Re: Guidance on AN82527 from Intel

Hello Mauricio

read carefully what John wrote.
Check your CAN controller _and_ transceiver design and get a a PC based 
other node as communication partner.
I'm sure that you will find an application note or some example source code
for the initialization of an transmit buffer.

Having a transceiver is a must.
As a first step,
I recommend that you don't connect another node 
but connect a oscilloscope and a termination resistor.
After a successful initialization and 
setting the transmit request, you should see a CAN frame repeated forever.
Try to measure the time a single bit takes
and compare with the expected value.
Than you can see if you have to adjust the bit timing set up
before you connect with another node.
The program at
http://www.can-wiki.info/bittiming/tq.htm
helps you finding the correct values for registers BTR0 and BTR1.
select "NXP SJA1000 or Intel" as controller type.


Good luck
 Heinz-Jürgen Oertel


Am Freitag 05 April 2013, 13:28:21 schrieb Mauricio Gott:
> Hello!
> I have the task of checking the functionality of a reel of these IC
> from intel, but have not worked with any CAN devices before so i
> started from scratch.
> So far:
> I already defined my test method,
> I actually managed to read/ write correctly from all Control, Config,
> and Message registers.
> Ive established all of these conditions listed on the datasheet for a
> transmission:
> 
> Conditions required to transmit a data frame:
> 1) Init bit e 0
> 2) MsgVal bit e 1
> 3) direction e transmit
> 4) NewDat bit e 1
> 5) TxRqst e 1
> 
> I also checked  the steps listed in "7.4 Host-CPU Handling of Message
> Objects 1±14 (Direction = Transmit)":
> Power Up
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