目录
1. 所需器件工具
2. IO端口配置
3. 移植步骤
3.1 精简c源码
3.1.1 去掉无用的驱动文件
3.1.2 精简u8g2_d_setup.c
3.1.3 精简u8g2_d_memory.c
3.2 创建函数
3.2.1 创建回调函数
3.2.2 创建测试函数
4. 添加u8g2源码到工程
4.1 项目文件配置
4.2 主函数main.c配置
5. 项目文件下载
简介
U8g2 是一个用于嵌入式设备的简易图形库,可以在多种 OLED 和 LCD 屏幕上,支持包括 SSD1306 等多种类型的底层驱动,并可以很方便地移植到 Arduino 、树莓派、NodeMCU 和 ARM 上。U8g2 库的 GitHub 地址为:https://github.com/olikraus/u8g2 ,可以从中获取到源码与文档帮助。
U8g2 库同时包含了 U8x8 绘图库,两者的区别为:
- U8g2 包含各种简单及复杂图形的绘制,并支持各种形式的字体,但需要占用一定单片机的内存作为绘图缓存
- U8x8 只包含简单的显示文本功能,且只支持简单、定宽的字体。它直接绘制图形,没有缓存功能
本篇,介绍一下U8g2库如何移植到STM32上,进行OLED的图形显示,本实验使用的OLED-0.96寸(SSD1306)作为驱动显示屏。
1. 所需器件工具
1.单片机:stm32f103rct6最小系统板;
2.显示器:OLED-0.96寸(SSD1306);
3.图形库下载: ① 官网:https://github.com/olikraus/u8g2 ②
2. IO端口配置
首先对创建stm32项目,并配置相应的IO口。
3. 移植步骤
对于下载U8g2的源码,因为STM32主要是使用C语言编程,所以只需关注源码中的C源码部分,即csrc文件夹下的文件。
3.1 精简c源码
U8g2支持多种显示驱动的屏幕,因为源码中也包含了各个驱动对应的文件,为了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。
3.1.1 去掉无用的驱动文件
这些驱动文件通常是u8x8_d_xxx.c,xxx包括驱动的型号和屏幕分辨率。ssd1306驱动芯片的OLED,使用u8x8_ssd1306_128x64_noname.c这个文件,其它的屏幕驱动和分辨率的文件可以删掉或者不添加到项目中。
3.1.2 精简u8g2_d_setup.c
由于我使用的OLED是IIC接口,只留一个 u8g2_Setup_ssd1306_i2c_128x64_noname_f 函数即可(由于为了后面便于其它型号的OLED移值,所以保留了一部分)。
注意,与这个函数看起来十分相似的函数的有:
- u8g2_Setup_ssd1306_128x64_noname_1
- u8g2_Setup_ssd1306_128x64_noname_2
- u8g2_Setup_ssd1306_128x64_noname_f
- u8g2_Setup_ssd1306_i2c_128x64_noname_1
- u8g2_Setup_ssd1306_i2c_128x64_noname_2
- u8g2_Setup_ssd1306_i2c_128x64_noname_f
其中,前面3个,是给SPI接口的OLED用的,函数最后的数字或字母,代表显示时的buf大小:
- 1:128字节
- 2:256字节
- f:1024字节
/* u8g2_d_setup.c */
/* generated code, codebuild, u8g2 project */#include "u8g2.h"/* ssd1306 */
/* ssd1306 1 */
void u8g2_Setup_ssd1306_128x64_noname_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_vcomh0_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_alt0_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
/* ssd1306 2 */
void u8g2_Setup_ssd1306_128x64_noname_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_vcomh0_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_alt0_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
/* ssd1306 f */
void u8g2_Setup_ssd1306_128x64_noname_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_vcomh0_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_128x64_alt0_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_001, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
/* ssd1306 */
/* ssd1306 1 */
void u8g2_Setup_ssd1306_i2c_128x64_noname_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_vcomh0_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_alt0_1(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_1(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
/* ssd1306 2 */
void u8g2_Setup_ssd1306_i2c_128x64_noname_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_vcomh0_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_alt0_2(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_2(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
/* ssd1306 f */
void u8g2_Setup_ssd1306_i2c_128x64_noname_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_noname, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_vcomh0_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_vcomh0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
void u8g2_Setup_ssd1306_i2c_128x64_alt0_f(u8g2_t *u8g2, const u8g2_cb_t *rotation, u8x8_msg_cb byte_cb, u8x8_msg_cb gpio_and_delay_cb)
{uint8_t tile_buf_height;uint8_t *buf;u8g2_SetupDisplay(u8g2, u8x8_d_ssd1306_128x64_alt0, u8x8_cad_ssd13xx_fast_i2c, byte_cb, gpio_and_delay_cb);buf = u8g2_m_16_8_f(&tile_buf_height);u8g2_SetupBuffer(u8g2, buf, tile_buf_height, u8g2_ll_hvline_vertical_top_lsb, rotation);
}
3.1.3 精简u8g2_d_memory.c
由于 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,其它的函数要删掉,否则编译时很可能会提示内存不足(由于为了后面便于其它型号的OLED移值,所以保留了一部分)。
/* u8g2_d_memory.c */
/* generated code, codebuild, u8g2 project */#include "u8g2.h"uint8_t *u8g2_m_16_4_1(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 1;return 0;#elsestatic uint8_t buf[128];*page_cnt = 1;return buf;#endif
}
uint8_t *u8g2_m_16_4_2(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 2;return 0;#elsestatic uint8_t buf[256];*page_cnt = 2;return buf;#endif
}
uint8_t *u8g2_m_16_4_f(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 4;return 0;#elsestatic uint8_t buf[512];*page_cnt = 4;return buf;#endif
}
uint8_t *u8g2_m_16_8_1(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 1;return 0;#elsestatic uint8_t buf[128];*page_cnt = 1;return buf;#endif
}
uint8_t *u8g2_m_16_8_2(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 2;return 0;#elsestatic uint8_t buf[256];*page_cnt = 2;return buf;#endif
}
uint8_t *u8g2_m_16_8_f(uint8_t *page_cnt)
{#ifdef U8G2_USE_DYNAMIC_ALLOC*page_cnt = 8;return 0;#elsestatic uint8_t buf[1024];*page_cnt = 8;return buf;#endif
}
3.2 创建函数
3.2.1 创建回调函数
这个函数需要自己写,主要的修改包括:
- (1) 赋予U8g2相应的延时函数;
- (2) 为U8g2提供SCL与SDA接口的高低电平调用;
- ① U8X8_MSG_GPIO_I2C_DATA: IIC的SDA
- ② U8X8_MSG_GPIO_I2C_CLOCK: IIC的SCL
uint8_t u8x8_stm32_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 secondsfor (uint16_t n = 0; n < 320; n++){__NOP();}break;case U8X8_MSG_DELAY_MILLI: // delay arg_int * 1 milli secondHAL_Delay(arg_int);break;case U8X8_MSG_GPIO_I2C_CLOCK: // arg_int=0: Output low at I2C clock pinif(arg_int) HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_SET);else HAL_GPIO_WritePin(GPIOB,GPIO_PIN_6,GPIO_PIN_RESET);break; // arg_int=1: Input dir with pullup high for I2C clock pincase U8X8_MSG_GPIO_I2C_DATA: // arg_int=0: Output low at I2C data pinif(arg_int) HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_SET);else HAL_GPIO_WritePin(GPIOB,GPIO_PIN_7,GPIO_PIN_RESET);break; // arg_int=1: Input dir with pullup high for I2C data pin}return 1;
}
3.2.2 创建测试函数
使用U8g2提供的测试函数,用于查看显示效果。
void draw(u8g2_t *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");
}
4. 添加u8g2源码到工程
4.1 项目文件配置
4.2 主函数main.c配置
#include "u8g2.h"int main{u8g2_t u8g2;u8g2_Setup_ssd1306_i2c_128x64_noname_f(&u8g2, U8G2_R0, u8x8_byte_sw_i2c,u8x8_stm32_gpio_and_delay); // 初始化 u8g2 结构体u8g2_InitDisplay(&u8g2); // 根据所选的芯片进行初始化工作,初始化完成后,显示器处于关闭状态u8g2_SetPowerSave(&u8g2, 0); // 打开显示器u8g2_ClearBuffer(&u8g2);
while(1){u8g2_FirstPage(&u8g2);do{draw(&u8g2);} while (u8g2_NextPage(&u8g2));}}
5. 项目文件下载
https://download.csdn.net/download/qq_26043945/88252693