STM32H7 FMC + ST7789 LCD

[baycanakcay]

Hi,
I am trying to interface Stm32h745 controller with a 240x320 TFT LCD over FMC. Interesting thing is, when I manually control lcd control and data pins(Set them as GPIO_OUTPUT_PP), Lcd works, but when I switched to FMC it does not. Tried lots of timing configuration but it did not help.
Here is the init for FMC

      .Instance = FMC_NORSRAM_DEVICE;
      .Extended = FMC_NORSRAM_EXTENDED_DEVICE;
      .Init.NSBank = FMC_NORSRAM_BANK1;
      .Init.DataAddressMux = FMC_DATA_ADDRESS_MUX_DISABLE;
      .Init.MemoryType = FMC_MEMORY_TYPE_SRAM;
      .Init.MemoryDataWidth = FMC_NORSRAM_MEM_BUS_WIDTH_8;
      .Init.BurstAccessMode = FMC_BURST_ACCESS_MODE_DISABLE;
      .Init.WaitSignalPolarity = FMC_WAIT_SIGNAL_POLARITY_LOW;
      .Init.WaitSignalActive = FMC_WAIT_TIMING_BEFORE_WS;
      .Init.WriteOperation = FMC_WRITE_OPERATION_ENABLE;
      .Init.WaitSignal = FMC_WAIT_SIGNAL_DISABLE;
      .Init.ExtendedMode = FMC_EXTENDED_MODE_DISABLE;
      .Init.AsynchronousWait = FMC_ASYNCHRONOUS_WAIT_DISABLE;
      .Init.WriteBurst = FMC_WRITE_BURST_DISABLE;
      .Init.ContinuousClock = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
      .Init.WriteFifo = FMC_WRITE_FIFO_DISABLE;
      instance->deviceHandleAsRam.Init.PageSize = FMC_PAGE_SIZE_NONE;

      FMC_NORSRAM_TimingTypeDef Timing = {0};
      Timing.AddressSetupTime      = 15;   // 1 cycle = 16.67 ns
      Timing.AddressHoldTime       = 15;   // 1 cycle hold time
      Timing.DataSetupTime         = 255;   // 4 cycles ≈ 66.7 ns
      Timing.BusTurnAroundDuration = 15;
      Timing.CLKDivision           = 16;   // Unused in SRAM mode
      Timing.DataLatency           = 17;   // Not used in mode A
      Timing.AccessMode            = FMC_ACCESS_MODE_A;
      
      instance->deviceTiming = Timing;

Tried FMC peripheral clk from 240 Mhz down to 15Mhz
LCD command/data selection connected to A0, and I am bank swapping from0x60000000 to 0xC0000000

#define LCD_BASE_ADDRESS     ((uint32_t)0xC0000000)

#define Lcd_CmdWrite(cmd)	  *((__IO uint8_t*)LCD_BASE_ADDRESS) = cmd
#define Lcd_DataWrite(data)  *((__IO uint8_t*)((LCD_BASE_ADDRESS) + (1 << (0 + 1)))) = data

 Here is the Logic Analyzer screen for 160Mhz Fmc Clock for the sequence below

   Lcd_CmdWrite(0xFF);    

   Lcd_DataWrite(0x00);

   Lcd_CmdWrite(0xAA);    

   Lcd_DataWrite(0x55);

 And here is the same saquence output with manual GPIO Control

Thanks for any help