Help with porting FMC from STM32L4 app to STM32U5

BDELI.2 · ‎2022-03-16

Hi, I'm trying to port my code that uses the FMC to interface a LCD display. The provided configuration works on the STM32L476, but when I port it to the STM32U585 the image is offseted to the right on the display.

Main clock (and FMC clock so) are configured to the same frequency.

Can you help me finding what is the source of the problem ?

L4 code:

        FMC_Handle.Instance                  = FMC_NORSRAM_DEVICE;
        FMC_Handle.Extended                  = FMC_NORSRAM_EXTENDED_DEVICE;
        // FMC_Handle.Init
        FMC_Handle.Init.NSBank               = FMC_NORSRAM_BANK1;
        FMC_Handle.Init.DataAddressMux       = FMC_DATA_ADDRESS_MUX_DISABLE;
        FMC_Handle.Init.MemoryType           = FMC_MEMORY_TYPE_SRAM;
        FMC_Handle.Init.MemoryDataWidth      = FMC_NORSRAM_MEM_BUS_WIDTH_8;
        FMC_Handle.Init.BurstAccessMode      = FMC_BURST_ACCESS_MODE_DISABLE;
        FMC_Handle.Init.WaitSignalPolarity   = FMC_WAIT_SIGNAL_POLARITY_LOW;
        FMC_Handle.Init.WaitSignalActive     = FMC_WAIT_TIMING_BEFORE_WS;
        FMC_Handle.Init.WriteOperation       = FMC_WRITE_OPERATION_ENABLE;
        FMC_Handle.Init.WaitSignal           = FMC_WAIT_SIGNAL_DISABLE;
        FMC_Handle.Init.ExtendedMode         = FMC_EXTENDED_MODE_DISABLE;
        FMC_Handle.Init.AsynchronousWait     = FMC_ASYNCHRONOUS_WAIT_DISABLE;
        FMC_Handle.Init.WriteBurst           = FMC_WRITE_BURST_DISABLE;
        FMC_Handle.Init.ContinuousClock      = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
        FMC_Handle.Init.WriteFifo            = FMC_WRITE_FIFO_ENABLE;
        FMC_Handle.Init.PageSize             = FMC_PAGE_SIZE_NONE;
 
        // Timing
        FMC_NORSRAM_TimingTypeDef FMC_Timing = {0};
        FMC_Timing.AddressSetupTime          = 6;
        FMC_Timing.AddressHoldTime           = 1;
        FMC_Timing.DataSetupTime             = 15;
        FMC_Timing.BusTurnAroundDuration     = 0;
        FMC_Timing.CLKDivision               = 2;
        FMC_Timing.DataLatency               = 3;
        FMC_Timing.AccessMode                = FMC_ACCESS_MODE_A;
 
        if (HAL_SRAM_Init(&FMC_Handle, &FMC_Timing, NULL) != HAL_OK)
        {
            display_driver_active = FALSE;
            return;
        }

U5 code:

FMC_Handle.Instance                  = FMC_NORSRAM_DEVICE;
        FMC_Handle.Extended                  = FMC_NORSRAM_EXTENDED_DEVICE;
        // FMC_Handle.Init
        FMC_Handle.Init.NSBank               = FMC_NORSRAM_BANK1;
        FMC_Handle.Init.DataAddressMux       = FMC_DATA_ADDRESS_MUX_DISABLE;
        FMC_Handle.Init.MemoryType           = FMC_MEMORY_TYPE_SRAM;
        FMC_Handle.Init.MemoryDataWidth      = FMC_NORSRAM_MEM_BUS_WIDTH_8;
        FMC_Handle.Init.BurstAccessMode      = FMC_BURST_ACCESS_MODE_DISABLE;
        FMC_Handle.Init.WaitSignalPolarity   = FMC_WAIT_SIGNAL_POLARITY_LOW;
        FMC_Handle.Init.WaitSignalActive     = FMC_WAIT_TIMING_BEFORE_WS;
        FMC_Handle.Init.WriteOperation       = FMC_WRITE_OPERATION_ENABLE;
        FMC_Handle.Init.WaitSignal           = FMC_WAIT_SIGNAL_DISABLE;
        FMC_Handle.Init.ExtendedMode         = FMC_EXTENDED_MODE_DISABLE;
        FMC_Handle.Init.AsynchronousWait     = FMC_ASYNCHRONOUS_WAIT_DISABLE;
        FMC_Handle.Init.WriteBurst           = FMC_WRITE_BURST_DISABLE;
        FMC_Handle.Init.ContinuousClock      = FMC_CONTINUOUS_CLOCK_SYNC_ONLY;
        FMC_Handle.Init.WriteFifo            = FMC_WRITE_FIFO_ENABLE;
        FMC_Handle.Init.NBLSetupTime         = 0;
        FMC_Handle.Init.PageSize             = FMC_PAGE_SIZE_NONE;
        FMC_Handle.Init.MaxChipSelectPulse   = DISABLE;
 
        // Timing
        FMC_NORSRAM_TimingTypeDef FMC_Timing = {0};
        FMC_Timing.AddressSetupTime          = 6;
        FMC_Timing.AddressHoldTime           = 1;
        FMC_Timing.DataSetupTime             = 15;
        FMC_Timing.DataHoldTime              = 0;
        FMC_Timing.BusTurnAroundDuration     = 0;
        FMC_Timing.CLKDivision               = 2;
        FMC_Timing.DataLatency               = 3;
        FMC_Timing.AccessMode                = FMC_ACCESS_MODE_A;
 
        if (HAL_SRAM_Init(&FMC_Handle, &FMC_Timing, NULL) != HAL_OK)
        {
            display_driver_active = FALSE;
            return;
        }

Tesla DeLorean · ‎2022-03-16

Check pinning

Check schematics

Check expectations of display, and why shift might be occurring

Perhaps stick a scope on the interface, and be sure the clocks, and dividers are consistent with expectations, and that timing is in fact correct.

Try write and read back of display side registers, and memory buffers

If you continue to struggle perhaps hook up a logic analyzers to more clearly define the problem/issue faced.

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View solution in original post

Tesla DeLorean · ‎2022-03-16