[Efi332] Queued SCI transmit with interrupts on MPC555

[David Eicher]

Good idea, thanks Jeff, I'll check on it.

 

Regards,

 

Dave

 

 

  _____  

From: efi332-bounces at diy-efi.org [mailto:efi332-bounces at diy-efi.org] On
Behalf Of BowTieVette at aol.com
Sent: Thursday, December 08, 2005 5:38 PM
To: efi332 at diy-efi.org
Subject: Re: [Efi332] Queued SCI transmit with interrupts on MPC555

 

In a message dated 12/8/2005 9:53:59 A.M. Eastern Standard Time,
sailors3 at comcast.net writes:

Hi John,

 

This morning I got up, fired up the machine, and ran this again. Now it does
not work..., it ran several times last night but after being powered down
all night, it does not. I must have had the hardware in some state that
allowed it to work, which I can't duplicate this morning. So, I'm still
trying to figure out a combination of "start transmit" code and ISR that
will keep the queue transmitting reliably. Does you or anyone have an
suggestions about what is wrong/missing from this code?

 

Thanks,

 

Dave

Dave,

I think something that was mentioned on the mpc500 list may be at the root
of the variability you are seeing. Could a SCI error be hanging the
transmission on you? You might check all the SCI flags in your ISR to be
sure an error did not occur there as well. Since the QSCI is really appears
to be a macro on top of the SCI, I think you are still subject to having to
handle all the SCI errors. There could well be something in your QSCI
implementation that makes SCI more prone to errors. If this turns out to be
the(an) issue you may be able to take the handling of these right from my
332 code SCI interrupt handler.

jc

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