Ries Twisk
HID Joystick - For use with X-Plane or other programs that can read HID JoySticks
Dependencies: USBDevice mbed-rtos mbed
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JoyStick
by 
Ries Twisk
This is a simple Joystick HID that I use for xplane and a home build yoke + paddels, see this forum with the look and feel of it : http://forums.x-plane.org/index.php?showtopic=70041
The analog input are filtered with a LowPass IIR filter and the digital input's will be derived from the analog input and de-bounced.
The analog values are read at a 1Khz interval and to ensure we don't push the USB stack to much at a maximum rate of 20 updates/sec HID data is send over USB only if any values where changed. The JoyStick will send 16Bit analog values as opposite of 8 bit values that are normally used to increase accuracy of the whole system. This is well noticeable within x-plane!
The JoyStick uses the JoyStick copied from Wim Huiskamp and modified to suite my needs and the MBED RTOS libraries for reading analog inputs, sending debug data over USB and sending HID data, 3 threads in total.
USBJoystick.cpp
- Committer:
- rvt
- Date:
- 2013-08-28
- Revision:
- 0:33bc88c4ab31
- Child:
- 2:ae7a31a3c618
File content as of revision 0:33bc88c4ab31:
/* Copyright (c) 2010-2011 mbed.org, MIT License
* Modified Mouse code for Joystick - WH 2012
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of this software
* and associated documentation files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or
* substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
* BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "stdint.h"
#include "USBJoystick.h"
bool USBJoystick::update(int16_t t, int16_t r, int16_t x, int16_t y, uint8_t button, uint8_t hat) {
HID_REPORT report;
_t = t;
_r = r;
_x = x;
_y = y;
_button = button;
_hat = hat;
// Fill the report according to the Joystick Descriptor
report.data[0] = _t & 0xff;
report.data[1] = (_t >> 8) & 0xff;
report.data[2] = _r & 0xff;
report.data[3] = (_r >> 8) & 0xff;
report.data[4] = _x & 0xff;
report.data[5] = (_x >> 8) & 0xff;
report.data[6] = _y & 0xff;
report.data[7] = (_y >> 8) & 0xff;
report.data[8] = ((_button & 0x0f) << 4) | (_hat & 0x0f) ;
report.length = 9;
return send(&report);
}
bool USBJoystick::update() {
HID_REPORT report;
// Fill the report according to the Joystick Descriptor
report.data[0] = _t & 0xff;
report.data[1] = (_t >> 8) & 0xff;
report.data[2] = _r & 0xff;
report.data[3] = (_r >> 8) & 0xff;
report.data[4] = _x & 0xff;
report.data[5] = (_x >> 8) & 0xff;
report.data[6] = _y & 0xff;
report.data[7] = (_y >> 8) & 0xff;
report.data[8] = ((_button & 0x0f) << 4) | (_hat & 0x0f) ;
report.length = 9;
return send(&report);
}
bool USBJoystick::throttle(int16_t t) {
_t = t;
return update();
}
bool USBJoystick::rudder(int16_t r) {
_r = r;
return update();
}
bool USBJoystick::move(int16_t x, int16_t y) {
_x = x;
_y = y;
return update();
}
bool USBJoystick::button(uint8_t button) {
_button = button;
return update();
}
bool USBJoystick::hat(uint8_t hat) {
_hat = hat;
return update();
}
void USBJoystick::_init() {
_t = 0;
_r = 0;
_x = 0;
_y = 0;
_button = 0x00;
_hat = 0x00;
}
uint8_t * USBJoystick::reportDesc() {
static uint8_t reportDescriptor[] = {
USAGE_PAGE(1), 0x01, // Generic Desktop
LOGICAL_MINIMUM(1), 0x00, // Logical_Minimum (0)
USAGE(1), 0x04, // Usage (Joystick)
COLLECTION(1), 0x01, // Application
USAGE_PAGE(1), 0x02, // Simulation Controls
USAGE(1), 0xBB, // Throttle
USAGE(1), 0xBA, // Rudder
LOGICAL_MINIMUM(2), 0x01, 0x80, // -32767
LOGICAL_MAXIMUM(2), 0xff, 0x7f, // 32767
REPORT_SIZE(1), 0x10,
REPORT_COUNT(1), 0x02,
INPUT(1), 0x02, // Data, Variable, Absolute
USAGE_PAGE(1), 0x01, // Generic Desktop
USAGE(1), 0x01, // Usage (Pointer)
COLLECTION(1), 0x00, // Physical
USAGE(1), 0x30, // X
USAGE(1), 0x31, // Y
// 8 bit values
// LOGICAL_MINIMUM(1), 0x81, // -127
// LOGICAL_MAXIMUM(1), 0x7f, // 127
// REPORT_SIZE(1), 0x08,
// REPORT_COUNT(1), 0x02,
// INPUT(1), 0x02, // Data, Variable, Absolute
// 16 bit values
LOGICAL_MINIMUM(2), 0x01, 0x80, // -32767
LOGICAL_MAXIMUM(2), 0xff, 0x7f, // 32767
REPORT_SIZE(1), 0x10,
REPORT_COUNT(1), 0x02,
INPUT(1), 0x02, // Data, Variable, Absolute
END_COLLECTION(0),
// 4 Position Hat Switch
// USAGE(1), 0x39, // Usage (Hat switch)
// LOGICAL_MINIMUM(1), 0x00, // 0
// LOGICAL_MAXIMUM(1), 0x03, // 3
// PHYSICAL_MINIMUM(1), 0x00, // Physical_Minimum (0)
// PHYSICAL_MAXIMUM(2), 0x0E, 0x01, // Physical_Maximum (270)
// UNIT(1), 0x14, // Unit (Eng Rot:Angular Pos)
// REPORT_SIZE(1), 0x04,
// REPORT_COUNT(1), 0x01,
// INPUT(1), 0x02, // Data, Variable, Absolute
// 8 Position Hat Switch
USAGE(1), 0x39, // Usage (Hat switch)
LOGICAL_MINIMUM(1), 0x00, // 0
LOGICAL_MAXIMUM(1), 0x07, // 7
PHYSICAL_MINIMUM(1), 0x00, // Physical_Minimum (0)
PHYSICAL_MAXIMUM(2), 0x3B, 0x01, // Physical_Maximum (315)
UNIT(1), 0x14, // Unit (Eng Rot:Angular Pos)
REPORT_SIZE(1), 0x04,
REPORT_COUNT(1), 0x01,
INPUT(1), 0x02, // Data, Variable, Absolute
//
USAGE_PAGE(1), 0x09, // Buttons
USAGE_MINIMUM(1), 0x01, // 1
USAGE_MAXIMUM(1), 0x04, // 4
LOGICAL_MINIMUM(1), 0x00, // 0
LOGICAL_MAXIMUM(1), 0x01, // 1
REPORT_SIZE(1), 0x01,
REPORT_COUNT(1), 0x04,
UNIT_EXPONENT(1), 0x00, // Unit_Exponent (0)
UNIT(1), 0x00, // Unit (None)
INPUT(1), 0x02, // Data, Variable, Absolute
END_COLLECTION(0)
};
reportLength = sizeof(reportDescriptor);
return reportDescriptor;
}