組込みシステム開発におけるC++の実践とその機能実装

#include <iostream>
#include <unistd.h>
#include <fcntl.h>
#include <sys/mman.h>

#define GPIO_BASE_ADDR 0x10000000  // IO口基地址
#define GPIO_DATA_REG 0x00000000   // 数据寄存器地址
#define GPIO_DIR_REG  0x00000004   // 方向寄存器地址

int main() {
    int fd = open("/dev/mem", O_RDWR | O_SYNC);
    if (fd == -1) {
        std::cerr << "Failed to open /dev/mem" << std::endl;
        return -1;
    }

    void* gpio = mmap(nullptr, 0x1000, PROT_READ | PROT_WRITE, MAP_SHARED, fd, GPIO_BASE_ADDR);
    if (gpio == MAP_FAILED) {
        std::cerr << "Failed to mmap" << std::endl;
        return -1;
    }

    volatile uint32_t* gpioDataReg = (volatile uint32_t*)((char*)gpio + GPIO_DATA_REG);
    volatile uint32_t* gpioDirReg = (volatile uint32_t*)((char*)gpio + GPIO_DIR_REG);

    *gpioDirReg |= 0x01;  // 设置为输出模式

    while (true) {
        *gpioDataReg ^= 0x01;  // 翻转数据
        usleep(500000);       // 延时500ms
    }

    munmap(gpio, 0x1000);
    close(fd);

    return 0;
}

#include <iostream>
#include <thread>

void task1() {
    while (true) {
        std::cout << "Task 1" << std::endl;
        std::this_thread::sleep_for(std::chrono::seconds(1));
    }
}

void task2() {
    while (true) {
        std::cout << "Task 2" << std::endl;
        std::this_thread::sleep_for(std::chrono::seconds(2));
    }
}

int main() {
    std::thread t1(task1);
    std::thread t2(task2);

    t1.join();
    t2.join();

    return 0;
}

#include <iostream>
#include <opencv2/opencv.hpp>

int main() {
    cv::Mat image = cv::imread("image.jpg");

    if (image.empty()) {
        std::cerr << "Failed to load image" << std::endl;
        return -1;
    }

    cv::Mat grayImage;
    cv::cvtColor(image, grayImage, cv::COLOR_BGR2GRAY);

    cv::imshow("Original Image", image);
    cv::imshow("Gray Image", grayImage);

    cv::waitKey(0);

    return 0;
}