Custom SPI Pin Configuration support for ESP32-S3 (ESPTOOL-733)

[alanmosely]

Is your feature request related to a problem?

I would like to be able to save data directly to an external flash on a custom PCB with an ESP32-S3 as part of my production line

Describe the solution you'd like

I would like support for Custom SPI Pin Configuration in esptool.py for ESP32-S3 devices, I am trying to target SPI2. I would like the following command to work: esptool.py --chip esp32s3 write_flash --spi-connection 19,20,9,35,47 0x0 storage.bin

Describe alternatives you've considered

I've tried to run the command above but it complains the pins are above 31

Additional context

Is this something I could contribute myself if it is not planned?

[alanmosely]

Somewhat related issues: #243 & #903 & https://www.esp32.com/viewtopic.php?t=24736

[radimkarnis]

Hello @alanmosely,
thank you for the feature request!

this feature is currently implemented only on the classic ESP32.

We will look into the possibility of expanding this to other chips.

[alanmosely]

Thank you, is this something you plan on doing soon? Is it something that I could help to build?
If no to both, how would you advise addressing my issue of needing to flash an external chip as part of my production line?

[radimkarnis]

is this something you plan on doing soon?

This is currently not planned to be done in this quarter. We will re-evaluate the priority of this task and see if this can be done during the next quarter.

Is it something that I could help to build?

You can definitely try helping build that, PRs are more than welcome!

Pointers:

• Attaching SPI flash in the stub flasher:
  https://github.com/espressif/esptool/blob/master/flasher_stub/stub_commands.c#L182-L197
  https://github.com/espressif/esptool/blob/master/flasher_stub/stub_flasher.c#L472-L491
• Attaching SPI flash in esptool:
  https://github.com/espressif/esptool/blob/master/esptool/__init__.py#L739-L750

[alanmosely]

Thank you