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November 2, 2019 01:31
Also added to SerialDevice and the default implementation. A queue selection enum is included to easily signal which queue should be purged.
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Both Windows and Unix have functions (
PurgeCommandtcflush) that clear out the underlying send and receive buffers without sending the data. This can be useful for call-and-response serial connections, where it makes sense to discard any existing data as invalid. There is a user demand for this addition (#56). This PR proposes a purge API and provides a Windows implementation.Both
PurgeCommandtcflushare single functions that accept a parameter indicating whether the input/receive queue, the output/send queue, or both queues should be flushed. This mimics that arrangement, adding apurge(&self, queue: Queue)toSerialPortandSerialDevice. TheQueueenum allows for input, output, or both.On Windows,
purgeis implemented using a single call toPurgeComm. The Unix implementation should be similar, but I don't have a machine nearby to test with, so this is submitted as a draft PR for now with no Unix implementation.