TMS320F28335: 关于ecan的问题

我参考了贵司提供的ECAN例程，编写了以下代码

/*
* can.c
*/

#include "DSP2833x_Device.h" // DSP2833x Headerfile Include File

struct ECAN_REGS ECanaShadow;
struct ECAN_REGS ECanbShadow;

void mailbox_read(int16 MBXnbr);

void setcan(){

//配置发送的邮箱
ECanaMboxes.MBOX25.MSGID.all = 0x95555555; //第25号邮箱的信息ID

ECanaShadow.CANMD.all = ECanaRegs.CANMD.all;
ECanaShadow.CANMD.bit.MD25 = 0; //配置成0为发送邮箱
ECanaRegs.CANMD.all = ECanaShadow.CANMD.all;

ECanaShadow.CANME.all = ECanaRegs.CANME.all;
ECanaShadow.CANME.bit.ME25 = 1; //使能第25号邮箱
ECanaRegs.CANME.all = ECanaShadow.CANME.all;

ECanaMboxes.MBOX25.MSGCTRL.bit.DLC = 8; //规定了发送或者接受字节数为8，一字节等于八位

//配置接收的邮箱
ECanbMboxes.MBOX26.MSGID.all = 0x95555555; //第26号邮箱的信息ID

ECanbShadow.CANMD.all = ECanbRegs.CANMD.all;
ECanbShadow.CANMD.bit.MD26 = 1; //配置成1为接收邮箱
ECanbRegs.CANMD.all = ECanbShadow.CANMD.all;

ECanbShadow.CANME.all = ECanbRegs.CANME.all;
ECanbShadow.CANME.bit.ME26 = 1; //使能第26号邮箱
ECanbRegs.CANME.all = ECanbShadow.CANME.all;

ECanbMboxes.MBOX26.MSGCTRL.bit.DLC = 8; //规定了发送或者接受字节数为8，一字节等于八位

//设置发送数据

ECanaMboxes.MBOX25.MDL.all = 0x55555555;
ECanaMboxes.MBOX25.MDH.all = 0x55555555;//发送的数据

//开始发送
ECanaShadow.CANTRS.all = 0;
ECanaShadow.CANTRS.bit.TRS25 = 1; // Set TRS for mailbox under test 开始传输
ECanaRegs.CANTRS.all = ECanaShadow.CANTRS.all;

do
{
ECanaShadow.CANTA.all = ECanaRegs.CANTA.all;
} while(ECanaShadow.CANTA.bit.TA25 == 0 );// Wait for TA5 bit to be set 当发送成功时该位置位为1

ECanaShadow.CANTA.all = 0; //
ECanaShadow.CANTA.bit.TA25 = 1; // Clear TA5
ECanaRegs.CANTA.all = ECanaShadow.CANTA.all;

mailbox_read(26);

}

Uint32 TestMbox1 = 0;
Uint32 TestMbox2 = 0;
Uint32 MSGI=0;

void mailbox_read(int16 MBXnbr)
{
volatile struct MBOX *Mailbox;
Mailbox = &ECanaMboxes.MBOX0 + MBXnbr;
TestMbox1 = Mailbox->MDL.all;
TestMbox2 = Mailbox->MDH.all;
MSGI = Mailbox->MSGID.all;
}

运行之后发现一直在：ECanaShadow.CANTA.all = ECanaRegs.CANTA.all;

这一行卡死，发现是Ecan没有接收，我在硬件上已经将GPIO30和8，GPio31和10连接在一起，请问这个问题怎么解决呢？谢谢您