STM32N6 initializing JPEG causes HardFault

[rphii]

Hi everyone

 

I have a bit trouble initializing the JPEG peripheral on the N6. See the stack trace:

 

 

I feel like this has something to do with the RIF? I don’t know, this chip is very new to me. If anyone can help me, it’d be greatly appreciated.

 

Best regards

[Saket_Om]

Hello ​@rphii 

Please refer to the article below to debug your Hardfault. 

How to debug a HardFault on an Arm® Cortex®-M STM32 | Community

[rphii]

Hi ​@Saket_Om 

 

Thanks for the suggestion, I will look into that. In the meantime, I tried to use the example ‘JPEG_EncodingFromOSPI_DMA’ and that also HardFaults at the same location… 

 

=> Which is because of my linker script, lol

[rphii]

Okay, so I essentially fixed the initialization issue.

 

The Problem

In my case, I added the JPEG code to an existing application that made use of the NPU via. generated files from STM32Cube AI Studio. To make use of that generated code, I had to expand my linker script with the provided one by the AI Studio; so I basically expanded my MEMORY region, to match that of the generated .ld file:

/* Memories definition */
MEMORY
{
	RAM (xrw)	: ORIGIN = 0x34000000, LENGTH = 0x100000
	AXISRAM3_4_5_6 (xrw)	: ORIGIN = 0x34270000, LENGTH = 0x0
	ROM (xrw)	: ORIGIN = 0x70100400, LENGTH = 0x6ffc00
	EXTFLASH (rx)	: ORIGIN = 0x70180000, LENGTH = 0x7e80000
}

/* Sections */
SECTIONS
{

	/* Add Memory Area for AXIFLEXMEM */
	.AI_AXIFLEXMEM (NOLOAD):
	{
	    . = ALIGN(4);
	    KEEP(*(.AI_AXIFLEXMEM))
	    . = ALIGN(4);
	} >RAM
	/* Add Memory Area for AXISRAM1 */
	.AI_AXISRAM1 (NOLOAD):
	{
	    . = ALIGN(4);
	    KEEP(*(.AI_AXISRAM1))
	    . = ALIGN(4);
	} >RAM
	/* Add Memory Area for xSPI2 */
	.AI_XSPI2 :
	{
	    . = ALIGN(4);
	    KEEP(*(.AI_XSPI2))
	    . = ALIGN(4);
	} >EXTFLASH
	/* Add Memory Area for EXTFLASH */
	.AI_EXTFLASH :
	{
	    . = ALIGN(4);
	    KEEP(*(.AI_EXTFLASH))
	    . = ALIGN(4);
	} >EXTFLASH

	/* ... the rest of the ld file ... */

The Fix

I didn’t see that the generated .ld file also increased the _Min_Heap_Size and _Min_Stack_Size, so I additionally updated those:

_Min_Heap_Size = 2048; /* required amount of heap */
_Min_Stack_Size = 8192; /* required amount of stack */