1wire on extended port not working

nisse · Joined: 14 Dec 2006 Posts: 50

Hi
I'm trying to use 1wire on pinf.6 but it doesn't work.
Same code works fine on pind.0 and d.1

I have atmega128 in 128 mode, Bascom 2.0.7.6.001
Extended = 1 or 0 makes no difference.
Not using the ADC or jtag

I'm stuck Sad

Any suggestions?

/Andy

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

Hi Andy

did you connect both set of Vcc gnd PIN 21 22 / 52 53 ?

not sure if you need to connect Avcc and gnd to 63 64

nisse · Joined: 14 Dec 2006 Posts: 50

yes, there all connected

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

always try some some code that toggles the pin so you can determine if you can really control the pin :
config portF.6 =output
do
toggle portF.6
waitms 1000
loop

then measrure level of portf.6
also check if timing is correct

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

Just tested in ISIS

PortF.6 not working
but I see that portE.6 is activ ???

if I connect portf.6 and porte.6 to my 1 wire I get data OK

can it be a error in m128def.dat or mcs.lib 1Wire ?

Of cause it can be a internal error in ISIS to !!!

@Edit the error was in ISIS
PINE = $00
PINF = $01

thats wrong

PINE = $01
PINF = $00

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

I looked it up:
it will not work for the m128 portF because it has an odd port map :

PINF = $00
PORTF = $62
DDRF = $61

The 1wire depends on the fact that the port/pin/ddr are grouped like pin,ddr,port:
PORTD = $12
DDRD = $11
PIND = $10

it would require a special version of the lib for the m128 portF.

nisse · Joined: 14 Dec 2006 Posts: 50

ok, thanks Mark and Kim, but isn't this what extended=1 is supposed to solve?
/Andy

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

no, that only resolve the case where the address is >&HFF. Like $100. In that case R31 must be set too.

nisse · Joined: 14 Dec 2006 Posts: 50

ok ic
How would you suggest I go about getting a special version of the lib for the m128 portF?
/Andy

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

- open mcs.lib
- copy the code from [1wire] and put it in a new lib
- then look for the code that uses the PIN register :

for example :
Ld r17,Z ; get PIN register

change that like:
Lds r17, PINF

i think it is used twice.

then use $lib to include the modded lib. that should do it.

kimmi · Joined: 24 Feb 2006 Posts: 1922 Location: Denmark

You also need to edit the DDR and PORT
and if you use 1wireserach you must edit [1WIRE_SEARCH] to

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

it should not be needed to change ddr and port but because PIN address is passed which is 0 , you should add $60 to Z.
you could do that by modding this:

_1wire_set_pin:
ldi r30,$60 ; fixed
clr 31 ; fixed
Ld r16,z+1 ; get DDR register

then you do not need to change ddr/portf code.

nisse · Joined: 14 Dec 2006 Posts: 50

Thanks guys, I'll give it a go.
Haven't done any assembler programming since the 6502, 30 years ago, but its a bit like riding a bike, isn't it Smile

/Andy

PS, does the changes you mention apply to all 1wire routines or just the _1wire_set_pin routine?

albertsm · Joined: 09 Apr 2004 Posts: 5921 Location: Holland

it will work for all since they all use this routine first. so the changes are minimal.

nisse · Joined: 14 Dec 2006 Posts: 50

Sorry guys, stuck again Sad

I've copied the [1_WIRE] part from mcs.lib into a new text file, 1wireF.lib
and use $lib "1wireF.lib" in the code.
When compiling I get .DEF not found and Backward jump out of range Sad

@ lib code removed !