Rev 409 | Go to most recent revision | Blame | Last modification | View Log | Download
#!/bin/sh
prg="adude"
#
help()
{
echo "prg_fusebit_uc -- read and write fuse bits of the atmega8"
echo ""
echo "Usage: prg_fusebit_uc [-hu] -r|-w Freq"
echo ""
echo "OPTIONS: -h this help"
echo " -r read fuse bytes"
echo " -u use uisp instead of avrdude"
echo " avrdude can automatically detect dapa or avrusb500."
echo " uisp can only be used with the parallel port dapa."
echo " -w write fuse bytes such that a given Freq is used"
echo " a frequency of 0 means external crystal. Possible"
echo " values are 0,1,2,4,8"
echo ""
echo "EXAMPLE: program the fuses to 4MHz internal"
echo " prg_fusebit_uc -w 4"
echo ""
echo "Warning: you can not undo the setting \"external crystal\" unless"
echo " you have a crystal that works."
echo "This script can be easily adapted to different programmer types"
exit 0
}
while [ -n "$1" ]; do
case $1 in
-h) help;shift 1;;
-u) prg="uisp";shift 1;;
-r) opt_r="1";shift 1;;
-w) opt_w="1";freq="$2";shift 2;;
-*) echo "error: no such option $1. -h for help";exit 1;;
*) break;;
esac
done
if [ -z "$opt_r" -a -z "$opt_w" ];then
# one of those options is mandatory
help
fi
hf=0xd9
if [ "$opt_w" = "1" ]; then
case $freq in
0) lf=0xee;echo "Make sure you have a crystal otherwise you can not change this!";sleep 2;;
1) lf=0xe1;;
2) lf=0xe2;;
4) lf=0xe3;;
8) lf=0xe4;;
*) echo "error: no such frequency, -h for help";exit 1;;
esac
fi
if [ "$prg" = "uisp" ]; then
if [ "$opt_r" = "1" ];then
set -x
uisp -dlpt=/dev/parport0 -dprog=dapa --rd_fuses
set +x
echo "Explanation: Fuse Low Byte: 0xe1 (1MHz intern), 0xe3 (4MHz intern), "
echo " 0xe4 (8MHz intern)"
echo " Fuse High Byte should be 0xd9"
exit 0
fi
if [ "$opt_w" = "1" ]; then
set -x
uisp -dlpt=/dev/parport0 -dprog=dapa --wr_fuse_l=$lf
uisp -dlpt=/dev/parport0 -dprog=dapa --wr_fuse_h=$hf
set +x
exit 0
fi
fi
if [ "$prg" = "adude" ]; then
if grep "Vendor=0403 ProdID=6001" /proc/bus/usb/devices > /dev/null ; then
prg="avrusb500"
else
prg="dapa"
fi
if [ "$opt_r" = "1" ];then
set -x
avrdude -p m8 -c $prg -v -q
set +x
echo "Explanation: Fuse Low Byte: 0xe1 (1MHz intern), 0xe3 (4MHz intern), "
echo " 0xe4 (8MHz intern)"
echo " Fuse High Byte should be 0xd9"
exit 0
fi
if [ "$opt_w" = "1" ]; then
set -x
avrdude -p m8 -c $prg -u -v -U lfuse:w:$lf:m
avrdude -p m8 -c $prg -u -v -U hfuse:w:$hf:m
set +x
exit 0
fi
fi