AVR-Chat

On Sun, May 15, 2005 at 12:57:04AM -0400, Pigeon wrote:

> cable)... I use winavr.. and i lacked (or so i thought) a way to
> check fusebits.. but doesn't winavr use avrdude?

Yes.

>and how do I
> check/set fusebits?

Use interactive terminal mode to view fuse/lock bits, i.e.:

  avrdude -p m32 -t
  avrdude> dump lfuse
  >>> dump lfuse 
  0000  3f                                                |?               |

  avrdude> 

To view what on-chip fuse / lock bits you have access to, use the
'part' command.  For the ATmega128, you will see:

avrdude> part
>>> part 

AVR Part              : ATMEGA128
Chip Erase delay      : 9000 us
PAGEL                 : PD7
BS2                   : PA0
RESET disposition     : dedicated
RETRY pulse           : SCK
serial program mode   : yes
parallel program mode : yes
Timeout               : 200
StabDelay             : 100
CmdexeDelay           : 25
SyncLoops             : 32
ByteDelay             : 0
PollIndex             : 3
PollValue             : 0x53
Memory Detail         :

                         Block Poll               Page                       Polled
  Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
  ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
  eeprom         4    12    64    0 no       4096    8      0  9000  9000 0xff 0xff
  flash         33     6   128    0 yes    131072  256    512  4500  4500 0xff 0xff
  lfuse          0     0     0    0 no          1    0      0     0     0 0x00 0x00
  hfuse          0     0     0    0 no          1    0      0     0     0 0x00 0x00
  efuse          0     0     0    0 no          1    0      0     0     0 0x00 0x00
  lock           0     0     0    0 no          1    0      0     0     0 0x00 0x00
  calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
  signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

avrdude>

Low fuse, high fuse, and extended fuse are lfuse, hfuse, and efuse
respectively.

You can set fuses using the 'write' command.  Or you can use the
command line.  For example, to set the lfuse to 0x3f using the
interactive interface, you would:

  avrdude -p m128 -t
  avrdude> write lfuse 0 0x3f

To set the lfuse to 0x3f using the command line, you would:

  avrdude -p m128 -V -U lfuse:w:0x3f:m

-Brian
-- 
Brian Dean
BDMICRO - ATmega128 Based MAVRIC Controllers
http://www.bdmicro.com/