True, this header file is part of newlib, however all functions are within #if defined(_POSIX_THREADS) block, and _POSIX_THREADS option is not enabled when building newlib.

Newlib implements C standard library plus some extensions. Most of the standard library works on the ESP32. Things which don't work yet include: - time() and clock() functions - functions which read from standard input: scanf, getc, gets, and so on. - functions which operate on FILEs, such as fopen,...

Regarding ESP32 toolchain for Linux ARM hosts: thanks for a reminder, I will add it to the list of pre-built toolchains.

Most certainly, we would like to generate doxygen docs automatically during our CI builds.
I'm leaving for a vacation tomorrow but I'll see if someone on the team can take on this task!

You can use calloc, which is part of C standard library.

Just to clarify a bit: currently application developers are not supposed to call esp_wifi_init, it is called automatically from startup code. One only needs to configure wifi settings in app_main function. This, however, is going to change in the coming days, as app_main callback will be removed, an...

It's a bug, we fail to set chip size member in global flashchip structure to the size found in the binary image header. Default value is 2 megabytes, and it's not updated in the 2nd stage bootloader. I haven't gotten around to fix it yet. Here's the line you may add as a workaround: https://github.c...

I think this information is available from ESP32 Pin List document:

http://espressif.com/sites/default/file ... ist_en.pdf

There are normal spi_flash_read/write APIs which allow data to be read and written without encryption, and there are also spi_flash_read_decrypt/write_encrypt APIs (not merged into master yet), which decrypt/encrypt data. So you (or the one who implements a filesystem, for example) can decide. Encry...

Some parts of OTP, such as flash encryption key, are not readable from application. It is generated by hardware and stored in OTP. Flash decryption engine can load encryption key directly from OTP. While you can't dump encryption key directly, you can use bootloader mode to dump contents of flash me...