBN1661, IL3820, MAX7219。（可以看出适配的驱动IC是非常多的，考虑到后续U8g2图形库继续维护升级可能会支持更多控制器）
可以说，基本上主流的显示控制器都支持，比如我们常见的SSD1306等，读者在使用该库之前请查阅自己的OLED显示控制器是否处于支持列表中。
U8g2的优势
U8g2库平台支持性好，基本上支持绝大部分Arduino与STM32开发板，也包含物联网比较常用的esp8266；
U8g2库显示控制器支持性好，基本上市面上的OLED都完美支持；
U8g2库API函数众多，特别支持了中文，支持了不同字体，这是一个对于开发者俩说不小的福利；
U8g2库移植简单，容易使用。
STM32CubeMX配置
RCC配置：设置高速时钟 (HSE) 为晶振 (Crystal Resonator) 。
SYS配置：设置Debug为串行线 (Serial Wire) 。
I2C2配置：设置I2C为I2C。
TIM1配置：设置时钟源 (Clock Source) 为内部时钟 (Internal Clock) ，并在Parameter Settings中设置预分频系数 (Prescaler) 为71。计数周期 (Counter Period) 保持默认的65535不变。
时钟配置 (Clock Configuration) ：
配置以上参数后，生成Keil工程即可。
U8g2移植
U8g2源码下载
U8g2下载地址：https://github.com/olikraus/u8g2
进入源码地址后下载整个U8g2图形库的压缩包。
精简U8g2源码
U8g2支持多种显示驱动的屏幕，因为源码中包含了各个驱动对应的文件，为减小整个工程的代码体积，在移植U8g2时，可以删除一些无用的文件。
打开csrc文件夹，找到所有u8x8_d_开头的c文件。本次实验使用ssd1306驱动的128×64分辨率的OLED，因此需要u8x8_d_ssd1306_128x64_noname.c这个文件，其它屏幕驱动和分辨率的文件可以删除。
精简u8g2_d_setup：本次实验用的OLED是I2C接口，因此保留u8g2_Setup_ssd1306_i2c_128x64_noname_f这个函数即可，其它函数可以删除或注释。
精简u8g2_d_memory：u8g2_Setup_ssd1306_i2c_128x64_noname_f函数中，只调用了u8g2_m_16_8_f这个函数，所以留下这个函数，其它的函数一定要删掉或注释掉，否则编译时很可能会提示内存不足！
将精简后的U8g2源码添加至Keil
在该工程的文件夹下新建文件夹U8g2，并将精简后csrc文件夹下的所有文件复制到此文件夹。同时新建文件夹Hardware，以便存放后面编写的移植函数和测试函数。
在管理工程项目界面，添加组U8g2，并将U8g2文件夹下的所有c文件添加进U8g2组中。同时添加组Hardware，以便将后面编写的移植函数和测试函数添加进此组中。
在选项→C/C++界面添加Hardware, U8g2两文件夹作为头文件路径。
编写程序
移植函数
stm32_u8g2.h:
#ifndef __STM32_U8G2_H
#define __STM32_U8G2_H
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "u8g2.h"
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* USER CODE BEGIN Private defines */
/* USER CODE END Private defines */
#define u8 unsigned char // ?unsigned char ????
#define MAX_LEN 128 //
#define OLED_ADDRESS 0x78 // oled
#define OLED_CMD 0x00 //
#define OLED_DATA 0x40 //
/* USER CODE BEGIN Prototypes */
uint8_t u8x8_byte_hw_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr);
void u8g2Init(u8g2_t *u8g2);
void draw(u8g2_t *u8g2);
void testDrawPixelToFillScreen(u8g2_t *u8g2);
#endif
stm32_u8g2.c:
#include "stm32_u8g2.h"
#include "tim.h"
#include "i2c.h"
uint8_t u8x8_byte_hw_i2c(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
/* u8g2/u8x8 will never send more than 32 bytes between START_TRANSFER and END_TRANSFER */
static uint8_t buffer[128];
static uint8_t buf_idx;
uint8_t *data;
switch (msg)
{
case U8X8_MSG_BYTE_INIT:
{
/* add your custom code to init i2c subsystem */
MX_I2C2_Init(); //I2C初始化
}
break;
case U8X8_MSG_BYTE_START_TRANSFER:
{
buf_idx = 0;
}
break;
case U8X8_MSG_BYTE_SEND:
{
data = (uint8_t *)arg_ptr;
while (arg_int > 0)
{
buffer[buf_idx++] = *data;
data++;
arg_int--;
}
}
break;
case U8X8_MSG_BYTE_END_TRANSFER:
{
if (HAL_I2C_Master_Transmit(&hi2c2, OLED_ADDRESS, buffer, buf_idx, 1000) != HAL_OK)
return 0;
}
break;
case U8X8_MSG_BYTE_SET_DC:
break;
default:
return 0;
}
return 1;
}
uint8_t u8x8_gpio_and_delay(u8x8_t *u8x8, uint8_t msg, uint8_t arg_int, void *arg_ptr)
{
switch (msg)
{
case U8X8_MSG_DELAY_100NANO: // delay arg_int * 100 nano seconds
__NOP();
break;
case U8X8_MSG_DELAY_10MICRO: // delay arg_int * 10 micro seconds
for (uint16_t n = 0; n < 320; n++)
{
__NOP();
}
break;
case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli second
HAL_Delay(1);
break;
case U8X8_MSG_DELAY_I2C: // arg_int is the I2C speed in 100KHz, e.g. 4 = 400 KHz
HAL_Delay(5);
break; // arg_int=1: delay by 5us, arg_int = 4: delay by 1.25us
case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pin
break; // arg_int=1: Input dir with pullup high for I2C clock pin
case U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pin
break; // arg_int=1: Input dir with pullup high for I2C data pin
case U8X8_MSG_GPIO_MENU_SELECT:
u8x8_SetGPIOResult(u8x8, /* get menu select pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_NEXT:
u8x8_SetGPIOResult(u8x8, /* get menu next pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_PREV:
u8x8_SetGPIOResult(u8x8, /* get menu prev pin state */ 0);
break;
case U8X8_MSG_GPIO_MENU_HOME:
u8x8_SetGPIOResult(u8x8, /* get menu home pin state */ 0);
break;
default:
u8x8_SetGPIOResult(u8x8, 1); // default return value
break;
}
return 1;
}
//U8g2的初始化，需要调用下面这个u8g2_Setup_ssd1306_128x64_noname_f函数，该函数的4个参数含义：
//u8g2：传入的U8g2结构体
//U8G2_R0：默认使用U8G2_R0即可（用于配置屏幕是否要旋转）
//u8x8_byte_sw_i2c：使用软件IIC驱动，该函数由U8g2源码提供
//u8x8_gpio_and_delay：就是上面我们写的配置函数
void u8g2Init(u8g2_t *u8g2)
{
u8g2_Setup_ssd1306_i2c_128x64_noname_f(u8g2, U8G2_R0, u8x8_byte_hw_i2c, u8x8_gpio_and_delay); // 初始化u8g2 结构体
u8g2_InitDisplay(u8g2); //
u8g2_SetPowerSave(u8g2, 0); //
u8g2_ClearBuffer(u8g2);
}
void draw(u8g2_t *u8g2)
{
u8g2_ClearBuffer(u8g2);
u8g2_SetFontMode(u8g2, 1); /*字体模式选择*/
u8g2_SetFontDirection(u8g2, 0); /*字体方向选择*/
u8g2_SetFont(u8g2, u8g2_font_inb24_mf); /*字库选择*/
u8g2_DrawStr(u8g2, 0, 20, "U");
u8g2_SetFontDirection(u8g2, 1);
u8g2_SetFont(u8g2, u8g2_font_inb30_mn);
u8g2_DrawStr(u8g2, 21,8,"8");
u8g2_SetFontDirection(u8g2, 0);
u8g2_SetFont(u8g2, u8g2_font_inb24_mf);
u8g2_DrawStr(u8g2, 51,30,"g");
u8g2_DrawStr(u8g2, 67,30,"\xb2");
u8g2_DrawHLine(u8g2, 2, 35, 47);
u8g2_DrawHLine(u8g2, 3, 36, 47);
u8g2_DrawVLine(u8g2, 45, 32, 12);
u8g2_DrawVLine(u8g2, 46, 33, 12);
u8g2_SetFont(u8g2, u8g2_font_4x6_tr);
u8g2_DrawStr(u8g2, 1,54,"github.com/olikraus/u8g2");
u8g2_SendBuffer(u8g2);
HAL_Delay(1000);
}
//画点填充
void testDrawPixelToFillScreen(u8g2_t *u8g2)
{
int t = 1000;
u8g2_ClearBuffer(u8g2);
for (int j = 0; j < 64; j++)
{
for (int i = 0; i < 128; i++)
{
u8g2_DrawPixel(u8g2,i, j);
}
}
HAL_Delay(1000);
}
测试函数
本实验的测试函数中包含了进度条显示、字体显示、图形显示等。
test.h:
#ifndef __TEST_H
#define __TEST_H
#include "main.h"
#include "u8g2.h"
void testDrawProcess(u8g2_t *u8g2);
void testShowFont(u8g2_t *u8g2);
void testDrawFrame(u8g2_t *u8g2);
void testDrawRBox(u8g2_t *u8g2);
void testDrawCircle(u8g2_t *u8g2);
void testDrawFilledEllipse(u8g2_t *u8g2);
void testDrawMulti(u8g2_t *u8g2);
void testDrawStrings(u8g2_t *u8g2);
void u8g2DrawTest(u8g2_t *u8g2);
#endif
test.c:
#include "test.h"
//---------------U8g2测试函数
#define SEND_BUFFER_DISPLAY_MS(u8g2, ms)\
do {\
u8g2_SendBuffer(u8g2); \
HAL_Delay(ms);\
}while(0);
//进度条显示
void testDrawProcess(u8g2_t *u8g2)
{
for(int i=10;i<=80;i=i+2)
{
u8g2_ClearBuffer(u8g2);
char buff[20];
sprintf(buff,"%d%%",(int)(i/80.0*100));
u8g2_SetFont(u8g2,u8g2_font_ncenB12_tf);
u8g2_DrawStr(u8g2,16,32,"STM32 U8g2");//字符显示
u8g2_SetFont(u8g2,u8g2_font_ncenB08_tf);
u8g2_DrawStr(u8g2,100,49,buff);//当前进度显示
u8g2_DrawRBox(u8g2,16,40,i,10,4);//圆角填充框矩形框
u8g2_DrawRFrame(u8g2,16,40,80,10,4);//圆角矩形
u8g2_SendBuffer(u8g2);
}
HAL_Delay(500);
}
//字体测试 数字英文可选用 u8g2_font_ncenB..(粗) 系列字体
//u8g2_font_unifont_t_symbols/u8g2_font_unifont_h_symbols(细 圆润)
void testShowFont(u8g2_t *u8g2)
{
int t = 1000;
char testStr[14] = "STM32F103C8T6";
u8g2_ClearBuffer(u8g2);
u8g2_SetFont(u8g2,u8g2_font_u8glib_4_tf);
u8g2_DrawStr(u8g2,0,5,testStr);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_SetFont(u8g2,u8g2_font_ncenB08_tf);
u8g2_DrawStr(u8g2,0,30,testStr);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_SetFont(u8g2,u8g2_font_ncenB10_tr);
u8g2_DrawStr(u8g2,0,60,testStr);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
//画空心矩形
void testDrawFrame(u8g2_t *u8g2)
{
int t = 1000;
int x = 16;
int y = 32;
int w = 50;
int h = 20;
u8g2_ClearBuffer(u8g2);
u8g2_DrawStr(u8g2,0, 15, "DrawFrame");
u8g2_DrawFrame(u8g2, x, y, w, h);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFrame(u8g2, x+w+5, y-10, w-20, h+20);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
//画实心圆角矩形
void testDrawRBox(u8g2_t *u8g2)
{
int t = 1000;
int x = 16;
int y = 32;
int w = 50;
int h = 20;
int r = 3;
u8g2_ClearBuffer(u8g2);
u8g2_DrawStr(u8g2,0, 15, "DrawRBox");
u8g2_DrawRBox(u8g2, x, y, w, h, r);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawRBox(u8g2, x+w+5, y-10, w-20, h+20, r);
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
//画空心圆
void testDrawCircle(u8g2_t *u8g2)
{
int t = 600;
int stx = 0; //画图起始x
int sty = 16; //画图起始y
int with = 16;//一个图块的间隔
int r = 15; //圆的半径
u8g2_ClearBuffer(u8g2);
u8g2_DrawStr(u8g2, 0, 15, "DrawCircle");
u8g2_DrawCircle(u8g2, stx, sty - 1 + with, r, U8G2_DRAW_UPPER_RIGHT); //右上
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawCircle(u8g2, stx + with, sty, r, U8G2_DRAW_LOWER_RIGHT); //右下
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawCircle(u8g2, stx - 1 + with * 3, sty - 1 + with, r, U8G2_DRAW_UPPER_LEFT); //左上
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawCircle(u8g2, stx - 1 + with * 4, sty, r, U8G2_DRAW_LOWER_LEFT); //左下
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawCircle(u8g2, stx - 1 + with * 2, sty - 1 + with * 2, r, U8G2_DRAW_ALL);//整个圆
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawCircle(u8g2, 32*3, 32, 31, U8G2_DRAW_ALL);//右侧整个圆
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
//画实心椭圆
void testDrawFilledEllipse(u8g2_t *u8g2)
{
int t = 800;
int with = 16;//一个图块的间隔
int rx = 27; //椭圆x方向的半径
int ry = 22; //椭圆y方向的半径
u8g2_ClearBuffer(u8g2);
u8g2_DrawStr(u8g2,0, 14, "DrawFilledEllipse");
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFilledEllipse(u8g2, 0, with, rx, ry, U8G2_DRAW_LOWER_RIGHT);//右下
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFilledEllipse(u8g2, with * 4 - 1, with, rx, ry, U8G2_DRAW_LOWER_LEFT); //左下
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFilledEllipse(u8g2, 0, with * 4 - 1, rx, ry, U8G2_DRAW_UPPER_RIGHT); //右上
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFilledEllipse(u8g2, with * 4 - 1, with * 4 - 1, rx, ry, U8G2_DRAW_UPPER_LEFT); //左上
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_DrawFilledEllipse(u8g2, with * 6, with * 2.5, rx, ry, U8G2_DRAW_ALL);//整个椭圆
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
//环形测试
void testDrawMulti(u8g2_t *u8g2)
{
u8g2_ClearBuffer(u8g2);
for (int j = 0; j < 64; j+=16)
{
for (int i = 0; i < 128; i+=16)
{
u8g2_DrawPixel(u8g2, i, j);
u8g2_SendBuffer(u8g2);
}
}
//实心矩形逐渐变大
u8g2_ClearBuffer(u8g2);
for(int i=30; i>0; i-=2)
{
u8g2_DrawBox(u8g2,i*2,i,128-i*4,64-2*i);
u8g2_SendBuffer(u8g2);
}
//空心矩形逐渐变小
u8g2_ClearBuffer(u8g2);
for(int i=0; i<32; i+=2)
{
u8g2_DrawFrame(u8g2,i*2,i,128-i*4,64-2*i);
u8g2_SendBuffer(u8g2);
}
//实心圆角矩形逐渐变大
u8g2_ClearBuffer(u8g2);
for(int i=30; i>0; i-=2)
{
u8g2_DrawRBox(u8g2,i*2,i,128-i*4,64-2*i,10-i/3);
u8g2_SendBuffer(u8g2);
}
//空心圆角矩形逐渐变小
u8g2_ClearBuffer(u8g2);
for(int i=0; i<32; i+=2)
{
u8g2_DrawRFrame(u8g2,i*2,i,128-i*4,64-2*i,10-i/3);
u8g2_SendBuffer(u8g2);
}
//实心圆逐渐变大
u8g2_ClearBuffer(u8g2);
for(int i=2; i<64; i+=3)
{
u8g2_DrawDisc(u8g2,64,32,i, U8G2_DRAW_ALL);
u8g2_SendBuffer(u8g2);
}
//空心圆逐渐变小
u8g2_ClearBuffer(u8g2);
for(int i=64; i>0; i-=3)
{
u8g2_DrawCircle(u8g2,64,32,i, U8G2_DRAW_ALL);
u8g2_SendBuffer(u8g2);
}
//实心椭圆逐渐变大
u8g2_ClearBuffer(u8g2);
for(int i=2; i<32; i+=3)
{
u8g2_DrawFilledEllipse(u8g2,64,32, i*2, i, U8G2_DRAW_ALL);
u8g2_SendBuffer(u8g2);
}
//空心椭圆逐渐变小
u8g2_ClearBuffer(u8g2);
for(int i=32; i>0; i-=3)
{
u8g2_DrawEllipse(u8g2,64,32, i*2, i, U8G2_DRAW_ALL);
u8g2_SendBuffer(u8g2);
}
}
void testDrawStrings(u8g2_t *u8g2)
{
int t=1000;
u8g2_ClearBuffer(u8g2);
u8g2_SetFont(u8g2,u8g2_font_ncenB08_tr);
u8g2_DrawStr(u8g2,0,10,"632207060215");
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_SetFont(u8g2,u8g2_font_ncenB18_tr);
u8g2_DrawStr(u8g2,0,40,"penCKG");
SEND_BUFFER_DISPLAY_MS(u8g2,t);
u8g2_SetFont(u8g2,u8g2_font_ncenB10_tr);
u8g2_DrawStr(u8g2,0,60,"Test Program");
SEND_BUFFER_DISPLAY_MS(u8g2,t);
}
void u8g2DrawTest(u8g2_t *u8g2)
{
testDrawProcess(u8g2);
testDrawMulti(u8g2);
//testDrawFrame(u8g2);
//testDrawRBox(u8g2);
//testDrawCircle(u8g2);
//testDrawFilledEllipse(u8g2);
testShowFont(u8g2);
testDrawStrings(u8g2);
}
主函数
main.c:
/* USER CODE BEGIN Header */
/**
******************************************************************************
* @file : main.c
* @brief : Main program body
******************************************************************************
* @attention
*
* Copyright (c) 2024 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "i2c.h"
#include "tim.h"
#include "gpio.h"
#include "u8g2.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
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();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_I2C2_Init();
MX_TIM1_Init();
/* USER CODE BEGIN 2 */
u8g2_t u8g2;
u8g2Init(&u8g2);
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
u8g2_FirstPage(&u8g2);
do
{
draw(&u8g2);
u8g2DrawTest(&u8g2);
} while (u8g2_NextPage(&u8g2));
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
{
Error_Handler();
}
}
/* USER CODE BEGIN 4 */
/* USER CODE END 4 */
/**
* @brief This function is executed in case of error occurrence.
* @retval None
*/
void Error_Handler(void)
{
/* USER CODE BEGIN Error_Handler_Debug */
/* User can add his own implementation to report the HAL error return state */
__disable_irq();
while (1)
{
}
/* USER CODE END Error_Handler_Debug */
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t *file, uint32_t line)
{
/* USER CODE BEGIN 6 */
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */
STM32开发板实现（实验结果）
将STM32开发板插入面包板并用ST-link与电脑相接。将OLED屏的VCC接至3.3V端口，GND接至GND端口，SCL接至PB10端口，SDA接至PB11端口。
编译通过后将程序下载至开发板中，结果如下。
【U8g2】【STM32开发板】OLED运行结果
