| 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 != "": |
| 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) |
