topic Re: MC9S08DZ60 MSCAN in 8-bit Microcontrollers

MC9S08DZ60 MSCAN

harisatuluri — Mon, 17 Jun 2013 10:27:52 GMT

Hi All,

can i find any sample code on how to write CAN driver for MSCAN in MC9S08DZ60 and how to read and write the CAN Message Buffers.

Please help me thanks in advance.

Re: MC9S08DZ60 MSCAN

weapon — Tue, 18 Jun 2013 02:42:31 GMT

Hi Satuluri, we provide MSCAN driver in our website. you can search "mscan driver for s08" in our website, then you'll find the link.

In addition, I attached one simpe demo for your reference, which is much earier to understand than that MSCAN driver. Hope it'll be helpful.

Re: MC9S08DZ60 MSCAN

harisatuluri — Wed, 19 Jun 2013 10:34:48 GMT

Hi weiping,

Thanks for your reply i have completed the code and testing it in loop back mode.thanks for your help..

Re: MC9S08DZ60 MSCAN

harisatuluri — Wed, 14 Aug 2013 10:20:06 GMT

Hi weiping,

I am working with the example code given by you but the problem is while i am trying to send a CAN message it is not completing the transmission, its blocked in polling the transmission complete flag, can you please solve me this issue, FYI i am using TLE7250 CAN Tranceiver. Thanks in advance.

Hari

Re: MC9S08DZ60 MSCAN

weapon — Thu, 15 Aug 2013 09:03:16 GMT

Hi Hari,

Is there a receiver nodes? if not, transmitter won't get successful transmission because of no ACK received.

B.R

Weiping

Re: MC9S08DZ60 MSCAN

harisatuluri — Fri, 16 Aug 2013 11:24:09 GMT

Hi weiping,

Thanks for the reply,as you informed i have configured another Hardware as a receiver in listen only mode and connected to the CAN bus, but its of no use,

the problem still remains the same, code is blocking in the while loop for checking the completion of transmission, and it is incrementing the transmitter error count.

As i know CAN doesn't require any acknowledgement for completing transmission as it is not a peer to peer communication protocol, but i tried as you informed and is of no use. So, can you please help me out to clear this problem.

Regards,

Hari

Re: MC9S08DZ60 MSCAN

kef2 — Sat, 17 Aug 2013 17:48:41 GMT

as you informed i have configured another Hardware as a receiver in listen only mode and connected to the CAN bus, but its of no use,

And that's the problem. In listen only mode node can't ACK messages from other nodes. No ACK forces sender to resend it's message. Without active no-listenonly node your sender can't complete sending.

As i know CAN doesn't require any acknowledgement for completing transmission

You know it wrong.

Re: MC9S08DZ60 MSCAN

weapon — Mon, 19 Aug 2013 08:38:13 GMT

Hi Satuluri,

kef2 is right!

Re: MC9S08DZ60 MSCAN

harisatuluri — Mon, 19 Aug 2013 13:12:27 GMT

Hi Edward Karpicz,

Thanks for your reply, i got resolved with the problem of transmission complete flag. But i got struck with another problem,

Here while i am transmitting CAN frame in another node i am able to receive it, but while receiving i am getting the exact ID what i am transmitting but the data is being corrupted. So, can you suggest me any procedure or any validations i need to check while transmitting or receiving data.

Re: MC9S08DZ60 MSCAN

kef2 — Tue, 20 Aug 2013 07:11:05 GMT

I don't believe data is corrupted. Isn't it that you set data size to be less than 8 bytes, but you still expect all 8 bytes to be sent properly? Or something like that?

Re: MC9S08DZ60 MSCAN

weapon — Tue, 20 Aug 2013 07:37:15 GMT

Generally speaking, if the ID is correct,data can't be error. are you sure the transmitter send the data you want?

In additon, it's recommend to use external crystal as CAN' clock source,

Re: MC9S08DZ60 MSCAN

harisatuluri — Tue, 20 Aug 2013 09:33:11 GMT

Hi Edward,

I am sure of sending 4 bytes of data and checking for the 4 bytes of data in receiver end.

I can see the transmitted Data 4 bytes in CANTDSR registers while transmitting, but while receiving i am getting 0xFF in CANRDSR0, CANRDSR1, CANRDSR2, CANRDSR3 registers.

Re: MC9S08DZ60 MSCAN

harisatuluri — Tue, 20 Aug 2013 09:37:20 GMT

Ya, weiping i am using external 4Mhz crystal connected as the Clock source, but still i am having same problem..

Re: MC9S08DZ60 MSCAN

kef2 — Tue, 20 Aug 2013 11:59:39 GMT

Are you trying to send any data with RTR bit set? RTR=1 messages can't carry any data.

Re: MC9S08DZ60 MSCAN

harisatuluri — Tue, 20 Aug 2013 12:41:45 GMT

I am checking the RTR bit too it is in Reset state only, I am able to get the CANRDLR value as i am transmitting, but the received data is 0xFF only.

Re: MC9S08DZ60 MSCAN

kef2 — Wed, 21 Aug 2013 09:12:16 GMT

Certainly something is wrong in your code. I saw no such problems in S08DZ or any other MCU with MSCAN module.

Re: MC9S08DZ60 MSCAN

franz_raaber — Wed, 21 Aug 2013 09:27:23 GMT

Dear Mr. Karpicz,

thank you for your information; I think that I mailed by an incorrect subject.

Yours

Franz Raaber

Von: Edward Karpicz

Gesendet: Mittwoch, 21. August 2013 11:13

An: Raaber Franz

Betreff: Re: - MC9S08DZ60 MSCAN

<https://community.freescale.com/>

MC9S08DZ60 MSCAN

reply from Edward Karpicz<https://community.freescale.com/people/kef2?et=watches.email.thread> in 8-bit Microcontrollers - View the full discussion<https://community.freescale.com/message/345893?et=watches.email.thread#345893>

Re: MC9S08DZ60 MSCAN

harisatuluri — Wed, 21 Aug 2013 13:50:00 GMT

Hi kef2& Weiping,

Thanks for your support, i had successfully transmitted and received the CAN Frames, I got solved with the problem of receiving wrong data.

The problem is while i am continuously transmitting data i have not updated my data pointer which is incrementing while loading into registers, i got the bug and solved it thanks for you support.

Hari.