STM32F767ZI FMC and TruComponents 320x240 LCD with 8 bit parallel port

[EasyNet]

Hello all,

I'm facing an issue with STM32 CubeMX / CubeIDE firmware using this display with X-CUBE-DISPLAY over FMC.

Each time I'm trying to initialize the LCD this function  if((ILI9341_LCD_Driver.ReadID(LcdCompObj, &id) == ILI9341_OK) && (id == ILI9341_ID)) is always returns id = 0x0.

I've tried to play with timings, using formula from FMC/FSMC, but no luck.

This is my FMC initiliaztiation:

/* FMC initialization function */
static void MX_FMC_Init(void)
{

  /* USER CODE BEGIN FMC_Init 0 */

  /* USER CODE END FMC_Init 0 */

  FMC_NORSRAM_TimingTypeDef Timing = {0};

  /* USER CODE BEGIN FMC_Init 1 */
  // hsram1.Instance = FMC_Bank1_1;
  /* USER CODE END FMC_Init 1 */

  /** Perform the SRAM1 memory initialization sequence
  */
  hsram1.Instance = FMC_NORSRAM_DEVICE;
  hsram1.Extended = FMC_NORSRAM_EXTENDED_DEVICE;
  /* hsram1.Init */
  hsram1.Init.NSBank = FMC_NORSRAM_BANK1;
  hsram1.Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE;
  hsram1.Init.MemoryType = FMC_MEMORY_TYPE_SRAM;
  hsram1.Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_8;
  hsram1.Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
  hsram1.Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
  hsram1.Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
  hsram1.Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
  hsram1.Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
  hsram1.Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
  hsram1.Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
  hsram1.Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
  hsram1.Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
  hsram1.Init.WriteFifo = FMC_WRITE_FIFO_ENABLE;
  hsram1.Init.PageSize = FMC_PAGE_SIZE_NONE;
  /* Timing */
  Timing.AddressSetupTime = 2;
  Timing.AddressHoldTime = 15;
  Timing.DataSetupTime = 16;
  Timing.BusTurnAroundDuration = 2;
  Timing.CLKDivision = 16;
  Timing.DataLatency = 17;
  Timing.AccessMode = FMC_ACCESS_MODE_A;
  /* ExtTiming */

  if (HAL_SRAM_Init(&hsram1, &Timing, NULL) != HAL_OK)
  {
    Error_Handler( );
  }

  /* USER CODE BEGIN FMC_Init 2 */

  /* USER CODE END FMC_Init 2 */
}

My CPU is running at 216MHz and I've tried with these parameters:

DATASET	4
ADDSET	9

And nothing.

I've recheck the connections, I replaced the LCD with another one (both of them are working on F103 without FMC or on ATMEL).

Can somebody help me to fix this issue? 

Thanks.

[mƎALLEm · Accepted solution]

Hello,

STM32F103 and STM32F7 are quite different in term of architecture. 

For products with CM7 core (Ex: STM32F7) you need to take care about the cachability and the usage of the MPU.

You need to set the memory region for LCD as non cacheable: Strongly-ordered or Device.

AN4838 "Introduction to memory protection unit management on STM32 MCUs"

AN4839 "Level 1 cache on STM32F7 Series and STM32H7 Series"

I think that thread is the continuation of that one.

[EasyNet]

Thanks @mƎALLEm pointing me to these documents!

It worked when I set to MPU region 0 with 256MB size and Device:

1. TEX level 0 (000), C(cachable) -> Disabled, B (Bufferable) -> Enable, NX (Instruction Access I beleive) -> Disabled, Shareable -> Enable

2. TEX level 2 (010), C(cachable) -> Disabled, B (Bufferable) -> Disabled, NX (Instruction Access I beleive) -> Disabled, Shareable -> Disabled

Indeed is a continuation of that thread.