About Viewing source code of libraries used

SSrid.1 · ‎2021-10-26

I am using STM32L4 series microcontroller. I am debugging some code which uses standard C lib function fopen() and fread(). The code can be compiled and has no errors. For some reason fopen() function is returning NULL pointer when used. I wanted to check where is the problem.

Hence I would like to see he source code of stdio lib functions. I can see assembly code but not C code. Help me to view source code of C lib functions.

Pavel A. · ‎2021-10-26

> For some reason fopen() function is returning NULL pointer

What else do you expect? What is the filename that you open?

SSrid.1 · ‎2021-10-27

It should return anything other than NULL if it is ok.

Pavel A. · ‎2021-10-28

So fopen tells you something is not OK. Maybe it does not find any files on the barebone STM32?

Do you use CubeIDE or some other IDE which has semihosting?