Quality RTOS & Embedded Software

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


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


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.


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.


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

Copyright (C) 2004-2010 Richard Barry. Copyright (C) 2010-2016 Real Time Engineers Ltd.
Any and all data, files, source code, html content and documentation included in the FreeRTOSTM distribution or available on this site are the exclusive property of Real Time Engineers Ltd.. See the files license.txt (included in the distribution) and this copyright notice for more information. FreeRTOSTM and FreeRTOS.orgTM are trade marks of Real Time Engineers Ltd.

Latest News:

FreeRTOS V9.0.0 is now available for download.

Free TCP/IP and file system demos for the RTOS

Sponsored Links

⇓ Now With No Code Size Limit! ⇓
⇑ Free Download Without Registering ⇑

FreeRTOS Partners

ARM Connected RTOS partner for all ARM microcontroller cores

Renesas Electronics Gold Alliance RTOS Partner.jpg

Microchip Premier RTOS Partner

RTOS partner of NXP for all NXP ARM microcontrollers

Atmel RTOS partner supporting ARM Cortex-M3 and AVR32 microcontrollers

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

Xilinx Microblaze and Zynq partner

Silicon Labs low power RTOS partner

Altera RTOS partner for Nios II and Cortex-A9 SoC

Freescale Alliance RTOS Member supporting ARM and ColdFire microcontrollers

Infineon ARM Cortex-M microcontrollers

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

Cypress RTOS partner supporting ARM Cortex-M3

Fujitsu RTOS partner supporting ARM Cortex-M3 and FM3

Microsemi (previously Actel) RTOS partner supporting ARM Cortex-M3

Atollic Partner

IAR Partner

Keil ARM Partner

Embedded Artists