[avr-gcc-list] uisp problem

[Torsten Mohr]

Hi,

i try to program an ATMega128 with uisp and i have several problems trying 
that.
I already tried to program some fuse bytes and don't know at the moment what
value they have.

If i read the fuses after the first power-up without specifying a part (auto 
detect)
i get:

address@hidden:~/p/avr/hello_led> uisp -dprog=dapa --rd_fuses
Atmel AVR ATmega128 is found.

Fuse Low Byte      = 0xe1
Fuse High Byte     = 0x99
Fuse Extended Byte = 0xff
Calibration Byte   = 0x9e  --  Read Only
Lock Bits          = 0xff
    BLB12 -> 1
    BLB11 -> 1
    BLB02 -> 1
    BLB01 -> 1
      LB2 -> 1
      LB1 -> 1


If i just repeat the exact same command i get:


address@hidden:~/p/avr/hello_led> uisp -dprog=dapa --rd_fuses
Cannot identify device because it is locked.
Device similar to the ATmega103-old is found.

Device is locked.
Address out of memory range.


If i specify that the part is an ATMega128 i get after first power-up:

address@hidden:~/p/avr/hello_led> uisp -dprog=dapa -dpart=atmega128 --rd_fuses
Atmel AVR ATmega128 is found.

Fuse Low Byte      = 0xe1
Fuse High Byte     = 0x99
Fuse Extended Byte = 0xff
Calibration Byte   = 0x9e  --  Read Only
Lock Bits          = 0xff
    BLB12 -> 1
    BLB11 -> 1
    BLB02 -> 1
    BLB01 -> 1
      LB2 -> 1
      LB1 -> 1


If i repeat it, without power-down and -up:


address@hidden:~/p/avr/hello_led> uisp -dprog=dapa -dpart=atmega128 --rd_fuses
Atmel AVR ATmega128 is found.

Fuse Low Byte      = 0xfe
Fuse High Byte     = 0x00
Fuse Extended Byte = 0xfe
Calibration Byte   = 0x00  --  Read Only
Lock Bits          = 0x00
    BLB12 -> 0
    BLB11 -> 0
    BLB02 -> 0
    BLB01 -> 0
      LB2 -> 0
      LB1 -> 0

address@hidden:~/p/avr/hello_led> uisp -dprog=dapa -dpart=atmega128 --rd_fuses
Atmel AVR ATmega128 is found.

Fuse Low Byte      = 0x00
Fuse High Byte     = 0x00
Fuse Extended Byte = 0x00
Calibration Byte   = 0x00  --  Read Only
Lock Bits          = 0x00
    BLB12 -> 0
    BLB11 -> 0
    BLB02 -> 0
    BLB01 -> 0
      LB2 -> 0
      LB1 -> 0



I wrote a program for the PC that reads the parallel ports settings (output  
lines)
and can change them.  Using this program i found that after "uisp -dprog=dapa"
has run once, the lines D0, Init and Strobe are set to high level.

If i change D0 and Strobe to low level i can connect to the ATmega128 without 
the
need to cycle its power before.

But what worries me is that also now (with pre-initialisation of the parallel 
port)
"uisp --verify" shows lots of fails.  In every failing byte, the comparison 
shows
that in the read out memory there are more bits set to 1 than in the just 
downloaded
file.  Also, if i do "uisp --download", the memory contents are not what i 
expect.

After several trys, it looks that the wrong bits are always at the same 
addresses.


So i tried to increase the t_wd_flash to 50000, but the --verify still fails, 
also
if i again increase it by factor *10 to 500000.


I don't have the parallel port pins directly connected to the target.  There 
is a
cuircuit inbetween that ensures proper signal levels (correct +5V / 0V 
outputs).

I use uisp-20050207 on Linux.


Why can't i correctly program the ATmega128?



Best regards,
Torsten.