|
本人在CAN节点，之前在BASI模式下，SJA1000是可以正常初始化的；但我现在要用到PELI模式下的自检功能去检测单个节点硬件电路是否正常，但是在PELI模式下SJA1000无法正常读写，导致初始化不成功，请高人指点 #define SJA_BaseAdr 0xFF00 //定义sja1000 的片选基址 p1.0接SJA1000的CS口 sbit SJA1000_RST=P1^1; #define REG_MODE SJA_BaseAdr+0x00 //内部控制寄存器 #define REG_COMMAND SJA_BaseAdr+0x01 //命令寄存器 #define REG_STATUS SJA_BaseAdr+0x02 //状态寄存器 #define REG_IR SJA_BaseAdr+0x03 //中断寄存器 #define REG_IR_ABLE SJA_BaseAdr+0x04 //中断使能控制器 #define REG_BTR0 SJA_BaseAdr+0x06 //总线定时寄存器0 #define REG_BTR1 SJA_BaseAdr+0x07 //总线定时寄存器1 #define REG_OCR SJA_BaseAdr+0x08 //输出控制寄存器 #define REG_TEST SJA_BaseAdr+0x09 //测试寄存器 #define REG_ALC SJA_BaseAdr + 0x0b //0a保留 #define REG_ECC SJA_BaseAdr + 0x0c #define REG_EMLR SJA_BaseAdr + 0x0d #define REG_RXERR SJA_BaseAdr + 0x0e #define REG_TXERR SJA_BaseAdr + 0x0f #define REG_ACR0 SJA_BaseAdr + 0x10 //验收代码寄存器 #define REG_ACR1 SJA_BaseAdr + 0x11 #define REG_ACR2 SJA_BaseAdr + 0x12 #define REG_ACR3 SJA_BaseAdr + 0x13 #define REG_AMR0 SJA_BaseAdr + 0x14 //验收屏蔽寄存器 #define REG_AMR1 SJA_BaseAdr + 0x15 #define REG_AMR2 SJA_BaseAdr + 0x16 #define REG_AMR3 SJA_BaseAdr + 0x17 //以下为发送缓冲区寄存器定义 #define REG_RxBuffer0 SJA_BaseAdr + 0x10 #define REG_RxBuffer1 SJA_BaseAdr + 0x11 #define REG_RxBuffer2 SJA_BaseAdr + 0x12 #define REG_RxBuffer3 SJA_BaseAdr + 0x13 #define REG_RxBuffer4 SJA_BaseAdr + 0x14 //以下为接收缓冲区寄存器定义 #define REG_TxBuffer0 SJA_BaseAdr + 0x10 #define REG_TxBuffer1 SJA_BaseAdr + 0x11 #define REG_TxBuffer2 SJA_BaseAdr + 0x12 #define REG_TxBuffer3 SJA_BaseAdr + 0x13 #define REG_TxBuffer4 SJA_BaseAdr + 0x14 #define REG_DataBuffer1 SJA_BaseAdr + 0x15 #define REG_DataBuffer2 SJA_BaseAdr + 0x16 #define REG_DataBuffer3 SJA_BaseAdr + 0x17 #define REG_DataBuffer4 SJA_BaseAdr + 0x18 #define REG_DataBuffer5 SJA_BaseAdr + 0x19 #define REG_DataBuffer6 SJA_BaseAdr + 0x1a #define REG_DataBuffer7 SJA_BaseAdr + 0x1b #define REG_DataBuffer8 SJA_BaseAdr + 0x1c /* ******************************************************************************************* ** 内部地址 01EH 备用 ******************************************************************************************** */ /* ******************************************************************************************* ** 时钟分频寄存器(内部地址01FH) ******************************************************************************************** */ #define REG_CDR SJA_BaseAdr+0x1F //时钟分频寄存器 #define REG_RBSA SJA_BaseAdr + 0x1e //接收缓冲区首地址 #define REG_Receive_Counter SJA_BaseAdr + 0x1d//RX信息计数器 /* ******************************************************************************************* ** 定义系统指针 利用该地址指针访问sja1000 ******************************************************************************************** */ unsigned char xdata *SJA_BCANAdr; /* ******************************************************************************************* ** 定义命令字 ******************************************************************************************** */ #define TR_CMD 0x01 //发送请求命令 #define AT_CMD 0x02 //夭折发送命令 #define RRB_CMD 0x04 //释放接收缓冲区 #define COS_CMD 0x08 //清除超载状态 #define SRR_CMD 0x10 //进入自接收模式 /* ******************************************************************************************* ** 定义16M 的晶体下CAN 总线波特率 ******************************************************************************************** */ #define ByteRate_5k 0x00 //波特率5kbps #define ByteRate_10k 0x01 //波特率10kbps #define ByteRate_20k 0x02 //波特率20kbps #define ByteRate_40k 0x03 //波特率40kbps #define ByteRate_50k 0x04 //波特率50kbps #define ByteRate_80k 0x05 //波特率80kbps #define ByteRate_100k 0x06 //波特率100kbps #define ByteRate_160k 0x07 //波特率200kbps #define ByteRate_250k 0x08 //波特率250kbps #define ByteRate_320k 0x09 //波特率300kbps #define ByteRate_500k 0x0a //波特率500kbps #define ByteRate_800k 0x0b //波特率600kbps #define ByteRate_1000k 0x0c //波特率1000kbps /* /* 初始化SJA1000 返回1说明读写寄存器失败 */ unsigned char SJA1000_Config_Normal() { if(BCAN_CREATE_COMMUNATION()) return 1;//读写测试寄存器失败 if(BCAN_ENTER_RETMODEL()) return 2; //复位失败 if(BCAN_SET_BANDRATE(0x04)) return 3; //设置为100k波特率通信 失败 if(BCAN_SET_OUTCLK (0x1a,0x80)) return 4;//设置OCR=0X1A,T0推挽输出 CDR=0X00,peli模式，输入没有启用旁路功能 时钟输出为 fOSC/2 if(BCAN_SET_OBJECT0(0x11,0xff)) return 5;//设置ACR0和AMR0 if(BCAN_SET_OBJECT1(0x22,0xff)) return 5;//设置ACR1和AMR1 if(BCAN_SET_OBJECT2(0x33,0xff)) return 5;//设置ACR1和AMR1 if(BCAN_SET_OBJECT3(0x44,0xff)) return 5;//设置ACR1和AMR1 if(BCAN_QUIT_RETMODEL()) return 6; //退出复位模式,进入工作模式 if(BCAN_MODE_COMMUNATION(0x0c)) return 7;//设置自检测模式和单滤波模式 return 0;//初始化成功 } 每次运行初始化函数都返回5，说明ACR,AMR没有读写成功 以下为ACR,AMR的读写函数 bit BCAN_SET_OBJECT0(unsigned char BCAN_ACR,unsigned char BCAN_AMR) { SJA_BCANAdr=REG_ACR0; //访问地址指向验收代码寄存器(ACR0) *SJA_BCANAdr=BCAN_ACR; //写入参数 if(*SJA_BCANAdr != BCAN_ACR) { //校验写入值 return 1; } SJA_BCANAdr=REG_AMR0; //访问地址指向验收屏蔽寄存器(AMR0) *SJA_BCANAdr=BCAN_AMR; //写入参数 if(*SJA_BCANAdr != BCAN_AMR) { //校验写入值 return 1; } return 0; } bit BCAN_SET_OBJECT1(unsigned char BCAN_ACR,unsigned char BCAN_AMR) { SJA_BCANAdr=REG_ACR1; //访问地址指向验收代码寄存器(ACR1) *SJA_BCANAdr=BCAN_ACR; //写入参数 if(*SJA_BCANAdr != BCAN_ACR) { //校验写入值 return 1; } SJA_BCANAdr=REG_AMR1; //访问地址指向验收屏蔽寄存器(AMR1) *SJA_BCANAdr=BCAN_AMR; //写入参数 if(*SJA_BCANAdr != BCAN_AMR) { //校验写入值 return 1; } return 0; } bit BCAN_SET_OBJECT2(unsigned char BCAN_ACR,unsigned char BCAN_AMR) { SJA_BCANAdr=REG_ACR2; //访问地址指向验收代码寄存器(ACR2) *SJA_BCANAdr=BCAN_ACR; //写入参数 if(*SJA_BCANAdr != BCAN_ACR) { //校验写入值 return 1; } SJA_BCANAdr=REG_AMR2; //访问地址指向验收屏蔽寄存器(AMR2) *SJA_BCANAdr=BCAN_AMR; //写入参数 if(*SJA_BCANAdr != BCAN_AMR) { //校验写入值 return 1; } return 0; } bit BCAN_SET_OBJECT3(unsigned char BCAN_ACR,unsigned char BCAN_AMR) { SJA_BCANAdr=REG_ACR3; //访问地址指向验收代码寄存器(ACR2) *SJA_BCANAdr=BCAN_ACR; //写入参数 if(*SJA_BCANAdr != BCAN_ACR) { //校验写入值 return 1; } SJA_BCANAdr=REG_AMR3; //访问地址指向验收屏蔽寄存器(AMR2) *SJA_BCANAdr=BCAN_AMR; //写入参数 if(*SJA_BCANAdr != BCAN_AMR) { //校验写入值 return 1; } return 0; } |
|
|
