F28335 ECAN

Woo Suwan

Prodigy 40 points

Hi I have make CAN communication to use loofback example and to check CANTX pin by Oscillpscope.

But... I can not see CAN Tx Data. So I need to your advice.

I did init set

InitECana() , InitECanaGpio() (GPIO 18,19) ,

MBOX0 : IDE 11bit ID set , AAM Tx set , STDMSGID set , Data length set , MD0 = 1 MBOX0 Tx , Enable ME0 = 1

Self loop test.

and I did send data in 1s main roof

I write MBOX Data.

ECanaShadow.CANTRS.all = 0;

ECanaShadow.CANTRS.bit.TRS0 = 1;

ECanaRegs.CANTRS.all = ECanaShadow.CANTRS.all;

do{

ECanaShadow.CANTA.all = ECanaRegs.CANTA.all;

} while(!ECanaShadow.CANTA.bit.TA0);

ECanaShadow.CANTA.all = 0;

ECanaShadow.CANTA.bit.TA0 = 1;

ECanaRegs.CANTA.all = ECanaShadow.CANTA.all;

I do not know why I can't check communication data by oscilloscope.

I did delete Self Test mode but also result.

over 11 years ago

0 Frank Bormann over 11 years ago

Mastermind 7585 points

In selftest-mode there is no message transmitted, you will not see anything on CAN-Tx.
For a real CAN-transmit, you need a 2nd node. Both nodes must use transceivers.

0 Woo Suwan over 11 years ago in reply to Frank Bormann

Prodigy 40 points

Hi frank.
thanks for answer.

I have can transceiver TJA1042/3 and Vector CANOE.

I think If active ECAN, I can see CAN Message Data from DSP to Transceiver.

0 Frank Bormann over 11 years ago in reply to Woo Suwan

Mastermind 7585 points

If you send with selftest disabled, then you should see the first frames between pin CANTx and the Transceiver. If you do not have a 2nd node , your 1st node will go into bus off soon.
CANOE is Software, which runs on some Vector hardware. Most Vector hardware operates in silent mode by default and this will not produce ACK.

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F28335 ECAN