mirror of
https://github.com/saymrwulf/uhd.git
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b12b9465ed
This commit combines code from various branches to finally enable both UDP and Liberio transports.
60 lines
1.8 KiB
Python
60 lines
1.8 KiB
Python
#
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# Copyright 2017 Ettus Research, National Instruments Company
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#
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# SPDX-License-Identifier: GPL-3.0
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#
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"""
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Liberio DMA dispatcher table control
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"""
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from builtins import str
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from builtins import object
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from .mpmlog import get_logger
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from .uio import UIO
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class LiberioDispatcherTable(object):
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"""
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Controls a Liberio DMA dispatcher table.
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label -- A label that can be used by udev to find a UIO device
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"""
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def __init__(self, label):
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self.log = get_logger(label)
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self._regs = UIO(label=label, read_only=False)
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self.poke32 = self._regs.poke32
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self.peek32 = self._regs.peek32
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def set_route(self, sid, dma_channel):
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"""
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Sets up routing in the Liberio dispatcher. From sid, only the
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destination part is important. After this call, any CHDR packet with the
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appropriate destination address will get routed to `dma_channel`.
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sid -- Full SID, but only destination part matters.
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dma_channel -- The DMA channel to which these packets should get routed.
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"""
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self.log.debug(
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"Routing SID `{sid}' to DMA channel `{chan}'.".format(
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sid=str(sid), chan=dma_channel
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)
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)
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def poke_and_trace(addr, data):
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" Do a poke32() and log.trace() "
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self.log.trace("Writing to address 0x{:04X}: 0x{:04X}".format(
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addr, data
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))
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self.poke32(addr, data)
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# Poke reg for destination channel
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try:
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poke_and_trace(
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0 + 4 * sid.dst_ep,
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dma_channel,
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)
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except Exception as ex:
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self.log.error(
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"Unexpected exception while setting route: %s",
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str(ex),
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)
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raise
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