图片转成oled使用的字模数据

oled尺寸

如何生成用到的图片

图片转字模

1.首先用Img2Lcd转成bmp单色图片

2.然后用PCtoLCD2002把单色图片转字模

oled尺寸

我使用0.96寸oled模块，对应着的分辨率是128*64，对应着宽高像素比128*64。所以不是随意一张图片就能用的，必须用128*64.

如何生成用到的图片

通过视频获取一张图片

ffmpeg -i 1.mp4 -y -f image2 -vframes 1 -s 128x64 output.jpg

-vframes 1 : 设置只提取 1 帧图像 , 也就是第 2 秒后的第一帧图像 ;

-s 128x64: 设置输出图片的大小为 128x64像素 ;

通过其他分辨率的图片获取图片

ffmpeg -i QQ.jpg -y -f image2 -s 128x64 output.jpg

最后获取下图：

图片转字模

1.首先用Img2Lcd转成bmp单色图片

2.然后用PCtoLCD2002把单色图片转字模

一、点击文件，打开要用的图片，如下图

二、选择图形模式

三、点击设置按钮，设置如下图，然后点击确定按钮

四、最后点击生成字模，然后保存字模到txt文本文件

五、然后把数据复制到代码里,需要注意分辨率为128*64，表示有128*64个位，那么对应128*8个字节，也就是1024。

const uint8_t image[1024] = {
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x00,0x40,
0x40,0x20,0x20,0x20,0x80,0x10,0x10,0x90,0x90,0x80,0x80,0x80,0x80,0xD0,0xD0,0xD0,
0xF0,0xA0,0xA0,0xA0,0xA0,0xC0,0xC0,0xC0,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0xC0,0x40,0x60,0x78,0x6C,0xA2,0xA1,0x31,0x48,0xE4,0xF0,
0xFA,0xFC,0xFF,0x3E,0x1E,0x1F,0x3F,0x3F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFD,0xF9,0xF1,0xE1,0x83,0x03,0x07,0x1E,0xFC,0xF8,0xF0,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x80,0xC0,0x60,0x90,0x58,0xA8,0x84,
0x74,0x02,0xE2,0x42,0x4F,0x18,0x30,0x20,0x20,0x60,0xB0,0x1F,0x06,0x10,0x3F,0x3F,
0x7F,0xFF,0xFF,0xFE,0xF2,0xF2,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFC,0xF0,0x7C,0x3F,0x1F,0x0F,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x08,
0x1E,0x12,0x01,0x11,0x18,0x38,0xC0,0x80,0x00,0x00,0x03,0x0E,0x05,0x07,0x87,0x98,
0xD0,0x60,0x63,0x6C,0x38,0x30,0x31,0x1F,0x30,0x60,0x41,0x81,0x82,0x86,0x80,0x80,
0x80,0x80,0x80,0xC1,0x43,0x7F,0x1F,0x1B,0x1B,0x1B,0x9B,0x9F,0xBF,0xBF,0x2F,0x4F,
0x4F,0x4F,0x8F,0x87,0xF7,0x0B,0x0B,0x07,0x07,0x01,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x80,0xC0,0x61,0x39,0x18,0x06,0xC6,0xE3,0xF1,0xF1,0xF0,
0x60,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x83,0x87,0x87,0x87,
0x87,0x03,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x03,0x03,
0x00,0x00,0x00,0x00,0x01,0x01,0x02,0x04,0x0C,0x18,0x30,0x60,0x80,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0xFC,0xFF,0xFF,0xF8,0xF0,0xC0,0xC0,0x80,0x81,0x80,0x80,0x80,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x07,0x0F,0x0F,0x0F,0x0F,0x0F,0x07,
0x07,0x07,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x78,0xFC,0xFC,0xFE,0x7E,0xBE,
0xFE,0xFE,0xFE,0xFE,0xFE,0xF8,0xE0,0x00,0x00,0x00,0x00,0x00,0x03,0xFF,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x03,0x0F,0x1F,0x3B,0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xE0,0xE0,0xE0,0xE0,0xE0,0xC0,0xE0,0xF0,0xF0,0xF0,
0xF8,0xF8,0xFC,0xFC,0xFC,0xFC,0xF8,0xF8,0xF0,0xC0,0xC0,0xC0,0xC0,0xC1,0xC1,0xC1,
0xE1,0xE3,0xE1,0xF1,0xF1,0xF0,0xF8,0xF8,0x68,0x34,0x1C,0x0E,0x07,0x01,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x03,0x03,0x07,
0x07,0x07,0x0F,0x0F,0x0F,0x1F,0x1F,0x1F,0x1F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,
0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x1F,0x1F,0x1F,0x1F,0x0F,0x0F,
0x0F,0x07,0x07,0x03,0x03,0x01,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};

这里给出一个如何使用字模数据的案例：

#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <linux/types.h>
#include <linux/spi/spidev.h>

#include "font.h"

#define OLED_IOC_INIT 			123
#define OLED_IOC_SET_POS 		124


//为0 表示命令，为1表示数据
#define OLED_CMD 	0
#define OLED_DATA 	1

	
static int fd_spidev;
static int dc_pin_num;
unsigned char OLED_DisplayBuf[8][128];

void OLED_DIsp_Set_Pos(int x, int y);

void oled_write_datas(const unsigned char *buf, int len)
{
	write(fd_spidev, buf, len);
}

		  			 		  						  					  				 	   		  	  	 	  		  			 		  						  					  				 	   		  	  	 	  

/**********************************************************************
	 * 函数名称： OLED_DIsp_Clear
	 * 功能描述： 整个屏幕显示数据清0
	 * 输入参数：无
	 * 输出参数： 无
	 * 返 回 值： 
	 * 修改日期 	   版本号	 修改人		  修改内容
	 * -----------------------------------------------
	 * 2020/03/15		 V1.0	  芯晓		  创建
 ***********************************************************************/
void OLED_DIsp_Clear(void)  
{
    unsigned char x, y;
	char buf[128];

	memset(buf, 0, 128);
	
    for (y = 0; y < 8; y++)
    {
        OLED_DIsp_Set_Pos(0, y);
        oled_write_datas(buf, 128);
    }
}

/**********************************************************************
	 * 函数名称： OLED_DIsp_All
	 * 功能描述： 整个屏幕显示全部点亮，可以用于检查坏点
	 * 输入参数：无
	 * 输出参数：无 
	 * 返 回 值：
	 * 修改日期 	   版本号	 修改人		  修改内容
	 * -----------------------------------------------
	 * 2020/03/15		 V1.0	  芯晓		  创建
 ***********************************************************************/
void OLED_DIsp_All(void)  
{
    unsigned char x, y;
	char buf[128];

	memset(buf, 0xff, 128);
	
    for (y = 0; y < 8; y++)
    {
        OLED_DIsp_Set_Pos(0, y);
        oled_write_datas(buf, 128);
    }



}

//坐标设置
/**********************************************************************
	 * 函数名称： OLED_DIsp_Set_Pos
	 * 功能描述：设置要显示的位置
	 * 输入参数：@ x ：要显示的column address
	 			@y :要显示的page address
	 * 输出参数： 无
	 * 返 回 值： 
	 * 修改日期 	   版本号	 修改人		  修改内容
	 * -----------------------------------------------
	 * 2020/03/15		 V1.0	  芯晓		  创建
 ***********************************************************************/
void OLED_DIsp_Set_Pos(int x, int y)
{ 	
	ioctl(fd_spidev, OLED_IOC_SET_POS, x  | (y << 8));
}   	      	   			 
/**********************************************************************
	  * 函数名称： OLED_DIsp_Char
	  * 功能描述：在某个位置显示字符 1-9
	  * 输入参数：@ x ：要显示的column address
		 			@y :要显示的page address
		 			@c ：要显示的字符的ascii码
	  * 输出参数： 无
	  * 返 回 值： 
	  * 修改日期		版本号	  修改人 	   修改内容
	  * -----------------------------------------------
	  * 2020/03/15		  V1.0	   芯晓		   创建
***********************************************************************/
void OLED_DIsp_Char(int x, int y, unsigned char c)
{
	int i = 0;
	/* 得到字模 */
	const unsigned char *dots = oled_asc2_8x16[c - ' '];

	/* 发给OLED */
	OLED_DIsp_Set_Pos(x, y);
	/* 发出8字节数据 */
	//for (i = 0; i < 8; i++)
	//	oled_write_cmd_data(dots[i], OLED_DATA);
	oled_write_datas(&dots[0], 8);

	OLED_DIsp_Set_Pos(x, y+1);
	/* 发出8字节数据 */
	//for (i = 0; i < 8; i++)
		//oled_write_cmd_data(dots[i+8], OLED_DATA);
	oled_write_datas(&dots[8], 8);
}


/**********************************************************************
	 * 函数名称： OLED_DIsp_String
	 * 功能描述： 在指定位置显示字符串
	 * 输入参数：@ x ：要显示的column address
		 			@y :要显示的page address
		 			@str ：要显示的字符串
	 * 输出参数： 无
	 * 返 回 值： 无
	 * 修改日期 	   版本号	 修改人		  修改内容
	 * -----------------------------------------------
	 * 2020/03/15		 V1.0	  芯晓		  创建
***********************************************************************/
void OLED_DIsp_String(int x, int y, char *str)
{
	unsigned char j=0;
	while (str[j])
	{		
		OLED_DIsp_Char(x, y, str[j]);//显示单个字符
		x += 8;
		if(x > 127)
		{
			x = 0;
			y += 2;
		}//移动显示位置
		j++;
	}
}
void OLED_Clear(void)
{
	uint8_t i, j;
	for (j = 0; j < 8; j ++)				//遍历8页
	{
		for (i = 0; i < 128; i ++)			//遍历128列
		{
			OLED_DisplayBuf[j][i] = 0x00;	//将显存数组数据全部清零
		}
	}
}

void OLED_DIsp_Image(int X, int Y, int Width, int Height, const unsigned char *Image)
{
	int i = 0, j = 0;
	int Page, Shift;

	/*遍历指定图像涉及的相关页*/
	/*(Height - 1) / 8 + 1的目的是Height / 8并向上取整*/
	for (j = 0; j < (Height - 1) / 8 + 1; j ++)
	{
		/*遍历指定图像涉及的相关列*/
		for (i = 0; i < Width; i ++)
		{
			if (X + i >= 0 && X + i <= 127)		//超出屏幕的内容不显示
			{
				/*负数坐标在计算页地址和移位时需要加一个偏移*/
				Page = Y / 8;
				Shift = Y % 8;
				if (Y < 0)
				{
					Page -= 1;
					Shift += 8;
				}
				
				if (Page + j >= 0 && Page + j <= 7)		//超出屏幕的内容不显示
				{
					/*显示图像在当前页的内容*/
					OLED_DisplayBuf[Page + j][X + i] |= Image[j * Width + i] << (Shift);
				}
				
				if (Page + j + 1 >= 0 && Page + j + 1 <= 7)		//超出屏幕的内容不显示
				{					
					/*显示图像在下一页的内容*/
					OLED_DisplayBuf[Page + j + 1][X + i] |= Image[j * Width + i] >> (8 - Shift);
				}
			}
		}
	}
	
	/*遍历每一页*/
	for (int j = 0; j < 8; j ++)
	{
		/*设置光标位置为每一页的第一列*/
		//OLED_SetCursor(j, 0);
		OLED_DIsp_Set_Pos(0,j);	
		/*连续写入128个数据，将显存数组的数据写入到OLED硬件*/
		//OLED_WriteData(OLED_DisplayBuf[j], 128);
		for(int t=0;t<128;t++)
		{//显示上半截字符	
			oled_write_datas(&OLED_DisplayBuf[j][t], 1);
		}	
	}
}

/**********************************************************************
	 * 函数名称： OLED_DIsp_Test
	 * 功能描述： 整个屏幕显示测试
	 * 输入参数：无
	 * 输出参数： 无
	 * 返 回 值： 无
	 * 修改日期 	   版本号	 修改人		  修改内容
	 * -----------------------------------------------
	 * 2020/03/15		 V1.0	  芯晓		  创建
 ***********************************************************************/
void OLED_DIsp_Test(void)
{ 	
	int i;
	OLED_DIsp_Image(0,0,128,64,image);
} 

/* spi_oled /dev/100ask_oled */
int main(int argc, char **argv)
{	
	if (argc != 2)
	{
		printf("Usage: %s /dev/100ask_oled\n", argv[0]);
		return -1;
	}

	fd_spidev = open(argv[1], O_RDWR);
	if (fd_spidev < 0) {
		printf("open %s err\n", argv[1]);
		return -1;
	}


	ioctl(fd_spidev, OLED_IOC_INIT);

	OLED_DIsp_Clear();
	
	OLED_DIsp_Test();

	return 0;
}

以上案例代码主要在OLED_DIsp_Image中，把图片数据填充到OLED_DisplayBuf二维数组中，然后调用 oled_write_datas写入oled显示。