Dear All,
I am working on a project based on the STM32U5G9NJH6Q MCU.
I have made a project using CubeMX v6.14. I am working on CubeIDE and I am using TouchGFX 4.25.0 for the GUI of my application.
I have used the STM32U5G9-DK2 to verify my GUI design, using hardware accelerated vector fonts. On the DK everything seems to be working fine.
But on the custom PCB I am working on, I see this:
The larger font on the screen is a vector font, whereas the smaller fonts are bitmap, so I am using a mix of the 2.
If I do not use hardware accelerated vectors (use software accelerated vectors instead) then the problem disappears, but the GUI is slow. My linker script looks like this:
/*
******************************************************************************
**
** @file : LinkerScript.ld
**
** @author : Auto-generated by STM32CubeIDE
**
** @brief : Linker script for STM32U5G9NJHxQ Device from STM32U5 series
** 4096KBytes FLASH
** 3008KBytes RAM
**
** Set heap size, stack size and stack location according
** to application requirements.
**
** Set memory bank area and size if external memory is used
**
** Target : STMicroelectronics STM32
**
** Distribution: The file is distributed as is, without any warranty
** of any kind.
**
******************************************************************************
** @attention
**
** Copyright (c) 2025 STMicroelectronics.
** All rights reserved.
**
** This software is licensed under terms that can be found in the LICENSE file
** in the root directory of this software component.
** If no LICENSE file comes with this software, it is provided AS-IS.
**
******************************************************************************
*/
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM) + LENGTH(RAM); /* end of "RAM" Ram type memory */
_Min_Heap_Size = 0x1000; /* required amount of heap */
_Min_Stack_Size = 0x1000; /* required amount of stack */
/* Memories definition */
MEMORY
{
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 3008K
FLASH (rx) : ORIGIN = 0x08028000, LENGTH = 3880K /* Τhe first 160kBytes are allocated for the BL and the last 7 pages (56kB) are reserved for data storage */
QUADSPI (rx) : ORIGIN = 0x90000000, LENGTH = 16320K
QUADSPI_NVM_BACKUP (rx) : ORIGIN = 0x90FF0000, LENGTH = 32K /* Backup QSPI NVM sector */
QUADSPI_28K (rx) : ORIGIN = 0x90FF8000, LENGTH = 28K /* last sector */
QUADSPI_LP (rx) : ORIGIN = 0x90FFF000, LENGTH = 4K /* last sub-sector */
}
/* Sections */
SECTIONS
{
/* The startup code into "FLASH" Rom type memory */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >FLASH
/* The program code and other data into "FLASH" Rom type memory */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >FLASH
/* Constant data into "FLASH" Rom type memory */
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >FLASH
.ARM.extab (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(4);
} >FLASH
.ARM (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(4);
} >FLASH
.preinit_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
} >FLASH
.init_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
} >FLASH
.fini_array (READONLY) : /* The "READONLY" keyword is only supported in GCC11 and later, remove it if using GCC10 or earlier. */
{
. = ALIGN(4);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
} >FLASH
/* Used by the startup to initialize data */
_sidata = LOADADDR(.data);
/* Initialized data sections into "RAM" Ram type memory */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
*(.RamFunc) /* .RamFunc sections */
*(.RamFunc*) /* .RamFunc* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> FLASH
/* Uninitialized data section into "RAM" Ram type memory */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss section */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >RAM
/* User_heap_stack section, used to check that there is enough "RAM" Ram type memory left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM
/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
FramebufferSection (NOLOAD) :
{
*(TouchGFX_Framebuffer TouchGFX_Framebuffer.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
*(Nemagfx_Stencil_Buffer Nemagfx_Stencil_Buffer.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
*(Nemagfx_Memory_Pool_Buffer Nemagfx_Memory_Pool_Buffer.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x4);
} >RAM
ExtFlashSection :
{
*(ExtFlashSection ExtFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x04);
} >QUADSPI
FontFlashSection :
{
*(FontFlashSection FontFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x04);
} >FLASH
TextFlashSection :
{
*(TextFlashSection TextFlashSection.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x04);
} >FLASH
.const_data :
{
KEEP(*(.const_data)) ;
} >QUADSPI_LP
.flag :
{
KEEP(*(.flag)) ;
}>QUADSPI_LP
}
Despite the naming of the external flash (QUADSPI) I am using a HyperBus Infineon Flash that is connected on OCTOSPI1 of the device, running at 104MHz. Another difference of my hardware and the DK is that I am using a 16bit LTDC, while the DK has a 24bit LTDC.
Any ideas as to what might be causing the issue that I am observing?
Thanks a lot in advance.
Hello @IAnastasopoulos and welcome to the community;
First of all I apologize for my late reply.
Could you please try to decrease the OCTOSPI clock frequency.
The max OCTOSPI clock frequency for STM32U5G is 100 MHz
I hope this help you.
Thank you.
Kaouthar
