ecan初始化失败

只看该作者 · 2018-3-23 17:23

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 · 2018-3-23 17:54

是在仿真的时候出现，还是实际运行（不连仿真器）的情况下出现？

只看该作者 · 2018-3-23 18:04

不连仿真器；我是用串口下载.hex文件，下载完之后程序不运行，注释掉以下语句程序可正常运行，但CAN未被成功初始化
do
   {
      ECanaShadow.CANES.all = ECanaRegs.CANES.all;
   } while(ECanaShadow.CANES.bit.CCE != 0);