NUC980-OLED实现全中文字库的方法

1.背景

有一个产品，客户需要屏幕展示一些内容，要带一些中文，实现了OLED12864的驱动，但是它不带字库，现在要实现OLED全字库的显示

2.制作原始字库

下载软件pctolcd2002

设置

制作字库

打开原始文件

用软件自带的，或者自己去找字

生成字库文件

生成的内容如下

特别注意，保存的文件编码要是UTF-8的，不然后面会有点麻烦

3.转换

自行调整内容，字符"啊"之前的可以不要

目标格式应该是这样的

4.实现OLED驱动接口

oled.c

#include "oled.h"/* ssd1306所对应的I2C控制器的设备节点 */ 
#define SSD1306_DEVICE      "/dev/i2c-0"    /* ssd1306的I2C设备地址 */
#define SSD1306_ADDR    0x3Cuint8_t OLED_Display[128][8];
uint8_t OLED_Display_Cache[128][8];static int oled_fd;/**********************************************
// IIC Write Command
**********************************************/
void Write_IIC_Command(unsigned char command)
{unsigned char buf[2];buf[0] = 0x00;  // 控制字节，0x00表示接下来的字节是命令buf[1] = command;write(oled_fd, buf, 2);
}
/**********************************************
// IIC Write Data
**********************************************/
void Write_IIC_Data(unsigned char data)
{unsigned char buf[2];buf[0] = 0x40;  // 控制字节，0x40表示接下来的字节是数据buf[1] = data;write(oled_fd, buf, 2);
}void OLED_WR_Byte(unsigned dat,unsigned cmd)
{if(cmd){Write_IIC_Data(dat);}else {Write_IIC_Command(dat);}
}/*        设置OLED屏的显示坐标*  　　  X : 表示OLED的水平坐标（0—127）* 　　   Y : 表示OLED的页（0—7）
*/
void OLED_Set_Pos(unsigned char x, unsigned char y) 
{   OLED_WR_Byte(0xb0+(y & 0x0f),OLED_CMD);OLED_WR_Byte(((x&0xf0)>>4)|0x10,OLED_CMD);OLED_WR_Byte((x&0x0f),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)  
{  uint8_t 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
}/*
函数功能：OLED打点函数
输入参数：点所在坐标 x=0~127 y = 0~63
输出参数：无
用到的全局变量：无
*/
void OLED_Dot(uint8_t x,uint8_t y,uint8_t state)
{if(state)OLED_Display_Cache[x][y>>3] |= 1 << (y%8); elseOLED_Display_Cache[x][y>>3]&= ~(1 << (y%8)); 
}/*
函数功能：OLED刷屏任务
输入参数：OLED显示缓存数组
输出参数：无
用到的全局变量：无
*/
void OLED_Process()
{unsigned char x,y;for(y=0;y<8;y++){                       for(x=0;x<128;x++){   if(OLED_Display[x][y] != OLED_Display_Cache[x][y])  {OLED_Display[x] [y]= OLED_Display_Cache[x][y];      OLED_Set_Pos(x,y);OLED_WR_Byte(OLED_Display[x] [y],OLED_DATA);}}}
}void OLED_Print(uint8_t x, uint8_t y, char *s)
{uint16_t targetIndex = sizeof(CN16_Msk)/35; // 目标汉字的内码printf("targetIndex:%d\r\n",targetIndex);fflush(stdout);uint16_t length = strlen(s);//取字符串总长printf("length:%d\r\n",length);fflush(stdout);uint16_t offset = x;for(uint16_t i=0;i<length;i++){uint8_t first = *(s+i);if(first <= 127){//小于128是ASCII符号for(uint8_t n=0;n<8;n++){OLED_Display_Cache[x+offset][y] = F8X16[first][n]; OLED_Display_Cache[x+offset][y+1] = F8X16[first][8+n+3]; offset++;}}else if(first > 127){//大于127，为汉字uint8_t utf[4];utf[0] = first;i++;utf[1] = *(s+i);i++;utf[2] = *(s+i);for(uint16_t j=0;j<targetIndex;j++){if(utf[0] == CN16_Msk[j][0] && utf[1] == CN16_Msk[j][1] && utf[2] == CN16_Msk[j][2]){for(uint8_t n=0;n<16;n++){OLED_Display_Cache[x+offset][y] = CN16_Msk[j][n]; OLED_Display_Cache[x+offset][y+1] = CN16_Msk[j][16+n+3]; offset++;}}}}}
}//初始化SSD1306                        
void OLED_Init(void)
{   /* 打开ssd1306对应的I2C控制器文件 */oled_fd =open(SSD1306_DEVICE, O_RDWR);if (oled_fd< 0) {printf("open 0x%s failed \n",SSD1306_DEVICE);}/*设置ssd1306的I2C设备地址*/if (ioctl(oled_fd,I2C_SLAVE_FORCE, SSD1306_ADDR) < 0) {            printf("set slave address failed \n");}usleep(50000);OLED_WR_Byte(0xAE,OLED_CMD);//--display offOLED_WR_Byte(0x00,OLED_CMD);//---set low column addressOLED_WR_Byte(0x10,OLED_CMD);//---set high column addressOLED_WR_Byte(0x40,OLED_CMD);//--set start line address  OLED_WR_Byte(0xB0,OLED_CMD);//--set page addressOLED_WR_Byte(0x81,OLED_CMD); // contract controlOLED_WR_Byte(0xFF,OLED_CMD);//--128   OLED_WR_Byte(0xA1,OLED_CMD);//set segment remap OLED_WR_Byte(0xA6,OLED_CMD);//--normal / reverseOLED_WR_Byte(0xA8,OLED_CMD);//--set multiplex ratio(1 to 64)OLED_WR_Byte(0x3F,OLED_CMD);//--1/32 dutyOLED_WR_Byte(0xC8,OLED_CMD);//Com scan directionOLED_WR_Byte(0xD3,OLED_CMD);//-set display offsetOLED_WR_Byte(0x00,OLED_CMD);//OLED_WR_Byte(0xD5,OLED_CMD);//set osc divisionOLED_WR_Byte(0x80,OLED_CMD);//OLED_WR_Byte(0xD8,OLED_CMD);//set area color mode offOLED_WR_Byte(0x05,OLED_CMD);//OLED_WR_Byte(0xD9,OLED_CMD);//Set Pre-Charge PeriodOLED_WR_Byte(0xF1,OLED_CMD);//OLED_WR_Byte(0xDA,OLED_CMD);//set com pin configuartionOLED_WR_Byte(0x12,OLED_CMD);//OLED_WR_Byte(0xDB,OLED_CMD);//set VcomhOLED_WR_Byte(0x30,OLED_CMD);//OLED_WR_Byte(0x8D,OLED_CMD);//set charge pump enableOLED_WR_Byte(0x14,OLED_CMD);//OLED_WR_Byte(0xAF,OLED_CMD);//--turn on oled panelOLED_Clear();
}  int main()
{OLED_Init();OLED_Print(8,2,"123和你啊");OLED_Process();while(1){#if 0 //测试按点刷屏for(uint8_t i=0;i<128;i++){for(uint8_t j=0;j<64;j++){OLED_Dot( i,j,1);OLED_Process();}}#endif}return 0;
}

oled.h

#ifndef __OLED_H
#define __OLED_H                 
//#include "sys.h"
#include "stdlib.h"
#include <stdint.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <fcntl.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <string.h>#include "oledfont.h"  #define OLED_MODE 0
#define SIZE 8
#define XLevelL     0x00
#define XLevelH     0x10
#define Max_Column  128
#define Max_Row     64
#define Brightness  0xFF 
#define X_WIDTH     128
#define Y_WIDTH     64                                
//-----------------OLED IIC端口定义----------------                                  
#define OLED_CMD  0 //写命令
#define OLED_DATA 1 //写数据//OLED控制用函数
void OLED_Display_On(void);
void OLED_Display_Off(void);                                            
void OLED_Init(void);
void OLED_Clear(void);#endif  

5.字库调整

利用python把ascii编码改为utf8编码

with open('input.txt', 'r', encoding='utf-8') as input_file:with open('output.txt', 'w', encoding='utf-8') as output_file:for line in input_file:char = line.strip()utf8_byte = char.encode("utf-8")hex_str = ", ".join([f"0x{x:02x}" for x in utf8_byte])output_file.write(hex_str + "\n")

输入文件是

输出信息是

截取字库片段

#ifndef __OLEDFONT_H
#define __OLEDFONT_H        /****************************************8*16的点阵************************************/
const unsigned char F8X16[][16]=      
{
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/
{0xF0,0x08,0xF0,0x80,0x60,0x18,0x00,0x00,0x00,0x31,0x0C,0x03,0x1E,0x21,0x1E,0x00},/*"%",37*/
{0x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x2C,0x19,0x27,0x21,0x10},/*"&",38*/
{0x00,0x12,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",39*/
{0x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00},/*"(",40*/
{0x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00},/*")",41*/
{0x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00},/*"*",42*/
{0x00,0x00,0x00,0x00,0xE0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x0F,0x01,0x01,0x01},/*"+",43*/
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x90,0x70,0x00,0x00,0x00,0x00,0x00},/*",",44*/
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x00},/*"-",45*/
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00},/*".",46*/
{0x00,0x00,0x00,0x00,0xC0,0x38,0x04,0x00,0x00,0x60,0x18,0x07,0x00,0x00,0x00,0x00},/*"/",47*/
{0x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00},/*"0",48*/
{0x00,0x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00},/*"1",49*/
{0x00,0x70,0x08,0x08,0x08,0x08,0xF0,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00},/*"2",50*/
{0x00,0x30,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x18,0x20,0x21,0x21,0x22,0x1C,0x00},/*"3",51*/
{0x00,0x00,0x80,0x40,0x30,0xF8,0x00,0x00,0x00,0x06,0x05,0x24,0x24,0x3F,0x24,0x24},/*"4",52*/
{0x00,0xF8,0x88,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x20,0x20,0x20,0x11,0x0E,0x00},/*"5",53*/
};// typedef struct {
//     // unsigned char Index[3];  // 汉字UTF-8内码
//     // unsigned char Msk[32];  // 字模
//     unsigned char Msk[35];
// } __attribute__((packed)) GB2312_GB16_t;const unsigned char CN16_Msk[][35]={
{0xe5, 0x95, 0x8a,0xFC,0x04,0xFC,0x00,0xFE,0x42,0xBE,0x00,0xF2,0x12,0xF2,0x02,0xFE,0x02,0x00,0x00,0x0F,0x04,0x0F,0x00,0xFF,0x10,0x0F,0x00,0x0F,0x04,0x4F,0x80,0x7F,0x00,0x00,0x00},/*'啊',1410*/
{0xe9, 0x98, 0xbf,0x00,0xFE,0x02,0x22,0xDA,0x06,0x00,0xF2,0x12,0x12,0xF2,0x02,0xFE,0x02,0x02,0x00,0x00,0xFF,0x08,0x10,0x08,0x07,0x00,0x0F,0x04,0x04,0x4F,0x80,0x7F,0x00,0x00,0x00},/*'阿',1411*/
{0xe5, 0x9f, 0x83,0x20,0x20,0xFF,0x20,0x20,0x10,0x98,0xF4,0x92,0x91,0x90,0x94,0x98,0x30,0x00,0x00,0x10,0x30,0x1F,0x08,0x88,0x85,0x44,0x24,0x14,0x0F,0x14,0x24,0x44,0x84,0x84,0x00},/*'埃',1412*/
{0xe6, 0x8c, 0xa8,0x10,0x10,0xFF,0x10,0x00,0x10,0x98,0xF4,0x92,0x91,0x90,0x94,0x98,0x30,0x00,0x00,0x42,0x82,0x7F,0x01,0x84,0x85,0x44,0x24,0x14,0x0F,0x14,0x24,0x44,0x84,0x84,0x00},/*'挨',1413*/
{0xe5, 0x93, 0x8e,0x00,0xFC,0x04,0x04,0xFC,0x00,0xC4,0x1F,0x04,0x04,0x04,0x1F,0xC4,0x04,0x00,0x00,0x00,0x0F,0x04,0x04,0x8F,0x80,0x40,0x23,0x14,0x08,0x14,0x23,0x40,0x80,0x80,0x00},/*'哎',1414*/
{0xe5, 0x94, 0x89,0xFC,0x04,0x04,0xFC,0x00,0x10,0x98,0xF4,0x92,0x91,0x90,0x94,0x98,0x30,0x00,0x00,0x1F,0x08,0x08,0x1F,0x84,0x85,0x44,0x24,0x14,0x0F,0x14,0x24,0x44,0x84,0x84,0x00},/*'唉',1415*/
};
#endif

6.显示效果

7.优化

上面的代码，存在一个问题是，Y轴的步进必须是8个点，需要优化为任意位置的显示

void OLED_Dot_Line(uint8_t x, uint8_t y, uint8_t temp)
{for(uint8_t i=0;i<8;i++){       if(temp&0x01)   {OLED_Dot(x,y,1);}  else{OLED_Dot(x,y,0);}temp = temp>>1;y++;if(y>=64)return;    //超区域了}    
}void OLED_Print(uint8_t x, uint8_t y, char *s)
{uint16_t targetIndex = sizeof(CN16_Msk)/35; // 目标汉字的内码uint16_t length = strlen(s);//取字符串总长// printf("length:%d\r\n",length);// fflush(stdout);uint16_t offset = x;for(uint16_t i=0;i<length;i++){uint8_t first = *(s+i);if(first <= 127){//小于128是ASCII符号for(uint8_t n=0;n<8;n++){OLED_Dot_Line(x+offset,y,F8X16[first][n]);OLED_Dot_Line(x+offset,y+8,F8X16[first][n+8]);offset++;}}else if(first > 127){//大于127，为汉字uint8_t utf[4];utf[0] = first;i++;utf[1] = *(s+i);i++;utf[2] = *(s+i);for(uint16_t j=0;j<targetIndex;j++){if(utf[0] == CN16_Msk[j][0] && utf[1] == CN16_Msk[j][1] && utf[2] == CN16_Msk[j][2]){for(uint8_t n=0;n<16;n++){OLED_Dot_Line(x+offset,y,CN16_Msk[j][n+3]);OLED_Dot_Line(x+offset,y+8,CN16_Msk[j][n+16+3]);offset++;}}}}}
}