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https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
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753c33142f
While () and (void) are synonymous in C++, we use () everywhere else so stick to that pattern in examples. Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
// SPDX-License-Identifier: GPL-2.0-or-later
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// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
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/* Minimal example of toggling multiple lines. */
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#include <cstdlib>
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#include <gpiod.hpp>
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#include <iostream>
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#include <thread>
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namespace {
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/* Example configuration - customize to suit your situation */
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const ::std::filesystem::path chip_path("/dev/gpiochip0");
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const ::gpiod::line::offsets line_offsets = { 5, 3, 7 };
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::gpiod::line::value toggle_value(::gpiod::line::value v)
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{
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return (v == ::gpiod::line::value::ACTIVE) ?
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::gpiod::line::value::INACTIVE :
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::gpiod::line::value::ACTIVE;
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}
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void toggle_values(::gpiod::line::values &values)
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{
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for (size_t i = 0; i < values.size(); i++)
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values[i] = toggle_value(values[i]);
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}
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void print_values(::gpiod::line::offsets const &offsets,
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::gpiod::line::values const &values)
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{
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for (size_t i = 0; i < offsets.size(); i++)
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::std::cout << offsets[i] << "=" << values[i] << ' ';
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::std::cout << ::std::endl;
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}
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} /* namespace */
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int main()
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{
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::gpiod::line::values values = { ::gpiod::line::value::ACTIVE,
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::gpiod::line::value::ACTIVE,
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::gpiod::line::value::INACTIVE };
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auto request =
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::gpiod::chip(chip_path)
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.prepare_request()
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.set_consumer("toggle-multiple-line-values")
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.add_line_settings(
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line_offsets,
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::gpiod::line_settings().set_direction(
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::gpiod::line::direction::OUTPUT))
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.set_output_values(values)
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.do_request();
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for (;;) {
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print_values(line_offsets, values);
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std::this_thread::sleep_for(std::chrono::seconds(1));
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toggle_values(values);
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request.set_values(line_offsets, values);
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}
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}
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