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malloc for a pointer.

Posted by Nobody/Anonymous on December 10, 2005
Hello,
I am debugging an application who run on FreeRTOS ported on ADuC7026, using Heap_2 as memory management.(Using KEIL Debugger)
I allocate memory for a pointer:
uint8 *mem_to_send = PanicNull(prvPortMalloc(sizeof(uint8)));
So the allocated memory will be on the Heap.

My Problem is that the debugger signalize a Address violation error:
*** error 65: access violation at 0x00000000 : no 'write' permission
when he execute the instruction :
mem_to_send[0]=0xC0;
so that it seam like my pointer is not initialized
Please can you explain me what is going on ? Generally, how to allocate memory to someting other than a task.
Best regards;
Emeric

RE: malloc for a pointer.

Posted by Nobody/Anonymous on December 10, 2005
I presume PanicNull() will tell you if the pointer is NULL.

Check that portBYTE_ALIGNMENT is set correctly in your port (ADu is not official port?).

You say you are allocating memory for a pointer, but use sizeof( uint8), which is presumably 8bits. Most likely a pointer is 32bits. Should this be (uint8*).

RE: malloc for a pointer.

Posted by Nobody/Anonymous on December 11, 2005
portBYTE_ALIGNMENT is set to 4. I thing this is normal. You are wrigth, i have to use (uint8*).
I ported Aduc using LPC2106 as starting point. The only thing i have changed are the timers and interrupt service routine which are specific to ADUC.

I donĀ“t really know where my problem com from.

Any ideas?
best regards


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