I read thru the AN2283 document, which explains the interrupt structure in
805. In my program i have used the Transmit buffer 0 to store the message. I
initially stored the message in Transmit buffer 0 and clear the TXE0 flag by
writing 1 to it. I also set TXEIE0 to give a transmit interrupt. But
after this the MSCAN does not set the TXE0 flag to transmit the message. I am
not sure if we shld set the flag or wait for the TXE0 flag to be set.
Cheers,
Chandru
-- Chandru Ramkumar, 828 S Claremont
Ave,Apt#1 Chicago-IL 60612
Reply by Corey, Rick●April 19, 20052005-04-19
Hi
Chandru
I
don't remember it well enough to just answer. I would have to re-read
the docs and look at my code for a while to give a good answer.
I can only do that after work hours, and I know I have to work
until 7:00 today anyway, to catch up on some things. I'll answer as
soon as I can.
It may
be hard to get a real interrupt to occur - I don't know if you are using
something like the old SDK or setting up interrupt registers yourself -
don't forget to set a priority (GRP register? IPR? ITCN?) as well as
the right vector.
If the
chip is really sending the packet out on the wire, it should be easier
to see the "TX Empty" flag being sent, than to get a real interrupt to
fire. A scope should tell you if the packet really is being
sent. Probably it will not be sent "successfully" until some other chip
(or the loopback) ACKs the packet being sent. I forget if MSCAN will set
"TX Empty" (or whatever the flag really is) if it gets no
ACK.
I
forget if just looking at the CAN registers with the debugger will confuse the
MSCAN peripheral - the debugger seems to read the registers in order to display
them, and maybe reading one of them will change its state. (I
forget.)
Rick
Corey
-----Original Message----- From: m...@yahoogroups.com
[mailto:m...@yahoogroups.com]On Behalf Of Chandrasekar Ramkumar Sent: Tuesday, April 19, 2005 1:12 PM To:
m...@yahoogroups.com Subject: [motoroladsp] Question regarding
interrupts in DSP56F805
Hi Rick,
I read thru the AN2283 document, which explains the interrupt structure in
805. In my program i have used the Transmit buffer 0 to store the message. I
initially stored the message in Transmit buffer 0 and clear the TXE0 flag by
writing 1 to it. I also set TXEIE0 to give a transmit interrupt. But
after this the MSCAN does not set the TXE0 flag to transmit the message. I am
not sure if we shld set the flag or wait for the TXE0 flag to be set.
Cheers,
Chandru
-- Chandru Ramkumar, 828 S Claremont
Ave,Apt#1 Chicago-IL 60612NEW! You can now post a message or
access and search the archives of this group on DSPRelated.com: http://www.dsprelated.com/groups/motoroladsp/1.php
_____________________________________ Note: If you do a simple "reply"
with your email client, only the author of this message will receive your
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I recently had a question for Freescale
Tech Support about FlexCAN (on the 56F8357), and they sent me some sample
code as well as answering the
question. It was for
the '8357, so it won't help you with the '805
(MSCAN).
However, if you ask
them your question, maybe they have sample code for the '805 they would
share!
They will ask you to
register by giving your name and so on, but they are very good about answering
questions.
Rick
Corey
-----Original Message----- From: m...@yahoogroups.com
[mailto:m...@yahoogroups.com]On Behalf Of Chandrasekar Ramkumar Sent: Tuesday, April 19, 2005 1:12 PM To:
m...@yahoogroups.com Subject: [motoroladsp] Question regarding
interrupts in DSP56F805
Hi Rick,
I read thru the AN2283 document, which explains the interrupt structure in
805. In my program i have used the Transmit buffer 0 to store the message. I
initially stored the message in Transmit buffer 0 and clear the TXE0 flag by
writing 1 to it. I also set TXEIE0 to give a transmit interrupt. But
after this the MSCAN does not set the TXE0 flag to transmit the message. I am
not sure if we shld set the flag or wait for the TXE0 flag to be set.
Cheers,
Chandru
-- Chandru Ramkumar, 828 S Claremont
Ave,Apt#1 Chicago-IL 60612NEW! You can now post a message or
access and search the archives of this group on DSPRelated.com: http://www.dsprelated.com/groups/motoroladsp/1.php
_____________________________________ Note: If you do a simple "reply"
with your email client, only the author of this message will receive your
answer. You need to do a "reply all" if you want your answer to be
distributed to the entire group.
_____________________________________ About this discussion group:
