Template:LIBGPIOD V2 C EXAMPLE

libgpiod C++ Application

[ libgpiod] provides bindings for C++, Python and Rust applications. C++ examples are available in the libgpiod [/tree/bindings/cxx/examples /tree/bindings/cxx/examples ] directory.

Below is a simple C application demonstrating how to use the bindings with GPIO0_IO05:

Makefile:

LDFLAGS = -lgpiodcxx -lgpiod

# Nome do executável e arquivos fonte
TARGET = main
SRCS = main.cpp

all: $(TARGET)

$(TARGET): $(SRCS)
	$(CXX) $(SRCS) $(LDFLAGS) -o $(TARGET)

clean:
	rm -f $(TARGET)

main.cpp

// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>

/* Minimal example of reading a single line. */

#include <cstdlib>
#include <filesystem>
#include <gpiod.hpp>
#include <iostream>

namespace {

/* Example configuration - customize to suit your situation */
const ::std::filesystem::path chip_path("/dev/gpiochip0");
const ::gpiod::line::offset line_offset = 5;

} /* namespace */

int main()
{
	auto request = ::gpiod::chip(chip_path)
			       .prepare_request()
			       .set_consumer("get-line-value")
			       .add_line_settings(
				       line_offset,
				       ::gpiod::line_settings().set_direction(
					       ::gpiod::line::direction::INPUT))
			       .do_request();

	::std::cout << line_offset << "="
		    << (request.get_value(line_offset) ==
					::gpiod::line::value::ACTIVE ?
				"Active" :
				"Inactive")
		    << ::std::endl;

	return EXIT_SUCCESS;
}