DDR初始化程序中变量在Expressions里观察时出现错误

andy lee1

各位专家好！

我在DDR初始化程序单步运行的时候，通过Expressions观察程序中变量值的变化情况，可是出现了如图所示的错误，请问是什么原因呢？谢谢！

下面是DDR初始化程序的部分程序

//配置SDRAM 定时寄存器(SDTIM1~SDTIM3)
DDR_Regs->SDRAM_TIM_1   =
  ((unsigned int)(13.5*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_RP_SHIFT)|
  ((unsigned int)(13.5*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_RCD_SHIFT)|
  ((unsigned int)(15*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_WR_SHIFT)|
  ((unsigned int)(36*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_RAS_SHIFT)|
  ((unsigned int)(49.5*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_RC_SHIFT)|
  ((unsigned int)(5-1)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_RRD_SHIFT)|
  ((unsigned int)(7.5*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_1_REG_T_WTR_SHIFT);
DDR_Regs->SDRAM_TIM_2   = (5<<25)| /*ODTH8*/
  ((unsigned int)(6*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_2_REG_T_XP_SHIFT)|
  ((unsigned int)(120*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_2_REG_T_XSNR_SHIFT)|
  ((512-1)<<CSL_EMIF4F_SDRAM_TIM_2_REG_T_XSRD_SHIFT)|
  ((unsigned int)(7.5*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_2_REG_T_RTP_SHIFT)|
  ((unsigned int)(5.625*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_2_REG_T_CKE_SHIFT);
DDR_Regs->SDRAM_TIM_3   =
  ((5)<<CSL_EMIF4F_SDRAM_TIM_3_REG_T_CSTA_SHIFT)|
  ((64-1)<<CSL_EMIF4F_SDRAM_TIM_3_REG_ZQ_ZQCS_SHIFT)|
  ((unsigned int)(110*clock_MHz/1000.f-0.0001f)<<CSL_EMIF4F_SDRAM_TIM_3_REG_T_RFC_SHIFT)|
  ((9-1)<<CSL_EMIF4F_SDRAM_TIM_3_REG_T_RAS_MAX_SHIFT);