Using FontFlashSection in QSPI Flash Memory

[Gökhan]

Hello,

I've created a test touchGFX project for stm32h747i-disco by using TouchGFX Designer-4.21.4. It has only one screen that has one background image and one text. You can see it below:

When I generate the code by using TouchGFX Designer-4.21.4 and when I compile and download it with stm32CubeIDE, it works without any problem. 

But when I write this linker code to move FontFlashSection into QSPI flash memory, it stucks in the ErrorHandler.

 

FontFlashSection :
{
	*(FontFlashSection FontFlashSection.*)
	*(.gnu.linkonce.r.*)
 . = ALIGN(0x4);
} >QSPI

 

ExtFlashSection, FontSearchFlashSection and TextFlashSection work in the QSPI flash memory without any problem. But when I add FontFlashSection as well to the QSPI Flash, the code somehow stucks in the ErrorHandler. 

 

What else should I do to use FontFlashSection in QSPI Flash memory? What am I missing? Can you help me for this? I need to use FontFlashSection in the QSPI Flash memory. Thank you for the answers :)

[Gökhan]

Do you have any suggestion for this?

[Tesla DeLorean]

Not sure

If you can track down what's calling Error_Handler() it might shed some light on the issue.

HardFault_Handler() might occur if the memory isn't properly mapped when data is copied out of it.

Perhaps there are some DISCO/EVAL examples using the fonts, and you might be able to check the linker scripts there, or the ELF file construction.

The H747I-DISCO should have it's External Loader, so the data should be in memory successfully.

[Gökhan]

Thank you for the answer. I tracked down in the code. After the function being called below, it goes to the ErrorHandler.

const uint8_t* GeneratedFont::getPixelData(const GlyphNode* glyph) const
{
 const uint8_t* const* table = (const uint8_t* const*)glyphData;
 return &(table[glyph->unicode / 2048][glyph->dataOffset]);
}

Also, I have checked some of the TouchGFX examples for the stm32h747i-disco. Unfortunately, FontFlashSection is being used in internal flash memory in these examples.

 

 

[MM..1]

Seems long problem based on somethink in lib and adressing in memory. Read FontFlashSection in memory mapped SDRAM - STMicroelectronics Community

And if your font info is short try store it in QSPI, but load into some RAM unused segment for example ITCM in linker script...

[Gökhan]

It works!!! Thank you so much :)

[karsparskambala]

Hi, this topic helped a lot. Thanks to both of you. I am trying to integrate TouchGFX into Zephyr and am having problems with the fonts. Do you have any idea what might be the reason?