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[add] framebuffer_OpenCV demo
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dianjixz
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dist
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build
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.config.mk
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.flash.conf.json
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# framebuffer_OpenCV
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This is a replica of the CoreMP135_framebuffer_OpenCV project by nnn112358, used to demonstrate the application of OpenCV on CoreMP135.
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This project requires the use of a higher version of gcc.
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```bash
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sudo apt install arm-linux-gnueabihf-g++ arm-linux-gnueabihf-gcc
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scons
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scons push
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```
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### result in CoreMP135
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```bash
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root@M5Core135:~$ ./frame_buffer_opencv
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/dev/fb0 information
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--------------------------
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Frame Buffer Device Information:
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ID: stmdrmfb
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Memory Length: 1843200 bytes
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Type: 0
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Type Aux: 0
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Visual: 2
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Line Length: 2560 bytes per line
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--------------------------
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Variable Framebuffer Information:
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Resolution: 1280x720
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Virtual Resolution: 1280x720
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Bits Per Pixel: 16
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Red: Offset 11, Length 5
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Green: Offset 5, Length 6
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Blue: Offset 0, Length 5
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--------------------------
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/dev/fb1 information
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--------------------------
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Frame Buffer Device Information:
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ID: fb_ili9341
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Memory Length: 153600 bytes
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Type: 0
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Type Aux: 0
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Visual: 2
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Line Length: 640 bytes per line
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--------------------------
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Variable Framebuffer Information:
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Resolution: 320x240
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Virtual Resolution: 320x240
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Bits Per Pixel: 16
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Red: Offset 11, Length 5
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Green: Offset 5, Length 6
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Blue: Offset 0, Length 5
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--------------------------
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```
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### Apendix
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<img width="640" alt="S__80977923" src="https://github.com/nnn112358/CoreMP135_framebuffer_OpenCV/assets/27625496/78c63160-3e39-43e0-bf4f-8327f33d26bf">
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### Acknowledgments
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[nnn112358](https://github.com/nnn112358)
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### Reference link
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- https://github.com/nnn112358/CoreMP135_framebuffer_OpenCV.git
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- https://github.com/nihui/opencv-mobile.git
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from pathlib import Path
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import os
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with open(str(Path(os.getcwd())/'..'/'..'/'tools'/'scons'/'project.py')) as f:
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exec(f.read())
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# unix
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# CONFIG_TOOLCHAIN_PATH="/opt/gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf/bin"
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# win
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# CONFIG_TOOLCHAIN_PATH="..\\gcc-linaro-7.5.0-2019.12-x86_64_arm-linux-gnueabihf\\bin"
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CONFIG_TOOLCHAIN_PREFIX="arm-linux-gnueabihf-"
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Binary file not shown.
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After Width: | Height: | Size: 193 KiB |
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# project_root/src/SConscript
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import os
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import subprocess
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# Import the environment from the SConstruct file
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Import('env')
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with open(env['PROJECT_TOOL_S']) as f:
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exec(f.read())
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opencv_path = str(ADir('../../../github_source/opencv-mobile-2.4.13.7-armlinux'))
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if not os.path.exists(opencv_path):
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zip_file = opencv_path + '.zip'
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zip_file_extrpath = opencv_path + '_tmp'
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down_url = "https://github.com/nihui/opencv-mobile/releases/download/v26/opencv-mobile-2.4.13.7-armlinux.zip"
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if 'CONFIG_REPO_AUTOMATION' in os.environ:
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down = 'y'
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else:
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down = input('{} does not exist. Please choose whether to download it automatically? Y/N :'.format('opencv-mobile-2.4.13.7-armlinux'))
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down = down.lower()
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if down == 'y':
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# from git import Repo
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import requests
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import parse
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import zipfile
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import shutil
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try:
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# Downloading via HTTP (more common)
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if not os.path.exists(zip_file):
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response = requests.get(down_url)
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if response.status_code == 200:
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with open(zip_file, 'wb') as file:
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file.write(response.content)
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else:
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env.Fatal("{} down failed".format(down_url))
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with zipfile.ZipFile(zip_file, 'r') as zip_ref:
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zip_ref.extractall(zip_file_extrpath)
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shutil.move(os.path.join(zip_file_extrpath, 'opencv-mobile-2.4.13.7-armlinux'), opencv_path)
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shutil.rmtree(zip_file_extrpath)
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print("The {} download successful.".format(down_url))
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except Exception as e:
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print('Please manually download {} to {} .'.format(down_url, zip_file))
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env.Fatal("Cloning failed.: {}".format(e))
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else:
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env.Fatal('Please manually download {} to {} .'.format(down_url, zip_file))
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libgomp = CC_cmd_execute(['-print-file-name=libgomp.so.1'])
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SRCS = Glob('src/*.c*')
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INCLUDE = [ADir('include'), ADir('.')]
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PRIVATE_INCLUDE = []
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REQUIREMENTS = ['pthread', 'dl']
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STATIC_LIB = []
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DYNAMIC_LIB = [libgomp]
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DEFINITIONS = []
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DEFINITIONS_PRIVATE = []
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LDFLAGS = []
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LINK_SEARCH_PATH = []
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INCLUDE += [ADir('../../../github_source/opencv-mobile-2.4.13.7-armlinux/arm-linux-gnueabihf/include')]
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STATIC_LIB += Glob('../../../github_source/opencv-mobile-2.4.13.7-armlinux/arm-linux-gnueabihf/lib/*.a')
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STATIC_LIB += Glob('../../../github_source/opencv-mobile-2.4.13.7-armlinux/arm-linux-gnueabihf/lib/*.a')
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STATIC_FILES = [AFile('../img/06b.jpg')]
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env['COMPONENTS'].append({'target':env['PROJECT_NAME'],
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'SRCS':SRCS,
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'INCLUDE':INCLUDE,
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'PRIVATE_INCLUDE':PRIVATE_INCLUDE,
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'REQUIREMENTS':REQUIREMENTS,
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'STATIC_LIB':STATIC_LIB,
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'STATIC_FILES':STATIC_FILES,
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'DYNAMIC_LIB':DYNAMIC_LIB,
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'DEFINITIONS':DEFINITIONS,
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'DEFINITIONS_PRIVATE':DEFINITIONS_PRIVATE,
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'LDFLAGS':LDFLAGS,
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'LINK_SEARCH_PATH':LINK_SEARCH_PATH,
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'REGISTER':'project'
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})
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#pragma once
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#include <opencv2/opencv.hpp>
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#include <iostream>
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#include <fstream>
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#include <fcntl.h>
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#include <linux/fb.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <stdexcept>
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#include <chrono>
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int view_information(struct fb_fix_screeninfo &finfo ,struct fb_var_screeninfo &vinfo){
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// デバイス情報の出力
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std::cout << "--------------------------\n"
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<< "Frame Buffer Device Information:\n"
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<< "ID: " << finfo.id << "\n"
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<< "Memory Length: " << finfo.smem_len << " bytes\n"
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<< "Type: " << finfo.type << "\n"
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<< "Type Aux: " << finfo.type_aux << "\n"
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<< "Visual: " << finfo.visual << "\n"
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<< "Line Length: " << finfo.line_length << " bytes per line\n"
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<< "--------------------------\n";
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// スクリーン情報の出力
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std::cout << "Variable Framebuffer Information:\n"
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<< "Resolution: " << vinfo.xres << "x" << vinfo.yres << "\n"
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<< "Virtual Resolution: " << vinfo.xres_virtual << "x" << vinfo.yres_virtual << "\n"
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<< "Bits Per Pixel: " << static_cast<int>(vinfo.bits_per_pixel) << "\n"
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<< "Red: Offset " << static_cast<int>(vinfo.red.offset) << ", Length " << static_cast<int>(vinfo.red.length) << "\n"
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<< "Green: Offset " << static_cast<int>(vinfo.green.offset) << ", Length " << static_cast<int>(vinfo.green.length) << "\n"
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<< "Blue: Offset " << static_cast<int>(vinfo.blue.offset) << ", Length " << static_cast<int>(vinfo.blue.length) << "\n"
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<< "--------------------------\n";
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return 0;
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}
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int main() {
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// フレームバッファデバイスのファイルディスクリプタ
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int fbfd0 = open("/dev/fb0", O_RDWR);
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if (fbfd0 == -1) {
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perror("Cannot open framebuffer device");
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return 1;
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}
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int fbfd1 = open("/dev/fb1", O_RDWR);
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if (fbfd1 == -1) {
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perror("Cannot open framebuffer device");
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return 1;
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}
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// 固定スクリーン情報の構造体
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struct fb_fix_screeninfo finfo0;
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if (ioctl(fbfd0, FBIOGET_FSCREENINFO, &finfo0)) {
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perror("Error reading fixed screen info");
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close(fbfd0);
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return 1;
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}
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// 固定スクリーン情報の構造体
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struct fb_fix_screeninfo finfo1;
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if (ioctl(fbfd1, FBIOGET_FSCREENINFO, &finfo1)) {
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perror("Error reading fixed screen info");
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close(fbfd1);
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return 1;
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}
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// 可変スクリーン情報の構造体
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struct fb_var_screeninfo vinfo0;
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if (ioctl(fbfd0, FBIOGET_VSCREENINFO, &vinfo0)) {
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perror("Error reading variable screen info");
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close(fbfd0);
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return 1;
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}
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// 可変スクリーン情報の構造体
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struct fb_var_screeninfo vinfo1;
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if (ioctl(fbfd1, FBIOGET_VSCREENINFO, &vinfo1)) {
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perror("Error reading variable screen info");
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close(fbfd1);
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return 1;
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}
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std::cout<<"/dev/fb0 information"<<std::endl;
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view_information(finfo0 ,vinfo0);
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std::cout<<"/dev/fb1 information"<<std::endl;
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view_information(finfo1 ,vinfo1);
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// メモリマッピング
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char* fbAddr0 = static_cast<char*>(mmap(nullptr, finfo0.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd0, 0));
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if (fbAddr0 == MAP_FAILED) {
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perror("Failed to mmap");
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close(fbfd0);
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return 1;
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}
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char* fbAddr1 = static_cast<char*>(mmap(nullptr, finfo1.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd1, 0));
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if (fbAddr1 == MAP_FAILED) {
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perror("Failed to mmap");
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close(fbfd0);
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return 1;
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}
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// 画像の読み込み
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cv::Mat image = cv::imread("06b.jpg");
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if (image.empty()) {
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std::cerr << "Error: Image not found or empty.\n";
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munmap(fbAddr0, finfo0.smem_len);
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munmap(fbAddr1, finfo1.smem_len);
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close(fbfd0);
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close(fbfd1);
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return 1;
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}
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// 画像のリサイズとカラーフォーマット変換
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cv::Mat displayport_image;
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cv::Mat lcd_image;
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cv::resize(image, displayport_image, cv::Size(vinfo0.xres, vinfo0.yres));
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cv::resize(image, lcd_image, cv::Size(vinfo1.xres, vinfo1.yres));
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// DisplayPort(HDMI):BGR888(24bit Color)⇒BGR565(16bit Color)
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cv::cvtColor(displayport_image, displayport_image, cv::COLOR_BGR2BGR565);
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//LCD:BGR888(24bit Color)⇒BGR565(16bit Color)
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cv::cvtColor(lcd_image, lcd_image, cv::COLOR_BGR2BGR565);
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// フレームバッファへの書き込み
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size_t screen_size0 = displayport_image.total() * displayport_image.elemSize();
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memcpy(fbAddr0, displayport_image.data, screen_size0);
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size_t screen_size1 = lcd_image.total() * lcd_image.elemSize();
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memcpy(fbAddr1, lcd_image.data, screen_size1);
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// リソースの解放
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munmap(fbAddr0, finfo0.smem_len);
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munmap(fbAddr1, finfo1.smem_len);
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close(fbfd0);
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close(fbfd1);
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return 0;
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}
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