Hi,

i was trying to use the vTaskDelayUntil task in one task. but compiler throwing some error's. error as:

freeRTOS ConfigurationfreeRTOS Configuration.axf: Error: L6218E: Undefined symbol vTaskDelayUntil (referred from main.o). Not enough information to list image symbols. Finished: 1 information, 0 warning and 1 error messages.

I checked vTaskDelay is working but if i use vTaskDelayuntil then compiler start throwing errors.

i m using Keil compiler.

have you set INCLUDE_vTaskDelayUntil to 1 in FreeRTOSConfig.h?

Thanks, i was not aware of this.

Thanks, i was not aware of this.

vTaskDelayUntil() is implemented in FreeRTOS/Source/tasks.c (that is what the 'Task' in the function name means). You can search for the function in that file to see that it has a dependency on INCLUDE_vTaskDelayUntil.

Pre-processor symbols that remove entire functions are generally a waste of space anyway, as most linkers will automatically remove functions that are not referenced. The only toolchain I know that doesn't do that by default is GCC - but most people (and GCC vendors) that use GCC manually set the compiler options to remove dead code.