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// SPDX-License-Identifier: GPL-2.0-or-later
// SPDX-FileCopyrightText: 2023 Kent Gibson <warthog618@gmail.com>
/* Minimal example of toggling multiple lines. */
#include <cstdlib>
#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::offsets line_offsets = { 5, 3, 7 };
::gpiod::line::value toggle_value(::gpiod::line::value v)
{
return (v == ::gpiod::line::value::ACTIVE) ?
::gpiod::line::value::INACTIVE :
::gpiod::line::value::ACTIVE;
}
void toggle_values(::gpiod::line::values &values)
{
for (size_t i = 0; i < values.size(); i++)
values[i] = toggle_value(values[i]);
}
void print_values(::gpiod::line::offsets const &offsets,
::gpiod::line::values const &values)
{
for (size_t i = 0; i < offsets.size(); i++)
::std::cout << offsets[i] << "=" << values[i] << ' ';
::std::cout << ::std::endl;
}
} /* namespace */
int main()
{
::gpiod::line::values values = { ::gpiod::line::value::ACTIVE,
::gpiod::line::value::ACTIVE,
::gpiod::line::value::INACTIVE };
auto request =
::gpiod::chip(chip_path)
.prepare_request()
.set_consumer("toggle-multiple-line-values")
.add_line_settings(
line_offsets,
::gpiod::line_settings().set_direction(
::gpiod::line::direction::OUTPUT))
.set_output_values(values)
.do_request();
for (;;) {
print_values(line_offsets, values);
std::this_thread::sleep_for(std::chrono::seconds(1));
toggle_values(values);
request.set_values(line_offsets, values);
}
}
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