On Fri, Feb 26, 2021, 12:14 PM coderman <[1]coderman@protonmail.com>
   wrote:

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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:
      [2]https://github.com/xloem/brainflow/blob/ecd1049f3a4146bd24a0b21f
     50b5267eb1d6190d/src/utils/libftdi_serial.cpp#L40

   At [3]https://github.com/xloem/brainflow/blob/ecd1049f3a4146bd24a0b21f5
   0b5267eb1d6190d/src/utils/libftdi_serial.cpp#L34 I pass a pointer to
   the stack to a function that will deallocate from the heap.  Maybe I
   fix that and reboot my system, it will be enough voodoo.

     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:
      [4]https://github.com/punyal/Contiki_3-IPsec/blob/93130cd1123f36259
     4e915283dbf7f2783eeea43/platform/mulle/tools/scan_ftdi/scan_ftdi.c#L
     17
     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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References

   1. mailto:coderman@protonmail.com
   2. https://github.com/xloem/brainflow/blob/ecd1049f3a4146bd24a0b21f50b5267eb1d6190d/src/utils/libftdi_serial.cpp#L40
   3. https://github.com/xloem/brainflow/blob/ecd1049f3a4146bd24a0b21f50b5267eb1d6190d/src/utils/libftdi_serial.cpp#L34
   4. https://github.com/punyal/Contiki_3-IPsec/blob/93130cd1123f362594e915283dbf7f2783eeea43/platform/mulle/tools/scan_ftdi/scan_ftdi.c#L17