Re: [avr-chat] Do people like the XMEGA?

[Erik Walthinsen]

On 02/15/2013 10:08 AM, Thomas D. Dean wrote:
> I have a device marked ATXMEGA128A1 AU.  It has the same signarure,
> 4C 97 1E as the datasheet shows for the ATMEGA128A1U.
>
> How does one tell the difference?

That one kinda ticked me off when I discovered it.  What I do is I check 
both the signature and the USBCAL0:1 bytes in the production signature. 
 If bytes 0x1a:0x1b are 0xffff, then it's *not* a USB-capable chip.

My workflow has a script that identifies a chip via avrdude before 
running a compile script for that chip.  The identify script is:

----- xmega-identify  (called with e.g. "-cavrisp2 -Pusb")
chipsig="$HOME/xmega-chipsig"
avrdude="avrdude -px16a4 $*"

# Figure out what chip we're targetting
echo 'read prodsig 0x1a 2' | $avrdude -F -t > /tmp/$$ 2>&1
sig=`grep 'Device signature' /tmp/$$ | awk '{print $5}'`

if `grep -v -q '001a  ff ff' /tmp/$$`;then
  sig="${sig}u"
fi

grep "$sig:" $chipsig | cut -d: -f2-
rm -f /tmp/$$
-----

---- xmega-chipsig
0x1e9441:AVR_SHORT=x16a4;AVR_LONG=atxmega16a4;AVR_BOOTOFF=0x04000
0x1e9541:AVR_SHORT=x32a4;AVR_LONG=atxmega32a4;AVR_BOOTOFF=0x08000
0x1e9541u:AVR_SHORT=x32a4u;AVR_LONG=atxmega32a4u;AVR_BOOTOFF=0x08000
0x1e9646:AVR_SHORT=x64a4;AVR_LONG=atxmega64a4;AVR_BOOTOFF=0x10000
0x1e9746:AVR_SHORT=x128a4;AVR_LONG=atxmega128a4;AVR_BOOTOFF=0x20000
0x1e9746u:AVR_SHORT=x128a4u;AVR_LONG=atxmega128a4u;AVR_BOOTOFF=0x20000
0x1e9642:AVR_SHORT=x64a3;AVR_LONG=atxmega64a3;AVR_BOOTOFF=0x10000
0x1e9742:AVR_SHORT=x128a3;AVR_LONG=atxmega128a3;AVR_BOOTOFF=0x20000
0x1e9742u:AVR_SHORT=x128a3u;AVR_LONG=atxmega128a3u;AVR_BOOTOFF=0x20000
0x1e9744:AVR_SHORT=x192a3;AVR_LONG=atxmega192a3;AVR_BOOTOFF=0x30000
0x1e9744u:AVR_SHORT=x192a3u;AVR_LONG=atxmega192a3u;AVR_BOOTOFF=0x30000
0x1e9842:AVR_SHORT=x256a3;AVR_LONG=atxmega256a3;AVR_BOOTOFF=0x40000
0x1e9842u:AVR_SHORT=x256a3u;AVR_LONG=atxmega256a3u;AVR_BOOTOFF=0x40000
0x1e964e:AVR_SHORT=x64a1;AVR_LONG=atxmega64a1;AVR_BOOTOFF=0x10000
0x1e974c:AVR_SHORT=x128a1;AVR_LONG=atxmega128a1;AVR_BOOTOFF=0x20000
0x1e974e:AVR_SHORT=x192a1;AVR_LONG=atxmega192a1;AVR_BOOTOFF=0x30000
0x1e9846:AVR_SHORT=x256a1;AVR_LONG=atxmega256a1;AVR_BOOTOFF=0x40000
. . . . (to be expanded)
-----