is printf from newlib?

[mathildawyx]

Is it from the newlib, because I can't find the detailed function body?
I'v search the code and forum but have not get the conclusion.
sorry I don't know much about newlib， i'm learning

[ESP_Sprite]

Yes, it is. Our newlib is partially in ROM and partially in a binary library in ESP-IDF, but we publish the sources on Github.

[mathildawyx]

Thanks!

[mathildawyx]

I‘m sorry it's a little hard for me..
Is there any protection to prevent two core printting log at the same time to prevent disorder log，or do you suggest to use ESP_LOGI/ESP_LOGW...？ Thanks

[ESP_Sprite]

Yes, there should be. You can also use the ESP_LOG* calls, they can be more handy if you want to use different log levels.

[mathildawyx]

sorry i'm feeling a little confused.. there should be means there is or there isnot..

[mathildawyx]

thank you for your answer by the way

[mathildawyx]

I check the source code you provide, it seems no protect in printf when it comes to 2 cores printing at the same time? Am I missing something? Thanks

[ESP_Sprite]

Sorry, I'm decently sure printf has locks somewhere in the pipeline, but I can't tell you for sure where...

[WiFive]

https://github.com/espressif/newlib-esp ... ntf.c#L853