Using 2 device with FSMC?

Question

Posted on June 04, 2018 at 10:39Hi,Right now I am facing with the next issue:I am using FSMC to drive an SDRAM (IS66WV51216) and an LCD (https://shop.boxtec.ch/tft-lcd-shield-for-arduino-unomega-ili9481-p-42762.html?language=en). As I use only the SDRAM without TFT, the write and read works fine, but as I connect the display the write/read operations have interesting issues.As I write 1k data in to the SDRAM from 0-1023 and as I read back the numbers are strange (0 0 1 1 7 7 7 7 23 23 ...).But  as I use only the TFT with FSMC it also works fine.I use the next settings: NE1, NE2 -> PULL UPDATA [0 - 16] -> PULL DOWNADDRES[0 - 18] -> NO RESISTORNWE -> PULL UPNOE -> PULL UPA25 -> this is connected to RS pin of TFT (data or command selector) NO RESISTORThe data pins from 0-8 bits are common as the NWE and the NOE pins.The data widths of the devices: TFT => 8 bitsSDRAM => 16 bitsSo separately both device work, but as I would like to use them in one SW it does not work.I am using STM32F417ZET6 uC.Have anybody any idea what should I set up to solve this problem?#tft-and-sdram #sdram-fsmc #fsmc

Sandor Bedo · Answer

Posted on June 04, 2018 at 11:09I forgot to attach the configs:/*  TFT configuration */hsram1.Instance = FSMC_NORSRAM_DEVICE;hsram1.Extended = FSMC_NORSRAM_EXTENDED_DEVICE;/* hsram1.Init */hsram1.Init.NSBank = FSMC_NORSRAM_BANK1;hsram1.Init.DataAddressMux = FSMC_DATA_ADDRESS_MUX_DISABLE;hsram1.Init.MemoryType = FSMC_MEMORY_TYPE_SRAM;hsram1.Init.MemoryDataWidth = FSMC_NORSRAM_MEM_BUS_WIDTH_8;hsram1.Init.BurstAccessMode = FSMC_BURST_ACCESS_MODE_DISABLE;hsram1.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;hsram1.Init.WrapMode = FSMC_WRAP_MODE_DISABLE;hsram1.Init.WaitSignalActive = FSMC_WAIT_TIMING_BEFORE_WS;hsram1.Init.WriteOperation = FSMC_WRITE_OPERATION_ENABLE;hsram1.Init.WaitSignal = FSMC_WAIT_SIGNAL_DISABLE;hsram1.Init.ExtendedMode = FSMC_EXTENDED_MODE_DISABLE;hsram1.Init.AsynchronousWait = FSMC_ASYNCHRONOUS_WAIT_DISABLE;hsram1.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;hsram1.Init.PageSize = FSMC_PAGE_SIZE_NONE;/* Timing */Timing.AddressSetupTime = 2;Timing.AddressHoldTime = 1;Timing.DataSetupTime = 16;Timing.BusTurnAroundDuration = 15;Timing.CLKDivision = 16;Timing.DataLatency = 17;Timing.AccessMode = FSMC_ACCESS_MODE_A; /* SDRAM configuration */hsram2.Instance = FSMC_NORSRAM_DEVICE;hsram2.Extended = FSMC_NORSRAM_EXTENDED_DEVICE;/* hsram2.Init */hsram2.Init.NSBank = FSMC_NORSRAM_BANK2;hsram2.Init.DataAddressMux = FSMC_DATA_ADDRESS_MUX_DISABLE;hsram2.Init.MemoryType = FSMC_MEMORY_TYPE_SRAM;hsram2.Init.MemoryDataWidth = FSMC_NORSRAM_MEM_BUS_WIDTH_16;hsram2.Init.BurstAccessMode = FSMC_BURST_ACCESS_MODE_DISABLE;hsram2.Init.WaitSignalPolarity = FSMC_WAIT_SIGNAL_POLARITY_LOW;hsram2.Init.WrapMode = FSMC_WRAP_MODE_DISABLE;hsram2.Init.WaitSignalActive = FSMC_WAIT_TIMING_BEFORE_WS;hsram2.Init.WriteOperation = FSMC_WRITE_OPERATION_ENABLE;hsram2.Init.WaitSignal = FSMC_WAIT_SIGNAL_DISABLE;hsram2.Init.ExtendedMode = FSMC_EXTENDED_MODE_DISABLE;hsram2.Init.AsynchronousWait = FSMC_ASYNCHRONOUS_WAIT_DISABLE; //FSMC_ASYNCHRONOUS_WAIT_ENABLE;hsram2.Init.WriteBurst = FSMC_WRITE_BURST_DISABLE;hsram2.Init.PageSize = FSMC_PAGE_SIZE_NONE;/* Timing */Timing.AddressSetupTime = 15;Timing.AddressHoldTime = 10; /* 1 */Timing.DataSetupTime = 200;/* 16 */Timing.BusTurnAroundDuration = 15;Timing.CLKDivision = 16;Timing.DataLatency = 17;Timing.AccessMode = FSMC_ACCESS_MODE_A;

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