rmt_encode_simple passes incorrect symbols_free parametr to callback (IDFGH-13742)

[vladislav06]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

IDF version.

V5.3

Espressif SoC revision.

ESP32-S3

Operating System used.

Linux

How did you build your project?

Command line with idf.py

If you are using Windows, please specify command line type.

None

Development Kit.

Custom board

Power Supply used.

USB

What is the expected behavior?

rmt_encode_simple must provide free space in symbols buffer with symbols_free parameter for the callback. In my case that is 192 symbols.

What is the actual behavior?

For the first call rmt_encode_simple calls callback with symbols_free set to 384, which causes buffer overflow and unexpected behavior, such as garbage in between correct signal:

Steps to reproduce.

In callback for rmt_encode_simple fill symbols buffer with symbols_free amount of rmt_symbol_word_t symbols.

Debug Logs.

No response

More Information.

If symbols_free is capped at 192, everything works as expected.