ssd1306 oled字模获取的一种方法
ssd1306 oled字模获取的一种方法
- 前言
- FontForge
- XBM格式
- 转换程序
前言
最近在玩0.91吋的oled显示屏，想显示汉字，最开始的想法是编写一个程序，调用freetype库，从Windows的字库文件中抽取出字模。但是freetype在windows上没有安装成功，所以就下载了一个字体编辑软件FontForge，用它从Windows的字库文件中抽取出字模，导出为XBM格式的图片文件，再编写一个程序，将其转换成oled可用的格式。
FontForge
用这个软件打开Windows的字库文件，找到需要的汉字，导出成X Bitmap文件，导出时Pixel Size填写31，这样导出的是32x32点阵的字模。
XBM格式
导出的图片文件用文本编辑打开：
#define uni6E29_SimHei_width 32
#define uni6E29_SimHei_height 32
static unsigned char uni6E29_SimHei_bits[] = {
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x38, 0xf8, 0xff, 0x03,
0x78, 0xf8, 0xff, 0x03,
0xe0, 0x18, 0x00, 0x03,
0xc0, 0x19, 0x00, 0x03,
0x80, 0x18, 0x00, 0x03,
0x00, 0xf8, 0xff, 0x03,
0x00, 0xf8, 0xff, 0x03,
0x0c, 0x18, 0x00, 0x03,
0x3c, 0x18, 0x00, 0x03,
0x70, 0x18, 0x00, 0x03,
0x60, 0xf8, 0xff, 0x03,
0x00, 0xf8, 0xff, 0x03,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x20, 0x00, 0x00, 0x00,
0x60, 0xfc, 0xff, 0x07,
0x60, 0xfc, 0xff, 0x07,
0x70, 0x8c, 0x31, 0x06,
0x30, 0x8c, 0x31, 0x06,
0x30, 0x8c, 0x31, 0x06,
0x38, 0x8c, 0x31, 0x06,
0x18, 0x8c, 0x31, 0x06,
0x18, 0x8c, 0x31, 0x06,
0x1c, 0x8c, 0x31, 0x06,
0x9c, 0xff, 0xff, 0x3f,
0x88, 0xff, 0xff, 0x3f,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00
};
这种格式非常适合嵌入到代码中。
转换程序
0.91吋oled用的是SSD1306驱动，我用的显示方式是Vertical addressing mode，需要将上面的点阵进行转换，转换代码如下：
#include 执行上面的代码，打印如下：
*** ***************
**** ***************
*** ** **
*** ** **
* ** **
***************
***************
** ** **
**** ** **
*** ** **
** ***************
***************
*
** *****************
** *****************
*** ** ** ** **
** ** ** ** **
** ** ** ** **
*** ** ** ** **
** ** ** ** **
** ** ** ** **
*** ** ** ** **
*** ***********************
* ***********************
const int8_t font [] =
{
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x18, 0x00, 0x18,
0x30, 0x18, 0x00, 0x3f,
0x30, 0x30, 0xe0, 0x1f,
0x70, 0x70, 0xfc, 0x01,
0xe0, 0x60, 0x38, 0x00,
0xc0, 0x01, 0x00, 0x30,
0x80, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0xf8, 0x3f,
0xf0, 0xff, 0xf8, 0x3f,
0xf0, 0xff, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0xf0, 0xff, 0x18, 0x30,
0xf0, 0xff, 0xf8, 0x3f,
0x00, 0x00, 0xf8, 0x3f,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
打印出来的数组就是转换后的字模。可以拷贝到oled显示代码里
const int8_t wen_font [] =
{
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
0x00, 0x18, 0x00, 0x18,
0x30, 0x18, 0x00, 0x3f,
0x30, 0x30, 0xe0, 0x1f,
0x70, 0x70, 0xfc, 0x01,
0xe0, 0x60, 0x38, 0x00,
0xc0, 0x01, 0x00, 0x30,
0x80, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0xf8, 0x3f,
0xf0, 0xff, 0xf8, 0x3f,
0xf0, 0xff, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0xf8, 0x3f,
0x30, 0xc6, 0x18, 0x30,
0x30, 0xc6, 0x18, 0x30,
0xf0, 0xff, 0x18, 0x30,
0xf0, 0xff, 0xf8, 0x3f,
0x00, 0x00, 0xf8, 0x3f,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x30,
0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00,
};
void ICACHE_FLASH_ATTR oled_write_wen(int x)
{
int i;
oled_write_cmd(0x20);//Set Memory Addressing Mode
oled_write_cmd(0x01);//Vertical Addressing Mode
oled_write_cmd(0x21);//Set Column Address
oled_write_cmd(x);//Column start address
oled_write_cmd(32+x);//Column end address
oled_write_cmd(0x22);//Set Page Address
oled_write_cmd(0x0);//Page start address
oled_write_cmd(3);//Page end address
for(i=0;i<32*4;i++)
oled_write_data(wen_font[i]);
oled_write_cmd(0x21);//Set Column Address
oled_write_cmd(0x0);//Column start address
oled_write_cmd(127);//Column end address
oled_write_cmd(0x22);//Set Page Address
oled_write_cmd(0x0);//Page start address
oled_write_cmd(3);//Page end address
return;
}