Quality RTOS & Embedded Software

 Real time embedded FreeRTOS RSS feed 
Quick Start Supported MCUs PDF Books Trace Tools Ecosystem TCP & FAT




Loading

Type conflicts of xQueueHandle

Posted by barry bridges on March 12, 2009
Hi all,
Having a few probs with Queues at the moment, silly ones now doubt.

I'm running IAR version 4 with Sam7x256.
The problem i'm having is the compiler doesnt know what xQueueHandle is, theres two in the queue.c/.h.

one is "typedef xQUEUE * xQueueHandle;"
the other is "typedef void * xQueueHandle;"

and i get the following, plus others


Warning[w6]: Type conflict for external/entry "xQueueCreate", in module CanControl against external/entry in module queue; function return types are different; different basic types


Anyone got any ideas?


Many thanks

Barry

RE: Type conflicts of xQueueHandle

Posted by Richard on March 12, 2009
This is deliberate data hiding. The IAR compiler is just very pedantic. Turn the warning off.

Regards.

RE: Type conflicts of xQueueHandle

Posted by rpike on March 18, 2009
You can modify queue.c to eliminate the warning AND preserve the data hiding.

Change queue.c so that it #includes queue.h. Now all the queue functions use the same typedef that your client code does (xQueueHandle is void*).

Change the typedef in queue.c to something like:
typedef xQUEUE xRealQueueHandle;

Now change all of the functions in queue.c that take an xQueueHandle parameter or return an xQueueHandle and cast the void pointer to xRealQueueHandle.

-rp


[ Back to the top ]    [ About FreeRTOS ]    [ Sitemap ]    [ ]




Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.

Latest News

FreeRTOS kernel V10 is available for immediate download. Now MIT licensed.


FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

IAR Partner

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

STMicro RTOS partner supporting ARM7, ARM Cortex-M3, ARM Cortex-M4 and ARM Cortex-M0

Texas Instruments MCU Developer Network RTOS partner for ARM and MSP430 microcontrollers

OpenRTOS and SafeRTOS