问带有AS4C4M32S SDRAM的STM32F469只能写入第一个字节

EN

hsdram1.Instance = FMC_SDRAM_DEVICE;
  /* hsdram1.Init */
  hsdram1.Init.SDBank = FMC_SDRAM_BANK1;
  hsdram1.Init.ColumnBitsNumber = FMC_SDRAM_COLUMN_BITS_NUM_8;
  hsdram1.Init.RowBitsNumber = FMC_SDRAM_ROW_BITS_NUM_12;
  hsdram1.Init.MemoryDataWidth = FMC_SDRAM_MEM_BUS_WIDTH_32;
  hsdram1.Init.InternalBankNumber = FMC_SDRAM_INTERN_BANKS_NUM_4;
  hsdram1.Init.CASLatency = FMC_SDRAM_CAS_LATENCY_3;
  hsdram1.Init.WriteProtection = FMC_SDRAM_WRITE_PROTECTION_DISABLE;
  hsdram1.Init.SDClockPeriod = FMC_SDRAM_CLOCK_PERIOD_2;
  hsdram1.Init.ReadBurst = FMC_SDRAM_RBURST_DISABLE;
  hsdram1.Init.ReadPipeDelay = FMC_SDRAM_RPIPE_DELAY_0;
  /* SdramTiming */
  SdramTiming.LoadToActiveDelay = 2;
  SdramTiming.ExitSelfRefreshDelay = 7;
  SdramTiming.SelfRefreshTime = 4;
  SdramTiming.RowCycleDelay = 6;
  SdramTiming.WriteRecoveryTime = 2;
  SdramTiming.RPDelay = 2;
  SdramTiming.RCDDelay = 2;
 
  if (HAL_SDRAM_Init(&hsdram1, &SdramTiming) != HAL_OK)
  {
    Error_Handler( );
  }
 
  /* USER CODE BEGIN FMC_Init 2 */
 
    FMC_SDRAM_CommandTypeDef cmd = { 0 };
 
    cmd.CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
    cmd.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
    cmd.AutoRefreshNumber = 1;
    cmd.ModeRegisterDefinition = 0;
    HAL_SDRAM_SendCommand(&hsdram1, &cmd, 0xFFFF);
 
    HAL_Delay(100);
 
    cmd.CommandMode = FMC_SDRAM_CMD_PALL;
    cmd.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
    cmd.AutoRefreshNumber = 1;
    cmd.ModeRegisterDefinition = 0;
    HAL_SDRAM_SendCommand(&hsdram1, &cmd, 0xFFFF);
 
 
    cmd.CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
    cmd.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
    cmd.AutoRefreshNumber = 8;
    cmd.ModeRegisterDefinition = 0;
    HAL_SDRAM_SendCommand(&hsdram1, &cmd, 0xFFFF);
 
 
    cmd.CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
    cmd.CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
    cmd.AutoRefreshNumber = 1;
    cmd.ModeRegisterDefinition = (uint32_t) 0x230; //also tried 0x231
    HAL_SDRAM_SendCommand(&hsdram1, &cmd, 0xFFFF);
 
 
 
    //Setup SDRAM Refresh Timer Register with the delay between refresh cycles of the SDRAM, this is SDRAM specific.
    HAL_SDRAM_ProgramRefreshRate(&hsdram1, 1404); //Tried 1386