Good comments Olin!

I was just trying to get a raw form of the necessary processes.
I totally agree on the limits, I'd use a FIFO.
(WITH boundary checks.)

Tom

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-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of
Olin Lathrop
Sent: Monday, June 05, 2006 1:03 PM
To: Microcontroller discussion list - Public.
Subject: Re: [PIC] C30 Linker Problem

Thomas C. Sefranek wrote:
> C:\NP\NeuroLogica\Analog\Software\ISRs.o(.text+0x2c): In function
> `_U2RXInterrupt':
> C:\NP\NeuroLogica\Analog\Software\ISRs.c:72: undefined reference to
> DataRdyUART2'
>
C:\NP\NeuroLogica\Analog\Software\ISRs.o(.text+0x3c):C:\NP\NeuroLogica\Analo
> g\Software\ISRs.c:74: undefined reference to `ReadUART2'

What really surprises me here is that the undefined references don't have
underscores prepended.  The C30 compiler puts an underscore in front of
globally known symbol names.  This can be useful when mixing ASM30 and C30.
You can define entry points for the same routine in ASM30, one without the
underscore and one with.  Each can follow the calling conventions for that
language.

So given all that, I don't understand why the missing external is
"ReadUART2" and not "_ReadUART2".  I know this doesn't answer your question,
but it is probably a clue.

Is it possible that the UART C runtime routines have their own library.  I
would look around for LIB files in the C30 directory.

> IFS1bits.U2RXIF = 0; // Clear the UART2 RX IRQ Flag bit.
> while(DataRdyUART2())
> {
> ( *(Received_data)++) = ReadUART2();
> }
> }

Shouldn't you be doing some limit checking on the array bounds here?  If
it's a circular buffer, how about overrun checking?


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