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基于28335；初始化时在while(ECanaShadow.CANES.bit.CCE != 0)处陷入死循环；时钟已打开；系统时钟
25MHz；哪位大侠帮分析一下原因，感激不尽！代码如下： void InitECana(void) { struct ECAN_REGS ECanaShadow; EALLOW; // EALLOW enables access to protected bits /* Configure eCAN RX and TX pins for CAN operation using eCAN regs*/ ECanaShadow.CANtiOC.all = ECanaRegs.CANTIOC.all; ECanaShadow.CANTIOC.bit.TXFUNC = 1; ECanaRegs.CANTIOC.all = ECanaShadow.CANTIOC.all; ECanaShadow.CANRIOC.all = ECanaRegs.CANRIOC.all; ECanaShadow.CANRIOC.bit.RXFUNC = 1; ECanaRegs.CANRIOC.all = ECanaShadow.CANRIOC.all; /* Configure eCAN for HECC mode - (reqd to access mailboxes 16 thru 31) */ // HECC mode also enables time-stamping feature ECanaRegs.CANME.all = 0; ECanaShadow.CANMC.all = ECanaRegs.CANMC.all; ECanaShadow.CANMC.bit.SCB = 1; ECanaRegs.CANMC.all = ECanaShadow.CANMC.all; /* Initialize all bits of 'Master Control Field' to zero */ // Some bits of MSGCTRL register come up in an unknown state. For proper operation, // all bits (including reserved bits) of MSGCTRL must be initialized to zero ECanaMboxes.MBOX0.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX1.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX2.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX3.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX4.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX5.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX6.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX7.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX8.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX9.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX10.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX11.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX12.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX13.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX14.MSGCTRL.all = 0x00000000; ECanaMboxes.MBOX15.MSGCTRL.all = 0x00000000; // TAn, RMPn, GIFn bits are all zero upon reset and are cleared again // as a matter of precaution. ECanaRegs.CANTA.all = 0xFFFFFFFF; /* Clear all TAn bits */ ECanaRegs.CANRMP.all = 0xFFFFFFFF; /* Clear all RMPn bits */ ECanaRegs.CANGIF0.all = 0xFFFFFFFF; /* Clear all interrupt flag bits */ ECanaRegs.CANGIF1.all = 0xFFFFFFFF; //ECanaRegs.CANMIM.all = 0xFFFFFFFF; /* Configure bit timing parameters for eCANA*/ ECanaShadow.CANMC.all = ECanaRegs.CANMC.all; ECanaShadow.CANMC.bit.CCR = 1; // Set CCR = 1 ECanaRegs.CANMC.all = ECanaShadow.CANMC.all; EDIS; ECanaShadow.CANES.all = ECanaRegs.CANES.all; { ECanaShadow.CANES.all = ECanaRegs.CANES.all; } while(ECanaShadow.CANES.bit.CCE != 1); // Wait for CCE bit to be set.. EALLOW; ECanaShadow.CANBTC.all = 0; ECanaShadow.CANBTC.bit.BRPREG = 4; ECanaShadow.CANBTC.bit.TSEG2REG = 1; ECanaShadow.CANBTC.bit.TSEG1REG = 6; #endif //ECanaShadow.CANBTC.bit.SJWREG = 2; //ECanaShadow.CANBTC.bit.SAM = 1; ECanaShadow.CANBTC.bit.SAM = 1; ECanaRegs.CANBTC.all = ECanaShadow.CANBTC.all; ECanaShadow.CANMC.all = ECanaRegs.CANMC.all; //把CANMC读入影子寄存器 ECanaShadow.CANMC.bit.CCR = 0; //改变配置请求位 ECanaRegs.CANMC.all = ECanaShadow.CANMC.all; //把配置好的寄存器值回写 ECanaShadow.CANES.all = ECanaRegs.CANES.all; EDIS; do { ECanaShadow.CANES.all = ECanaRegs.CANES.all; } while(ECanaShadow.CANES.bit.CCE != 0); /* Disable all Mailboxes */ ECanaRegs.CANME.all = 0; } 
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回帖奖励 +2 分积分
不懂,等待高手解惑~~
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回帖奖励 +2 分积分 |
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2017-10-8 16:31:50
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回帖奖励 +2 分积分 |
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回帖奖励 +2 分积分
不懂，等待高手解答。。
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回帖奖励 +2 分积分
不懂，等待高手解答
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