unknown type name '__RAM_FUNC'; did you mean '__ARM_FP'?

[DNeet.1]

I trying to port STM32CubeExpansion_LRWAN_V1.3.1 for the evaluation board B-L475E-IOT01A2. I managed to whittle the errors down to 2. In both cases i am getting

unknown type name '__RAM_FUNC'; did you mean '__ARM_FP'?

in a HAL file stm32l4xx_hal_flash_ramfunc.h generated by STM32CubeIDE. What does this error mean?

The crazy thing is that __RAM_FUNC gets defined in stm32l4xx_hal_def.h, and stm32l4xx_hal_def.h is included in stm32l4xx_hal_flash_ramfunc.h, but somehow the compiler fails to register this??

#if defined ( __CC_ARM  ) || (defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050))

/* ARM Compiler V4/V5 and V6

  --------------------------

  RAM functions are defined using the toolchain options.

  Functions that are executed in RAM should reside in a separate source module.

  Using the 'Options for File' dialog you can simply change the 'Code / Const'

  area of a module to a memory space in physical RAM.

  Available memory areas are declared in the 'Target' tab of the 'Options for Target'

  dialog.

*/

#define __RAM_FUNC

#elif defined ( __ICCARM__ )

/* ICCARM Compiler

  ---------------

  RAM functions are defined using a specific toolchain keyword "__ramfunc".

*/

#define __RAM_FUNC __ramfunc

#elif defined  ( __GNUC__ )

/* GNU Compiler

  ------------

 RAM functions are defined using a specific toolchain attribute

  "__attribute__((section(".RamFunc")))".

*/

#define __RAM_FUNC __attribute__((section(".RamFunc")))

#endif

[Ozone · Accepted solution]

> The crazy thing is that __RAM_FUNC gets defined in stm32l4xx_hal_def.h, and stm32l4xx_hal_def.h is included in stm32l4xx_hal_flash_ramfunc.h, but somehow the compiler fails to register this??

Not necessarily.

There is no un-conditional # else branch, if your toolchain does not support it (falls into one of the # if / # elif branches), it remains undefined.

For a start, you could conditionally define it to nothing (like the __CC_ARM branch), and drop the RAM function feature.

It is rarely a functional requirement, often only for performance.

[DNeet.1]

Thanks, I will try that. For now I just deleted the code which caused the bugs, however it keeps being regenerated by the IDE

[Imen.D]

Hi @DNeet.1​ ,

Please mark the post as a Best Answer if it solved your problem, so that this thread will be marked as solved

Imen