Re: petSD project page

From: Ingo Korb <>
Date: Thu, 09 Jun 2011 20:52:58 +0200
Message-ID: <>
Nils Eilers <> writes:

> At the moment, the data lines have to get connected straight in a row
> at a single port - but there are few ports whithout any special lines.

Port A is probably the best one for this job, the only special function
on there is the ADC.

> This is just a puzzle... and the 644/1284 has too less ports to satisfy
> all needs, especially if you want to use JTAG. Maybe I should use
> another AVR with more ports (and SMD) to develop the code, and then port
> it back to the 644/1284 without JTAG -- I don't know, have to think
> about it.

Do you really need JTAG? During the entire sd2iec development I needed
it just once and in hindsight it would've been possible to find the
problem[1] without it.

> I have to puzzle out first, what to connect where and when...

Well, at least the AVR has a sane pinout[2] and there are no unused bits
in the middle of a GPIO port[3]...


[1] One-byte buffer overflow in a variable on the stack resulting
    in a null pointer access which overwrites the CPU registers.
[2] pins of GPIO port 0, bits 0 to 11 on the LPC1768 (TQFP100):
    46, 47, 98, 99, 81, 80, 79, 78, 77, 76, 48, 49
[3] "Pins 2, 3, 5, 6, 7, 11, 12, and 13 of [Port 1] are not available"

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Received on 2011-06-09 19:00:13

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