STM32 about various header files No such file&nb

1. First of all, you must clearly understand the meaning of the project setting path. Why do you set this path instead of another one? What is the reason for setting it? Answer: The project setting path is to search for *.h files.

The picture below shows my project path, where the User folder is used to store files that I need to write or modify.

Let's take a look at the files in the User path. The three .c files and two .h files are copied from the STM32F10x_StdPeriph_Lib_V3.5.0ProjectSTM32F10x_StdPeriph_ExamplesSDIO path of the official library.

STM32_EVAL stores the files copied from the official library.

stm32_eval.c

stm32_eval.h

stm32_eval_sdio_sd.c

stm32_eval_sdio_sd.h

stm3210e_eval.c

stm3210e_eval.h

There are 6 files in total. Let's ignore this folder for now.

At this time, compile and you will be prompted

..Userstm32f10x_it.c(26): error: #5: cannot open source input file "stm32_eval_sdio_sd.h": No such file or directory

..Usermain.c(24): error: #5: cannot open source input file "stm32_eval_sdio_sd.h": No such file or directory 

As shown below:

A careful observation will reveal that stm32f10x_it.c and main.c prompt that stm32_eval_sdio_sd.h cannot be found.

Why are there two file prompts? We observed that the header file stm32_eval_sdio_sd.h is referenced at the top of main.c and stm32f10x_it.c, as shown in the figure below:

Oh, it turns out that the .c file references the .h file, and an error is reported if the .h file cannot be found. stm32f10x_it.c also references stm32f10x_it.h? Then why is there no error? See the following figure for the reason:

We store stm32f10x_it.h in the User path, and stm32f10x.c can find stm32f10x.h so no error is reported.

stm32f10x_it.c references stm32f10x.h and stm32_eval_sdio_sd.h. Why can it find stm32f10x.h but not stm32_eval_sdio_sd.h?

Finally, I'm getting to the point. This is what I want to talk about, how to set the include path in the C/C++ project settings tab.

The following is the current setup:

As can be seen from the above figure, we searched the User directory, and stm32f10x_it.h is stored in this directory, so it can be searched. However, I stored stm32_eval_sdio_sd.h in the STM32_EVAL directory, so the file could not be searched. So the solution is to add the STM32_EVAL path. When we compile again, we can see that the above prompt has been solved.

3. This leads to another question, which is still related to the project settings. Let’s continue.

Observe carefully, when compiling the file stm32f10x_it.c, it prompts UserSTM32_EVALstm32_eval.h cannot find stm3210e_eval/stm3210e_eval.h.

When compiling the main.c file, it prompts UserSTM32_EVALstm32_eval.h cannot find stm3210e_eval/stm3210e_eval.h.

The reason is that both files reference "stm32_eval_sdio_sd.h", and "stm32_eval_sdio_sd.h" references stm32_eval.h.

stm32_eval.h prompts that stm3210e_eval/stm3210e_eval.h cannot be found.

Why is this the case? We saw the following code in stm32_eval.h:

It means that relative to the file stm32_eval.h, go to the stm3210e_eval directory to find the file stm3210e_eval.h. Obviously, I don't have the path stm3210e_eval, because I put stm32103_eval.h and stm32_eval.h in the same path, both in the path STM32_EVAL. So, stm3210e_eval.h cannot be found.

Knowing the cause of the problem, you will also know how to solve it. 2 methods:

1. Create the UserSTM32_EVALstm3210e_eval path and store stm3210e_eval.h there. And add ..UserSTM32_EVALstm3210e_eval in the include path.

2. You can also modify the code to #include "stm3210e_eval.h".

I usually use the second method, which has a simpler directory structure.