84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Copyright Drew Noakes 2013-2016
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#include "joystick.hh"
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <iostream>
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#include <string>
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#include <sstream>
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#include "unistd.h"
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Joystick::Joystick()
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{
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openPath("/dev/input/js0");
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}
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Joystick::Joystick(int joystickNumber)
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{
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std::stringstream sstm;
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sstm << "/dev/input/js" << joystickNumber;
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openPath(sstm.str());
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}
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Joystick::Joystick(std::string devicePath)
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{
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openPath(devicePath);
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}
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Joystick::Joystick(std::string devicePath, bool blocking)
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{
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openPath(devicePath, blocking);
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}
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void Joystick::openPath(std::string devicePath, bool blocking)
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{
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// Open the device using either blocking or non-blocking
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_fd = open(devicePath.c_str(), blocking ? O_RDONLY : O_RDONLY | O_NONBLOCK);
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}
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bool Joystick::sample(JoystickEvent* event)
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{
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int bytes = read(_fd, event, sizeof(*event));
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if (bytes == -1)
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return false;
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// NOTE if this condition is not met, we're probably out of sync and this
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// Joystick instance is likely unusable
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return bytes == sizeof(*event);
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}
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bool Joystick::isFound()
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{
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return _fd >= 0;
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}
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Joystick::~Joystick()
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{
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close(_fd);
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}
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std::ostream& operator<<(std::ostream& os, const JoystickEvent& e)
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{
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os << "type=" << static_cast<int>(e.type)
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<< " number=" << static_cast<int>(e.number)
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<< " value=" << static_cast<int>(e.value);
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return os;
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}
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