[Efi332] Queued SCI transmit with interrupts on MPC555

[BowTieVette at aol.com]

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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