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