59874188a6
This won't affect Python-built arches significantly; but will be useful for the future 'viaduct' functionality where generic routing graphs can be built on the C++ side; too. Signed-off-by: gatecat <gatecat@ds0.me>
51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
from collections import namedtuple
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"""
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write: set to True to enable writing this parameter to FASM
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numeric: set to True to write this parameter as a bit array (width>1) or
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single bit (width==1) named after the parameter. Otherwise this
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parameter will be written as `name.value`
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width: width of numeric parameter (ignored for non-numeric parameters)
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alias: an alternative name for this parameter (parameter name used if alias
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is None)
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"""
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ParameterConfig = namedtuple('ParameterConfig', 'write numeric width alias')
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# FIXME use defaults= once Python 3.7 is standard
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ParameterConfig.__new__.__defaults__ = (False, True, 1, None)
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"""
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Write a design as FASM
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ctx: nextpnr context
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paramCfg: map from (celltype, parametername) -> ParameterConfig describing how to write parameters
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f: output file
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"""
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def write_fasm(ctx, paramCfg, f):
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for nname, net in sorted(ctx.nets, key=lambda x: str(x[1].name)):
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print("# Net %s" % nname, file=f)
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for wire, pip in sorted(net.wires, key=lambda x: str(x[1])):
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if pip.pip is not None:
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print("%s" % pip.pip, file=f)
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print("", file=f)
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for cname, cell in sorted(ctx.cells, key=lambda x: str(x[1].name)):
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print("# Cell %s at %s" % (cname, cell.bel), file=f)
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for param, val in sorted(cell.params, key=lambda x: str(x)):
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cfg = paramCfg[(cell.type, param)]
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if not cfg.write:
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continue
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fasm_name = cfg.alias if cfg.alias is not None else param
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if cfg.numeric:
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if cfg.width == 1:
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if int(val) != 0:
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print("%s.%s" % (cell.bel, fasm_name), file=f)
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else:
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# Parameters with width >32 are direct binary, otherwise denary
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print("%s.%s[%d:0] = %d'b%s" % (cell.bel, fasm_name, cfg.width-1, cfg.width, val), file=f)
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else:
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print("%s.%s.%s" % (cell.bel, fasm_name, val), file=f)
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print("", file=f) |