litex/misoclib/com/liteusb/common.py

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from migen.fhdl.std import *
from migen.genlib.fsm import *
from migen.actorlib.fifo import *
from migen.flow.actor import EndpointDescription
from migen.actorlib.packet import *
from migen.actorlib.structuring import Pipeline
packet_header_length = 9
packet_header_fields = {
"preamble": HeaderField(0, 0, 32),
"dst": HeaderField(4, 0, 8),
"length": HeaderField(5, 0, 32)
}
packet_header = Header(packet_header_fields,
packet_header_length,
swap_field_bytes=True)
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def phy_description(dw):
payload_layout = [("data", dw)]
return EndpointDescription(payload_layout, packetized=False)
def packet_description(dw):
param_layout = packet_header.get_layout()
payload_layout = [
("data", dw),
("error", dw//8)
]
return EndpointDescription(payload_layout, param_layout, packetized=True)
def user_description(dw):
param_layout = [
("dst", 8),
("length", 32)
]
payload_layout = [
("data", dw),
("error", dw//8)
]
return EndpointDescription(payload_layout, param_layout, packetized=True)
class LiteUSBMasterPort:
def __init__(self, dw):
self.source = Source(user_description(dw))
self.sink = Sink(user_description(dw))
class LiteUSBSlavePort:
def __init__(self, dw, tag):
self.sink = Sink(user_description(dw))
self.source = Source(user_description(dw))
self.tag = tag
class LiteUSBUserPort(LiteUSBSlavePort):
def __init__(self, dw, tag):
LiteUSBSlavePort.__init__(self, dw, tag)