Zero i2c oled使用指南

1. 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。

2. 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

~~ {.sourceCode .bash}
/linux-zero-4.10.y$ make ARCH=arm menuconfig
~~

选中 \<*> Solomon SSD1307 framebuffer support

修改dts资源文件

~~ {.sourceCode .bash}
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

~~ {.sourceCode .bash}
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

~~~~ {.sourceCode .c}

include

/*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[] = {
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0x40,0x18,0x04,0x06,0x84,0x30,0x40,0x04,0xFF,0xFF,0x03,0x00,0x00,0x00,0x00,0x06,
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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,
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0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x0F,0xFF,0xFF,0xFF,0x01,0x00,0x00,
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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。

3. 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。

~~~~ {.sourceCode .c}

include

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");
~~~~

相应dts配置如下：

wiki

Zero i2c oled使用指南

1. 硬件连接

2. ssd1307fb驱动配置

include

include

include

include

include

include

include

3. 单片机驱动一直为i2c驱动

include

include

include

include

include

include

include

include

include

define SSD1306_CMD 0

define SSD1306_DAT 1

define SSD1306_WIDTH 128

define SSD1306_HEIGHT 64

define SSD1306_TS_NAME "ssd1306_ts"