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STM32f746G-disco, SD card, FatFs, f_open returns FR_NO_FILESYSTEM

Question asked by koutsopoulos.and.001 on Jan 29, 2016
I have an application which consists of 2 threads. One thread is implementing an http client
and the other writes a file in the sd card. When i run the threads seperately they work fine,
however when I run them at the same time the f_open function returns FR_NO_FILESYSTEM.
It turns out that that is probably caused by the lwIP stack initialization function of the first thread.
I would be glad if anyone had any idea.

Thank you.