MicroPython Forum (Archive)

Hi,
I have problems with WiFi connection on boards with ESP32S2. I have two types of ESP boards, Espressif ESP32-S2-Saola-1R and my own boards (custom design). I use fresh version of Micropython GENERIC-S2 (clone from Github) compiled with IDF 4.3. All technologies that need SPI, I2C, GPIO inputs/outpust work well, but I have problems with Wifi comunication. Connection to wifi works fine, but subsequent communication does not work.

Simple log with upip install for example :

connecting to network...
network config: ('192.168.1.109', '255.255.255.0', '192.168.1.1', '192.168.1.1')
7c:df:a1:17:a9:b8
Installing to: /lib/
Error: Unable to resolve micropython.org (no Internet?)

on all my ESP8266, ESP32 boards the same code works fine

Do you have any idea, please ???

It could be a RAM exhaustion problem. That was reported earlier. Try to reduce the size of RAM allocated for the heap. That happens in main.c at about line 123. Change that to:

size_t mp_task_heap_size = heap_caps_get_largest_free_block(MALLOC_CAP_8BIT) - (12 * 1024);

There is a similar code at line 118, which is excuted by a SPIRAM build on a non-SPIRAM device.

Thank you very much !
With this memory heap setting the program collapsing after interface was activate ....

import network
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)

crash.....

That's strange. I had to do exactly that to get it running. What is reported by gc.mem_free()? Maybe now the heap os too small. You could try other reduction sizes, like 8 * 1024. This change just leaves some more RAM for the non-heap malloc, which is required by the IP stack. If malloc fails, it just silently refuses to work.

Value 10*1024 seems to be ok. I have to do more tests, but the current situation looks much better. ESP is connected to WiFi, ESP is connected a subscribbed to MQTT broker, sends and receives MQTT messages

Roberthh,

That was reported earlier

I had a look for specific ESP32S2 issues and couldn't find one about RAM exhaustion.

Does this only affect the ESP32S2?

Thanks

It affects only the ESP32S2, because it has less RAM than the standard ESP32.
The discussion took place at the MicroPython Git repository, e.g. https://github.com/micropython/micropython/issues/7214 or https://github.com/micropython/micropython/pull/7163

Thank you.