Hi,

It seems the problem is that main.h is included by stm32f7xx_hal_conf.h, itself included by stm32f7xx_hal.h (see the error message above) and that it includes stm32f769i_discovery.h which needs types that are defined by (possibly indirectly) by stm32f7xx_hal.h but after it includes main.h (which is probably expected to parameterize it).

So in main in the first case include files are:

• stm32f7xx_hal.h
  • stm32f7xx_hal_conf.h
    • main.h
• stm32f769i_discovery.h

so when this last file was included, stm32f7xx_hal.h was fully parsed and all works well, while in the second case include files are:

• stm32f7xx_hal.h
  • stm32f7xx_hal_conf.h
    • main.h
      • stm32f769i_discovery.h

and it does not work because, when stm32f769i_discovery.h is included, stm32f7xx_hal.h and stm32f7xx_hal_conf.h are not yet fully included...

There’s no simple cure for that as multiple-inclusion prevention will not permit to include stm32f7xx_hal.h from main.h (it will be skipped as you are already in the process of including it, altough not yet fully). The best would be to place all your application-specific include files in a new include file (say app.h) containing, for example

#ifndef __APP_H
#define __APP_H

#include "stm32f7xx_hal.h"
#include "cmsis_os.h"
#include "stm32f769i_discovery.h"
#include "stm32f769i_discovery_lcd.h"
#include "stm32f769i_discovery_sdram.h"
#include "stm32f769i_discovery_ts.h"

#endif /* __APP_H */

and just have in main.c

#include "stm32f7xx_hal.h"
#include "cmsis_os.h"
#include "main.h"

/* USER CODE BEGIN Includes main.c*/
#include "app.h"
/* USER CODE END Includes */

while main.h is left untouched (that is without any user includes).

Hope this helps,

Bernard (Ac6)

PS: To format code just place it between {CODE()} and {CODE}