can过滤器组的问题

ceeu · 发表于 2015-8-10 13:35:52

最近看 can代码有这个情况

[mw_shl_code=c,true]#if !defined (STM32F10X_LD) && !defined (STM32F10X_LD_VL) && !defined (STM32F10X_MD) && !defined (STM32F10X_MD_VL) && !defined (STM32F10X_HD) && !defined (STM32F10X_HD_VL) && !defined (STM32F10X_XL) && !defined (STM32F10X_CL) /* #define STM32F10X_LD */ /*!< STM32F10X_LD: STM32 Low density devices */ /* #define STM32F10X_LD_VL */ /*!< STM32F10X_LD_VL: STM32 Low density Value Line devices */ /* #define STM32F10X_MD */ /*!< STM32F10X_MD: STM32 Medium density devices */ /* #define STM32F10X_MD_VL */ /*!< STM32F10X_MD_VL: STM32 Medium density Value Line devices */ /* #define STM32F10X_HD */ /*!< STM32F10X_HD: STM32 High density devices */ /* #define STM32F10X_HD_VL */ /*!< STM32F10X_HD_VL: STM32 High density value line devices */ /* #define STM32F10X_XL */ /*!< STM32F10X_XL: STM32 XL-density devices */ /* #define STM32F10X_CL */ /*!< STM32F10X_CL: STM32 Connectivity line devices */ #endif /* Tip: To avoid modifying this file each time you need to switch between these devices, you can define the device in your toolchain compiler preprocessor. - Low-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. - Low-density value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. - Medium-density devices are STM32F101xx, STM32F102xx and STM32F103xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes. - Medium-density value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes. - High-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes. - High-density value line devices are STM32F100xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes. - XL-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 512 and 1024 Kbytes. - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers. */ [/mw_shl_code]

互联型是STM32F10X_CLStm32中文手册上说

Stm32中文手册上说
可是stm32f10x.h文件里

[mw_shl_code=c,true]typedef struct { __IO uint32_t MCR; __IO uint32_t MSR; __IO uint32_t TSR; __IO uint32_t RF0R; __IO uint32_t RF1R; __IO uint32_t IER; __IO uint32_t ESR; __IO uint32_t BTR; uint32_t RESERVED0[88]; CAN_TxMailBox_TypeDef sTxMailBox[3]; CAN_FIFOMailBox_TypeDef sFIFOMailBox[2]; uint32_t RESERVED1[12]; __IO uint32_t FMR; __IO uint32_t FM1R; uint32_t RESERVED2; __IO uint32_t FS1R; uint32_t RESERVED3; __IO uint32_t FFA1R; uint32_t RESERVED4; __IO uint32_t FA1R; uint32_t RESERVED5[8]; #ifndef STM32F10X_CL CAN_FilterRegister_TypeDef sFilterRegister[14]; #else CAN_FilterRegister_TypeDef sFilterRegister[28]; #endif /* STM32F10X_CL */ } CAN_TypeDef; [/mw_shl_code]

这段怎么理解

[mw_shl_code=c,true]#ifndef STM32F10X_CL CAN_FilterRegister_TypeDef sFilterRegister[14]; #else CAN_FilterRegister_TypeDef sFilterRegister[28]; #endif /* STM32F10X_CL */ [/mw_shl_code]

这段怎么理解