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Animated image issue on custom board with 5' TFT

SKokk.1
Associate II

Hello,

i used the STM32CubeIDE Version: 1.1.0 with TouchGFX designer 4.12.3 to build a project for the F746G-Disco. Everything worked fine, i was able to display animations etc.

Then, i made the changes to my custom board (based on Disco schematics) to use a 5 Inches (800x480) TFT and i was able to display some boxes/images but when i tried to display some animated images, the animation was not working (seems frozen).

The Touch panel is not configured yet, due to different driver than Disco.

Could this be a hardware issue? I am attaching the screen datasheet and the project, in case someone could help.

Project:

https://drive.google.com/file/d/1ibuGvqsCGqzeZYnflSGMnCdHznQdUkfN/view?usp=sharing

Small video:

https://www.youtube.com/watch?v=aE4VB7f4UFw

27 REPLIES 27
SKokk.1
Associate II

STM32F746NGHX_FLASH.ld (with changes made for QSPI):

/*
******************************************************************************
**
**  File        : LinkerScript.ld
**
**  Author		: Auto-generated by STM32CubeIDE
**
**  Abstract    : Linker script for STM32F746G-DISCO Board embedding STM32F746NGHx Device from STM32F7 series
**                      1024Kbytes FLASH
**                      320Kbytes 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
**
** <h2><center>&copy; COPYRIGHT(c) 2020 STMicroelectronics</center></h2>
**
** Redistribution and use in source and binary forms, with or without modification,
** are permitted provided that the following conditions are met:
**   1. Redistributions of source code must retain the above copyright notice,
**      this list of conditions and the following disclaimer.
**   2. Redistributions in binary form must reproduce the above copyright notice,
**      this list of conditions and the following disclaimer in the documentation
**      and/or other materials provided with the distribution.
**   3. Neither the name of STMicroelectronics nor the names of its contributors
**      may be used to endorse or promote products derived from this software
**      without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************************
*/
 
/* 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 = 0x200 ;	/* required amount of heap  */
_Min_Stack_Size = 0x400 ;	/* required amount of stack */
 
/* Memories definition */
MEMORY
{
  RAM	(xrw)	: ORIGIN = 0x20000000,	LENGTH = 320K
  FLASH	(rx)	: ORIGIN = 0x8000000,	LENGTH = 1024K
  QUADSPI (rx)	: ORIGIN = 0x90000000,	LENGTH = 16M 
}
 
/* 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   : { 
    . = ALIGN(4);
    *(.ARM.extab* .gnu.linkonce.armextab.*)
    . = ALIGN(4);
  } >FLASH
  
  .ARM : {
    . = ALIGN(4);
    __exidx_start = .;
    *(.ARM.exidx*)
    __exidx_end = .;
    . = ALIGN(4);
  } >FLASH
 
  .preinit_array     :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array*))
    PROVIDE_HIDDEN (__preinit_array_end = .);
    . = ALIGN(4);
  } >FLASH
  
  .init_array :
  {
    . = ALIGN(4);
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array*))
    PROVIDE_HIDDEN (__init_array_end = .);
    . = ALIGN(4);
  } >FLASH
  
  .fini_array :
  {
    . = 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 */
 
    . = 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) }
  
  ExtFlashSection :
  {
  	*(ExtFlashSection ExtFlashSection.*)
  	*(.gnu.linkonce.r.*)
  	. = ALIGN(0x04);
  } >QUADSPI
  
  FontFlashSection :
  {
  	*(FontFlashSection FontFlashSection.*)
  	*(.gnu.linkonce.r.*)
  	. = ALIGN(0x04);
  } >QUADSPI
  
  TextFlashSection :
  {
  	*(TextFlashSection TextFlashSection.*)
  	*(.gnu.linkonce.r.*)
  	. = ALIGN(0x04);
  } >QUADSPI  
}

SKokk.1
Associate II

Back with available logic analyzer...

Do you see the LTDC interrupt getting fired: LTDC_IRQHandler -> HAL_LTDC_LineEvenCallback()?

It enters only 2 times

0693W000001poBPQAY.png

  And codes stucks at:

 0693W000001poNfQAI.png

I would look into the LTDC and DMA2D registers and see if something is wrong.

Another possible cause: GUI task stack size but it is hard to tell if this is your case.

I don't think you would need that as you are running your code from the internal flash and your linker command by default uses STM32F746NGHX_FLASH.ld

SKokk.1
Associate II

I dont know what else to check...

 I am afraid that with a display 800x480 you would need a 32-bit  

  hsdram1.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_16;

You can dump the LTDC/DMA2D registers to tell what's going on.

You can as well slow down the pixel clock to the lowest possible value. Not sure what the actual value is.

AN4861 table 12 says that with SVGA and 24bit you would need 32-bit SDRAM:

https://www.st.com/resource/en/application_note/dm00287603-lcdtft-display-controller-ltdc-on-stm32-mcus-stmicroelectronics.pdf

With regards,

Badreddine

  

  

Thank you Badreddine,

16bpp might be enough for our application.

Adding a 32-bit SDRAM is not a choice cause we will need to re-design the whole PCB (with 16bit SDRAM and only 4 pins left free).

Thank you all.

Anytime!