ESP32 Forum

Posted: **Thu May 14, 2020 2:51 pm**

Hi everyone,

I'm new here - not totally new, I've done project with ESP32 on Arduino IDE but now I'm trying to re-factor everything with ESP-IDF and it requires knowledge in different fields I didn't know (e.g CMake).

Now I have a issue with struct in C. I cannot pass the struct which I have defined in [main.h] and used in [main.c] call from another file in [component/sensor.c].

Please help me!!! Here is the example of my project:

[tree of my project]

Code: Select all

project:
 - CMakeList.txt
 - component.mk
 - main:
     - main.h
     - main.c 
 - component:
     - CMakeList.txt
     - component.mk
     - sensor.c
     - include:
         - sensor.h

[main.h]

Code: Select all

 
  typedef struct ax
{
uint8_t a;
uint16_t b;
float x;
}ax;
 
 ax ax_ms[500];

[sensor.h]

Code: Select all

#include "main.h"

void ex_func(uint8_t x, ax *ax_ms);

[sensor.c]

Code: Select all

#include "sensor.h"
void ex_func(uint8_t x, ax *ax_ms)
{
   doing something;
}

[main.c]

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#include "main.h"

ex_func( x, &ax_ms );

[CMakeList.txt - project folder]

Code: Select all

include($ENV{IDF_PATH}/tools/cmake/project.cmake)
project(example)

[component.mk - project folder]

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COMPONENT_ADD_INCLUDEDIRS := components/include 
COMPONENT_SRCDIRS := components

[CMakeList.txt - component folder]

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set(COMPONENT_ADD_INCLUDEDIRS include ../main)
set(COMPONENT_SRCS "sensor.c")

register_component()

[component.mk - component folder]

Code: Select all

COMPONENT_ADD_INCLUDEDIRS := include ../main

When I run "build", I always get the error message "unknown type name `ax `".
Btw, I use Eclipse with ESP-IDF on Windows10.

Thanks

Posted: **Fri May 15, 2020 7:30 am**

I got it work...

I defined the struct in [sensor.h] and initialize the struct array in [main.c].

Besides that I change the way defined struct from

typedef struct ax{
...
};

to be

typedef struct{
...
}ax;

ESP32 Forum

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