歼20航模遥控器开源项目计划（基于STM32） | 先做一个开机界面 | MATLAB图像二值化 | Img2Lcd图片取模

衣带渐宽终不悔，为伊消得人憔悴。

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

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！

为什么要命名为歼20遥控器？

其一，我们自己DIY的遥控器，当然要用我国之重器-歼20来命名！相信如果当年LUOLI大佬开发遥控器时，我们祖国的歼20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，歼20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~

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歼20开机界面！

（1）修改图片尺寸

找一张歼20图片，我用了上面的图片，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,3];%设置空白图片矩阵
f=uint8 (round (fd*255)); %转换为RGB值
bg=255;%灰色背景51
for i=1:1:m
   for j=1:1:n
       if (e(i,j)<=200)
           f(i,j,1)=91;
           f(i,j,2)=155;
           f(i,j,3)=213;
       else
           f(i,j,1)=255;
           f(i,j,2)=255;
           f(i,j,3)=255;
       end
   end
end
% figure;
% imshow(f);
% sa=imcrop(f,[0,0,140,140]);%裁剪[左上角起始位置x,y,裁剪宽,高]
% imwrite(f,'j20.png');

生成的j20.bmp图片效果（下图是高清图，12864的要模糊很多），有一些不满意的地方，接下来我们拿PS来修一下。

下图是128*64的图片，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

unsigned char J20[] =
{
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};
unsigned char J20fly[]=
{
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};

（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，先做一个歼20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 J20[];
extern unsigned char J20fly[];
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(115200);//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 (1){
//		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(0,0,110,8,J20);
		OLED_DrawBMP(0,0,128,8,J20fly);
//		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(500);
	}
}

完整的工程文件已上传天翼云盘：

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

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