Hello, everyone.
I have a problem on which I am seeking advice and opinions for a possible solution.
I am making an application with the STM32H7S78-dk board and TouchGFX. A very simple thing, imagine a page with a background image and a button, same for page 2. By pressing a button I move between pages.
What I want to do is read an image from the SD card (I have already managed to configure reading and writing a file correctly) and display it on the screen on one of the two pages, let's take page 2 as an example.
I have almost succeeded but with some basic problems.
My method was to have TouchGFX allocate an image of the size I wanted in the External Flash and through this code in the image.cpp file change its location.
LOCATION_PRAGMA(‘MyImage’) //RAM
KEEP extern unsigned char image_saname[] LOCATION_ATTRIBUTE(‘MyImage’) = { ...
Where this area called MyImage that has been allocated in the external RAM section in the LD file like this:
BufferSection(NOLOAD) :
{
*(TouchGFX_Framebuffer TouchGFX_Framebuffer.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x8);
*(Nemagfx_Stencil_Buffer Nemagfx_Stencil_Buffer.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x8);
*(MyImage MyImage.*)
*(.gnu.linkonce.r.*)
. = ALIGN(0x8);
} >EXTRAM
Having done this within the task that regulates the SD card, I went to read bit by bit of my 565 bitmap image on the SD card and overwritten the image created by TouchGFX.
This works because I can see this image on the page I'm interested in but after a bit of switching between pages by pressing the buttons I get a HardFault_Handler() back.
I can't figure out if there is a problem because TouchGFX doesn't know that that image is actually in the external RAM so that every time the page is reloaded it doesn't clean the memory correctly.
Or I can't tell if it's a task conflict problem
Thanks
