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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
/* Minimal example of toggling a single line. */
#include <cstdlib>
#include <chrono>
#include <filesystem>
#include <gpiod.hpp>
#include <iostream>
#include <thread>
namespace {
/* Example configuration - customize to suit your situation. */
const ::std::filesystem::path chip_path("/dev/gpiochip0");
const ::gpiod::line::offset line_offset = 5;
::gpiod::line::value toggle_value(::gpiod::line::value v)
{
return (v == ::gpiod::line::value::ACTIVE) ?
::gpiod::line::value::INACTIVE :
::gpiod::line::value::ACTIVE;
}
} /* namespace */
int main()
{
::gpiod::line::value value = ::gpiod::line::value::ACTIVE;
auto request =
::gpiod::chip(chip_path)
.prepare_request()
.set_consumer("toggle-line-value")
.add_line_settings(
line_offset,
::gpiod::line_settings().set_direction(
::gpiod::line::direction::OUTPUT))
.do_request();
for (;;) {
::std::cout << line_offset << "=" << value << ::std::endl;
std::this_thread::sleep_for(std::chrono::seconds(1));
value = toggle_value(value);
request.set_value(line_offset, value);
}
}
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