Solved:
it's necessary to call
rtc_gpio_deinit(PIN_LED_RELAY3);

In this way the pin is connected again to GPIO Matrix instead of RTC Matrix.

Hi,
to automatically configure firmware I need to read the voltage of a pin (GPIO13) that is normally used as output. Unfortunately it's not useful to read the logic level (same value for the two hardware configurations) so I need to use ADC.
The code is:

#define PIN_LED_RELAY2 13

int adc_raw ...

Hi,
is there a more detailed documentation of the security configuration flags of Esp32 Flash Download Tool?
Thank you

I think the pulse filter clock is only APB_CLK so I used pwm peripheral and this works for me.

Hi,
I need to use one ESP32-WROOM-32 to decode an OOK radio signal with minimum pulse of 250us and idle time of 10ms. When there isn't radio signal the receiver has a very noisy output and so I need to filter small pulses but the maximum interval I can set using APB_CLK is 255 * 1/APB_CLK and it is ...

Cloning the sdk from https://github.com/espressif/esp-idf.git it works.

Many thanks.

Hi,
below the result of the two commands you asked me:

xtensa-esp32-elf-objdump -f /opt/esp-idf-sdk/components/esp32/lib/libcore.a
In archive /opt/esp-idf-sdk/components/esp32/lib/libcore.a:

misc_nvs.o: file format elf32-little
architecture: UNKNOWN!, flags 0x00000011:
HAS_RELOC, HAS_SYMS
start ...

file /opt/esp-idf-sdk/components/esp32/lib/libcore.a

shows

libcore.a: current ar archive

Thank you for quick answer and sorry for my delay.

The requested output is:

$ xtensa-esp32-elf-ld --version
GNU ld (crosstool-NG crosstool-ng-1.22.0-80-g6c4433a) 2.25.1
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the ...

Hi,
compiling hello-world example the linker command shows a lot of errors about all the libraries. The messages are like these:

make
LD build/hello-world.elf
/usr/bin/../lib/gcc/xtensa-esp32-elf/5.2.0/../../../../xtensa-esp32-elf/bin/ld: skipping incompatible /opt/esp-idf-sdk/components/esp32 ...