點屏之I2C OLED · 荔枝派Zero指南

# 點屏之I2C OLED 此文摘自群友投稿文章，感謝群友 **星空** ## 1. 硬件連接一般市面上買到的單色oled屏幕模塊一般都是同時支持spi和i2c接口的，而默認一般都是spi接口模式，需要根據說明書調整模模塊上電阻的位置來轉換到i2c模式。我手中這個模塊一般比較常見，分辨率是128*64，需要焊接R1和R4，注意下方那個電阻位置要短接。 ![](https://box.kancloud.cn/b5224472a382d668d6cf0c12f0892538_739x557.jpg) ![](https://box.kancloud.cn/ce7036790bfaf95c2cf550c4bdac079b_833x431.jpg) 然后連接到zero的i2c0的位置，reset引腳我連接到了uart2的tx腳位置。我手中暫時沒有dock，如果是使用dock，請根據實際情況插到對應位置。 ## 2. ssd1307fb驅動配置 Oled使用的控制芯片是ssd1306，最新版本的linux中包含Ssd1306的i2c驅動，驅動加載后會注冊成功linux framebuffer，驅動文件路徑是：/drivers/video/fbdev/ssd1307fb.c，該驅動可以通過配置支持ssd130x系列芯片。所以要使用oled只需要在dts配置好就可以了進入linux目錄調出配置菜單 ~~~ /linux-zero-4.10.y$ make ARCH=arm menuconfig ~~~ 選中 <*> Solomon SSD1307 framebuffer support ![](https://box.kancloud.cn/aa91247dad30974e7c3058c7e5e28dea_850x391.jpg) ![](https://box.kancloud.cn/7d224ee935d3bd91da53556f8af4a5ed_918x404.jpg) 修改dts資源文件 ~~~ vi arch/arm/boot/dts/sun8i-v3s-licheepi-zero.dts ~~~ 添加ssd1306fb-i2c節點，0x3c是i2c設備的地址reset-getio是復位腳我選擇的是PB0， ![](https://box.kancloud.cn/0f551b1cb47649be68f5dd5629a7ea90_755x450.jpg) 接下來編譯內核和編譯dtb ~~~ make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j24 uImage make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- dtbs ~~~ 然后將內核和dtbs更新到zero上，插入串口上電。我是將驅動直接編譯到內核里，可以在內核日志中看到驅動加載成功。 ![](https://box.kancloud.cn/eafc995e356935d537d55d8599a5b62c_1512x268.jpg) 并且屏幕被點亮，該驅動默認不清空屏幕ram中內容，屏幕初始化后默認是花屏內容是正常的。如下狀態。 ![](https://box.kancloud.cn/c0bb555e7e7bfd8dc0a27cc56fc19514_630x545.jpg) 驅動注冊后一般會掛載為/dev/fb0或者/dev/fb1設備文件。寫一個簡單的oled模塊測試程序，讀取屏幕信息，并刷將荔枝派logo顯示上去效果如下： ![](https://box.kancloud.cn/5331e69baa77045940264e9f4c7d70ca_760x586.jpg) 首先用photoshop做出目標圖片，然后保存成bmp格式，然后使用windows自帶的畫圖工具打開bmp，然后點擊另存為保存為1位位圖格式。使用字模軟件將bmp轉換成程序用的字節序列，我用的是zimo221這款字模工具軟件 ![](https://box.kancloud.cn/66d0a0ff9a97c502f5e989765e2b921f_1196x802.jpg) 注意在參數設置中要勾選字節倒敘選項。下面寫一個測試程序，加載驅動并把圖像顯示到屏幕上 C測試程序 ~~~ #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); } ~~~ 將字節序在程序中定義為數組在荔枝板中，編譯程序并執行。 ![](https://box.kancloud.cn/533e4d22e84e1eaa42218f37d0b43dbd_648x299.jpg) ## 3. 單片機驅動移植為i2c驅動一般情況下使用ssb1307fb這個驅動就很完美了了，我在發現ssd1307fb這個驅動程序之前，我將顯示屏廠家提供的stm8 i2c測試代碼移植到了linux上實現了一個驅動，加載驅動后效果如下 ![](https://box.kancloud.cn/0bff0424a51d86f32442b91c374174d1_703x631.jpg) 我將此驅動也發出來供參考，該驅動程序直接在linux i2c設備注冊中實現了oled的測試顯示，該驅動包含一個基本ascii的字庫和字符串顯示邏輯。 ~~~ #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"); ~~~ 相應dts配置如下： ![](https://box.kancloud.cn/9a68c7be1bf1c3b3b9b9809cf18c156c_537x310.jpg)