Changes

The wheel hardware contains the nRF24L01, a ATMEGA micro, and a PWM/Full-bridge driver for controlling the motor. The micro scans the [[:File:Logitech_usb_buttons.pdf|buttons]] mounted on the wheel, digitises the wheel/accelerator/brake positions and sends the data to the PC/Dongle.

The wheel hardware contains the nRF24L01, a ATMEGA micro, and a PWM/Full-bridge driver for controlling the motor. The micro scans the [[:File:Logitech_usb_buttons.pdf|buttons]] mounted on the wheel, digitises the wheel/accelerator/brake positions and sends the data to the PC/Dongle.

==Protocol==

===USB HID Joystick===

The dongle is a standard USB HID device. The feature port is used to configure the dongle/wireless link, the in-port reads data from the wheel and the out-port is used to send Force Feedback commands.

The dongle is a standard USB HID device. The feature port is used to configure the dongle/wireless link, the in-port reads data from the wheel and the out-port is used to send Force Feedback commands.

The dongle has the USB ID 0x046D:0xC29C, the HID descriptor is (unfortunately) corrupt.  

The dongle has the USB ID 0x046D:0xC29C, the HID descriptor is (unfortunately) corrupt.  

There are a number of force feed back codes which can be written to the USB out-port, some of these are know/understood but assistance is required to further reverse engineer the rest.

There are a number of force feed back codes which can be written to the USB out-port, some of these are know/understood but assistance is required to further reverse engineer the rest.

The Force Feedback configuration is sent continuously over the wireless link, which takes the form of a 31 byte payload. The wheel is capable of supporting 4 simultaneous effects, plus an additional auto-center effect.  The various effects are upload into 'slots', the format is as follows:

The Force Feedback configuration is sent continuously over the wireless link, which takes the form of a 31 byte payload. These are seen on the SPI bus as they are sent to the RF24L01 output buffer (register 0xA0).

 

The wheel is capable of supporting 4 simultaneous effects, plus an additional auto-center effect.  The various effects are upload into 'slots', the format is as follows:

: Bytes 1..2 - Negotiated SubChannel Address

: Bytes 1..2 - Negotiated SubChannel Address

: Byte 3 - Receive Ack (0x40 saw packet, 0x80 missed packet, 0x20 awaiting sync, 0x07..0x04 sync received, 0x10?).

: Byte 3 - Receive Ack (0x40 saw packet, 0x80 missed packet, 0x20 awaiting sync, 0x07..0x04 sync received, 0x10?).