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v3S-驱动-i2c-OLED屏幕

 收录于 荔枝派V3S Linux
   约 898 字   预计阅读 2 分钟 
https://bing.ee123.net/img/rand?artid=120042419

v3S 驱动 i2c OLED屏幕

文章目录

一、硬件连接

https://i-blog.csdnimg.cn/blog_migrate/89bd01c00703440ebad2848d03bd25f2.png

二、配置内核

默认是选中的 （可以跳过这一步）

在linux源代码下执行

make menuconfig

选中 <*> Solomon SSD1307 framebuffer support

直接搜索 FB_SSD1307

https://i-blog.csdnimg.cn/blog_migrate/ff579d5bf6a616c23c147d76d3d44264.png

按1进入

https://i-blog.csdnimg.cn/blog_migrate/061c5fa27859e13f63b646f39caa3762.png

三、修改设备树文件

添加ssd1306fb-i2c节点，0x3c是i2c设备的地址

在sun8i-v3s-licheepi-zero-dock.dts中添加：

	ssd1306fb: ssd1306fb@3c {
        compatible = "solomon,ssd1306fb-i2c";
        reg = <0x3c>;
        solomon,width = <128>;
        solomon,height = <64>;
       /* reset-gpios = <&pio 1 0 GPIO_ACTIVE_HIGH>;*/  // 没有使用复位引脚 
        solomon,page-offset = <0>;
        solomon,com-invdir;
    };

https://i-blog.csdnimg.cn/blog_migrate/673017fad6cf7f507ac929ec7322026f.png

编译内核和编译dtb

因为内核没有修改，这里只编译设备树

make dtbs

https://i-blog.csdnimg.cn/blog_migrate/9a729e45ede7376e32df9aa9ee195c48.png

然后将设备树拷贝到开发板上，上电

四、运行测试

1. 打印日志

可以看到打印的日志：

https://i-blog.csdnimg.cn/blog_migrate/b6f414d9b20854f690f3e82cd7b3fcab.png

然后可以看到OLED有一个横杠闪烁。

2.简单操作

驱动注册后一般会挂载为/dev/fb0或者/dev/fb1设备文件。

我们查看一下

https://i-blog.csdnimg.cn/blog_migrate/467a23fa88b7ac759af3cad7cc4508f3.png

可以看到我们有两个fb设备，因为我有两个屏幕。

这里可以简单测试一下。

随机数：执行这个命令会让屏幕出现花屏现象，fb1可以改为fb0，这样可以看出两个屏幕的变化。

cat /dev/urandom > /dev/fb1

清屏：执行这个命令会让屏幕不显示

cat /dev/zero > /dev/fb1

2. 编写测试demo

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：

#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <linux/fb.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.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/fb0",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);
}

编译，拷贝

运行

https://i-blog.csdnimg.cn/blog_migrate/ddbc90512d992efdf220aa1ca22e6470.png

之后屏幕显示

https://i-blog.csdnimg.cn/blog_migrate/2ab5e5b298062ff58ace992021464eae.png

五、关于tty测试

关于tty的讲解（暂时还没有搞明白）

这里有个链接

测试:

输入

echo hello > /dev/tty0

https://i-blog.csdnimg.cn/blog_migrate/e3e64c27c8c735390049130d7d19f43f.png

会在OLED上显示输入的字符

https://i-blog.csdnimg.cn/blog_migrate/2951858de79896fd0c578eb972214084.png

六、修改屏幕显示终端信息

在uboot修改bootargs

setenv bootargs root=/dev/nfs rw nfsroot=192.168.1.4:/home/luatao/linux/nfs/rootfs ip=192.168.1.50:192.168.1.4:192.168.1.1:255.255.255.0::eth0:off init=/linuxrc console=ttyS0,115200 console=tty0

https://i-blog.csdnimg.cn/blog_migrate/a33ae764d8b5dbaf3237e9c7c7b7b809.png

在屏幕上就会打印出启动的信息，但实在是太慢了。（受不了）

https://i-blog.csdnimg.cn/blog_migrate/ff6aa5bb3fe1a1ab26267895cb4975ef.png

还是改回去

setenv bootargs root=/dev/nfs rw nfsroot=192.168.1.4:/home/luatao/linux/nfs/rootfs ip=192.168.1.50:192.168.1.4:192.168.1.1:255.255.255.0::eth0:off init=/linuxrc console=ttyS0,115200

https://i-blog.csdnimg.cn/blog_migrate/2cd46302a93d339bb49da34da7a1adb6.png

到这就基本完成了。

参考链接

更新于 2024-11-29
 物联网, Linux
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