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from collections import namedtuple
"""
write: set to True to enable writing this parameter to FASM
numeric: set to True to write this parameter as a bit array (width>1) or
single bit (width==1) named after the parameter. Otherwise this
parameter will be written as `name.value`
width: width of numeric parameter (ignored for non-numeric parameters)
alias: an alternative name for this parameter (parameter name used if alias
is None)
"""
ParameterConfig = namedtuple('ParameterConfig', 'write numeric width alias')
# FIXME use defaults= once Python 3.7 is standard
ParameterConfig.__new__.__defaults__ = (False, True, 1, None)
"""
Write a design as FASM
ctx: nextpnr context
paramCfg: map from (celltype, parametername) -> ParameterConfig describing how to write parameters
f: output file
"""
def write_fasm(ctx, paramCfg, f):
for nname, net in sorted(ctx.nets, key=lambda x: str(x[1].name)):
print("# Net %s" % nname, file=f)
for wire, pip in sorted(net.wires, key=lambda x: str(x[1])):
if pip.pip is not None:
print("%s" % pip.pip, file=f)
print("", file=f)
for cname, cell in sorted(ctx.cells, key=lambda x: str(x[1].name)):
print("# Cell %s at %s" % (cname, cell.bel), file=f)
for param, val in sorted(cell.params, key=lambda x: str(x)):
cfg = paramCfg[(cell.type, param)]
if not cfg.write:
continue
fasm_name = cfg.alias if cfg.alias is not None else param
if cfg.numeric:
if cfg.width == 1:
if int(val) != 0:
print("%s.%s" % (cell.bel, fasm_name), file=f)
else:
# Parameters with width >32 are direct binary, otherwise denary
print("%s.%s[%d:0] = %d'b%s" % (cell.bel, fasm_name, cfg.width-1, cfg.width, val), file=f)
else:
print("%s.%s.%s" % (cell.bel, fasm_name, val), file=f)
print("", file=f)
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