HI, I'm not sure if doing this is OK, possible or downright dumb. (or all 3) I want to build FreeRTOS into a static library such that I can call it from a C++ application in IAR/EWARM. Besides the FreeRTOS files I usually set up in EWARM, what else is required? I set up an EWARM project and included all the source C files, the heap2.c, portasm.s, and port.c (from the FreeRTOSV8.2.0FreeRTOSSourceportableIARARM_CM4F directory) so there are 9 files. It builds OK into a lib file (.a) and I can add it into my C++ project. The FreeRTOS headers are enclosed in the C++ file as:

.#ifdef __cplusplus extern "C" { .#endif
.#include "FreeRTOS.h" .#include "task.h" .#include "semphr.h"
.#ifdef __cplusplus } .#endif

On build, I am getting an error that is telling me applicationTickHook isn't defined, but the function is in my C++ file. *Error[Li005]: no definition for "vApplicationTickHook" [referenced from tasks.o(FreeRTOSLIB.a)] *

When I build the static lib, do I need a "main.c" file with applicationTickHook included in there? Or, if not, what am I missing?

Thanks, Gary

Try placing the "vApplicationTickHook" prototype in an extern "C" block as it is called from C code.

Well, that makes perfect sense (after the fact) and it works. Now that I've done that, I can see the other C calls needing to be set up this way.

Thanks!

All seemed to have gone well, until I uncommented the call to start the scheduler. Now I am getting this error:

Error[Li005]: no definition for "vPortEnableVFP" [referenced from port.o(FreeRTOSLIB.a)] Error[Li005]: no definition for "vPortStartFirstTask" [referenced from port.o(FreeRTOSLIB.a)]

This one I cannot see, because I do not know where these functions exist. I should mention that I am using Richard Damon's C++ wrapper, but this shouldn't make any difference as it seems to create the task OK - from his TaskCPP.h file:

Task taskTCB("Task", taskfun, TaskPrioLow, configMINIMALSTACK_SIZE); void taskfun( void *parm ) { while(1) { vTaskDelay(1); printf("having funn"); } }

Any suggestions as to what the linker errors are caused by?

Thanks again, always appreciate the great help on thios forum. Gary

In the IAR port both vPortEnableVFP() and vPortStartFirstTask() are called from a C file (port.c), but implemented in an asm file (portasm.s). Their prototypes are in the C file, not in a header file, so I'm guessing you need to add extern "C" around their prototypes too. Currently the prototypes appear in the C file as:

/*
  * Start first task is a separate function so it can be tested in 
isolation.
  */
extern void vPortStartFirstTask( void );

/*
  * Turn the VFP on.
  */
extern void vPortEnableVFP( void );