Identify/Download Function Breaks Frequently

[PropGit]

Very frequently, the Identification and/or Download function stops functioning correctly. I've seen a similar behavior in a previous version but it stopped before I could capture it.

With a BASIC Stamp 2 plugged in and powered up, here's what a good Identification sequence looks like from v0.5.0 on my Chromebook:

The Host DTR (Reset) signal and Host Tx break condition (and reflection on Host Rx) looks great, then about 130 ms after break ends, the Host Tx transmits "B", "S", "2" and the Host RX receives the reflections as well as the responses from the module. All is well and the Parallax IDE's Identification overlay looks perfect.

When things go bad, every time I try to Identify, it looks like this:

The Host DTR (Reset and Host Tx break conditions still have the same timing as in the good case, but there is no serial transmission (Host Tx of "B", "S", "2", or anything else) at all. Then it seems to reset again. Here's a zoomed-out view. Five resets, like it's trying to identify a BS2, BS2e, BS2sx, BS2p, and BS2pe... but there's no serial data transmitted by Parallax IDE.

The only way to recover from this seems to be to close Parallax IDE and restart it.

[PropGit]

This condition happens at seemingly random times. Once it starts, it seems to continue on forever during that session. I haven't figure out all the steps that lead to this issue, but one thing I noticed that creates the failure predictably is:

• Close and restart Parallax IDE while the BS2 is plugged in and powered
• Press Ctr+I to do an Identify
  • It should properly identify the Stamp each time you do this
• Power down the Stamp (do not disconnect it)
• Click Refresh button [# 1]
  • It can't find the BS2 (understandably)
• Power up the Stamp
• Click Refresh button again [# 2]
  • It can't find the BS2 ever again, until Parallax IDE is restarted

[# 1] - Capture from powered-down refresh click. Looks good, it's trying to find each possible model

[# 2] - Capture from powered-up refresh click. Parallax IDE fails to send serial data ever again

[PropGit]

Doesn't appear to be fixed, or there may be other leaks. See "a more in-depth video" in Issue #194.

[PropGit]

I'm reopening this issue because the repair performed, while it must have improved things, did not fix this problem.

[PropGit]

Closing this issue as it is referenced by a similar issue, #194.