DEC2812与凌华CAN接口卡7841的通信

bjanzhuang

DEC2812与凌华CAN接口卡7841的通信 [复制链接]

我用两根线将DEC2812的CAN接口与凌华CAN接口卡相连。两者都设置成1M波特率。
但是2812总是信息发送不出去，相应的CANTA位总不能置位。
但是，单独DEC2812自测试模式下工作正常，单独凌华接口卡CAN自己通信（双口）也正常。
请问是什么原因，应该从哪几个方面加以考虑？

naebemn

那就应该是程序的问题吧

wolfliu_67

是相同的程序，但2812和凌华的卡都是都是工作正常的呀？
2812为什么会发送不出信息呢？看了TI文档相关寄存器说明，但是也没有说明在什么情况下，发送会失败。

yuyangln198

应该是程序问题，你用的什么通讯规约？

ccccwoele

       现在DSP能发送数据了，TA位可以置位了，用示波器观察也可以看到总线上有波形，但只是CAN卡接不到数，不知为什么？程序如下：

#include \"DSP28_Device.h\"
#define TXCOUNT 10000 // Transmission will take place (TXCOUNT) times..
unsigned int i,j;
long loopcount = 0; // Counts the # of times the loop actually ran

void InitECan(void);

main()
{
/* Initialize the CAN module */

struct ECAN_REGS ECanaShadow;

/* Initialize the CAN module */
InitECan();

/* Write to the MSGID field */
ECanaMboxes.MBOX5.MID.all = 0x9FFFFFFF; // Extended Identifier

ECanaShadow.CANMD.all = ECanaRegs.CANMD.all;
ECanaShadow.CANMD.bit.MD5 = 0;
ECanaRegs.CANMD.all = ECanaShadow.CANMD.all;

ECanaShadow.CANME.all = ECanaRegs.CANME.all;
ECanaShadow.CANME.bit.ME5 = 1;
ECanaRegs.CANME.all = ECanaShadow.CANME.all;

ECanaMboxes.MBOX5.MCF.bit.DLC = 8;

ECanaMboxes.MBOX5.MDRL.all = 0x0;
ECanaMboxes.MBOX5.MDRH.all = 0x0;

/* Begin transmitting */
// while(1) // Uncomment this line for infinite transmissions
for(; // Uncomment this line for finite transmissions
{
ECanaShadow.CANTRS.all = 0;
ECanaShadow.CANTRS.bit.TRS5 = 1; // Set TRS for mailbox under test
ECanaRegs.CANTRS.all = ECanaShadow.CANTRS.all;
while(ECanaRegs.CANTA.bit.TA5 == 0 ) {} // Wait for TA5 bit to be set..
ECanaShadow.CANTA.all = 0;
ECanaShadow.CANTA.bit.TA5 = 1; // Clear TA5
ECanaRegs.CANTA.all = ECanaShadow.CANTA.all;
loopcount ++;
}
}

void InitECan(void)
{
long i;
asm(\" EALLOW\";

SysCtrlRegs.WDCR = 0x006F;

SysCtrlRegs.PCLKCR.all = 0x4000;

SysCtrlRegs.PLLCR= 0x000A;

for(i=0; i<100000; i++) // Delay for PLL to stabilize
{ asm(\"  NOP \"; }

GpioMuxRegs.GPFMUX.bit.CANTXA_GPIOF6 = 1;
GpioMuxRegs.GPFMUX.bit.CANRXA_GPIOF7 = 1;

ECanaRegs.CANTIOC.bit.TXFUNC = 1;
ECanaRegs.CANRIOC.bit.RXFUNC = 1;



ECanaRegs.CANMC.bit.SCM = 1;

ECanaMboxes.MBOX0.MCF.all = 0x00000000;
ECanaMboxes.MBOX1.MCF.all = 0x00000000;
ECanaMboxes.MBOX2.MCF.all = 0x00000000;
ECanaMboxes.MBOX3.MCF.all = 0x00000000;
ECanaMboxes.MBOX4.MCF.all = 0x00000000;
ECanaMboxes.MBOX5.MCF.all = 0x00000000;
ECanaMboxes.MBOX6.MCF.all = 0x00000000;
ECanaMboxes.MBOX7.MCF.all = 0x00000000;
ECanaMboxes.MBOX8.MCF.all = 0x00000000;
ECanaMboxes.MBOX9.MCF.all = 0x00000000;
ECanaMboxes.MBOX10.MCF.all = 0x00000000;
ECanaMboxes.MBOX11.MCF.all = 0x00000000;
ECanaMboxes.MBOX12.MCF.all = 0x00000000;
ECanaMboxes.MBOX13.MCF.all = 0x00000000;
ECanaMboxes.MBOX14.MCF.all = 0x00000000;
ECanaMboxes.MBOX15.MCF.all = 0x00000000;
ECanaMboxes.MBOX16.MCF.all = 0x00000000;
ECanaMboxes.MBOX17.MCF.all = 0x00000000;
ECanaMboxes.MBOX18.MCF.all = 0x00000000;
ECanaMboxes.MBOX19.MCF.all = 0x00000000;
ECanaMboxes.MBOX20.MCF.all = 0x00000000;
ECanaMboxes.MBOX21.MCF.all = 0x00000000;
ECanaMboxes.MBOX22.MCF.all = 0x00000000;
ECanaMboxes.MBOX23.MCF.all = 0x00000000;
ECanaMboxes.MBOX24.MCF.all = 0x00000000;
ECanaMboxes.MBOX25.MCF.all = 0x00000000;
ECanaMboxes.MBOX26.MCF.all = 0x00000000;
ECanaMboxes.MBOX27.MCF.all = 0x00000000;
ECanaMboxes.MBOX28.MCF.all = 0x00000000;
ECanaMboxes.MBOX29.MCF.all = 0x00000000;
ECanaMboxes.MBOX30.MCF.all = 0x00000000;
ECanaMboxes.MBOX31.MCF.all = 0x00000000;

ECanaRegs.CANTA.all = 0xFFFFFFFF;

ECanaRegs.CANRMP.all = 0xFFFFFFFF;

ECanaRegs.CANGIF0.all = 0xFFFFFFFF;
ECanaRegs.CANGIF1.all = 0xFFFFFFFF;

ECanaRegs.CANMC.bit.CCR = 1 ; // Set CCR = 1
while(ECanaRegs.CANES.bit.CCE != 1 ) {} // Wait for CCE bit to be set..
ECanaRegs.CANBTC.bit.BRP =9;
ECanaRegs.CANBTC.bit.TSEG2 = 4;
ECanaRegs.CANBTC.bit.TSEG1 = 8;
ECanaRegs.CANMC.bit.CCR = 0 ; // Set CCR = 0
while(ECanaRegs.CANES.bit.CCE == !0 ) {} // Wait for CCE bit to be cleared..
/* Disable all Mailboxes */
ECanaRegs.CANME.all = 0; // Required before writing the MSGIDs
}

sdlmhjs

问题解决，可以通讯了。
可能是线接的不好。