CAN总线硬件连接及程序.docx

CAN总线硬件连结及程序 CAN总线硬件连结及程序 CAN总线硬件连结及程序 Word 资料 // F04x_CAN1.c // // // // DEVICE: C8051F040 // // AUTHOR: LS // // TOOLS: Keil C-compiler and Silicon Labs IDE // // // CAN1.c and CAN2.c are a simple example of configuring a CAN network to // transmit and receive data on a CAN network, and how to move information to // and from CAN RAM message objects. Each C8051F040-TB CAN node is configured // to send a message when its P3.7 button is depressed/released, with a 0x11 // to indicate the button is pushed, and 0x00 when released. Each node also has // a message object configured to receive messages. The C8051 tests the // received data and will turn on/off the target boards LED. When one target // is loaded with CAN2.c and the other is loaded with CAN1.c, one target // boards push-button will control the other target boards LED, establishing // a simple control link via the CAN bus and can be observed directly on the // target boards. //////////////////////////////////////////////////////////////////////////////// 24. //////////////////////////////////////////////////////////////////////////////// // Includes //////////////////////////////////////////////////////////////////////////////// 29. #include c8051f040.h // SFR declarations 30. // CAN Protocol Register Index for CAN0ADR, from TABLE 18.1 of the C8051F040 // datasheet //////////////////////////////////////////////////////////////////////////////// 34. #define CANCTRL 0x00 //Control Register 35. #define CANSTAT 0x01 //Status register 36. #define ERRCNT 0x02 //Error Counter Register 37. #define BITREG 0x03 //Bit Timing Register 38. #define INTREG 0x04 //Interrupt Low Byte Register 39. #define CANTSTR 0x05 //Test register 40. #define BRPEXT 0x06 //BRP Extension Register //////////////////////////////////////////////////////////////////////////////// //IF1 Interface Registers //////////////////////////////////////////////////////////////////////////////// 44. #define IF1CMDRQST 0x08 //IF1 Command Rest Register Word