Re: Access to ethernet buffer with C

Keil has an address space limitation of 8MB, so FFE000 is too high for it to
address.  You could easily write a little 8051 to read from this area.

Kris

----- Original Message -----
From: <[email protected]>
To: <tini-6tN4nzCoH/[email protected]>
Sent: Wednesday, February 04, 2004 8:58 AM
Subject: [TINI]Access to ethernet buffer with C


>
> Hello!
> How can I access the ethernet buffer on my
> DS80C400 with Keil C?
>
> I tried:
>
> unsigned char far * receiveBuffer = 0xFFE000;
> for(i = 0; i < 256; i++)
>     printf("%2bx", *(receiveBuffer + i));
>
> But this code don?t access the right memory location.
> The setting of IDM1 and IDM0 in MCON is 10 -> 8KB
> buffer = FFE000-FFFFFF.
> Is there something wrong in my Keil settings?
>
> If I change IDM1/IDM0 to 00 I can access the
> buffer with this pointer:
>
> unsigned char far * receiveBuffer = 0x01E000;
> The one in the address is correct!
>
> But the library UDP functions (in my case sendto and
> recvfrom) don?t work.
> Is that the normal behavior?
>
>
> Configuration:
> TINIM400
> Keil 7.07 with LX, AX enabled
>
>
> Any hints?
>
> TIA
> steph
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