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cores/uart/RS232PHY: add with_dynamic_baudrate parameter and disable it by default. 

Dynamic baudrate is rarely used and enabling it has a non negligeable cost (~100LCs).
This commit is contained in:
Florent Kermarrec 2021-02-16 20:00:43 +01:00
parent 9a8a8c0fe5
commit 285bb96278
1 changed files with 7 additions and 4 deletions
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11
litex/soc/cores/uart.py
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@ -132,10 +132,13 @@ class RS232PHYTX(Module):
class RS232PHY(Module, AutoCSR):
def __init__(self, pads, clk_freq, baudrate=115200):
self._tuning_word = CSRStorage(32, reset=int((baudrate/clk_freq)*2**32))
self.submodules.tx = RS232PHYTX(pads, self._tuning_word.storage)
self.submodules.rx = RS232PHYRX(pads, self._tuning_word.storage)
def __init__(self, pads, clk_freq, baudrate=115200, with_dynamic_baudrate=False):
tuning_word = int((baudrate/clk_freq)*2**32)
if with_dynamic_baudrate:
self._tuning_word = CSRStorage(32, reset=tuning_word)
tuning_word = self._tuning_word.storage
self.submodules.tx = RS232PHYTX(pads, tuning_word)
self.submodules.rx = RS232PHYRX(pads, tuning_word)
self.sink, self.source = self.tx.sink, self.rx.source