初始提交：龙芯2K0300智能车卖家Demo完整代码

src/GPIO.cpp

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+/*
+ * @Author: ilikara 3435193369@qq.com
+ * @Date: 2024-10-10 15:02:10
+ * @LastEditors: ilikara 3435193369@qq.com
+ * @LastEditTime: 2024-12-01 03:50:49
+ * @FilePath: /smartcar/src/GPIO.cpp
+ * @Description: 
+ * 
+ * Copyright (c) 2024 by ${git_name_email}, All Rights Reserved. 
+ */
+#include "GPIO.h"
+
+GPIO::GPIO(int gpioNum) : gpioNum(gpioNum), fd(-1)
+{
+    gpioPath = "/sys/class/gpio/gpio" + std::to_string(gpioNum);
+
+    writeToFile("/sys/class/gpio/export", std::to_string(gpioNum));
+
+    fd = open((gpioPath + "/value").c_str(), O_RDWR);
+    if (fd == -1)
+    {
+        throw std::runtime_error("Failed to open GPIO value file: " + std::string(strerror(errno)));
+    }
+}
+
+GPIO::~GPIO()
+{
+    if (fd != -1)
+    {
+        close(fd); // 关闭文件描述符
+    }
+}
+
+bool GPIO::setDirection(const std::string &direction)
+{
+    return writeToFile(gpioPath + "/direction", direction);
+}
+
+bool GPIO::setEdge(const std::string &edge)
+{
+    return writeToFile(gpioPath + "/edge", edge);
+}
+
+bool GPIO::setValue(bool value)
+{
+    if (fd == -1)
+    {
+        std::cerr << "GPIO file descriptor is invalid" << std::endl;
+        return false;
+    }
+
+    // 使用文件描述符写入 GPIO 值 ('1' 或 '0')
+    const char *val_str = value ? "1" : "0";
+    if (write(fd, val_str, 1) != 1)
+    {
+        std::cerr << "Failed to write GPIO value: " << strerror(errno) << std::endl;
+        return false;
+    }
+    return true;
+}
+
+bool GPIO::readValue()
+{
+    if (fd == -1)
+    {
+        std::cerr << "GPIO file descriptor is invalid" << std::endl;
+        return false;
+    }
+
+    char value;
+    lseek(fd, 0, SEEK_SET); // 重置文件偏移量
+    if (read(fd, &value, 1) != 1)
+    {
+        std::cerr << "Failed to read GPIO value: " << strerror(errno) << std::endl;
+        return false;
+    }
+    return value == '1'; // 如果读取的值为 '1'，则返回 true，否则返回 false
+}
+
+int GPIO::getFileDescriptor() const
+{
+    return fd;
+}
+
+bool GPIO::writeToFile(const std::string &path, const std::string &value)
+{
+    int fd = ::open(path.c_str(), O_WRONLY);
+    if (fd == -1)
+    {
+        return false;
+    }
+    ssize_t n = ::write(fd, value.c_str(), value.size());
+    ::close(fd);
+    return (n == static_cast<ssize_t>(value.size()));
+}