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Original file line number | Diff line number | Diff line change |
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@@ -1,12 +1,14 @@ | ||
from migen.fhdl.std import * | ||
from migen.bank.description import * | ||
from migen.bank.eventmanager import * | ||
from migen.genlib.misc import Counter | ||
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class Timer(Module, AutoCSR): | ||
def __init__(self, width=32): | ||
def __init__(self, width=32, prescaler_width=32): | ||
self._load = CSRStorage(width) | ||
self._reload = CSRStorage(width) | ||
self._en = CSRStorage() | ||
self._prescaler = CSRStorage(prescaler_width, reset=1) | ||
self._update_value = CSR() | ||
self._value = CSRStatus(width) | ||
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@@ -15,14 +17,28 @@ def __init__(self, width=32): | |
self.ev.finalize() | ||
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### | ||
enable = self._en.storage | ||
tick = Signal() | ||
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counter = Counter(prescaler_width) | ||
self.submodules += counter | ||
self.comb += [ | ||
If(enable, | ||
tick.eq(counter.value >= (self._prescaler.storage-1)), | ||
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enjoy-digital
Author
Contributor
|
||
counter.ce.eq(1), | ||
counter.reset.eq(tick), | ||
).Else( | ||
counter.reset.eq(1) | ||
) | ||
] | ||
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||
value = Signal(width) | ||
self.sync += [ | ||
If(self._en.storage, | ||
If(enable, | ||
If(value == 0, | ||
# set reload to 0 to disable reloading | ||
value.eq(self._reload.storage) | ||
).Else( | ||
).Elif(tick, | ||
value.eq(value - 1) | ||
) | ||
).Else( | ||
|
Wouldn't
==
be more efficient?