TRIS setting for the DS1302

[Dennis]

@Steve :-)

Thanks for that info , actually saw your posts as I was sifting through the forum posts on DS1307 and DS1302 and I2Cread and I2CWrite , in fact I even tried it with my DS1302 (of course it didn't work since I2C is not what should be used for the DS1302) :-)
Will try get something going for the DS1302 using that stub you posted and see what comes of it and will definitely give the DS1307 stubs a good bash when I get my DS1307.

Regarding this line though ...

Write_1307:                          ' Set time & date to 19:00:00  14th Feb 201

, do you think they made much of a fuss about Valentines day back then ?
I also wonder if this isn't how the Rosetta stone came about, some ancients trying to scribe stuff into a rock...it's just like us really .. we are making rock (Silicon) do some really wild things.
Even wirelessly rock to rock ...INSANE hey ?
Now to explain those cave paintings !

Chat soon

Kind regards

Dennis

[malc-c]

Regarding this line though ...

Write_1307:                          ' Set time & date to 19:00:00  14th Feb 201

, do you think they made much of a fuss about Valentines day back then ?
I also wonder if this isn't how the Rosetta stone came about, some ancients trying to scribe stuff into a rock...it's just like us really .. we are making rock (Silicon) do some really wild things.
Even wirelessly rock to rock ...INSANE hey ?
Now to explain those cave paintings !

Chat soon

Kind regards

Dennis

LOL - must check my posts before uploading

[Dennis]

@Steve ..apologies .. was actually asking Malc-c about valentines day :-)
@ Steve , regarding these lines :

high rst         ' Ready for transfer
Shiftout IO, SCLK, LSBFIRST, [$bf] ' Read all 8 RTC registers in burst mode     
Shiftin IO, SCLK, LSBPRE, [rtcsec, rtcmin, rtchr, rtcdate, rtcmonth, rtcday, rtcyear, rtccontrol]
low rst         ' Reset RTC

I understand these
LSBFIRST ' MODE 0 - Shift data out lowest bit first. Clock idles low.
LSBPRE ' MODE 0 - Shift data in lowest bit first,Read data before sending clock. Clock idles low.
But what is the [$bf] ?

@Malc-c --to err is human :-)

Kind regards

Dennis

[Byte_Butcher]

$bf is the register address for clock burst mode read I believe.

Do a search for $bf in the ds1302 data sheet.


steve

[Dennis]

Yes had just checked data sheet just after I posted !
$bf is for burst mode :-)

Thanks to all who replied .. this is making a whole lot more sense now :-)

Kind regards
Dennis

[Dennis]

@ Steve ...
Do you have a snippet for the write in burst mode so one can set the clock ?

Kind regards

Dennis

[Byte_Butcher]

Sure, this should do it:

settime:    ' Subroutine to write time to RTC
        RST = 1         ' Ready for transfer
        Shiftout IO, SCLK, LSBFIRST, [$8e, 0]  ' Enable write
        RST = 0         ' Reset RTC
        RST = 1         ' Ready for transfer
            ' Write all 8 RTC registers in burst mode
        Shiftout IO, SCLK, LSBFIRST, [$be, rtcsec, rtcmin, rtchr, rtcdate, rtcmonth, rtcday, rtcyear, 0]
        rst = 0        
        Return

steve