dau_driver.transfer

Classes

DmaDirection	Enum where members are also (and must be) strings
DmaTransfer

Functions

validate_transfer(direction, device_address, ...[, ...]) → None

Refuse a transfer the device cannot perform as asked.

Module Contents

class dau_driver.transfer.DmaDirection

Bases: enum.StrEnum

Enum where members are also (and must be) strings

Initialize self. See help(type(self)) for accurate signature.

H2C = 'h2c'

C2H = 'c2h'

class dau_driver.transfer.DmaTransfer

direction: DmaDirection

device_address: int

byte_count: int

channel_path: pathlib.Path

dau_driver.transfer.validate_transfer(direction: DmaDirection, device_address: int, byte_count: int, constraints: dau_core.capabilities.DmaConstraints, *, memory_bytes: int | None = None) → None

Refuse a transfer the device cannot perform as asked.

memory_bytes is the device’s addressable memory when the caller knows it; with it, the whole span [device_address, device_address + byte_count) must lie inside memory, since the DMA engine wraps an address past the end to the bottom of memory instead of failing.