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Steam controller handling

Rust library to work with the Steam controller.

Protocol

There's a script in support/ to help out with reversing the protocol, the following is what I know so far.

Header

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                               |            Status             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Status

It's a 16 bit flag, the values below are in big endian.

0x0301 means the device is sending power events.
0x040b means the device is idle.
0x013c means the device is sending input.

Power

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|     Event     |    Garbage?   |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Event

It's an unsigned char.

0x01 means power off.
0x02 means power on.

Garbage?

Seems to be a monotonically increasing value after the controller has been turned on.

Can't find a pattern in it so far.

Idle

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                          Sequence                             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                          Garbage?                             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Sequence

It's a little endian unsigned int, it's increased by one with every read.

Input

 0                   1                   2                   3
 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Sequence                            |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                    Buttons                    |  Left Trigger |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Right Trigger |                                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|          Left Pad X           |           Left Pad Y          |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|         Right Pad X           |          Right Pad Y          |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                               |                               |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|       Orientation Roll        |        Orientation Yaw        |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|       Orientation Pitch       |       Acceleration Roll       |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|       Acceleration Yaw        |       Acceleration Pitch      |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Unknown                             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|                           Unknown                             |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

Sequence

It's a little endian unsigned int, it's increased by one with every read.

Buttons

It's a 24 bit set, the values below are in big endian.

0b100000000000000000000000 the A button has been pressed.
0b001000000000000000000000 the B button has been pressed.
0b010000000000000000000000 the X button has been pressed.
0b000100000000000000000000 the Y button has been pressed.
0b000000000000000000000010 the pad is being pressed.
0b000000000000000000001000 the pad is being touched.
0b000000000000000001000000 the analog has been pressed.
0b000000000000100000000000 the pad down side has been pressed.
0b000000000000010000000000 the pad left side has been pressed.
0b000000000000001000000000 the pad right side has been pressed.
0b000000000000000100000000 the pad up side has been pressed.
0b000000000000000000000100 the trackpad has been pressed.
0b000000000000000000010000 the trackpad has been touched.
0b000000000001000000000000 the back button has been pressed.
0b000000000010000000000000 the home button has been pressed.
0b000000000100000000000000 the forward button has been pressed.
0b000010000000000000000000 the left bumper has been pressed.
0b000001000000000000000000 the right bumper has been pressed.
0b00000001000000000000000 the left grip has been pressed.
0b00000000000000000000001 the right grip has been pressed.
0b000000100000000000000000 the left trigger has been fully pressed.
0b000000010000000000000000 the right trigger has been fully pressed.

Left trigger

It's an unsigned byte for the pressure applied to the trigger.