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https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git
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0c753417de
Fix typo in comment in watch_multiple_line_values.cpp. Signed-off-by: Kent Gibson <warthog618@gmail.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
61 lines
1.5 KiB
C++
61 lines
1.5 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 edges on multiple 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 *edge_event_type_str(const ::gpiod::edge_event &event)
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{
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switch (event.type()) {
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case ::gpiod::edge_event::event_type::RISING_EDGE:
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return "Rising";
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case ::gpiod::edge_event::event_type::FALLING_EDGE:
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return "Falling";
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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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auto request =
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::gpiod::chip(chip_path)
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.prepare_request()
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.set_consumer("watch-multiple-line-values")
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.add_line_settings(
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line_offsets,
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::gpiod::line_settings()
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.set_direction(
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::gpiod::line::direction::INPUT)
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.set_edge_detection(
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::gpiod::line::edge::BOTH))
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.do_request();
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::gpiod::edge_event_buffer buffer;
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for (;;) {
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/* Blocks until at least one event available */
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request.read_edge_events(buffer);
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for (const auto &event : buffer)
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::std::cout << "offset: " << event.line_offset()
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<< " type: " << ::std::setw(7)
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<< ::std::left << edge_event_type_str(event)
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<< " event #" << event.global_seqno()
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<< " line event #" << event.line_seqno()
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<< ::std::endl;
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}
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}
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