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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>
50 lines
1.3 KiB
C++
50 lines
1.3 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 watching for requests on particular lines. */
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#include <cstdlib>
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#include <gpiod.hpp>
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#include <iomanip>
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#include <iostream>
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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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const char *event_type(const ::gpiod::info_event &event)
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{
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switch (event.type()) {
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case ::gpiod::info_event::event_type::LINE_REQUESTED:
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return "Requested";
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case ::gpiod::info_event::event_type::LINE_RELEASED:
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return "Released";
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case ::gpiod::info_event::event_type::LINE_CONFIG_CHANGED:
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return "Reconfig";
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default:
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return "Unknown";
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}
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}
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} /* namespace */
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int main()
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{
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::gpiod::chip chip(chip_path);
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for (auto offset :line_offsets)
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chip.watch_line_info(offset);
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for (;;) {
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/* Blocks until at least one event is available */
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auto event = chip.read_info_event();
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::std::cout << "line: " << event.get_line_info().offset() << " "
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<< ::std::setw(9) << ::std::left
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<< event_type(event) << " "
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<< event.timestamp_ns() / 1000000000 << "."
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<< event.timestamp_ns() % 1000000000 << ::std::endl;
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}
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}
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