Zero i2c oled使用指南

    硬件连接

    一般市面上买到的单色oled屏幕模块一般都是同时支持spi和i2c接口的,而默认一般都是spi接口模式,需要根据说明书调整模模块上电阻的位置来转换到i2c模式。我手中这个模块一般比较常见,分辨率是128*64,需要焊接R1和R4,注意下方那个电阻位置要短接。

    然后连接到zero的i2c0的位置,reset引脚我连接到了uart2的tx脚位置。我手中暂时没有dock,如果是使用dock,请根据实际情况插到对应位置。

    ssd1307fb驱动配置

    Oled使用的控制芯片是 ssd1306,最新版本的linux中包含Ssd1306的i2c驱动,驱动加载后会注册成功linux framebuffer,驱动文件路径是: /drivers/video/fbdev/ssd1307fb.c ,该驱动可以通过配置支持ssd130x系列芯片。

    所以要使用oled只需要在dts配置好就可以了

    进入linux目录调出配置菜单

    /linux-zero-4.10.y$ make ARCH=arm menuconfig
    

    选中 \<*> Solomon SSD1307 framebuffer support

    修改dts资源文件

    vi arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts
    

    添加 ssd1306fb-i2c 节点,0x3c
    是i2c设备的地址,reset-getio是复位脚我选择的是*PB0*

    接下来编译内核和编译dtb

    make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j24 uImage
    make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs
    

    然后将内核和dtbs更新到zero上,插入串口上电。

    我是将驱动直接编译到内核里,可以在内核日志中看到驱动加载成功。

    并且屏幕被点亮,该驱动默认不清空屏幕ram中内容,屏幕初始化后默认是花屏内容是正常的。如下状态。

    驱动注册后一般会挂载为/dev/fb0或者/dev/fb1设备文件。

    写一个简单的oled模块测试程序,读取屏幕信息,并刷将荔枝派logo显示上去效果如下:

    首先用photoshop做出目标图片,然后保存成bmp格式,然后使用windows自带的画图工具打开bmp,然后点击另存为保存为1位位图格式。使用字模软件将bmp转换成程序用的字节序列,我用的是zimo221这款字模工具软件

    注意在参数设置中要勾选字节倒叙选项。

    下面写一个测试程序,加载驱动并把图像显示到屏幕上

    #include <unistd.h>
    #include <stdio.h>
    #include <fcntl.h>
    #include <linux/fb.h>
    #include <sys/mman.h>
    #include <stdlib.h>
    #include <string.h>
    
        /*seconds: the seconds; mseconds: the micro seconds*/
        void setTimer(int seconds, int mseconds)
    {
        struct timeval temp;
        temp.tv_sec = seconds;
        temp.tv_usec = mseconds;
        printf("timer1\n");
        select(0, NULL, NULL, NULL, &temp);
        printf("timer2\n");
        return ;
    }
    
    int main ()
    {
        char lichee[] = {
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0xE0,0x00,0x04,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x60,0x00,0x06,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x06,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x07,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0xC0,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x07,0x3C,0x74,0xE0,0x81,0x03,0xE0,0x0F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x22,0x8C,0x10,0x43,0x04,0xF0,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x42,0x84,0x10,0x22,0x0C,0xF8,0x1F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x03,0x84,0x08,0x22,0x08,0xFC,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x01,0x84,0x18,0x22,0x08,0xFE,0x3F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x01,0x84,0x18,0x20,0x00,0xFE,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x00,0x04,0x01,0x84,0x08,0x20,0x00,0xFE,0x7F,0x00,0x00,0x00,0x00,0x00,0x00,
            0x40,0x10,0x04,0x03,0x84,0x18,0x20,0x00,0xFE,0xFF,0x00,0x00,0x00,0x00,0x00,0x08,
            0x40,0x10,0x04,0x02,0x84,0x10,0x22,0x00,0xFF,0xFF,0x01,0x00,0x00,0x00,0x00,0x0C,
            0x40,0x18,0x04,0x06,0x84,0x30,0x40,0x04,0xFF,0xFF,0x03,0x00,0x00,0x00,0x00,0x06,
            0xE0,0x0F,0x1F,0x1C,0xCE,0xC1,0x80,0x03,0xFF,0xFF,0x07,0x00,0x00,0x00,0x00,0x07,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xFF,0xFF,0x0F,0x00,0x00,0x00,0x80,0x07,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xBF,0xFF,0x1F,0x00,0x00,0x00,0xC0,0x07,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xDF,0xFF,0x7F,0x00,0x00,0x00,0xE0,0x07,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xC7,0xFF,0xFF,0x00,0x00,0x00,0xF0,0x03,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xC9,0xFF,0xFF,0x01,0x00,0x00,0xF0,0x03,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40,0xC0,0xFF,0xFF,0x03,0x00,0x00,0xF8,0x03,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xC0,0xFF,0xFF,0x07,0x00,0x00,0xF0,0x03,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x40,0xC0,0xF7,0xFF,0x0F,0x00,0x00,0xF8,0x03,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xC0,0xE3,0xFF,0xFF,0x1F,0x00,0x00,0xF8,0x01,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xEF,0xFF,0xFF,0x7F,0x00,0x00,0xF8,0x01,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xFB,0xFF,0xFF,0xFF,0x00,0x00,0xFC,0x01,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xFF,0xFF,0xFF,0xFF,0x03,0x00,0xFC,0x00,
            0x40,0x30,0x00,0x06,0x04,0x00,0x00,0x80,0xFF,0xFF,0xFF,0xFF,0x07,0x00,0xFE,0x00,
            0x40,0x10,0x02,0x06,0x04,0xC0,0x00,0x9C,0xFF,0xFF,0xFF,0xFF,0x0F,0x00,0xFF,0x00,
            0xFE,0xFF,0x07,0x06,0x04,0x80,0xC8,0x81,0xFF,0xFF,0xFF,0xFF,0x3F,0x00,0x7F,0x00,
            0x40,0x10,0x00,0x06,0x04,0x80,0x08,0x00,0xFF,0xFF,0xFF,0xFF,0x7F,0x80,0x7F,0x00,
            0x40,0x13,0x00,0x16,0xCC,0x00,0x08,0x10,0xFF,0xFF,0xFF,0xFF,0xFF,0xC0,0x7F,0x00,
            0x00,0xC3,0xC0,0x3F,0x04,0x00,0x08,0x0E,0xFE,0xFF,0xFF,0xFF,0xFF,0xE3,0x3F,0x00,
            0x00,0xC1,0x00,0x06,0x04,0x10,0x48,0x00,0xFE,0xFF,0xFF,0xFF,0xFF,0xF7,0x3F,0x00,
            0x80,0x41,0x00,0x06,0x04,0x20,0x49,0x00,0xFE,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x00,
            0x80,0x40,0x00,0x0E,0x44,0x20,0x48,0x30,0xFC,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x00,
            0x60,0x78,0x00,0x9F,0x61,0x80,0x48,0x08,0xF8,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x00,
            0x38,0x30,0x00,0x17,0x60,0x80,0x48,0x02,0xF8,0xFF,0xFF,0xFF,0xFF,0xFF,0x3F,0x00,
            0x20,0x60,0x00,0x17,0x21,0x80,0x48,0x02,0xF0,0xFF,0xFF,0xFF,0xFF,0xFF,0x1F,0x00,
            0xFE,0xFB,0x83,0x06,0x30,0x40,0x48,0x02,0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0x1F,0x00,
            0x30,0x23,0x02,0x06,0x12,0x70,0x44,0x04,0xC0,0xFF,0xFF,0xFF,0xFF,0xFF,0x0F,0x00,
            0x30,0x23,0x42,0x06,0x1A,0x60,0x44,0x04,0x80,0xFF,0xFF,0xFF,0xFF,0xFF,0x07,0x00,
            0x10,0x31,0x02,0x06,0x0C,0x40,0x44,0x08,0x80,0xFF,0xFF,0xFF,0xFF,0xFF,0x03,0x00,
            0x18,0x11,0x03,0x06,0x0E,0x60,0x42,0x18,0xC0,0xFF,0xFF,0xFF,0xFF,0xFF,0x01,0x00,
            0x88,0x19,0x03,0x06,0x31,0x60,0xC2,0x30,0xE0,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,
            0xC4,0xCD,0x01,0x86,0xE0,0x61,0x41,0x20,0xE0,0xFF,0xFF,0xFF,0xFF,0x7F,0x00,0x00,
            0x00,0x82,0x01,0x36,0x80,0x00,0x00,0x00,0xF0,0xFF,0xFF,0xFF,0xFF,0x1F,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x9F,0xFF,0xFF,0xFF,0x07,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x0F,0xFF,0xFF,0xFF,0x01,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x03,0xFC,0xFF,0x7F,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF0,0xFF,0x0F,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x7F,0x00,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x01,0x00,0x00,0x00,
            0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00
        };
        int fp=0;
        long screensize=0;
    
        char *fbp = 0;
    
        struct fb_var_screeninfo vinfo;
        struct fb_fix_screeninfo finfo;
        fp = open ("/dev/fb1",O_RDWR);
    
        if (fp < 0){
            printf("Error : Can not open framebuffer device/n");
            exit(1);
        }
    
        if (ioctl(fp,FBIOGET_FSCREENINFO,&finfo)){
            printf("Error reading fixed information/n");
            exit(2);
        }
    
        if (ioctl(fp,FBIOGET_VSCREENINFO,&vinfo)){
            printf("Error reading variable information/n");
            exit(3);
        }
    
        printf("The mem is :%d\n",finfo.smem_len);
        printf("The line_length is :%d\n",finfo.line_length);
        printf("The xres is :%d\n",vinfo.xres);
        printf("The yres is :%d\n",vinfo.yres);
        printf("bits_per_pixel is :%d\n",vinfo.bits_per_pixel);
    
        screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8;
        printf("screensize: %d\n",screensize);
        fbp =(char *) mmap (0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED,
            fp,0);
        if ((int) fbp == -1)
        {
            printf ("Error: failed to map framebuffer device to memory./n");
            exit (4);
        }
    
        int i=0;
        memset(fbp, 0x00, 1024);
        setTimer(3,0);
        while(1){
            for(i=0;i<1024;i++){
                fbp[i]=lichee[i];
            }
            setTimer(3,0);
            memset(fbp, 0x00, 1024);
            setTimer(3,0);
        }
        munmap (fbp, screensize);
        close (fp);
    }
    

    将字节序在程序中定义为数组在荔枝板中,编译程序并执行。

    单片机驱动一直为i2c驱动

    一般情况下使用ssb1307fb这个驱动就很完美了了,我在发现ssd1307fb这个驱动程序之前,我将显示屏厂家提供的stm8
    i2c测试代码移植到了linux上实现了一个驱动,加载驱动后效果如下

    我将此驱动也发出来供参考,该驱动程序直接在linux
    i2c设备注册中实现了oled的测试显示,该驱动包含一个基本ascii的字库和字符串显示逻辑。

    #include <linux/kernel.h>
    #include <linux/init.h>
    #include <linux/module.h>
    #include <linux/slab.h>
    #include <linux/jiffies.h>
    #include <linux/i2c.h>
    #include <linux/mutex.h>
    #include <linux/fs.h>
    #include <asm/uaccess.h>
    
    
    #define SSD1306_CMD    0
    #define SSD1306_DAT    1
    
    #define SSD1306_WIDTH    128
    #define SSD1306_HEIGHT  64
    
    #define SSD1306_TS_NAME "ssd1306_ts"
    
    static uint8_t s_chDispalyBuffer[128][8];
    
    const uint8_t c_chFont1608[95][16] = {
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*" ",0*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x1F,0xCC,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x00},/*"!",1*/
    {0x00,0x00,0x08,0x00,0x30,0x00,0x60,0x00,0x08,0x00,0x30,0x00,0x60,0x00,0x00,0x00},/*""",2*/
    {0x02,0x20,0x03,0xFC,0x1E,0x20,0x02,0x20,0x03,0xFC,0x1E,0x20,0x02,0x20,0x00,0x00},/*"#",3*/
    {0x00,0x00,0x0E,0x18,0x11,0x04,0x3F,0xFF,0x10,0x84,0x0C,0x78,0x00,0x00,0x00,0x00},/*"$",4*/
    {0x0F,0x00,0x10,0x84,0x0F,0x38,0x00,0xC0,0x07,0x78,0x18,0x84,0x00,0x78,0x00,0x00},/*"%",5*/
    {0x00,0x78,0x0F,0x84,0x10,0xC4,0x11,0x24,0x0E,0x98,0x00,0xE4,0x00,0x84,0x00,0x08},/*"&",6*/
    {0x08,0x00,0x68,0x00,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"'",7*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x07,0xE0,0x18,0x18,0x20,0x04,0x40,0x02,0x00,0x00},/*"(",8*/
    {0x00,0x00,0x40,0x02,0x20,0x04,0x18,0x18,0x07,0xE0,0x00,0x00,0x00,0x00,0x00,0x00},/*")",9*/
    {0x02,0x40,0x02,0x40,0x01,0x80,0x0F,0xF0,0x01,0x80,0x02,0x40,0x02,0x40,0x00,0x00},/*"*",10*/
    {0x00,0x80,0x00,0x80,0x00,0x80,0x0F,0xF8,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x00},/*"+",11*/
    {0x00,0x01,0x00,0x0D,0x00,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*",",12*/
    {0x00,0x00,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80,0x00,0x80},/*"-",13*/
    {0x00,0x00,0x00,0x0C,0x00,0x0C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*".",14*/
    {0x00,0x00,0x00,0x06,0x00,0x18,0x00,0x60,0x01,0x80,0x06,0x00,0x18,0x00,0x20,0x00},/*"/",15*/
    {0x00,0x00,0x07,0xF0,0x08,0x08,0x10,0x04,0x10,0x04,0x08,0x08,0x07,0xF0,0x00,0x00},/*"0",16*/
    {0x00,0x00,0x08,0x04,0x08,0x04,0x1F,0xFC,0x00,0x04,0x00,0x04,0x00,0x00,0x00,0x00},/*"1",17*/
    {0x00,0x00,0x0E,0x0C,0x10,0x14,0x10,0x24,0x10,0x44,0x11,0x84,0x0E,0x0C,0x00,0x00},/*"2",18*/
    {0x00,0x00,0x0C,0x18,0x10,0x04,0x11,0x04,0x11,0x04,0x12,0x88,0x0C,0x70,0x00,0x00},/*"3",19*/
    {0x00,0x00,0x00,0xE0,0x03,0x20,0x04,0x24,0x08,0x24,0x1F,0xFC,0x00,0x24,0x00,0x00},/*"4",20*/
    {0x00,0x00,0x1F,0x98,0x10,0x84,0x11,0x04,0x11,0x04,0x10,0x88,0x10,0x70,0x00,0x00},/*"5",21*/
    {0x00,0x00,0x07,0xF0,0x08,0x88,0x11,0x04,0x11,0x04,0x18,0x88,0x00,0x70,0x00,0x00},/*"6",22*/
    {0x00,0x00,0x1C,0x00,0x10,0x00,0x10,0xFC,0x13,0x00,0x1C,0x00,0x10,0x00,0x00,0x00},/*"7",23*/
    {0x00,0x00,0x0E,0x38,0x11,0x44,0x10,0x84,0x10,0x84,0x11,0x44,0x0E,0x38,0x00,0x00},/*"8",24*/
    {0x00,0x00,0x07,0x00,0x08,0x8C,0x10,0x44,0x10,0x44,0x08,0x88,0x07,0xF0,0x00,0x00},/*"9",25*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x03,0x0C,0x03,0x0C,0x00,0x00,0x00,0x00,0x00,0x00},/*":",26*/
    {0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*";",27*/
    {0x00,0x00,0x00,0x80,0x01,0x40,0x02,0x20,0x04,0x10,0x08,0x08,0x10,0x04,0x00,0x00},/*"<",28*/
    {0x02,0x20,0x02,0x20,0x02,0x20,0x02,0x20,0x02,0x20,0x02,0x20,0x02,0x20,0x00,0x00},/*"=",29*/
    {0x00,0x00,0x10,0x04,0x08,0x08,0x04,0x10,0x02,0x20,0x01,0x40,0x00,0x80,0x00,0x00},/*">",30*/
    {0x00,0x00,0x0E,0x00,0x12,0x00,0x10,0x0C,0x10,0x6C,0x10,0x80,0x0F,0x00,0x00,0x00},/*"?",31*/
    {0x03,0xE0,0x0C,0x18,0x13,0xE4,0x14,0x24,0x17,0xC4,0x08,0x28,0x07,0xD0,0x00,0x00},/*"@",32*/
    {0x00,0x04,0x00,0x3C,0x03,0xC4,0x1C,0x40,0x07,0x40,0x00,0xE4,0x00,0x1C,0x00,0x04},/*"A",33*/
    {0x10,0x04,0x1F,0xFC,0x11,0x04,0x11,0x04,0x11,0x04,0x0E,0x88,0x00,0x70,0x00,0x00},/*"B",34*/
    {0x03,0xE0,0x0C,0x18,0x10,0x04,0x10,0x04,0x10,0x04,0x10,0x08,0x1C,0x10,0x00,0x00},/*"C",35*/
    {0x10,0x04,0x1F,0xFC,0x10,0x04,0x10,0x04,0x10,0x04,0x08,0x08,0x07,0xF0,0x00,0x00},/*"D",36*/
    {0x10,0x04,0x1F,0xFC,0x11,0x04,0x11,0x04,0x17,0xC4,0x10,0x04,0x08,0x18,0x00,0x00},/*"E",37*/
    {0x10,0x04,0x1F,0xFC,0x11,0x04,0x11,0x00,0x17,0xC0,0x10,0x00,0x08,0x00,0x00,0x00},/*"F",38*/
    {0x03,0xE0,0x0C,0x18,0x10,0x04,0x10,0x04,0x10,0x44,0x1C,0x78,0x00,0x40,0x00,0x00},/*"G",39*/
    {0x10,0x04,0x1F,0xFC,0x10,0x84,0x00,0x80,0x00,0x80,0x10,0x84,0x1F,0xFC,0x10,0x04},/*"H",40*/
    {0x00,0x00,0x10,0x04,0x10,0x04,0x1F,0xFC,0x10,0x04,0x10,0x04,0x00,0x00,0x00,0x00},/*"I",41*/
    {0x00,0x03,0x00,0x01,0x10,0x01,0x10,0x01,0x1F,0xFE,0x10,0x00,0x10,0x00,0x00,0x00},/*"J",42*/
    {0x10,0x04,0x1F,0xFC,0x11,0x04,0x03,0x80,0x14,0x64,0x18,0x1C,0x10,0x04,0x00,0x00},/*"K",43*/
    {0x10,0x04,0x1F,0xFC,0x10,0x04,0x00,0x04,0x00,0x04,0x00,0x04,0x00,0x0C,0x00,0x00},/*"L",44*/
    {0x10,0x04,0x1F,0xFC,0x1F,0x00,0x00,0xFC,0x1F,0x00,0x1F,0xFC,0x10,0x04,0x00,0x00},/*"M",45*/
    {0x10,0x04,0x1F,0xFC,0x0C,0x04,0x03,0x00,0x00,0xE0,0x10,0x18,0x1F,0xFC,0x10,0x00},/*"N",46*/
    {0x07,0xF0,0x08,0x08,0x10,0x04,0x10,0x04,0x10,0x04,0x08,0x08,0x07,0xF0,0x00,0x00},/*"O",47*/
    {0x10,0x04,0x1F,0xFC,0x10,0x84,0x10,0x80,0x10,0x80,0x10,0x80,0x0F,0x00,0x00,0x00},/*"P",48*/
    {0x07,0xF0,0x08,0x18,0x10,0x24,0x10,0x24,0x10,0x1C,0x08,0x0A,0x07,0xF2,0x00,0x00},/*"Q",49*/
    {0x10,0x04,0x1F,0xFC,0x11,0x04,0x11,0x00,0x11,0xC0,0x11,0x30,0x0E,0x0C,0x00,0x04},/*"R",50*/
    {0x00,0x00,0x0E,0x1C,0x11,0x04,0x10,0x84,0x10,0x84,0x10,0x44,0x1C,0x38,0x00,0x00},/*"S",51*/
    {0x18,0x00,0x10,0x00,0x10,0x04,0x1F,0xFC,0x10,0x04,0x10,0x00,0x18,0x00,0x00,0x00},/*"T",52*/
    {0x10,0x00,0x1F,0xF8,0x10,0x04,0x00,0x04,0x00,0x04,0x10,0x04,0x1F,0xF8,0x10,0x00},/*"U",53*/
    {0x10,0x00,0x1E,0x00,0x11,0xE0,0x00,0x1C,0x00,0x70,0x13,0x80,0x1C,0x00,0x10,0x00},/*"V",54*/
    {0x1F,0xC0,0x10,0x3C,0x00,0xE0,0x1F,0x00,0x00,0xE0,0x10,0x3C,0x1F,0xC0,0x00,0x00},/*"W",55*/
    {0x10,0x04,0x18,0x0C,0x16,0x34,0x01,0xC0,0x01,0xC0,0x16,0x34,0x18,0x0C,0x10,0x04},/*"X",56*/
    {0x10,0x00,0x1C,0x00,0x13,0x04,0x00,0xFC,0x13,0x04,0x1C,0x00,0x10,0x00,0x00,0x00},/*"Y",57*/
    {0x08,0x04,0x10,0x1C,0x10,0x64,0x10,0x84,0x13,0x04,0x1C,0x04,0x10,0x18,0x00,0x00},/*"Z",58*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x7F,0xFE,0x40,0x02,0x40,0x02,0x40,0x02,0x00,0x00},/*"[",59*/
    {0x00,0x00,0x30,0x00,0x0C,0x00,0x03,0x80,0x00,0x60,0x00,0x1C,0x00,0x03,0x00,0x00},/*"\",60*/
    {0x00,0x00,0x40,0x02,0x40,0x02,0x40,0x02,0x7F,0xFE,0x00,0x00,0x00,0x00,0x00,0x00},/*"]",61*/
    {0x00,0x00,0x00,0x00,0x20,0x00,0x40,0x00,0x40,0x00,0x40,0x00,0x20,0x00,0x00,0x00},/*"^",62*/
    {0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01},/*"_",63*/
    {0x00,0x00,0x40,0x00,0x40,0x00,0x20,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"`",64*/
    {0x00,0x00,0x00,0x98,0x01,0x24,0x01,0x44,0x01,0x44,0x01,0x44,0x00,0xFC,0x00,0x04},/*"a",65*/
    {0x10,0x00,0x1F,0xFC,0x00,0x88,0x01,0x04,0x01,0x04,0x00,0x88,0x00,0x70,0x00,0x00},/*"b",66*/
    {0x00,0x00,0x00,0x70,0x00,0x88,0x01,0x04,0x01,0x04,0x01,0x04,0x00,0x88,0x00,0x00},/*"c",67*/
    {0x00,0x00,0x00,0x70,0x00,0x88,0x01,0x04,0x01,0x04,0x11,0x08,0x1F,0xFC,0x00,0x04},/*"d",68*/
    {0x00,0x00,0x00,0xF8,0x01,0x44,0x01,0x44,0x01,0x44,0x01,0x44,0x00,0xC8,0x00,0x00},/*"e",69*/
    {0x00,0x00,0x01,0x04,0x01,0x04,0x0F,0xFC,0x11,0x04,0x11,0x04,0x11,0x00,0x18,0x00},/*"f",70*/
    {0x00,0x00,0x00,0xD6,0x01,0x29,0x01,0x29,0x01,0x29,0x01,0xC9,0x01,0x06,0x00,0x00},/*"g",71*/
    {0x10,0x04,0x1F,0xFC,0x00,0x84,0x01,0x00,0x01,0x00,0x01,0x04,0x00,0xFC,0x00,0x04},/*"h",72*/
    {0x00,0x00,0x01,0x04,0x19,0x04,0x19,0xFC,0x00,0x04,0x00,0x04,0x00,0x00,0x00,0x00},/*"i",73*/
    {0x00,0x00,0x00,0x03,0x00,0x01,0x01,0x01,0x19,0x01,0x19,0xFE,0x00,0x00,0x00,0x00},/*"j",74*/
    {0x10,0x04,0x1F,0xFC,0x00,0x24,0x00,0x40,0x01,0xB4,0x01,0x0C,0x01,0x04,0x00,0x00},/*"k",75*/
    {0x00,0x00,0x10,0x04,0x10,0x04,0x1F,0xFC,0x00,0x04,0x00,0x04,0x00,0x00,0x00,0x00},/*"l",76*/
    {0x01,0x04,0x01,0xFC,0x01,0x04,0x01,0x00,0x01,0xFC,0x01,0x04,0x01,0x00,0x00,0xFC},/*"m",77*/
    {0x01,0x04,0x01,0xFC,0x00,0x84,0x01,0x00,0x01,0x00,0x01,0x04,0x00,0xFC,0x00,0x04},/*"n",78*/
    {0x00,0x00,0x00,0xF8,0x01,0x04,0x01,0x04,0x01,0x04,0x01,0x04,0x00,0xF8,0x00,0x00},/*"o",79*/
    {0x01,0x01,0x01,0xFF,0x00,0x85,0x01,0x04,0x01,0x04,0x00,0x88,0x00,0x70,0x00,0x00},/*"p",80*/
    {0x00,0x00,0x00,0x70,0x00,0x88,0x01,0x04,0x01,0x04,0x01,0x05,0x01,0xFF,0x00,0x01},/*"q",81*/
    {0x01,0x04,0x01,0x04,0x01,0xFC,0x00,0x84,0x01,0x04,0x01,0x00,0x01,0x80,0x00,0x00},/*"r",82*/
    {0x00,0x00,0x00,0xCC,0x01,0x24,0x01,0x24,0x01,0x24,0x01,0x24,0x01,0x98,0x00,0x00},/*"s",83*/
    {0x00,0x00,0x01,0x00,0x01,0x00,0x07,0xF8,0x01,0x04,0x01,0x04,0x00,0x00,0x00,0x00},/*"t",84*/
    {0x01,0x00,0x01,0xF8,0x00,0x04,0x00,0x04,0x00,0x04,0x01,0x08,0x01,0xFC,0x00,0x04},/*"u",85*/
    {0x01,0x00,0x01,0x80,0x01,0x70,0x00,0x0C,0x00,0x10,0x01,0x60,0x01,0x80,0x01,0x00},/*"v",86*/
    {0x01,0xF0,0x01,0x0C,0x00,0x30,0x01,0xC0,0x00,0x30,0x01,0x0C,0x01,0xF0,0x01,0x00},/*"w",87*/
    {0x00,0x00,0x01,0x04,0x01,0x8C,0x00,0x74,0x01,0x70,0x01,0x8C,0x01,0x04,0x00,0x00},/*"x",88*/
    {0x01,0x01,0x01,0x81,0x01,0x71,0x00,0x0E,0x00,0x18,0x01,0x60,0x01,0x80,0x01,0x00},/*"y",89*/
    {0x00,0x00,0x01,0x84,0x01,0x0C,0x01,0x34,0x01,0x44,0x01,0x84,0x01,0x0C,0x00,0x00},/*"z",90*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x00,0x3E,0xFC,0x40,0x02,0x40,0x02},/*"{",91*/
    {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0xFF,0x00,0x00,0x00,0x00,0x00,0x00},/*"|",92*/
    {0x00,0x00,0x40,0x02,0x40,0x02,0x3E,0xFC,0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00},/*"}",93*/
    {0x00,0x00,0x60,0x00,0x80,0x00,0x80,0x00,0x40,0x00,0x40,0x00,0x20,0x00,0x20,0x00},/*"~",94*/
    };
    
    struct i2c_client *ssd1306_client;
    
    static void ssd1306_write_byte(uint8_t chData, uint8_t chCmd)
    {
        uint8_t cmd = 0x00;
    
        if (chCmd) {
            cmd = 0x40;
        } else {
            cmd = 0x00;
        }
    
        i2c_smbus_write_byte_data(ssd1306_client, cmd, chData);
    }
    
    void ssd1306_display_on(void)
    {
        ssd1306_write_byte(0x8D, SSD1306_CMD);
        ssd1306_write_byte(0x14, SSD1306_CMD);
        ssd1306_write_byte(0xAF, SSD1306_CMD);
    }
    
    /**
      * @brief  OLED turns off
      *
      * @param  None
      *
      * @retval  None
    **/
    void ssd1306_display_off(void)
    {
        ssd1306_write_byte(0x8D, SSD1306_CMD);
        ssd1306_write_byte(0x10, SSD1306_CMD);
        ssd1306_write_byte(0xAE, SSD1306_CMD);
    }
    
    void ssd1306_refresh_gram(void)
    {
        uint8_t i, j;
    
        for (i = 0; i < 8; i ++) {
            ssd1306_write_byte(0xB0 + i, SSD1306_CMD);
            ssd1306_write_byte(0x02, SSD1306_CMD);
            ssd1306_write_byte(0x10, SSD1306_CMD);
            for (j = 0; j < 128; j ++) {
                ssd1306_write_byte(s_chDispalyBuffer[j][i], SSD1306_DAT);
            }
        }
    }
    
    
    void ssd1306_clear_screen(uint8_t chFill)
    {
        memset(s_chDispalyBuffer,chFill, sizeof(s_chDispalyBuffer));
        ssd1306_refresh_gram();
    }
    
    /**
      * @brief  Draws a piont on the screen
      *
      * @param  chXpos: Specifies the X position
      * @param  chYpos: Specifies the Y position
      * @param  chPoint: 0: the point turns off    1: the piont turns on
      *
      * @retval None
    **/
    
    void ssd1306_draw_point(uint8_t chXpos, uint8_t chYpos, uint8_t chPoint)
    {
        uint8_t chPos, chBx, chTemp = 0;
    
        if (chXpos > 127 || chYpos > 63) {
            return;
        }
        chPos = 7 - chYpos / 8; //
        chBx = chYpos % 8;
        chTemp = 1 << (7 - chBx);
    
        if (chPoint) {
            s_chDispalyBuffer[chXpos][chPos] |= chTemp;
    
        } else {
            s_chDispalyBuffer[chXpos][chPos] &= ~chTemp;
        }
    }
    
    /**
      * @brief  Fills a rectangle
      *
      * @param  chXpos1: Specifies the X position 1 (X top left position)
      * @param  chYpos1: Specifies the Y position 1 (Y top left position)
      * @param  chXpos2: Specifies the X position 2 (X bottom right position)
      * @param  chYpos3: Specifies the Y position 2 (Y bottom right position)
      *
      * @retval
    **/
    
    void ssd1306_fill_screen(uint8_t chXpos1, uint8_t chYpos1, uint8_t chXpos2, uint8_t chYpos2, uint8_t chDot)
    {
        uint8_t chXpos, chYpos;
    
        for (chXpos = chXpos1; chXpos <= chXpos2; chXpos ++) {
            for (chYpos = chYpos1; chYpos <= chYpos2; chYpos ++) {
                ssd1306_draw_point(chXpos, chYpos, chDot);
            }
        }
    
        ssd1306_refresh_gram();
    }
    
    
    /**
      * @brief Displays one character at the specified position
      *
      * @param  chXpos: Specifies the X position
      * @param  chYpos: Specifies the Y position
      * @param  chSize:
      * @param  chMode
      * @retval
    **/
    void ssd1306_display_char(uint8_t chXpos, uint8_t chYpos, uint8_t chChr, uint8_t chSize, uint8_t chMode)
    {
        uint8_t i, j;
        uint8_t chTemp, chYpos0 = chYpos;
    
        chChr = chChr - ' ';
        for (i = 0; i < chSize; i ++) {
            if (chMode) {
                chTemp = c_chFont1608[chChr][i];
            } else {
                chTemp = ~c_chFont1608[chChr][i];
            }
    
            for (j = 0; j < 8; j ++) {
                if (chTemp & 0x80) {
                    ssd1306_draw_point(chXpos, chYpos, 1);
                } else {
                    ssd1306_draw_point(chXpos, chYpos, 0);
                }
                chTemp <<= 1;
                chYpos ++;
    
                if ((chYpos - chYpos0) == chSize) {
                    chYpos = chYpos0;
                    chXpos ++;
                    break;
                }
            }
        }
    }
    
    /**
      * @brief  Displays a string on the screen
      *
      * @param  chXpos: Specifies the X position
      * @param  chYpos: Specifies the Y position
      * @param  pchString: Pointer to a string to display on the screen
      *
      * @retval  None
    **/
    void ssd1306_display_string(uint8_t chXpos, uint8_t chYpos, const uint8_t *pchString, uint8_t chSize, uint8_t chMode)
    {
    
    
    printk("%s, ssd1306 str = %s\n", __func__, pchString);
        while (*pchString != '\0') {
            if (chXpos > (SSD1306_WIDTH - chSize / 2)) {
                chXpos = 0;
                chYpos += chSize;
                if (chYpos > (SSD1306_HEIGHT - chSize)) {
                    chYpos = chXpos = 0;
                    ssd1306_clear_screen(0x00);
                }
            }
    
            ssd1306_display_char(chXpos, chYpos, *pchString, chSize, chMode);
            chXpos += chSize / 2;
            pchString ++;
        }
    }
    
    
    void ssd1306_init(void)
    {
        ssd1306_write_byte(0xAE, SSD1306_CMD);//--turn off oled panel
        ssd1306_write_byte(0x00, SSD1306_CMD);//---set low column address
        ssd1306_write_byte(0x10, SSD1306_CMD);//---set high column address
        ssd1306_write_byte(0x40, SSD1306_CMD);//--set start line address  Set Mapping RAM Display Start Line (0x00~0x3F)
        ssd1306_write_byte(0x81, SSD1306_CMD);//--set contrast control register
        ssd1306_write_byte(0xCF, SSD1306_CMD);// Set SEG Output Current Brightness
        ssd1306_write_byte(0xA1, SSD1306_CMD);//--Set SEG/Column Mapping
        ssd1306_write_byte(0xC0, SSD1306_CMD);//Set COM/Row Scan Direction
        ssd1306_write_byte(0xA6, SSD1306_CMD);//--set normal display
        ssd1306_write_byte(0xA8, SSD1306_CMD);//--set multiplex ratio(1 to 64)
        ssd1306_write_byte(0x3f, SSD1306_CMD);//--1/64 duty
        ssd1306_write_byte(0xD3, SSD1306_CMD);//-set display offset    Shift Mapping RAM Counter (0x00~0x3F)
        ssd1306_write_byte(0x00, SSD1306_CMD);//-not offset
        ssd1306_write_byte(0xd5, SSD1306_CMD);//--set display clock divide ratio/oscillator frequency
        ssd1306_write_byte(0x80, SSD1306_CMD);//--set divide ratio, Set Clock as 100 Frames/Sec
        ssd1306_write_byte(0xD9, SSD1306_CMD);//--set pre-charge period
        ssd1306_write_byte(0xF1, SSD1306_CMD);//Set Pre-Charge as 15 Clocks & Discharge as 1 Clock
        ssd1306_write_byte(0xDA, SSD1306_CMD);//--set com pins hardware configuration
        ssd1306_write_byte(0x12, SSD1306_CMD);
        ssd1306_write_byte(0xDB, SSD1306_CMD);//--set vcomh
        ssd1306_write_byte(0x40, SSD1306_CMD);//Set VCOM Deselect Level
        ssd1306_write_byte(0x20, SSD1306_CMD);//-Set Page Addressing Mode (0x00/0x01/0x02)
        ssd1306_write_byte(0x02, SSD1306_CMD);//
        ssd1306_write_byte(0x8D, SSD1306_CMD);//--set Charge Pump enable/disable
        ssd1306_write_byte(0x14, SSD1306_CMD);//--set(0x10) disable
        ssd1306_write_byte(0xA4, SSD1306_CMD);// Disable Entire Display On (0xa4/0xa5)
        ssd1306_write_byte(0xA6, SSD1306_CMD);// Disable Inverse Display On (0xa6/a7)
        ssd1306_write_byte(0xAF, SSD1306_CMD);//--turn on oled panel
    
        ssd1306_display_on();
        ssd1306_clear_screen(0xff);
    
    }
    
    
    static int ssd1306_ts_probe(struct i2c_client *client,
                               const struct i2c_device_id *id)
    {
    
     printk("ssd1306_ts_probe\n");
     printk("probe %s\n",__func__);
    printk("%s, addr = %x, line = %d\n", __func__, client->addr, client->adapter->nr);
    
    printk("%s, name = %s, adapter nr = %d\n", __func__, client->adapter->name, client->adapter->nr);
    
    
        ssd1306_client = client;
    
            ssd1306_init();
    
            ssd1306_clear_screen(0x00);
        //ssd1306_display_off();
    ssd1306_display_on();
        ssd1306_display_string(18, 0, "Welcome!", 16, 1);
        ssd1306_display_string(0, 16, "zero i2c driver", 16, 1);
        ssd1306_refresh_gram();
       // ssd1306_display_on();
    
            return 0;
    };
    
    
    static const struct i2c_device_id ssd1306_ts_id[] = {
            { "ssd1306", 0 },
            { }
    };
    MODULE_DEVICE_TABLE(i2c, ssd1306_ts_id);
    
    static struct i2c_driver ssd1306_ts_driver = {
            .probe = ssd1306_ts_probe,
            .id_table = ssd1306_ts_id,
            .driver = {
                    .name = SSD1306_TS_NAME,
            },
    };
    module_i2c_driver(ssd1306_ts_driver);
    MODULE_LICENSE("GPL");
    

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