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I am programming avr microcontrollers using avrgcc and avrdude . If am specifying wrong controllers then avrdude throws error message syaing wrong device signature. Is there an avrdude method from which i can find which controller is it connected to like Atmega8,Atmega324,Atmega644 etc. Then it would be easy to change the avrdude command with respect to the controller reply am getting.

ganeshredcobra
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1 Answers1

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As a first attempt, you could try this (admittedly tremendously ugly solution):

SIGNATURE=`sudo avrdude -cusbtiny -p1200 -U signature:r:-:i -F 2>/dev/null 
| head -n1 
| sed "s/^:[0-9A-F]\{8\}\([0-9A-F]\{6\}\)[0-9A-F]*/\1/g" 
| sed "s/\([0-9A-F]\{2\}\)\([0-9A-F]\{2\}\)\([0-9A-F]\{2\}\)/0x\L\1 0x\L\2 0x\L\3/g"` 
&& cat /etc/avrdude.conf 
| grep "\(\<id\>\|$SIGNATURE\)" 
| grep -B 1 signature 
| head -n 1 
| sed "s/.*\"\([a-z0-9]*\)\".*/\1/g"

It works for me on the bash prompt, with a ATtiny2313a being connected to an USBTinyISP and avrdude.conf residing at /etc/.

Let's split it up for a short explanation.

Get the device signature

sudo avrdude -cusbtiny -p1200 -U signature:r:-:i -F 2>/dev/null

Change format to match avrdude.conf

The signature is in the first line of avrdude's output:

| head -n1

Extract the 6 signature digits:

| sed "s/^:[0-9A-F]\{8\}\([0-9A-F]\{6\}\)[0-9A-F]*/\1/g"

Convert to lower case, insert "0x" and ","

| sed "s/\([0-9A-F]\{2\}\)\([0-9A-F]\{2\}\)\([0-9A-F]\{2\}\)/0x\L\1 0x\L\2 0x\L\3/g"

Extract corresponding id from avrdude.conf

Find all id lines plus our one signature line:

cat /etc/avrdude.conf 
| grep "\(\<id\>\|$SIGNATURE\)"

Now extract the corresponding id line for our signature:

| grep -B 1 signature 
| head -n 1

Finally, we remove everything besides the id:

| sed "s/.*\"\([a-z0-9]*\)\".*/\1/g"

The resulting output should be usable with your tools - hope that helps...

leo
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  • i founded a more simple way using a tweak.In C its implemented like thiscase ATMEGA32 : sprintf(Uc,"avrdude -c usbasp -p atmega32 sig 1>hello.txt 2>>hello.txt"); sprintf(Check,"hello=`grep \"avrdude: safemode: Fuses OK\" hello.txt`"); system(Uc); stat=system(Check); if(stat == 0) return stat; printf("Status is %d \n",stat); break; – ganeshredcobra Mar 28 '14 at 12:17
  • Hmm, this only checks whether there is a atmega32 connected or not; It does not tell you what controller actually is connected. – leo Mar 31 '14 at 08:41
  • yup it only checks for atmega32 – ganeshredcobra Mar 31 '14 at 16:27