Bus services

gpio

Cmd	Name
0	OpenGpioRaw
1	OpenGpioById
2
3
4
5
6

OpenGpioById

Same thing as OpenGpioByRaw except the descriptor is looked up in a table:

Input id	GpioDescriptor
2	0x24
4	0xDA
5	0xDB
6	0xDC
7	0x25
8	0x90
9	0x91
..	..

GpioDescriptor

Bits	Description
7-5	Controller index
4-3	Port index
2-0	Pin number

i2c

Cmd	Name	Notes
0		Black screen hang.
1		Takes a word. Returns a session handle.
2		Returns a u8/bool.
3		Black screen hang.

uart

Cmd	Name	Notes
0		Returns a u8/bool.
1		Returns a u8/bool.
2		Returns a u8/bool.
3		Returns a u8/bool.
4		Takes marshalled arguments.
5		Takes marshalled arguments.
6		Returns a handle to an IPC session #IUartSubinterface.

IUartSubinterface

Cmd	Name	Notes
0		Takes marshalled arguments
1		Takes marshalled arguments
2
3		Takes marshalled arguments
4		Returns 2x u64. Both zero.