33 lines
974 B
Python
33 lines
974 B
Python
from migen.fhdl.structure import *
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from migen.bank.description import *
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from migen.bank import csrgen
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import re
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def encode_version(version):
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match = re.match("(\d+)\.(\d+)(\.(\d+))?(rc(\d+))?", version, re.IGNORECASE)
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r = (int(match.group(1)) << 12) | (int(match.group(2)) << 8)
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subminor = match.group(4)
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rc = match.group(6)
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if subminor:
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r |= int(subminor) << 4
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if rc:
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r |= int(rc)
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return r
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class Identifier:
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def __init__(self, address, sysid, version):
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self.sysid = sysid
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self.version = encode_version(version)
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self._r_sysid = RegisterField("sysid", 16, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self._r_version = RegisterField("version", 16, access_bus=READ_ONLY, access_dev=WRITE_ONLY)
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self.bank = csrgen.Bank([self._r_sysid, self._r_version], address=address)
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def get_fragment(self):
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comb = [
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self._r_sysid.field.w.eq(self.sysid),
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self._r_version.field.w.eq(self.version)
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]
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return self.bank.get_fragment() + Fragment(comb)
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