致敬学长！J20航模遥控器开源项目计划【开局篇】 | 先做一个开机界面 | MATLAB图像二值化 | Img2Lcd图片取模 | OLED显示图片

我们的开源宗旨：自由 协调 开放 合作 共享

拥抱开源，丰富国内开源生态，开展多人运动，欢迎加入我们哈~

和一群志同道合的人，做自己所热爱的事！

项目开源地址：https://github.com/Cai-Zi/STM32_RC_Transmitter

Bilibili账号：蔡子CaiZi

个人主页：https://space.bilibili.com/349576976

1.为什么要用STM32做航模遥控器？Arduino不香嘛？

之前用Arduino Pro Mini制作了一个航模遥控器+接收机，不得不说Arduino开发起来非常方便，但是博主用的开发板比较廉价，芯片资源较少，只能实现基础功能，遥控性能也不能令人满意。我们的经费又不够来买大几百的UNO，怎么办？我找到了同价位的STM32F103C8T6开发板，十元包邮解君愁！这个小板子于我们遥控器而言，资源足够用了，别人甚至拿它来玩平衡车、四旋翼、智能家居，足见其强大！

2.为什么要命名为J20遥控器？

其一，我们自己DIY的遥控器，当然要用我国之重器-J20来命名！相信如果当年LUOLI大佬开发遥控器时，我们祖国的J20面世了，他也会用J20来命名自己的遥控器，而不是SU27，每个人都有自己的民族自豪感，我也一样！

其二，J20的总设计师-杨伟院士，是我的学长！招生宣传一波哈哈哈哈哈哈，欢迎报考西北工业大学！（招生办是不是该打钱了）我们学校真是太低调了，当年报考前我压根没听说过西工大，宣传力度要加强啊。

其三，今年是2020年，就说应景不应景！J20中的数字也象征着我们的开发时间，独特的年份，用来命名我们的遥控器刚刚好~

3.为什么要记录开发制作过程？

博主也是边学边做，并且是利用业余时间（导师：论文看累了，就敲点代码放松一下），实际上很耗费时间和精力啊！把学习过程记录下来，一是方便加深自己的理解，二是希望能帮到别人叭，三是提供给DIY玩家自己改造的空间，一千个人心中有一千个哈姆雷特，每个人都有自己的想法，授人以鱼不如授人以渔，教程可以帮助读者完成自己的个性化设计，比如设计开机界面、添加修改功能。

项目完全开源，还附带教程，怎么样？上车吧！

---

开始正文

1. 项目计划

前天，北斗三号最后一颗全球组网卫星发射成功，实现全球组网。不得不说我们祖国越来越强大了，我们自己也要更努力才行啊，现在我们总被漂亮国卡脖子，但是莫欺少年穷！我们每个人都为祖国建设添砖加瓦，迟早祖国会实现伟大复兴！

北斗系统建设采用“三步走”战略-【从无到有-服务亚太-全球组网】，那么我们的遥控器也分三步走，先完成基础版，实现遥控器的基础功能，再进行升级，添加屏幕界面交互，最后添加更高级人性化的功能。先会爬 再会走路 最后学会奔跑，这样看，万物是不是都相通的？

2. 开机界面制作

侃了这么多，来开工吧，万事开头难，我们先做一个帅气的J20开机界面！

（1）修改图片尺寸

找一张J20图片，用2345看图王修改图片尺寸128像素*64像素（或者比这个范围小一点），因为我们的OLED显示屏只有128*64个像素点，这一步也可以和第二步一起用程序实现。

（2）图像二值化

所谓图像二值化，就是将彩色图片变成黑白的，我们的显示屏单个像素只有亮/暗两种状态，对应1/0二值。可以用MATLAB/Python/Photoshop等来处理成黑白的，这里我用的是MATLAB，图片和m文件放在同一文件夹，代码如下：

 close all
 clear all
 clc
 %%
 A=imread('j20.jpg');% 输入图片
 n = graythresh(A);
 % D=imbinarize(A,n);
 D=im2bw(A,n);
 % figure;
 % imshow(D);
 imwrite(D,'j20.bmp');% 输出图片
 e=imread('j20.bmp');
 [m,n] = size(e);
 img = zeros(m,n);
 fd=[m,n,];%设置空白图片矩阵
 f=uint8 (round (fd*)); %转换为RGB值
 bg=;%灰色背景51
 for i=::m
    for j=::n
        if (e(i,j)<=)
            f(i,j,)=;
            f(i,j,)=;
            f(i,j,)=;
        else
            f(i,j,)=;
            f(i,j,)=;
            f(i,j,)=;
        end
    end
 end
 % figure;
 % imshow(f);
 % sa=imcrop(f,[,,,]);%裁剪[左上角起始位置x,y,裁剪宽,高]
 % imwrite(f,'j20.png');

生成j20.bmp后，有一些不满意的地方，接下来我们拿PS来修一下。

花费一点时间， 把边边角角清理干净，把线条补充上，再加个J-20文字，最后保存成bmp文件。

（3）Img2Lcd图片转数组

打开刚才修好的bmp图片，按如下四步操作，保存数组。如果发现显示不对，可以尝试改变图中设置，如果你不想搞懂OLED显示原理，那么一个一个试就可以了。扫描模式（4种选项）和6个选项栏（勾选/不勾选），最多4*2^6=256次，我比较幸运，只试了10次。

奉上我做好的两个数组，建议给我们的UI设计师加鸡腿！最后一张太好看了叭！

 unsigned char J20logo[] =
 {
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 };
 
 unsigned char J20logoR[]=
 {
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 };

图片取模数组代码

（4）图片显示程序

首先声明数组是全局变量，再在循环中调用显示函数。

 /*
 =============菜单显示==============
     芯片STM32F103C8T6，先做一个J20开机界面
     OLED显示屏：
                 GND   电源地
                 VCC   接3.3v电源
                 SCL   接PB8（SCL）
                 SDA   接PB9（SDA）
     串口USB-TTL接法：
                 GND   电源地
                 3V3   接3.3v
                 TXD   接PB7
                 RXD   接PB6
     ST-LINK V2接法：
                 GND   电源地
                 3V3   接3.3v
                 SWCLK 接DCLK
                 SWDIO 接DIO
     by Bilibili 蔡子CaiZi
 */
 #include "config.h"
 #include "delay.h"
 #include "usart.h"
 #include "stm32f10x.h"
 #include "oled.h"
 #include "rtc.h"
 #include "stdio.h"
 #include "string.h"
 extern unsigned char J20logo[];
 extern unsigned char J20logoR[];
 extern unsigned char BMP1[];
 int main()
 {
 //    u8 txt[16]={0};
     delay_init();//初始化延时函数
     NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); //设置NVIC中断分组2，2位抢占优先级和2位子优先级
     usart_init();//初始化串口1，波特率为115200
 //    TIM3_PWM_Init(19999,71);//预分频72，频率1MHz，周期1us；自动装载值20 000，故PWM周期1us*20 000
 //    TIM2_Init(499,71);//1MHz，每500us采集一次；可设置9us以上，但过小影响OLED显示
 //    DMA1_Init();    //DMA初始化
 //    GPIOA_Init();    //PA初始化
 //    Adc_Init();        //ADC初始化
 //    RTC_Init();          //RTC初始化
     OLED_Init();    //初始化OLED
     OLED_Clear();
     OLED_Refresh_Gram();
     while (){
 //        itoa(PWM1value,txt,10);//将int类型转换成10进制字符串
 //        printf("采样值：%d\t舵量：%s\t",ch1Value,txt);
 //        printf("当前时间：%d:%d:%d\n",calendar.hour,calendar.min,calendar.sec);
 //        //OLED_Clear();//一直清屏会造成闪烁
 //        strcat(txt," us");//合并字符串
 //        OLED_ShowString(6,3,txt,24); //位置6,3；字符大小24*24点阵
         OLED_DrawBMP(,,,,J20logo);
 //        OLED_DrawBMP(0,0,128,8,BMP1);
         //OLED_ShowString(6,3,"CaiZi",24); //位置6,3；字符大小24*24点阵
         //OLED_Refresh_Gram();
         delay_ms();
     }
 }

完整的工程文件已上传天翼云盘：

https://cloud.189.cn/t/rYZzQ3yIbIrm（访问码：5eju）

项目宣传视频

https://www.bilibili.com/video/BV1Vg4y1v7oQ

写在最后：

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开源团队现有成员：（持续更新）

蔡子CaiZi（B站up主）    - STM32开发
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小何（模友）                   - PCB设计
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简繁（模友）                   - UI设计
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与非门（模友）               - STM32开发
Talons（模友）               - STM32开发
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P a S S ||（模友）          - STM32开发