[En-Nut-Discussion] ds1388 i2c

[myrteza kertusha]

Hi everyone,
I'm working on an Ethernut 2.1 board trying to communicate with a dallas
1388 rtc. I had a few questions to clear out, maybe someone out there can
answer.
1) what do we mean with "SDA High"?
 DDRX1 = 1; // i.e. output direction
 PORTX1 = 1; // i.e. drive high
or

 DDRX1 = 0; // i.e. input direction
 PORTX1 = 1; // i.e. pull-up get activated

or

DDRX1 = 0; // i.e. input direction as in dev/twbbif.c of the NUT/OS declared
in a macro

2) We write to PORTX and we read from PINX? Is it so?

3) PINX reflects what written to PORTX?

Thanx in advance
Best regards
Zac