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Messages - scotttmiller

Pages: [1]
1
Discussion - Drivers / Re: VCP driver on macOS 11
« on: September 27, 2021, 01:33:07 AM »
Thanks again! That is indeed a useful doc.  What is the latest version of MacOS for which those instructions are valid?

2
Discussion - Drivers / Re: VCP driver on macOS 11
« on: September 22, 2021, 12:08:53 PM »
Thanks for the docs.   The VCP doc is informative, but it does not contain instructions for MacOS.  Can you please also send me instructions for reconfiguring your VCP driver on MacOS.

3
Discussion - Drivers / Re: VCP driver on macOS 11
« on: September 17, 2021, 05:17:52 PM »
Yes I am trying to modify the Info.plist to adjust the latency and buffer settings, because I am experiencing extreme jitter in the timestamp intervals.  The issue is so severe that unless I can correct it, I cannot use the FTDI chip for my experiments.

My teammate is using the same chip on his older, Intel-based MacBook Pro.  He is also running the latest version of Big Sur.  He tried the unmodified 1.4.7 driver, and a modified 2.4.4 driver.  The unmodified 1.4.7 provides smoother streaming with less jitter than the modified 2.4.4, but it's still not good enough for our experiments.

The following are the settings he added to the Info.plist of the 2.4.4 driver:

  <dict>
    <key>InBufferSize</key>
    <integer>128</integer>
    <key>LatencyTimer</key>
    <integer>24</integer>
  </dict>

Can you recommend a different driver or different modifications for him?

--Scott

4
Discussion - Drivers / Re: VCP driver on macOS 11
« on: September 17, 2021, 11:58:11 AM »
Hello.  My name is Scott Miller and I am a BCI researcher.  I too am experiencing severe latency issues with the VCP driver on macOS 11.  I am using a MacBook Pro M1 running the latest version of Big Sur.

I read this entire thread and several others blog threads across the internet.  I emailed and spoke with Cameron from FTDI tech support in Oregon.  Cameron was very helpful.  He let me know that the latest 1.4.7 driver runs on both x86_64 and arm64.  I tried modding the 1.4.7 driver on my M1 but ran into the same code signing issues described by others in this thread.

Cameron also reached out to the FTDI team in the UK on my behalf.  That team replied with some links which talk about how to build my own driver, but that's not very useful to me at this point in time.

I also tried calling tech support in Glasgow, during normal working hours in GMT, but was unable to reach anyone at all.  The voice mailboxes are all full, and not even an operator answered my calls.  I tried repeatedly.

I suspect that FTDI is for some reason unable to obtain a DriverKit entitlement from Apple.  Is that the case?  Has FTDI made any progress on this issue?

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