Serial::end hang

[lbernstone]

workaround for #5043. There is a timing issue with HardwareSerial::end. I'm not sure what is hung, but it should be possible to see this in jtag, as it does cause a reboot if you let it. The delay needs to be before you detach the device!?

[thorv]

Even after applying that change, the program in #5043 still hangs on my ESP32 devkit-c / Arduino lib 1.0.6 .

[SuGlider]

This issue is related to issue #5112
Actually the issue #5112 occurs when HardwareSerial::end() is called in Serial::begin().
PR #5385 should solve the issue #5047 as well.

Issue can now be closed.

[ZinggJM]

I still get posts related to this issue: #5043.

Please re-open the issue, so other users can give it a "booster shot"!

See e.g. https://forum.arduino.cc/t/esp32-e-paper-display-upload-but-no-output/927375/3

[SuGlider]

@ZinggJM
Why reopen this issue?
It is solved in Arduino Core v2.0.0+

Are you still using core 1.0.6 or PlatformIO (which is still using 1.0.6)?

[ZinggJM]

Yes, the installed version is 1.0.6 on Arduino IDE 1.8.15.
The highest version the Arduino Boards Manager offers is 1.0.6.
I usually update boards and libraries when the Arduino IDE reports updates available.

[me-no-dev]

@ZinggJM you are probably using the old board manager link. Please update it: https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html#installing-using-boards-manager

[ZinggJM]

Yes, like so many others, I assume!
With the new link I get an error message when opening Boards Manager:

Skipping contributed index file C:\Users\ZinggJ\AppData\Local\Arduino15\installing.html, parsing error occured:
com.fasterxml.jackson.core.JsonParseException: Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: (FileInputStream); line: 1, column: 2]
Skipping contributed index file C:\Users\ZinggJ\AppData\Local\Arduino15\installing.html, parsing error occured:
com.fasterxml.jackson.core.JsonParseException: Unexpected character ('<' (code 60)): expected a valid value (number, String, array, object, 'true', 'false' or 'null')
at [Source: (FileInputStream); line: 1, column: 2]

[me-no-dev]

This error is not related to our link. You are the first to report such issue. Maybe some issue with firewall or downloading?

[ZinggJM]

I will check again on a different notebook.

Please note that https://github.com/arduino/Arduino/wiki/Unofficial-list-of-3rd-party-boards-support-urls
still has Espressif ESP32: https://dl.espressif.com/dl/package_esp32_index.json

[ZinggJM]

With the line removed, the error went away.

[ZinggJM]

Aha, your link is a link to the link, not the link itself. Thanks.

[me-no-dev]

@ZinggJM thanks for noting the old link in Arduino. I have updated it.