写在前面

  硬件软件准备:

名称备注
屏幕SSD1106本文章所使用的的屏幕型号,仅仅作为驱动移植示例,其他型号的都可以按照本文的方法推广
树莓派3B用于驱动屏幕,树莓派2B3B4B等型号都可以
ESP32开发板用于驱动屏幕,具体是ESP32还是ESP32-C3/S2/S3/C6等都可以,树莓派和ESP32选一就可以
VScode用来写代码,如果路子比较野用txt也可以
ESP-IDFESP32开发框架,使用的是发行版v5.0,获取方法见官网,如果不用ESP32就不需要
Ubuntu22.04windows也可以,但是这里以ubuntu系统为例

  因为在嵌入式系统中,由于硬件的多样性,移植驱动是常见的事情,本文适合作为驱动移植的小练习。个人认为,驱动移植主要考察读代码和修改代码,说白了就是把别人写好的东西搬运一下,然后将其修改以适应目标平台,使目标平台可以成功运行,就完成了移植的工作

  整体思路:就是我买来了一块屏幕SSD1106,然后一般买一个设备,厂家会提供datasheet,甚至使一些开发文件。如果仅仅有datasheet,要么就自己写驱动,要么就去网上找下载驱动。如果厂家提供了,那么就可以移植。这里厂家是给我提供了驱动资料的,但是我一打开发现只有arduinoSTM32的,因此着手准备驱动移植吧。任务目标就是分别使用树莓派和ESP32点亮这块屏幕。

  本文的相关代码见我的GitHub:https://github.com/SuperiorLQF/oled_drive

1 原驱动文件

  打开厂家提供的驱动例程,在HARDWARE文件夹下的OLED文件夹下,可以看到以下四个C文件

  然后发现核心驱动程序是oled.coled.h文件,bmp.h是用来显示特定图片的,而oledfont.h是用来显示

  文件内容分别如下,供参考


oled.h

#ifndef __OLED_H#define __OLED_H   #include "sys.h"#include "stdlib.h"    //OLED模式设置//0:4线串行模式//1:并行8080模式#define OLED_MODE 0#define SIZE 16#define XLevelL0x00#define XLevelH0x10#define Max_Column128#define Max_Row64#defineBrightness0xFF #define X_WIDTH 128#define Y_WIDTH 64      //-----------------OLED端口定义----------------     #define OLED_CS_Clr()  GPIO_ResetBits(GPIOD,GPIO_Pin_3)//CS#define OLED_CS_Set()  GPIO_SetBits(GPIOD,GPIO_Pin_3)#define OLED_RST_Clr() GPIO_ResetBits(GPIOD,GPIO_Pin_4)//RES#define OLED_RST_Set() GPIO_SetBits(GPIOD,GPIO_Pin_4)#define OLED_DC_Clr() GPIO_ResetBits(GPIOD,GPIO_Pin_5)//DC#define OLED_DC_Set() GPIO_SetBits(GPIOD,GPIO_Pin_5)#define OLED_WR_Clr() GPIO_ResetBits(GPIOG,GPIO_Pin_14)#define OLED_WR_Set() GPIO_SetBits(GPIOG,GPIO_Pin_14)#define OLED_RD_Clr() GPIO_ResetBits(GPIOG,GPIO_Pin_13)#define OLED_RD_Set() GPIO_SetBits(GPIOG,GPIO_Pin_13)//PC0~7,作为数据线#define DATAOUT(x) GPIO_Write(GPIOC,x);//输出  //使用4线串行接口时使用 #define OLED_SCLK_Clr() GPIO_ResetBits(GPIOD,GPIO_Pin_6)//CLK#define OLED_SCLK_Set() GPIO_SetBits(GPIOD,GPIO_Pin_6)#define OLED_SDIN_Clr() GPIO_ResetBits(GPIOD,GPIO_Pin_7)//DIN#define OLED_SDIN_Set() GPIO_SetBits(GPIOD,GPIO_Pin_7)      #define OLED_CMD  0//写命令#define OLED_DATA 1//写数据//OLED控制用函数void OLED_WR_Byte(u8 dat,u8 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);void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size);void OLED_ShowString(u8 x,u8 y, u8 *p); 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

#include "oled.h"#include "stdlib.h"#include "oledfont.h"   #include "delay.h"//OLED的显存//存放格式如下.//[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    #if OLED_MODE==1//向SSD1106写入一个字节。//dat:要写入的数据/命令//cmd:数据/命令标志 0,表示命令;1,表示数据;void OLED_WR_Byte(u8 dat,u8 cmd){DATAOUT(dat);    if(cmd)  OLED_DC_Set();else   OLED_DC_Clr();   OLED_CS_Clr();OLED_WR_Clr(); OLED_WR_Set();OLED_CS_Set();  OLED_DC_Set(); }         #else//向SSD1106写入一个字节。//dat:要写入的数据/命令//cmd:数据/命令标志 0,表示命令;1,表示数据;void OLED_WR_Byte(u8 dat,u8 cmd){u8 i;  if(cmd)  OLED_DC_Set();else   OLED_DC_Clr();  OLED_CS_Clr();for(i=0;i<8;i++){  OLED_SCLK_Clr();if(dat&0x80)   OLED_SDIN_Set();else    OLED_SDIN_Clr();OLED_SCLK_Set();dat<<=1;   }   OLED_CS_Set();OLED_DC_Set();     } #endifvoid 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)|0x01,OLED_CMD); }     //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 ONOLED_WR_Byte(0XAF,OLED_CMD);  //DISPLAY ON}//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 OFFOLED_WR_Byte(0XAE,OLED_CMD);  //DISPLAY OFF}    //清屏函数,清完屏,整个屏幕是黑色的!和没点亮一样!!!  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 (0x02,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}//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 //size:选择字体 16/12 void OLED_ShowChar(u8 x,u8 y,u8 chr){      unsigned char c=0,i=0;c=chr-' ';//得到偏移后的值if(x>Max_Column-1){x=0;y=y+2;}if(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+1);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,y :起点坐标 //len :数字的位数//size:字体大小//mode:模式0,填充模式;1,叠加模式//num:数值(0~4294967295);   void OLED_ShowNum(u8 x,u8 y,u32 num,u8 len,u8 size){         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+(size/2)*t,y,' ');continue;}else enshow=1;   } OLED_ShowChar(x+(size/2)*t,y,temp+'0'); }} //显示一个字符号串void OLED_ShowString(u8 x,u8 y,u8 *chr){unsigned char j=0;while (chr[j]!='\0'){OLED_ShowChar(x,y,chr[j]);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128×64起始点坐标(x,y),x的范围0~127,y为页的范围0~7*****************/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){     GPIO_InitTypeDef  GPIO_InitStructure;  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOD|RCC_APB2Periph_GPIOG, ENABLE); //使能PC,D,G端口时钟GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_3|GPIO_Pin_8; //PD3,PD6推挽输出   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;  //推挽输出GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;//速度50MHz GPIO_Init(GPIOD, &GPIO_InitStructure);  //初始化GPIOD3,6 GPIO_SetBits(GPIOD,GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_3|GPIO_Pin_8);//PD3,PD6 输出高 #if OLED_MODE==1  GPIO_InitStructure.GPIO_Pin =0xFF; //PC0~7 OUT推挽输出 GPIO_Init(GPIOC, &GPIO_InitStructure); GPIO_SetBits(GPIOC,0xFF); //PC0~7输出高 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15; //PG13,14,15 OUT推挽输出 GPIO_Init(GPIOG, &GPIO_InitStructure); GPIO_SetBits(GPIOG,GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15); //PG13,14,15 OUT  输出高 #else GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1; //PC0,1 OUT推挽输出 GPIO_Init(GPIOC, &GPIO_InitStructure); GPIO_SetBits(GPIOC,GPIO_Pin_0|GPIO_Pin_1); //PC0,1 OUT  输出高GPIO_InitStructure.GPIO_Pin = GPIO_Pin_15; //PG15 OUT推挽输出  RST GPIO_Init(GPIOG, &GPIO_InitStructure); GPIO_SetBits(GPIOG,GPIO_Pin_15); //PG15 OUT  输出高 #endif   OLED_RST_Set();delay_ms(100);OLED_RST_Clr();delay_ms(100);OLED_RST_Set();   OLED_WR_Byte(0xAE,OLED_CMD);//--turn off oled panelOLED_WR_Byte(0x02,OLED_CMD);//---set low column addressOLED_WR_Byte(0x10,OLED_CMD);//---set high column addressOLED_WR_Byte(0x40,OLED_CMD);//--set start line address  Set Mapping RAM Display Start Line (0x00~0x3F)OLED_WR_Byte(0x81,OLED_CMD);//--set contrast control registerOLED_WR_Byte(0xCF,OLED_CMD); // Set SEG Output Current BrightnessOLED_WR_Byte(0xA1,OLED_CMD);//--Set SEG/Column Mapping     0xa0左右反置 0xa1正常OLED_WR_Byte(0xC8,OLED_CMD);//Set COM/Row Scan Direction   0xc0上下反置 0xc8正常OLED_WR_Byte(0xA6,OLED_CMD);//--set normal displayOLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)OLED_WR_Byte(0x3f,OLED_CMD);//--1/64 dutyOLED_WR_Byte(0x81,OLED_CMD); //对比度设置OLED_WR_Byte(0xfF,OLED_CMD); //1~255;默认0X7F (亮度设置,越大越亮)OLED_WR_Byte(0xD3,OLED_CMD);//-set display offsetShift Mapping RAM Counter (0x00~0x3F)OLED_WR_Byte(0x00,OLED_CMD);//-not offsetOLED_WR_Byte(0xd5,OLED_CMD);//--set display clock divide ratio/oscillator frequencyOLED_WR_Byte(0x80,OLED_CMD);//--set divide ratio, Set Clock as 100 Frames/SecOLED_WR_Byte(0xD9,OLED_CMD);//--set pre-charge periodOLED_WR_Byte(0xF1,OLED_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 ClockOLED_WR_Byte(0xDA,OLED_CMD);//--set com pins hardware configurationOLED_WR_Byte(0x12,OLED_CMD);OLED_WR_Byte(0xDB,OLED_CMD);//--set vcomhOLED_WR_Byte(0x40,OLED_CMD);//Set VCOM Deselect LevelOLED_WR_Byte(0x20,OLED_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)OLED_WR_Byte(0x02,OLED_CMD);//OLED_WR_Byte(0x8D,OLED_CMD);//--set Charge Pump enable/disableOLED_WR_Byte(0x14,OLED_CMD);//--set(0x10) disableOLED_WR_Byte(0xA4,OLED_CMD);// Disable Entire Display On (0xa4/0xa5)OLED_WR_Byte(0xA6,OLED_CMD);// Disable Inverse Display On (0xa6/a7) OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panelOLED_WR_Byte(0xAF,OLED_CMD); /*display ON*/ OLED_Clear();OLED_Set_Pos(0,0); }  

oledfont.h

#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,// sp0x00, 0x00, 0x00, 0x2f, 0x00, 0x00,// !0x00, 0x00, 0x07, 0x00, 0x07, 0x00,// "0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14,// #0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12,// $0x00, 0x62, 0x64, 0x08, 0x13, 0x23,// %0x00, 0x36, 0x49, 0x55, 0x22, 0x50,// &0x00, 0x00, 0x05, 0x03, 0x00, 0x00,// '0x00, 0x00, 0x1c, 0x22, 0x41, 0x00,// (0x00, 0x00, 0x41, 0x22, 0x1c, 0x00,// )0x00, 0x14, 0x08, 0x3E, 0x08, 0x14,// *0x00, 0x08, 0x08, 0x3E, 0x08, 0x08,// +0x00, 0x00, 0x00, 0xA0, 0x60, 0x00,// ,0x00, 0x08, 0x08, 0x08, 0x08, 0x08,// -0x00, 0x00, 0x60, 0x60, 0x00, 0x00,// .0x00, 0x20, 0x10, 0x08, 0x04, 0x02,// /0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E,// 00x00, 0x00, 0x42, 0x7F, 0x40, 0x00,// 10x00, 0x42, 0x61, 0x51, 0x49, 0x46,// 20x00, 0x21, 0x41, 0x45, 0x4B, 0x31,// 30x00, 0x18, 0x14, 0x12, 0x7F, 0x10,// 40x00, 0x27, 0x45, 0x45, 0x45, 0x39,// 50x00, 0x3C, 0x4A, 0x49, 0x49, 0x30,// 60x00, 0x01, 0x71, 0x09, 0x05, 0x03,// 70x00, 0x36, 0x49, 0x49, 0x49, 0x36,// 80x00, 0x06, 0x49, 0x49, 0x29, 0x1E,// 90x00, 0x00, 0x36, 0x36, 0x00, 0x00,// :0x00, 0x00, 0x56, 0x36, 0x00, 0x00,// ;0x00, 0x08, 0x14, 0x22, 0x41, 0x00,// <0x00, 0x14, 0x14, 0x14, 0x14, 0x14,// =0x00, 0x00, 0x41, 0x22, 0x14, 0x08,// >0x00, 0x02, 0x01, 0x51, 0x09, 0x06,// " />  0x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,//# 3  0x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,//$ 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},/*"技",6*/};#endif

bmp.h

#ifndef __BMP_H#define __BMP_Hunsigned char BMP1[] 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char BMP2[] 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2 移植方法

  我们从这几个文件入手,读懂它们,是移植的关键。

条件编译

  首先,我们发现,厂家的.h文件,都是这样的结构:

#ifndef XXX#define XXX<程序段1>...#else<程序段2>...#endif

  这是条件编译,我们知道在嵌入式软开课程中学过,C语言编译包括预处理,编译和链接,我们曾经还学习过用gcc控制只编译不链接等练习。而这里的条件编译就是在预处理过程中,先根据#ifdef XXX判断XXX是否被宏定义过,如果没有,则用#define XXX定义XXX,并且编译接下来的程序段1。否则直接编译程序段2,忽视程序段1.
 条件编译的好处是,防止重复编译。例如C包含了头文件A和头文件B,而头文件B又包含了头文件A。这样子头文件A中的东西会被定义两次,在编译时会报重复定义的错误。而如果加入了条件编译,因为在第二次遇到时,#ifndef条件为假,就不会编译相应程序段造成重复定义错误了。

C文件和头文件的关系

  习惯上是,将实现相同功能的.c和.h用一样的命名,例如我需要移植的驱动,我就为源文件和头文件分别命名为oleddriver.coledfriver.h
 其中.c主要是函数实现,.h主要包含函数原型、函数声明、以及一些宏定义。当然,在该.c文件中还要通过#include加入.h,可以简单理解为,#include xxx,h,就是把这个.h的内容cpoy进这个.c文件中,预处理器用头文件内容来代替这句#include。因为.c函数实现不能单独被编译,需要有函数声明,否则会报implicit function define,就是函数没有声明,还有函数中用到的一些宏定义也找不到,因此需要用#include将头文件加入进来,用于链接之前的分别编译

C语言定义、声明和引用的关系

  C语言时从上到下编译顺序执行,按理来说应当先定义再引用而如果没有先定义就要引用,应该在之前先声明一下,就是告知编译器,我之后会定义的,你可以先用。例子就是C语言函数的定义,如果你定义在main前面,就不需要声明,如果你定义在main后面,就需要声明,#include xxx.h就是这个作用,因为将要引用的函数在其他的.c文件中,编译到引用的地方会发现还没定义,因此先通过添加头文件来实现声明。

  具体C语言自己写main文件之外的.c文件和.h文件时,可以参考这个步骤
 注意,这种方法时不生成库的,只是把多个c文件编译链接,如果要生成库应该使用CMaketarget_link_libraries等命令。

  因此,我们只需要删去头文件以及C文件中独立的部分,比如系统头文件,STM32专属的GPIO语句,都可以删去并且寻求目标系统的取代语句。例如树莓派中使用的是wiringPi库中的digitalWrite函数来操作GPIO,使用usleep实现微秒延时。而在ESP32中使用idf提供的driver/gpio库,使用idf自带的freertos函数vTaskdelay实现微秒延时。
 当然,我另外把打篮球的视频通过pic2lcd软件生产了C语言数组,然后用python把每一帧的数组拼成二维数组(这一块文件批处理确实挺麻烦的,但我认为不是本次的重点,这里就略过了)

3 移植效果

  过程中发现我的EPS32开发板5V端口不输出,麻了,找了半天bug

  树莓派实现:
 ESP32实现: