详解0.9寸OLED驱动开发（linux platform tree i2c 应用实例）-编程知识

概述

1 认识OLED

1.1 OLED简介

1.2 SSD1306介绍

1.3 0.9寸OLED模块介绍

1.4 i2c操作OLED时序

2 驱动代码实现

2.1 查看i2c总线下Device

2.2 OLED驱动接口

2.2.1 初始化函数

2.2.2 写指令函数

2.2.3 其他接口函数

2.3 完整驱动代码

3 编译

3.1 编写测试程序

3.2 Makefile

4 验证

4.1 编译代码

4.2 执行程序

源代码下载地址：0.9寸OLED驱动程序，基于linuxplatformtree下I2C接口资源-CSDN文库

概述

本文详细介绍了SSD1306驱动型OLED的相关知识，并使用linux platform tree下的i2c驱动接口，实现该款OLED的驱动程序，并且编写了一个测试程序，验证其是否可靠。

1 认识OLED

1.1 OLED简介

OLED（有机发光二极管）是一种显示技术，它使用有机物质来发出光线。与传统液晶显示屏相比，OLED具有更高的对比度和更广的视角。它没有背光源，因此可以提供更深的黑色和更明亮的白色。

OLED显示屏由许多小的发光二极管组成，每个像素都可以独立发光。这意味着OLED显示屏可以实现真正的黑色，因为当像素关闭时，没有任何光线发射。

OLED具有快速的响应时间，因此在显示动态图像时可以提供更流畅的画面。此外，OLED显示屏拥有更宽广的视角，因此无论从哪个角度观看，图像都能保持清晰和准确。

OLED显示屏还具有较高的能源效率。因为每个像素都可以独立点亮，所以在显示黑色时可以关闭相应的像素，从而节省能源。

OLED技术可应用于各种设备，包括智能手机、电视、电子书阅读器、车载显示屏等。由于OLED显示屏的薄度和柔性，它还可以用于可弯曲的显示设备和可穿戴设备。

然而，OLED显示屏也有一些限制。首先，长时间显示相同的图像可能会导致“烧结”效应，即在屏幕上留下轮廓。其次，OLED显示屏的寿命相对较短，使用寿命通常较液晶显示屏更短。

总的来说，OLED技术在显示领域具有许多优势，如高对比度、广视角和能源效率。随着技术的不断发展，OLED显示屏将在各种设备中得到更广泛的应用。

1.2 SSD1306介绍

SSD1306是一款常用的单色OLED驱动芯片，由Solomon Systech Limited（国巨控股）设计和生产。它被广泛应用于各种嵌入式系统和电子设备中，用于驱动OLED显示屏。

SSD1306采用低功耗、高对比度和快速刷新率的技术，使得显示效果清晰亮丽。它具备128x64或128x32像素的分辨率，并支持四种显示模式：正常显示、反转显示、镜像显示和指令显示。SSD1306还可以通过I2C或SPI接口与微控制器或其他外部设备进行通信。

SSD1306内置了丰富的图形绘制和文本显示功能，可以轻松实现直线、矩形、圆形、位图等图形的绘制，以及字符、数字和自定义字体的显示。它还提供了多种显示模式和亮度调节选项，可以根据实际需求灵活控制显示效果。

SSD1306还具备内置的电源管理功能，支持低电压检测和电池电量显示，可以实现智能电源管理。此外，它还支持多种硬件和软件配置选项，方便用户进行定制化开发。

总的来说，SSD1306是一款功能强大、易于使用的OLED驱动芯片，适用于各种嵌入式系统和电子设备中，能够实现高质量、低功耗的显示效果。

1.3 0.9寸OLED模块介绍

笔者使用的0.9寸OLED模块，驱动芯片为SSD1306，该模块采用I2C驱动方式，对外有四个引脚：

1） GND: 电源地

2）VCC：电源正极，工作电压区间为3~5.5V

3）SCL: I2C 时钟引脚

4） SDA: I2C数据引脚

模块的原理图如下：

1.4 i2c操作OLED时序

关于i2c的详细信号分析，请参看文章：linux platform架构下I2C接口驱动开发-CSDN博客

这里只介绍使用i2c总线操作oled应该注意的操作：

I2C写时序是指在I2C通信中进行写操作时的时间顺序。以下是一般的I2C写时序：

主设备发送起始条件：主设备发送一个起始条件（Start）信号，通知从设备开始通信。
主设备发送器件地址：主设备发送要写入的从设备的地址。这个地址是由从设备的唯一I2C地址和读写位组成。
从设备响应：从设备根据接收到的地址信息，发送一个ACK信号（应答）给主设备，表示从设备已经准备好接收数据。
主设备发送数据：主设备发送要写入从设备的数据。
从设备响应：从设备接收到数据后，发送一个ACK信号给主设备，表示已经成功接收到数据。
可选的重复写操作：如果主设备需要继续向从设备写入数据，可以选择重复上述步骤。
主设备发送停止条件：主设备发送一个停止条件（Stop）信号，通知从设备结束通信。

注意：在I2C通信中，每个数据字节都需要从设备发送一个ACK信号以表示接收成功，如果从设备发送一个NACK信号（非应答），则表示接收失败或从设备不支持写操作。

下图为I2C 写OLED参数时序图:

2 驱动代码实现

2.1 查看i2c总线下Device

在终端使用i2c-tools，查看总线下设备地址信息，对于I2C设备，总线上挂载设备地址必须是唯一的，否则导致控制时序混乱，从而操作芯片失败。

使用Linux 环境下的i2c-tools工具，非常方便查看总线下的设备地址，命令如下：

i2cdetect -a 1

执行命令后，终端会打印如下信息：

2.2 OLED驱动接口

2.2.1 初始化函数

1）第128行，open函数打开驱动接口（i2c）

2）第137行，初始化i2c的工作模式（slave），并且传递设备地址（ 0x3c ）

2.2.2 写指令函数

1）参数介绍： data -- 传给ssd1306的数据

mode: 选择写命令还是写数据，mode = 1 为写数据， mode = 0, 此时写命令

2）第52行write函数为i2c 写接口，因为在linux platform tree框架下，所有驱动程序的读和写分别被封装为： read/write。这里直接调用write,就可以实现写操作了。

2.2.3 其他接口函数

包括：

1）清屏函数 oled_clear（）

2) 设置字符大小函数

3）关闭/打开显示

4）写字符/字符串函数

2.3 完整驱动代码

1）oled_dev.c

创建oled_dev.c文件，编写代码。完整代码如下

/***************************************************************
Copyright  2024-2029. All rights reserved.
文件名     : drv_oled.c
作者       : tangmingfei2013@126.com
版本       : V1.0
描述       : oled 驱动程序
其他       : 无
日志       : 初版V1.0 2024/02/23***************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <linux/fs.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include "drv_oled.h"
#include "font.h"#define DEV_FILE               "/dev/i2c-1"#define grayoled_swap(a, b)                                                    \(((a) ^= (b)), ((b) ^= (a)), ((a) ^= (b))) ///< No-temp-var swap operationstatic int fd = -1;
static unsigned char charSize=0; static int oled_write_reg( unsigned char data, unsigned char mode)
{int              ret = -1;unsigned char    buf[2] = {0};if( mode ){buf[0] = 0x40;}else{buf[0] = 0;}buf[1] = data;ret = write(fd, buf, 2);if( ret < 0 ){printf("write cmd to oled register failure.\n");return -1;}return 0;
}static void oled_drv_Init(void)
{ oled_write_reg(0xAE,PARA);//--display offoled_write_reg(0x00,PARA);//---set low column addressoled_write_reg(0x10,PARA);//---set high column addressoled_write_reg(0x40,PARA);//--set start line address  oled_write_reg(0xB0,PARA);//--set page addressoled_write_reg(0x81,PARA); // contract controloled_write_reg(0xFF,PARA);//--128   oled_write_reg(0xA1,PARA);//set segment remap oled_write_reg(0xA6,PARA);//--normal / reverseoled_write_reg(0xA8,PARA);//--set multiplex ratio(1 to 64)oled_write_reg(0x3F,PARA);//--1/32 dutyoled_write_reg(0xC8,PARA);//Com scan directionoled_write_reg(0xD3,PARA);//-set display offsetoled_write_reg(0x00,PARA);//oled_write_reg(0xD5,PARA);//set osc divisionoled_write_reg(0x80,PARA);//oled_write_reg(0xD8,PARA);//set area color mode offoled_write_reg(0x05,PARA);//oled_write_reg(0xD9,PARA);//Set Pre-Charge Periodoled_write_reg(0xF1,PARA);//oled_write_reg(0xDA,PARA);//set com pin configuartionoled_write_reg(0x12,PARA);//oled_write_reg(0xDB,PARA);//set Vcomholed_write_reg(0x30,PARA);//oled_write_reg(0x8D,PARA);//set charge pump enableoled_write_reg(0x14,PARA);//oled_write_reg(0xAF,PARA);//--turn on oled paneloled_clear();
}void oled_clear(void)  
{  unsigned char i,n;for(i=0;i<8;i++)  {  oled_write_reg (0xb0+i,PARA);   oled_write_reg (0x00,PARA);oled_write_reg (0x10,PARA); for( n = 0;n < 128; n++){oled_write_reg(0,DATA);} } 
}void oled_release( void )
{close( fd );
}int oled_init(void)
{// init i2c fd = open(DEV_FILE, O_RDWR);if( fd < 0 ){close( fd );printf("%s %s i2c device open failure: %s\n", __FILE__, __FUNCTION__, strerror(errno));return -1;}ioctl(fd, I2C_TENBIT, 0);ioctl(fd, I2C_SLAVE, OLED_ADDR);oled_drv_Init();return fd;
}/*oled 12864 API 
*/void oled_setCharSize( unsigned char val )
{charSize = val;
}void oled_setPostion( unsigned char x, unsigned char y) 
{oled_write_reg(0xb0+y,PARA);oled_write_reg(((x&0xf0)>>4)|0x10,PARA);oled_write_reg((x&0x0f),PARA); 
}void oled_displayOn(void)
{oled_write_reg(0X8D,PARA); oled_write_reg(0X14,PARA); oled_write_reg(0XAF,PARA);
}void oled_displayOff(void)
{oled_write_reg(0X8D,PARA);oled_write_reg(0X10,PARA);oled_write_reg(0XAE,PARA);
}void oled_upScreenOn(void)  
{  unsigned char i,n;for(i=0;i<8;i++)  {  oled_write_reg (0xb0+i,PARA);oled_write_reg (0x00,PARA); oled_write_reg (0x10,PARA);for(n=0;n<128;n++){oled_write_reg(1,DATA); }} 
}void oled_printfChar(unsigned char x,unsigned char y,unsigned char val )
{ unsigned char character = 0;unsigned char i=0;character = val-' ';if( x > X_WIDTH-1){x = 0;y += 2;}if( charSize == FONT_16 ){oled_setPostion(x,y);	for( i = 0; i < 8; i++){oled_write_reg(F8X16[character*16+i],DATA);}oled_setPostion(x,y+1);for(i=0;i<8;i++){oled_write_reg(F8X16[character*16+i+8],DATA);}}else {oled_setPostion(x,y);for(i=0;i<6;i++){oled_write_reg(F6x8[character][i],DATA);}}
}void oled_printfString(unsigned char x,unsigned char y,unsigned char *str  )
{unsigned char index = 0;while ( str[index]!='\0' ){oled_printfChar(x,y,str[index] );x += 8;if( x > 120 ){  x=0;y+=2;}index++;}
}void oled_printmutiChar(unsigned char x,unsigned char y,unsigned char *str,  unsigned char length )
{unsigned char index = 0;for( index = 0; index < length; index++ ){oled_printfChar(x,y,str[index] );x += 8;if( x > 120 ){  x=0;y+=2;}}
}/* Eed of this file */

2）创建drv_oled.h，编写如下代码：

#ifndef __DRV__OLED_H
#define __DRV__OLED_H#ifdef __cplusplus
extern "C" {
#endif#define OLED_ADDR          0x3ctypedef enum
{FONT_16 = 0,FONT_12 = 1,
}OLED_CHARSIZE;typedef enum
{PARA = 0,DATA = 0x40,
}OLED_PARE_REG;typedef enum
{X_WIDTH = 128,Y_WIDTH = 64,
}OLED_SCREEN_SIZE;int oled_init(void);
void oled_release( void );void oled_clear(void);void oled_setCharSize( unsigned char val );
void oled_setPostion( unsigned char x, unsigned char y) ;
void oled_displayOn(void);
void oled_displayOff(void);void oled_printfChar(unsigned char x,unsigned char y,unsigned char val );
void oled_printfString(unsigned char x,unsigned char y,unsigned char *str );#ifdef __cplusplus
}
#endif#endif /* __DRV__OLED_H */

3）字库文件font.h

#ifdef __cplusplus
extern "C" {
#endifconst unsigned char F6x8[][6] =
{
0x00, 0x00, 0x00, 0x00, 0x00, 0x00,// sp
0x00, 0x00, 0x00, 0x2f, 0x00, 0x00,// !
0x00, 0x00, 0x07, 0x00, 0x07, 0x00,// "
0x00, 0x14, 0x7f, 0x14, 0x7f, 0x14,// #
0x00, 0x24, 0x2a, 0x7f, 0x2a, 0x12,// $
0x00, 0x62, 0x64, 0x08, 0x13, 0x23,// %
0x00, 0x36, 0x49, 0x55, 0x22, 0x50,// &
0x00, 0x00, 0x05, 0x03, 0x00, 0x00,// '
0x00, 0x00, 0x1c, 0x22, 0x41, 0x00,// (
0x00, 0x00, 0x41, 0x22, 0x1c, 0x00,// )
0x00, 0x14, 0x08, 0x3E, 0x08, 0x14,// *
0x00, 0x08, 0x08, 0x3E, 0x08, 0x08,// +
0x00, 0x00, 0x00, 0xA0, 0x60, 0x00,// ,
0x00, 0x08, 0x08, 0x08, 0x08, 0x08,// -
0x00, 0x00, 0x60, 0x60, 0x00, 0x00,// .
0x00, 0x20, 0x10, 0x08, 0x04, 0x02,// /
0x00, 0x3E, 0x51, 0x49, 0x45, 0x3E,// 0
0x00, 0x00, 0x42, 0x7F, 0x40, 0x00,// 1
0x00, 0x42, 0x61, 0x51, 0x49, 0x46,// 2
0x00, 0x21, 0x41, 0x45, 0x4B, 0x31,// 3
0x00, 0x18, 0x14, 0x12, 0x7F, 0x10,// 4
0x00, 0x27, 0x45, 0x45, 0x45, 0x39,// 5
0x00, 0x3C, 0x4A, 0x49, 0x49, 0x30,// 6
0x00, 0x01, 0x71, 0x09, 0x05, 0x03,// 7
0x00, 0x36, 0x49, 0x49, 0x49, 0x36,// 8
0x00, 0x06, 0x49, 0x49, 0x29, 0x1E,// 9
0x00, 0x00, 0x36, 0x36, 0x00, 0x00,// :
0x00, 0x00, 0x56, 0x36, 0x00, 0x00,// ;
0x00, 0x08, 0x14, 0x22, 0x41, 0x00,// <
0x00, 0x14, 0x14, 0x14, 0x14, 0x14,// =
0x00, 0x00, 0x41, 0x22, 0x14, 0x08,// >
0x00, 0x02, 0x01, 0x51, 0x09, 0x06,// ?
0x00, 0x32, 0x49, 0x59, 0x51, 0x3E,// @
0x00, 0x7C, 0x12, 0x11, 0x12, 0x7C,// A
0x00, 0x7F, 0x49, 0x49, 0x49, 0x36,// B
0x00, 0x3E, 0x41, 0x41, 0x41, 0x22,// C
0x00, 0x7F, 0x41, 0x41, 0x22, 0x1C,// D
0x00, 0x7F, 0x49, 0x49, 0x49, 0x41,// E
0x00, 0x7F, 0x09, 0x09, 0x09, 0x01,// F
0x00, 0x3E, 0x41, 0x49, 0x49, 0x7A,// G
0x00, 0x7F, 0x08, 0x08, 0x08, 0x7F,// H
0x00, 0x00, 0x41, 0x7F, 0x41, 0x00,// I
0x00, 0x20, 0x40, 0x41, 0x3F, 0x01,// J
0x00, 0x7F, 0x08, 0x14, 0x22, 0x41,// K
0x00, 0x7F, 0x40, 0x40, 0x40, 0x40,// L
0x00, 0x7F, 0x02, 0x0C, 0x02, 0x7F,// M
0x00, 0x7F, 0x04, 0x08, 0x10, 0x7F,// N
0x00, 0x3E, 0x41, 0x41, 0x41, 0x3E,// O
0x00, 0x7F, 0x09, 0x09, 0x09, 0x06,// P
0x00, 0x3E, 0x41, 0x51, 0x21, 0x5E,// Q
0x00, 0x7F, 0x09, 0x19, 0x29, 0x46,// R
0x00, 0x46, 0x49, 0x49, 0x49, 0x31,// S
0x00, 0x01, 0x01, 0x7F, 0x01, 0x01,// T
0x00, 0x3F, 0x40, 0x40, 0x40, 0x3F,// U
0x00, 0x1F, 0x20, 0x40, 0x20, 0x1F,// V
0x00, 0x3F, 0x40, 0x38, 0x40, 0x3F,// W
0x00, 0x63, 0x14, 0x08, 0x14, 0x63,// X
0x00, 0x07, 0x08, 0x70, 0x08, 0x07,// Y
0x00, 0x61, 0x51, 0x49, 0x45, 0x43,// Z
0x00, 0x00, 0x7F, 0x41, 0x41, 0x00,// [
0x00, 0x55, 0x2A, 0x55, 0x2A, 0x55,// 55
0x00, 0x00, 0x41, 0x41, 0x7F, 0x00,// ]
0x00, 0x04, 0x02, 0x01, 0x02, 0x04,// ^
0x00, 0x40, 0x40, 0x40, 0x40, 0x40,// _
0x00, 0x00, 0x01, 0x02, 0x04, 0x00,// '
0x00, 0x20, 0x54, 0x54, 0x54, 0x78,// a
0x00, 0x7F, 0x48, 0x44, 0x44, 0x38,// b
0x00, 0x38, 0x44, 0x44, 0x44, 0x20,// c
0x00, 0x38, 0x44, 0x44, 0x48, 0x7F,// d
0x00, 0x38, 0x54, 0x54, 0x54, 0x18,// e
0x00, 0x08, 0x7E, 0x09, 0x01, 0x02,// f
0x00, 0x18, 0xA4, 0xA4, 0xA4, 0x7C,// g
0x00, 0x7F, 0x08, 0x04, 0x04, 0x78,// h
0x00, 0x00, 0x44, 0x7D, 0x40, 0x00,// i
0x00, 0x40, 0x80, 0x84, 0x7D, 0x00,// j
0x00, 0x7F, 0x10, 0x28, 0x44, 0x00,// k
0x00, 0x00, 0x41, 0x7F, 0x40, 0x00,// l
0x00, 0x7C, 0x04, 0x18, 0x04, 0x78,// m
0x00, 0x7C, 0x08, 0x04, 0x04, 0x78,// n
0x00, 0x38, 0x44, 0x44, 0x44, 0x38,// o
0x00, 0xFC, 0x24, 0x24, 0x24, 0x18,// p
0x00, 0x18, 0x24, 0x24, 0x18, 0xFC,// q
0x00, 0x7C, 0x08, 0x04, 0x04, 0x08,// r
0x00, 0x48, 0x54, 0x54, 0x54, 0x20,// s
0x00, 0x04, 0x3F, 0x44, 0x40, 0x20,// t
0x00, 0x3C, 0x40, 0x40, 0x20, 0x7C,// u
0x00, 0x1C, 0x20, 0x40, 0x20, 0x1C,// v
0x00, 0x3C, 0x40, 0x30, 0x40, 0x3C,// w
0x00, 0x44, 0x28, 0x10, 0x28, 0x44,// x
0x00, 0x1C, 0xA0, 0xA0, 0xA0, 0x7C,// y
0x00, 0x44, 0x64, 0x54, 0x4C, 0x44,// z
0x14, 0x14, 0x14, 0x14, 0x14, 0x14,// horiz lines
};/****************************************8*16************************************/
const unsigned char F8X16[]=  
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,// 00x00,0x00,0x00,0xF8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x33,0x30,0x00,0x00,0x00,//! 10x00,0x10,0x0C,0x06,0x10,0x0C,0x06,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//" 20x40,0xC0,0x78,0x40,0xC0,0x78,0x40,0x00,0x04,0x3F,0x04,0x04,0x3F,0x04,0x04,0x00,//# 30x00,0x70,0x88,0xFC,0x08,0x30,0x00,0x00,0x00,0x18,0x20,0xFF,0x21,0x1E,0x00,0x00,//$ 40xF0,0x08,0xF0,0x00,0xE0,0x18,0x00,0x00,0x00,0x21,0x1C,0x03,0x1E,0x21,0x1E,0x00,//% 50x00,0xF0,0x08,0x88,0x70,0x00,0x00,0x00,0x1E,0x21,0x23,0x24,0x19,0x27,0x21,0x10,//& 60x10,0x16,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//' 70x00,0x00,0x00,0xE0,0x18,0x04,0x02,0x00,0x00,0x00,0x00,0x07,0x18,0x20,0x40,0x00,//( 80x00,0x02,0x04,0x18,0xE0,0x00,0x00,0x00,0x00,0x40,0x20,0x18,0x07,0x00,0x00,0x00,//) 90x40,0x40,0x80,0xF0,0x80,0x40,0x40,0x00,0x02,0x02,0x01,0x0F,0x01,0x02,0x02,0x00,//* 100x00,0x00,0x00,0xF0,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x1F,0x01,0x01,0x01,0x00,//+ 110x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0xB0,0x70,0x00,0x00,0x00,0x00,0x00,//, 120x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,//- 130x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,0x00,0x00,//. 140x00,0x00,0x00,0x00,0x80,0x60,0x18,0x04,0x00,0x60,0x18,0x06,0x01,0x00,0x00,0x00,/// 150x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x0F,0x10,0x20,0x20,0x10,0x0F,0x00,//0 160x00,0x10,0x10,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//1 170x00,0x70,0x08,0x08,0x08,0x88,0x70,0x00,0x00,0x30,0x28,0x24,0x22,0x21,0x30,0x00,//2 180x00,0x30,0x08,0x88,0x88,0x48,0x30,0x00,0x00,0x18,0x20,0x20,0x20,0x11,0x0E,0x00,//3 190x00,0x00,0xC0,0x20,0x10,0xF8,0x00,0x00,0x00,0x07,0x04,0x24,0x24,0x3F,0x24,0x00,//4 200x00,0xF8,0x08,0x88,0x88,0x08,0x08,0x00,0x00,0x19,0x21,0x20,0x20,0x11,0x0E,0x00,//5 210x00,0xE0,0x10,0x88,0x88,0x18,0x00,0x00,0x00,0x0F,0x11,0x20,0x20,0x11,0x0E,0x00,//6 220x00,0x38,0x08,0x08,0xC8,0x38,0x08,0x00,0x00,0x00,0x00,0x3F,0x00,0x00,0x00,0x00,//7 230x00,0x70,0x88,0x08,0x08,0x88,0x70,0x00,0x00,0x1C,0x22,0x21,0x21,0x22,0x1C,0x00,//8 240x00,0xE0,0x10,0x08,0x08,0x10,0xE0,0x00,0x00,0x00,0x31,0x22,0x22,0x11,0x0F,0x00,//9 250x00,0x00,0x00,0xC0,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x30,0x30,0x00,0x00,0x00,//: 260x00,0x00,0x00,0x80,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x60,0x00,0x00,0x00,0x00,//; 270x00,0x00,0x80,0x40,0x20,0x10,0x08,0x00,0x00,0x01,0x02,0x04,0x08,0x10,0x20,0x00,//< 280x40,0x40,0x40,0x40,0x40,0x40,0x40,0x00,0x04,0x04,0x04,0x04,0x04,0x04,0x04,0x00,//= 290x00,0x08,0x10,0x20,0x40,0x80,0x00,0x00,0x00,0x20,0x10,0x08,0x04,0x02,0x01,0x00,//> 300x00,0x70,0x48,0x08,0x08,0x08,0xF0,0x00,0x00,0x00,0x00,0x30,0x36,0x01,0x00,0x00,//? 310xC0,0x30,0xC8,0x28,0xE8,0x10,0xE0,0x00,0x07,0x18,0x27,0x24,0x23,0x14,0x0B,0x00,//@ 320x00,0x00,0xC0,0x38,0xE0,0x00,0x00,0x00,0x20,0x3C,0x23,0x02,0x02,0x27,0x38,0x20,//A 330x08,0xF8,0x88,0x88,0x88,0x70,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x11,0x0E,0x00,//B 340xC0,0x30,0x08,0x08,0x08,0x08,0x38,0x00,0x07,0x18,0x20,0x20,0x20,0x10,0x08,0x00,//C 350x08,0xF8,0x08,0x08,0x08,0x10,0xE0,0x00,0x20,0x3F,0x20,0x20,0x20,0x10,0x0F,0x00,//D 360x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x20,0x23,0x20,0x18,0x00,//E 370x08,0xF8,0x88,0x88,0xE8,0x08,0x10,0x00,0x20,0x3F,0x20,0x00,0x03,0x00,0x00,0x00,//F 380xC0,0x30,0x08,0x08,0x08,0x38,0x00,0x00,0x07,0x18,0x20,0x20,0x22,0x1E,0x02,0x00,//G 390x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x20,0x3F,0x21,0x01,0x01,0x21,0x3F,0x20,//H 400x00,0x08,0x08,0xF8,0x08,0x08,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//I 410x00,0x00,0x08,0x08,0xF8,0x08,0x08,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,0x00,//J 420x08,0xF8,0x88,0xC0,0x28,0x18,0x08,0x00,0x20,0x3F,0x20,0x01,0x26,0x38,0x20,0x00,//K 430x08,0xF8,0x08,0x00,0x00,0x00,0x00,0x00,0x20,0x3F,0x20,0x20,0x20,0x20,0x30,0x00,//L 440x08,0xF8,0xF8,0x00,0xF8,0xF8,0x08,0x00,0x20,0x3F,0x00,0x3F,0x00,0x3F,0x20,0x00,//M 450x08,0xF8,0x30,0xC0,0x00,0x08,0xF8,0x08,0x20,0x3F,0x20,0x00,0x07,0x18,0x3F,0x00,//N 460xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x10,0x20,0x20,0x20,0x10,0x0F,0x00,//O 470x08,0xF8,0x08,0x08,0x08,0x08,0xF0,0x00,0x20,0x3F,0x21,0x01,0x01,0x01,0x00,0x00,//P 480xE0,0x10,0x08,0x08,0x08,0x10,0xE0,0x00,0x0F,0x18,0x24,0x24,0x38,0x50,0x4F,0x00,//Q 490x08,0xF8,0x88,0x88,0x88,0x88,0x70,0x00,0x20,0x3F,0x20,0x00,0x03,0x0C,0x30,0x20,//R 500x00,0x70,0x88,0x08,0x08,0x08,0x38,0x00,0x00,0x38,0x20,0x21,0x21,0x22,0x1C,0x00,//S 510x18,0x08,0x08,0xF8,0x08,0x08,0x18,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//T 520x08,0xF8,0x08,0x00,0x00,0x08,0xF8,0x08,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//U 530x08,0x78,0x88,0x00,0x00,0xC8,0x38,0x08,0x00,0x00,0x07,0x38,0x0E,0x01,0x00,0x00,//V 540xF8,0x08,0x00,0xF8,0x00,0x08,0xF8,0x00,0x03,0x3C,0x07,0x00,0x07,0x3C,0x03,0x00,//W 550x08,0x18,0x68,0x80,0x80,0x68,0x18,0x08,0x20,0x30,0x2C,0x03,0x03,0x2C,0x30,0x20,//X 560x08,0x38,0xC8,0x00,0xC8,0x38,0x08,0x00,0x00,0x00,0x20,0x3F,0x20,0x00,0x00,0x00,//Y 570x10,0x08,0x08,0x08,0xC8,0x38,0x08,0x00,0x20,0x38,0x26,0x21,0x20,0x20,0x18,0x00,//Z 580x00,0x00,0x00,0xFE,0x02,0x02,0x02,0x00,0x00,0x00,0x00,0x7F,0x40,0x40,0x40,0x00,//[ 590x00,0x0C,0x30,0xC0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01,0x06,0x38,0xC0,0x00,//\ 600x00,0x02,0x02,0x02,0xFE,0x00,0x00,0x00,0x00,0x40,0x40,0x40,0x7F,0x00,0x00,0x00,//] 610x00,0x00,0x04,0x02,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//^ 620x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x80,0x80,0x80,0x80,0x80,0x80,0x80,0x80,//_ 630x00,0x02,0x02,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//` 640x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x19,0x24,0x22,0x22,0x22,0x3F,0x20,//a 650x08,0xF8,0x00,0x80,0x80,0x00,0x00,0x00,0x00,0x3F,0x11,0x20,0x20,0x11,0x0E,0x00,//b 660x00,0x00,0x00,0x80,0x80,0x80,0x00,0x00,0x00,0x0E,0x11,0x20,0x20,0x20,0x11,0x00,//c 670x00,0x00,0x00,0x80,0x80,0x88,0xF8,0x00,0x00,0x0E,0x11,0x20,0x20,0x10,0x3F,0x20,//d 680x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x22,0x22,0x22,0x22,0x13,0x00,//e 690x00,0x80,0x80,0xF0,0x88,0x88,0x88,0x18,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//f 700x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x6B,0x94,0x94,0x94,0x93,0x60,0x00,//g 710x08,0xF8,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//h 720x00,0x80,0x98,0x98,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//i 730x00,0x00,0x00,0x80,0x98,0x98,0x00,0x00,0x00,0xC0,0x80,0x80,0x80,0x7F,0x00,0x00,//j 740x08,0xF8,0x00,0x00,0x80,0x80,0x80,0x00,0x20,0x3F,0x24,0x02,0x2D,0x30,0x20,0x00,//k 750x00,0x08,0x08,0xF8,0x00,0x00,0x00,0x00,0x00,0x20,0x20,0x3F,0x20,0x20,0x00,0x00,//l 760x80,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x20,0x3F,0x20,0x00,0x3F,0x20,0x00,0x3F,//m 770x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x3F,0x21,0x00,0x00,0x20,0x3F,0x20,//n 780x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x00,0x1F,0x20,0x20,0x20,0x20,0x1F,0x00,//o 790x80,0x80,0x00,0x80,0x80,0x00,0x00,0x00,0x80,0xFF,0xA1,0x20,0x20,0x11,0x0E,0x00,//p 800x00,0x00,0x00,0x80,0x80,0x80,0x80,0x00,0x00,0x0E,0x11,0x20,0x20,0xA0,0xFF,0x80,//q 810x80,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x20,0x20,0x3F,0x21,0x20,0x00,0x01,0x00,//r 820x00,0x00,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x33,0x24,0x24,0x24,0x24,0x19,0x00,//s 830x00,0x80,0x80,0xE0,0x80,0x80,0x00,0x00,0x00,0x00,0x00,0x1F,0x20,0x20,0x00,0x00,//t 840x80,0x80,0x00,0x00,0x00,0x80,0x80,0x00,0x00,0x1F,0x20,0x20,0x20,0x10,0x3F,0x20,//u 850x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x00,0x01,0x0E,0x30,0x08,0x06,0x01,0x00,//v 860x80,0x80,0x00,0x80,0x00,0x80,0x80,0x80,0x0F,0x30,0x0C,0x03,0x0C,0x30,0x0F,0x00,//w 870x00,0x80,0x80,0x00,0x80,0x80,0x80,0x00,0x00,0x20,0x31,0x2E,0x0E,0x31,0x20,0x00,//x 880x80,0x80,0x80,0x00,0x00,0x80,0x80,0x80,0x80,0x81,0x8E,0x70,0x18,0x06,0x01,0x00,//y 890x00,0x80,0x80,0x80,0x80,0x80,0x80,0x00,0x00,0x21,0x30,0x2C,0x22,0x21,0x30,0x00,//z 900x00,0x00,0x00,0x00,0x80,0x7C,0x02,0x02,0x00,0x00,0x00,0x00,0x00,0x3F,0x40,0x40,//{ 910x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xFF,0x00,0x00,0x00,//| 920x00,0x02,0x02,0x7C,0x80,0x00,0x00,0x00,0x00,0x40,0x40,0x3F,0x00,0x00,0x00,0x00,//} 930x00,0x06,0x01,0x01,0x02,0x02,0x04,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,//~ 94
};/******************************************************************************
* END OF C++ DECLARATION WRAPPER
******************************************************************************/#ifdef __cplusplus
}
#endif#endif /* __FONT_H */

3 编译

3.1 编写测试程序

编写一个测试程序，主要实现初始化OLED后，清空屏显，然后写不同的字符串，详细代码如下：

/***************************************************************
Copyright  2024-2029. All rights reserved.
文件名     : test_18_oled.c
作者       : tangmingfei2013@126.com
版本       : V1.0
描述       : 验证dev_oled.c 
其他       : 无
日志       : 初版V1.0 2024/02/23***************************************************************/
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/types.h>
#include <linux/i2c-dev.h>
#include <linux/i2c.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <stdlib.h>
#include <linux/fs.h>
#include <sys/ioctl.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include <time.h>
#include "drv_oled.h"void test_oled( void )
{oled_setCharSize( FONT_16 );  oled_printfString(6,0,(unsigned char *)"0.96' OLED TEST");  oled_setCharSize( FONT_12 );oled_printfString(0,6,(unsigned char*)"ASCII:");  oled_printfString(60,6,(unsigned char*)"-CODE:");
}int main(void)
{int set;set = oled_init();if( set < 0){printf("initial oled failure.\n");return -1;}test_oled();oled_release();return 0;
}

3.2 Makefile

创建Makefile文件，将其放在驱动程序和测试程序的同级目录下，详细代码如下：

CFLAGS= -Wall -O2
CC=/home/ctools/gcc-linaro-4.9.4-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-gcc
STRIP=/home/ctools/gcc-linaro-4.9.4-arm-linux-gnueabihf/bin/arm-linux-gnueabihf-striptest_18_oled: test_18_oled.o drv_oled.o$(CC) $(CFLAGS) -o test_18_oled test_18_oled.o drv_oled.o$(STRIP) -s test_18_oledclean:rm -f test_18_oled test_18_oled.o drv_oled.o