Problem with running STemWin in STM32F103ZET from external SRAM

[Ahaji.1]

Hi everyone

I'm using stm32f103zet to run emwin gui. In the first step i configured everything for running from internal RAM and program worked fine and gui is displays components like progress bar and ...., but when i changed linker command file to map gui memory to external SRAM everything went wrong. I checked connection with SRAM and it was ok. I checked 8,16,32 bit memory accessing integrity by following code:

this code is running well

build analyzer tool of cubeide shows memory usage as follows:

in this case program run GUI_Init() function successfully and memory allocation and LCD initialization are done, (The LCD is turn to black after GUI_Init() Execution just like when i use the internal RAM as gui memory) but nothing else happens.

What is the problem?

Thank you so much

[Tesla DeLorean]

>>..STM32F103ZET .. external SDRAM

This would surprise me, I'm pretty sure the F1 series does not support SDRAM, sure it is not just a Static RAM?

>>this code is running well

The real trick is to be able to read back the content

>>What is the problem?

Hard to know without actually doing some debugging.

Is the content being initialized? Is there a hard fault?

Where does the code go in the "nothing happening" path. Perhaps output telemetry via a USART or SWO/SWV channel

[Ahaji.1]

>>..This would surprise me, I'm pretty sure the F1 series does not support SDRAM, sure it is not just a Static RAM?

Yes, Sorry, You are right, it is a SRAM (not SDRAM)

>>..The real trick is to be able to read back the content

yes, I checked that through this code:

int main()
{
// some codes
 
	uint8_t  static Var8[1000]__attribute__((section(".GUI_RAM")));
	uint16_t static Var16[1000]__attribute__((section(".GUI_RAM")));
	uint32_t static Var32[1000]__attribute__((section(".GUI_RAM")));
 
	uint8_t   Read8[1000];
	uint16_t  Read16[1000];
	uint32_t  Read32[1000];
 
// other codes 
 
	for(ii=0;ii<1000;ii++)
	{
		Var8[ii]=ii;
		Var16[ii]=ii;
		Var32[ii]=ii;
	}
 
	for(ii=0;ii<1000;ii++)
	{
		Read8[ii]  = Var8[ii];
		Read16[ii] = Var16[ii];
		Read32[ii] = Var32[ii];
	}
 
// break point here
  
// codes ... 
}

I could read back the all content of the Var8,Var16 and Var32. as follows:

>>..Is the content being initialized?

Content of what?

>>.. Is there a hard fault?

No, program continues to execution as normal but nothing displays on the screen

>>..Where does the code go in the "nothing happening" path

program is in the while loop as follows:

I placed break point inside the while(1) to making sure that program is running.

By the way, the same code runs very well with internal RAM.

Thanks

Ali.H