求助理解外部模式寄存器的配置代码的理解

feixiang20 提问时间：2015-1-8 21:00 /

问答
是否解决:

有懂STM32F429的人给代码编写个注释吗？另有参考资料作为回报
  /* Program the external memory mode register */
  tmpr = (uint32_t)SDRAM_MODEREG_BURST_LENGTH_2       |
               SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL |
               SDRAM_MODEREG_CAS_LATENCY_3          |
               SDRAM_MODEREG_OPERATING_MODE_STANDARD |
               SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;
  /* Configure a load Mode register command*/
  FMC_SDRAMCommandStructure.FMC_CommandMode = FMC_Command_Mode_LoadMode;
  FMC_SDRAMCommandStructure.FMC_CommandTarget = FMC_Command_Target_bank2;
  FMC_SDRAMCommandStructure.FMC_AutoRefreshNumber = 1;
  FMC_SDRAMCommandStructure.FMC_ModeRegisterDefinition = tmpr;
  /* Wait until the SDRAM controller is ready */
  while(FMC_GetFlagStatus(FMC_Bank2_SDRAM, FMC_FLAG_Busy) != RESET)
  {
  }
  /* Send the command */
  FMC_SDRAMCmdConfig(&FMC_SDRAMCommandStructure);