FreeRTOS Support Archive
The FreeRTOS support forum is used to obtain active support directly from Real
Time Engineers Ltd. In return for using our top quality software and services for
free, we request you play fair and do your bit to help others too! Sign up
to receive notifications of new support topics then help where you can.
This is a read only archive of threads posted to the FreeRTOS support forum.
The archive is updated every week, so will not always contain the very latest posts.
Use these archive pages to search previous posts. Use the Live FreeRTOS Forum
link to reply to a post, or start a new support thread.
[FreeRTOS Home] [Live FreeRTOS Forum] [FAQ] [Archive Top] [May 2016 Threads]
Hello,
I am experiencing failure with malloc() function. Details of the target system is given as below:
MCU: LPC1788FBD208
OS: FreeRTOS
SDRAM: MT48LC4M16A2
Original Evaluation Kit: UEZGUI-1788-70WVT
Sample Project: uEZv2.06SourceForge
I am using the heap_3.c module. Function malloc() is dead at first time when it is called, requiring
76 bytes to be allocated. When I check the configuration of the heap size, it is far bigger than
the required size. Could you technical support guys help identify the problem? Thanks in advance.
heap_3 code
~~~
void *pvPortMalloc( size_t xWantedSize )
{
void *pvReturn;
vTaskSuspendAll();
{
pvReturn = malloc(xWantedSize );
}
xTaskResumeAll();
if( configUSEMALLOCFAILED_HOOK == 1 )
{
if( pvReturn == NULL )
{
extern void vApplicationMallocFailedHook( void );
vApplicationMallocFailedHook();
}
}
endif
return pvReturn;
}
~~~
Heap Size defined in FreeRTOSConfig.h
~~~
ifndef configMINIMALSTACKSIZE
define configMINIMALSTACKSIZE ( 128 )
endif
ifndef configTOTALHEAPSIZE
define configTOTALHEAPSIZE ( ( size_t ) (( 32 * 1024 ) - 64))
endif
~~~
I have tried to increase the heap size up to 48k and reduce the heap size to 20k.
The malloc dead lock keeps the same. There is no improvement.
Sample Project: uEZv2.06SourceForge
That is not a demo we provide ourselves (I don't think?), and as it seems to be a SourceForge project (guessing from FDI) then they will have a support forum too.
I am using the heap_3.c module. Function malloc() is dead at first time when it
is called, requiring 76 bytes to be allocated. When I check the configuration of
the heap size, it is far bigger than the required size. Could you technical support
guys help identify the problem? Thanks in advance.
If you are using heap3 then FreeRTOS is not providing the heap implementation, it is simply wrapping the calls to malloc() to make them thread safe. The heap is provided by your C run time environment, and configTOTALHEAP_SIZE is not being used. See http://www.freertos.org/a00111.html for more information.
Regards.
Copyright (C) Amazon Web Services, Inc. or its affiliates. All rights reserved.