ecan 初始化问题

只看该作者 · 2017-9-21 22:12

基于28235；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;
}

只看该作者 · 2017-9-21 22:58

本帖最后由 hwhbuaahwhbuaa 于 2017-9-21 23:46 编辑

是基于28335

只看该作者 · 2017-9-22 09:23

本帖最后由 hwhbuaahwhbuaa 于 2017-9-26 16:18 编辑

hwhbuaahwhbuaa 发表于 2017-9-21 22:58
是基于28335

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ecan 初始化问题

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