149 lines
3.2 KiB
Python
149 lines
3.2 KiB
Python
from migen.fhdl.std import *
|
|
from migen.actorlib.structuring import *
|
|
from migen.genlib.fsm import FSM, NextState
|
|
|
|
from misoclib.com.liteusb.common import *
|
|
|
|
class LiteUSBPacketizer(Module):
|
|
def __init__(self):
|
|
self.sink = sink = Sink(user_layout)
|
|
self.source = source = Source(phy_layout)
|
|
|
|
# Packet description
|
|
# - preamble : 4 bytes
|
|
# - dst : 1 byte
|
|
# - length : 4 bytes
|
|
# - payload
|
|
header = [
|
|
# preamble
|
|
0x5A,
|
|
0xA5,
|
|
0x5A,
|
|
0xA5,
|
|
# dst
|
|
sink.dst,
|
|
# length
|
|
sink.length[24:32],
|
|
sink.length[16:24],
|
|
sink.length[8:16],
|
|
sink.length[0:8],
|
|
]
|
|
|
|
header_unpack = Unpack(len(header), phy_layout)
|
|
self.submodules += header_unpack
|
|
|
|
for i, byte in enumerate(header):
|
|
chunk = getattr(header_unpack.sink.payload, "chunk" + str(i))
|
|
self.comb += chunk.d.eq(byte)
|
|
|
|
fsm = FSM()
|
|
self.submodules += fsm
|
|
|
|
fsm.act("WAIT_SOP",
|
|
If(sink.stb & sink.sop, NextState("SEND_HEADER"))
|
|
)
|
|
|
|
fsm.act("SEND_HEADER",
|
|
header_unpack.sink.stb.eq(1),
|
|
source.stb.eq(1),
|
|
source.d.eq(header_unpack.source.d),
|
|
header_unpack.source.ack.eq(source.ack),
|
|
If(header_unpack.sink.ack, NextState("SEND_DATA"))
|
|
)
|
|
|
|
fsm.act("SEND_DATA",
|
|
source.stb.eq(sink.stb),
|
|
source.d.eq(sink.d),
|
|
sink.ack.eq(source.ack),
|
|
If(source.ack & sink.eop, NextState("WAIT_SOP"))
|
|
)
|
|
|
|
#
|
|
# TB
|
|
#
|
|
src_data = [
|
|
(0x01, 4,
|
|
[0x0, 0x1, 0x2, 0x3]
|
|
),
|
|
(0x16, 8,
|
|
[0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7]
|
|
),
|
|
(0x22, 16,
|
|
[0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xA, 0xB, 0xC, 0xD, 0xE, 0xF]
|
|
),
|
|
]
|
|
|
|
class PacketizerSourceModel(Module, Source, RandRun):
|
|
def __init__(self, data):
|
|
Source.__init__(self, user_layout, True)
|
|
RandRun.__init__(self, 25)
|
|
self.data = data
|
|
|
|
self._stb = 0
|
|
self._sop = 0
|
|
self._eop = 0
|
|
self._frame_cnt = 0
|
|
self._payload_cnt = 0
|
|
|
|
def do_simulation(self, selfp):
|
|
RandRun.do_simulation(self, selfp)
|
|
dst, length, payload = self.data[self._frame_cnt]
|
|
|
|
if selfp.stb and selfp.ack:
|
|
if self._payload_cnt == length-1:
|
|
self._frame_cnt += 1
|
|
self._payload_cnt = 0
|
|
else:
|
|
self._payload_cnt += 1
|
|
if self.run:
|
|
self._stb = 1
|
|
else:
|
|
self._stb = 0
|
|
|
|
if self.run and not self._stb:
|
|
self._stb = 1
|
|
|
|
self._sop = int((self._payload_cnt == 0))
|
|
self._eop = int((self._payload_cnt == length-1))
|
|
|
|
selfp.stb = self._stb
|
|
selfp.sop = self._sop & self._stb
|
|
selfp.eop = self._eop & self._stb
|
|
selfp.dst = dst
|
|
selfp.length = length
|
|
selfp.d = payload[self._payload_cnt]
|
|
|
|
if self._frame_cnt == len(self.data):
|
|
raise StopSimulation
|
|
|
|
class PacketizerSinkModel(Module, Sink, RandRun):
|
|
def __init__(self):
|
|
Sink.__init__(self, phy_layout)
|
|
RandRun.__init__(self, 25)
|
|
|
|
def do_simulation(self, selfp):
|
|
RandRun.do_simulation(self, selfp)
|
|
if self.run:
|
|
selfp.ack = 1
|
|
else:
|
|
selfp.ack = 0
|
|
|
|
|
|
class TB(Module):
|
|
def __init__(self):
|
|
self.submodules.source = PacketizerSourceModel(src_data)
|
|
self.submodules.dut = LiteUSBPacketizer()
|
|
self.submodules.sink = PacketizerSinkModel()
|
|
|
|
self.comb +=[
|
|
self.source.connect(self.dut.sink),
|
|
self.dut.source.connect(self.sink),
|
|
]
|
|
|
|
def main():
|
|
from migen.sim.generic import run_simulation
|
|
run_simulation(TB(), ncycles=400, vcd_name="tb_packetizer.vcd")
|
|
|
|
if __name__ == "__main__":
|
|
main()
|