How to use the PSRAM in 32L4R9IDISCOVERY for FrameBuffer?

[lmin.1]

How to use the PSRAM of 32L4R9IDISCOVERY as the LCD Framebuffer?

I have a evaluation board 32L4R9IDISCOVERY.

And use the Demo program as start: STM32Cube_FW_L4_V1.14.0\Projects\32L4R9IDISCOVERY\Examples\DSI\DSI_CmdMode_SingleBuffer.

and then, added the PSRAM init function in stm32l4r9i_discovery_psram.c.

The PSRAM worked well, and used as heap.

First I setted the FrameBUffer in ISRAM.

The code work well, and LCD display the LOGO.

After I setted the FrameBuffer to PSRAM.

//__attribute__((section(".FrameBufferSection")))

__attribute__((section(".XRAMSection")))

__align(16) uint32_t PhysFrameBuffer[91260]; // 5 char buffer, 5*16 = 80 pixer

The code jump to LTDC_ER_IRQHandler, after the function

 if(HAL_LTDC_ConfigLayer(&LtdcHandle, &LayerCfg, LTDC_LAYER_1) != HAL_OK)

 {

  return(LCD_ERROR);

 }

attch BSP init

static void k_BspInit(void)

{

 /* Configure IO expanders */

 BSP_IO_Init();

 /* Configure LED1 and LED2 */

 BSP_LED_Init(LED1);

 BSP_LED_Init(LED2);

/* PSRAM device configuration */ 

 if(BSP_PSRAM_Init() != PSRAM_OK)

 {

while(1);

}

 /* Initialize the NOR OctoSPI flash */

 if (BSP_OSPI_NOR_Init() != OSPI_NOR_OK)

 {

  /* Initialization Error */

  while(1);

 }

 else

 {

  if(BSP_OSPI_NOR_EnableMemoryMappedMode() != OSPI_NOR_OK)

  {

   /* Configuring Memory Mapped mode failed */

   while(1);

  }

 }

 /* Enable CRC to Unlock GUI */

// __HAL_RCC_CRC_CLK_ENABLE();

}

And the PSRAM init code:

  /* PSRAM device configuration */

  /* Timing configuration derived from system clock (up to 120Mhz)

  for 60Mhz as PSRAM clock frequency */

  Timing.AddressSetupTime   = 4;

  Timing.AddressHoldTime    = 2;

  Timing.DataSetupTime     = 6;

  Timing.BusTurnAroundDuration = 1;

  Timing.CLKDivision      = 2;

  Timing.DataLatency      = 2;

  Timing.AccessMode    = FMC_ACCESS_MODE_A; //FMC_ACCESS_MODE_A;

  psramHandle.Init.NSBank       = FMC_NORSRAM_BANK1;

  psramHandle.Init.DataAddressMux   = FMC_DATA_ADDRESS_MUX_DISABLE;

  psramHandle.Init.MemoryType     = FMC_MEMORY_TYPE_PSRAM;

  psramHandle.Init.MemoryDataWidth  = FMC_NORSRAM_MEM_BUS_WIDTH_16;

  psramHandle.Init.BurstAccessMode  = FMC_BURST_ACCESS_MODE_DISABLE;

  psramHandle.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_HIGH;

  psramHandle.Init.WaitSignalActive  = FMC_WAIT_TIMING_BEFORE_WS;

  psramHandle.Init.WriteOperation   = FMC_WRITE_OPERATION_ENABLE;

  psramHandle.Init.WaitSignal     = FMC_WAIT_SIGNAL_DISABLE;

  psramHandle.Init.ExtendedMode    = FMC_EXTENDED_MODE_DISABLE;

  psramHandle.Init.AsynchronousWait  = FMC_ASYNCHRONOUS_WAIT_DISABLE;

  psramHandle.Init.WriteBurst     = FMC_WRITE_BURST_DISABLE;

  psramHandle.Init.ContinuousClock  = FMC_CONTINUOUS_CLOCK_SYNC_ASYNC;

  psramHandle.Init.WriteFifo     = FMC_WRITE_FIFO_DISABLE;

  psramHandle.Init.NBLSetupTime    = 0;

  psramHandle.Init.PageSize      = FMC_PAGE_SIZE_NONE;

  psramHandle.Instance = FMC_NORSRAM_DEVICE;

  psramHandle.Extended = FMC_NORSRAM_EXTENDED_DEVICE;

And the Scatter file:

LR_IROM1 0x08000000 0x00200000 {  ; load region size_region

 ER_IROM1 0x08000000 0x00200000 { ; load address = execution address

  *.o (RESET, +First)

  *(InRoot$$Sections)

  .ANY (+RO)

 }

 RW_IRAM1 0x20000000 0xA0000 { ; RW data  

  .ANY (+RW +ZI)  

 }

 RW_SRAM1 0x20000000 0x30000 { ; RW data

  .ANY (+RW +ZI)  

 }  

 RW_SRAM2 0x10000000 0x10000 { ; RW data

 *(.FreeRTOSHeapSection)

 .ANY(STACK)

 }  

 RW_SRAM3 0x20040000 0x60000 { ; RW data

 .ANY(PHYS_FB)

 *(.FrameBufferSection)

 }   

 RW_XRAM 0x60000000 0x400000 {

 .ANY(HEAP)

 *(.XRAMSection)

 }

}​

Thanks.

[STrop]

Hello,

I have the same issue using the same setup (STM32L4R9I-Discovery, same screen, psram and software)

I Can confirm that my psram is well initialized however putting PhysFramesBuffer at PSRAM location crash the board (see stacktrace bellow )

Did you manage to make this setup work ?

I was wondering if it could be a timing issue between LTDC clock and FMC/PSRAM clock wich seem to be HCLIK /2 = 60MHz ?

STM32L4R9I-Discovery.elf [cores: 0]	
	Thread #1 [main] 1 [core: 0] (Suspended : Signal : SIGTRAP:Trace/breakpoint trap)	
		WWDG_IRQHandler() at startup_stm32l4r9xx.s:116 0x8005058	
		<signal handler called>() at 0xfffffff9	
		HAL_RCC_OscConfig() at stm32l4xx_hal_rcc.c:552 0x80033cc	
		HAL_DSI_MspInit() at stm32l4xx_hal_msp.c:136 0x8005f30	
		HAL_DSI_Init() at stm32l4xx_hal_dsi.c:341 0x8001dfc	
		LCD_Config() at main.c:477 0x800542e	
		main() at main.c:320 0x800542e	
		Reset_Handler() at startup_stm32l4r9xx.s:98 0x800503e	

Thanks

Simon

[waclawek.jan]

Debug as usually: what's at HAL_RCC_OscConfig() at stm32l4xx_hal_rcc.c:552 ? What makes it crashing there? Why is it called at all?

JW