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build.res: allow querying frequency of a previously constrained clock.

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This commit is contained in:
whitequark 2019-06-05 12:51:53 +00:00
parent c9879c795b
commit b45c5119f5
2 changed files with 27 additions and 6 deletions
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21
nmigen/build/res.py
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@ -191,11 +191,9 @@ class ResourceManager:
for bit, pin_name in enumerate(pin_names):
yield "{}[{}]".format(port_name, bit), pin_name, attrs
def add_clock_constraint(self, clock, frequency):
def _map_clock_to_port(self, clock):
if not isinstance(clock, (Signal, Pin)):
raise TypeError("Object {!r} is not a Signal or Pin".format(clock))
if not isinstance(frequency, (int, float)):
raise TypeError("Frequency must be a number, not {!r}".format(frequency))
if isinstance(clock, Pin):
for res, pin, port, attrs in self._ports:
@ -208,16 +206,27 @@ class ResourceManager:
assert False
break
else:
raise ValueError("Cannot add clock constraint on a Pin {!r} that is not "
"a previously requested resource"
raise ValueError("The Pin object {!r}, which is not a previously requested "
"resource, cannot be used to desigate a clock"
.format(clock))
return clock
def add_clock_constraint(self, clock, frequency):
if not isinstance(frequency, (int, float)):
raise TypeError("Frequency must be a number, not {!r}".format(frequency))
clock = self._map_clock_to_port(clock)
if clock in self._clocks:
raise ValueError("Cannot add clock constraint on {!r}, which is already constrained "
"to {} Hz"
.format(clock, self._clocks[clock]))
else:
self._clocks[clock] = float(frequency)
self._clocks[clock] = float(frequency)
def get_clock_constraint(self, clock):
clock = self._map_clock_to_port(clock)
return self._clocks[clock]
def iter_clock_constraints(self):
return iter(self._clocks.items())