Re: [Flashforth-devel] FF5.0 on PIC24FV32KA302 -- a couple of issues

[Peter J. <pe...@me...>]

Mike,
    Yes
    Yes
    Don't know, but I don't think that the flash write is the problem.


Here is a transcript of some interaction.  I should have included it 
with the last note.

BPE Fahot I24 5.0

BPE Fahot I24 5.0

BPE Fahot I24 5.0

BPE Fahot I24 5.0

BPE Fahot ICt I24 5.0

   ok<#rm>#rm
   ok<#rm>#rm
2 3 * . 6  ok<,am<,a>

Characters are missing whenever a string is sent by the MCU.  On the 
last start-up message, you can also see out-of-order characters.  I've 
put a logic analyser on the pins and it looks consistent with the 
picture of missing characters shown above (and there were no Xoff 
characters in between).

I'm going to try a PIC24FV16KM202 (which fits the same minimal pin 
layout) today and see if that behaves better.

Peter J.


On 18/04/14 00:23, Mikael Nordman wrote:
> I don't really understand why the UART silicon bug would cause a problem
> with
> the current FF5.0 code.
>
> The TX interrupt routine only writes one character to the TX FIFO
> if the TXFIFO and TX shift register are empty.
>
> In addition XOFF chars are written without checking if the TX FIFO has
> any space.
> If the PC that sends to the PIC
> reacts slowly on the XOFF, FF will send XOFF for every character
> received from the PC.
> But this should not fill the TX FIFO since it has 4 empty places and the
> RX interrupts
> which may send XOFF occur at the same pace that characters are sent out.
>
> Did you experience any real problem?
> Does the UART TX loose any characters ?
> Are characters lost during flash write ?
>
> BR Mike
>
> On 04/17/2014 03:10 PM, Peter Jacobs wrote:
>> (b) The more troublesome issue is the UART silicon bug in my revision 4
>> chips.  There is a work-around of not completely filling the buffer but
>> I think that requires fiddling with the interrupt or queue code, which
>> is a bit beyond my capability at the moment. I added a little bit of
>> code to the main program, as shown below.
>>
>>
>
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