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硬件:DSP28335的eCAN-B与vp230连接,USBcan采用的是周立功的u***can-i与上位机连接。
出现的问题是上位机上的监控软件没法接受到DSP的eCAN模块发过来的数据。 下面是代码: void main(void) { struct ECAN_REGS ECanbShadow; InitSysCtrl();//开启系统时钟和外设时钟 InitECanGpio();//这里用到的是ecan-b的GPIO12和GPIO13 DINT; InitPieCtrl(); IER = 0x0000; IFR = 0x0000; InitPieVectTable(); MessageReceivedCount = 0; EALLOW; ECanbShadow.CANtiOC.all = ECanbRegs.CANTIOC.all; ECanbShadow.CANTIOC.bit.TXFUNC = 1; ECanbRegs.CANTIOC.all = ECanbShadow.CANTIOC.all; ECanbShadow.CANRIOC.all = ECanbRegs.CANRIOC.all; ECanbShadow.CANRIOC.bit.RXFUNC = 1; ECanbRegs.CANRIOC.all = ECanbShadow.CANRIOC.all; EDIS; ECanbRegs.CANME.all = 0; ECanbMboxes.MBOX0.MSGID.all = 0x01C40000;//发送 标准帧 ECanbMboxes.MBOX1.MSGID.all = 0x18040000;//接受 ECanbRegs.CANMD.all=0x00000002;//1->RX 0->tx ECanbRegs.CANME.all = 0x00000003; ECanbMboxes.MBOX0.MSGCTRL.bit.DLC = 8; ECanbMboxes.MBOX1.MSGCTRL.bit.DLC = 8; ECanbMboxes.MBOX0.MSGCTRL.bit.RTR = 0; ECanbMboxes.MBOX1.MSGCTRL.bit.RTR = 0; ECanbMboxes.MBOX0.MDL.all = 0x9555AAA0; ECanbMboxes.MBOX0.MDH.all = 0x89ABCDEF; EALLOW; ECanbRegs.CANMIM.all = 0xFFFFFFFF; ECanbRegs.CANMIL.all = 0; ECanbShadow.CANMC.all = ECanbRegs.CANMC.all; ECanbShadow.CANMC.bit.CCR = 1; ECanbRegs.CANMC.all = ECanbShadow.CANMC.all; EDIS; // Wait for CCE bit to be set.. do { ECanbShadow.CANES.all = ECanbRegs.CANES.all; } while(ECanbShadow.CANES.bit.CCE != 1 ); // Configure the eCAN timing EALLOW; ECanbShadow.CANBTC.all = ECanbRegs.CANBTC.all; ECanbShadow.CANBTC.bit.BRPREG = 9; // (BRPREG + 1) = 1 ECanbShadow.CANBTC.bit.TSEG2REG = 1 ; // to the CAN module ECanbShadow.CANBTC.bit.TSEG1REG = 6; // Bit time = 2us,则为500kbps ECanbShadow.CANBTC.bit.SAM = 1; ECanbRegs.CANBTC.all = ECanbShadow.CANBTC.all; ECanbShadow.CANMC.all = ECanbRegs.CANMC.all; ECanbShadow.CANMC.bit.CCR = 0; ECanbRegs.CANMC.all = ECanbShadow.CANMC.all; EDIS; do { ECanbShadow.CANES.all = ECanbRegs.CANES.all; } while(ECanbShadow.CANES.bit.CCE != 0 ); // Configure the eCAN for self test mode // Enable the enhanced features of the eCAN. EALLOW; ECanbShadow.CANMC.all = ECanbRegs.CANMC.all; ECanbShadow.CANMC.bit.ABO = 1; ECanbShadow.CANMC.bit.STM = 0; // Configure CAN for self-test mode ECanbShadow.CANMC.bit.SCB = 1; // eCAN mode (reqd to access 32 mailboxes) ECanbRegs.CANMC.all = ECanbShadow.CANMC.all; EDIS; // Begin transmitting for(;;) { ECanbRegs.CANTRS.all = 0x00000001; // Set TRS for all transmit mailboxes,MX0开始发送 while(ECanbRegs.CANTA.all != 0x00000001 ) {} // Wait for all TAn bits to be set..发送完成后对应的位被置1 ECanbRegs.CANTA.all = 0x0000FFFF; // Clear all TAn MessageReceivedCount++; //Read from Receive mailboxes and begin checking for data */ } } 我的想法是邮箱0设为发送邮箱,邮箱1设为接受。系统频率为100Mhz,can波特率为500k.程序运行后一直等待在while(ECanbRegs.CANTA.all != 0x00000001 ) {}这一步,也就是说没有发送完成等待置位。 |
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6个回答
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现在论坛都没人鸟啊。
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hello,有人吗???
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试一下是不是波特率的问题。。
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楼主你好,你解决了没?我也碰到了这个问题,能指导一下吗?
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can总线 pca8c251t,pca82c250t,tja1055t,tja1054t,tja1050,tja1042,tja1041,tja1040,tja1020,tja1021,tja1023,uja1075,uja1076请找尚润电子连俊良QQ:2880186251
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同样的情况,求是什么问题
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