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ftdi: preserve original latency timer on close #418

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ftdi: preserve original latency timer on close #418

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4 changes: 3 additions & 1 deletion pyftdi/ftdi.py
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Original file line number Diff line number Diff line change
Expand Up @@ -329,6 +329,7 @@ def __init__(self):
self._in_ep = None
self._out_ep = None
self._bitmode = Ftdi.BitMode.RESET
self._orig_latency = self.LATENCY_MAX
self._latency = 0
self._latency_count = 0
self._latency_min = self.LATENCY_MIN
Expand Down Expand Up @@ -552,6 +553,7 @@ def open_from_device(self, device: UsbDevice,
self.set_bitmode(0, Ftdi.BitMode.RESET)
# Init latency
self._latency_threshold = None
self._orig_latency = self.get_latency_timer()
self.set_latency_timer(self.LATENCY_MIN)
self._debug_log = self.log.getEffectiveLevel() == DEBUG

Expand All @@ -574,7 +576,7 @@ def close(self, freeze: bool = False) -> None:
try:
if not freeze:
self.set_bitmode(0, Ftdi.BitMode.RESET)
self.set_latency_timer(self.LATENCY_MAX)
self.set_latency_timer(self._orig_latency)
release_interface(dev, self._index - 1)
except FtdiError as exc:
self.log.warning('FTDI device may be gone: %s', exc)
Expand Down