can总线多机通讯接收.doc

#includeSJA1000REG_1.h #includereg52.h #includestdio.h #includestring.h #includeintrins.h #define STD_FRAMEID_LENTH 2 //标准帧ID长度 #define EXT_FRAMEID_LENTH 4 //扩展帧ID长度 #define LOW_BYTE(x) (unsigned char)(x) #define HIGH_BYTE(x) (unsigned char)((unsigned int)(x)8) #define OSCCLKL #define CPUCLK (OSCCLK/12) #define SJA_BASE_ADDR 0X7E00 #define T0_MASK 0x0f sbit LED=P2^5; sbit SJA1000_RST=P2^6; unsigned char xdata *SJA_CS_Point=(unsigned char xdata*)SJA_BASE_ADDR; void SJA1000_Init(unsigned char btr0,unsigned char btr1,unsigned char *filter); void WriteSJAReg(unsigned char RegAdr,unsigned char Value); //写寄存器 unsigned char ReadSJAReg(unsigned char RegAdr); //读寄存器 char SetBitMask(unsigned char RegAdr,unsigned char BitValue); //设置寄存器特定位 char ClearBitMask(unsigned char RegAdr,unsigned char BitValue); //清除寄存器特定位 char WriteSJARegBlock(unsigned char RegAdr,unsigned char *ValueBuf,unsigned char len); //连续写寄存器 char ReadSJARegBlock(unsigned char RegAdr,unsigned char *ValueBuf,unsigned char len); //连续读寄存器 char SetSJASendCmd(unsigned char cmd); //发送模式cmd 0为正常发送 1为单次发送 2为自发自收 char SJASendData(unsigned char *databuf,unsigned char cmd); //sja1000发送函数，将数据写入sja1000发送缓冲区，再将其发到总线上 char SJARcvData(unsigned char *databuf); //SJA1000接收函数 读取接收缓冲区的CAN报文 //void SJA1000_Config_Filter(char mode,char *Filter); //配置滤波器模式和滤波参数 mode大于0为双滤波器，其他为单滤波 unsigned char SJA_CAN_Filter[8]={ 0x00,0x00,0x00,0x00,0xff,0xff,0xff,0xff}; typedef struct //结构定义 { unsigned long ID; unsigned char FF; unsigned char RTR; unsigned char DLC; unsigned char CanData[8]; } CanFrame_t; CanFrame_t UserRecData; unsigned char UserData[8]; unsigned char UserID[4]; unsigned char UserFF,UserRTR,UserDLC; void UserDataDeal() { unsigned char temp2; temp2=UserData[0]; P1=temp2; } void NumDataDeal() { UserID[0]=((UserRecData.ID5)8)0xff; UserID[1]=(UserRecData.ID5)0xf0; UserRTR=UserRecData.RTR; UserFF=UserRecData.FF; UserDLC=UserRecData.DLC; UserData[0]=UserR