68300

Anybody know of a way to transmit your "first" CAN frame under interrupt
control using the TouCAN?  My transmit code is in the interrupt handler,
but the TouCAN apparently won't give me a transmit interrupt until I've
transmitted something.  It's a catch-22.  The book says I can't set a flag
in the IFLAG register manually.  And, I'd rather not call the body of my
interrupt handler as a subroutine for the special case of my first
transmission.  Any ideas?

Thanks,

Jeff

Nevermind.  I figured out another way.

I'm going to invoke my transmit ISR using a TRAP instruction for my very
first transmission after reset.  In order to avoid the special case in my
transmit routine, I'm going to send a dummy CAN frame from my TouCAN INIT
routine with the TouCAN in loopback mode.

Jeff





jeffrey.tenney@... on 12/11/2002 03:04:04 PM

Please respond to 68300@yahoogroups.com

To:    68300@yahoogroups.com
cc:

Subject:    [68300] TouCAN -- first Tx interrupt?


Anybody know of a way to transmit your "first" CAN frame under interrupt
control using the TouCAN?  My transmit code is in the interrupt handler,
but the TouCAN apparently won't give me a transmit interrupt until I've
transmitted something.  It's a catch-22.  The book says I can't set a flag
in the IFLAG register manually.  And, I'd rather not call the body of my
interrupt handler as a subroutine for the special case of my first
transmission.  Any ideas?

Thanks,

Jeff




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