ESP32-gateway...different revision

[luca1978]

i have 3 unit:

-1 unit....esp32-gateway revision E (works correctly)
-2 units...esp32-gateway revision G (not works)

i installed mini lcd in both units to pin 11-12-13-14 and i connect pins 12 to 9....in revision E it's correct work, but in revision G no...

can you help me?

best regrads
Luca

[LubOlimex]

There are major changes between those two revisions.

> i installed mini lcd in both units to pin 11-12-13-14 and i connect pins 12 to 9....in revision E it's correct work, but in revision G no...

GPIO9, GPIO10, GPIO11 in revision E shouldn't be used in first place since they are connected to the internal memory. In newer revision they were completely re-routed from the headers so that you can't affect the memory. Probably one of these two major changes affect your work:

- GPIO6-11, which are used by the ESP32's internal flash, were disconnected from CON1 and the 6 SD card signals are now routed instead for use when SD card is not present;
- SD card changed from 4-bit mode of operation to 1-bit mode of operation! Added 3 NA resistor pads (R9-R11) for backwards compatibility.

You can find full revision changes and track the changes that occured from revision E to revision G here:

https://github.com/OLIMEX/ESP32-GATEWAY/blob/master/HARDWARE/README.md

[luca1978]

ok, quindi non c'è modo di farlo funzionare? dovrei trovare due schede con revisione E?

[LubOlimex]

Can you use other free GPIO pins instead of GPIO9, GPIO10, GPIO11?