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hello Karl!

i haven't had time to dig into this much, but one thing stuck out to me
in how you're using the FTDI content and functions.

here you initialize the ftdi_content, but are using a local structure variable:
 https://github.com/xloem/brainflow/blob/ecd1049f3a4146bd24a0b21f50b5267eb1d6190d/src/utils/libftdi_serial.cpp#L40

once you return from  LibFTDISerial::is_libftdi () function, the ftdi_context will be destroyed.

you'll notice that this context must live as long as the process, otherwise
references to it will become invalid, leading to stack / heap corruption.

for example, this usage calls from main(), where the ftdi_context will
exist as long as the program is running:
 https://github.com/punyal/Contiki_3-IPsec/blob/93130cd1123f362594e915283dbf7f2783eeea43/platform/mulle/tools/scan_ftdi/scan_ftdi.c#L17

you could solve this by declaring a static (global) ftdi_context, however,
 this entails locking / concurrency concerns.


i hope this helps. perhaps later this weekend i dig in depth into your problems.


best regards,

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