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palcal

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Joined: 12/10/2011
Location: Australia
Posts: 2006

Posted: 12:45am 07 Apr 2019

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I am trying to save some data to the DS3231 RTC. The RTC module I am using has an EPROM on board. The code I am using is..

Function SAVETORTC(R$)
Local X 'A local X variable, perhaps totally seperate from a global X
For X=1 To 3 'Step through the three-byte date data, and save it to the RTC RAM
RTC SETREG 50+X, Asc(Mid$(R$,X,1))
Next
End Function

Function READRTC$()
Local X,B, R$
For X=1 To 3
RTC GETREG 50+X,B
R$=R$+Chr$(B)
Next
READRTC$ = R$
End Function

Courtesy of TassyJim I think.
Then to retrieve to code

Saved_Rain$ = READRTC$()
Rain_Saved = Val(Saved_Rain$)

and to send data to the EPROM

x= SAVETORTC(R$)

where R$ contains the data to save.
The code is not working, has anyone successfully saved to the RTC?

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 2006

Posted: 05:34am 07 Apr 2019

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It seems the DS3231 does not have SRAM like the DS3232. However my DS3231 module does have on board a AT24C32 EEPROM but I have no idea how to save to it.
Maybe easier to get a DS3232 but they are expensive.Edited by palcal 2019-04-08

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

palcal

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Location: Australia
Posts: 2006

Posted: 07:07am 07 Apr 2019

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It's all too hard so I have upgraded to an E-64 and will log to the SD card, much easier.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

twofingers

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Joined: 02/06/2014
Location: Germany
Posts: 1671

Posted: 09:21am 07 Apr 2019

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palcal said The code is not working, has anyone successfully saved to the RTC?

palcal said However my DS3231 module does have on board a AT24C32 EEPROM but I have no idea how to save to it.

I saw you have found a solution (the E-64).

However, there is already some code for the DS3231:
https://www.thebackshed.com/forum/forum_posts.asp?TID=6917&PN=1&TPN=2

The cheap DS1307 has

Quote 56-byte, battery-backed, nonvolatile (NV) RAM for data storage

The RTC, however, is not very precise.

Regards Michael

causality ≠ correlation ≠ coincidence

palcal

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Joined: 12/10/2011
Location: Australia
Posts: 2006

Posted: 08:21pm 07 Apr 2019

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Thanks for that, might save me a lot of work, I haven't moved over to the E-64 yet, I will give it a try and report back.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

palcal

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Location: Australia
Posts: 2006

Posted: 10:11pm 07 Apr 2019

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@ twofingers
That works great, so easy, thanks very much.

"It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all"

Turbo46

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Joined: 24/12/2017
Location: Australia
Posts: 1646

Posted: 04:32am 08 Apr 2019

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Twofingers,

Great bit of code! One of the hidden gems on the TBS. It really ought to be in the Library - things like this are so hard to find later. Would you mind putting it in the Library? or I can do it on your behalf if you like.

Bill

Keep safe. Live long and prosper.

twofingers

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Joined: 02/06/2014
Location: Germany
Posts: 1671

Posted: 09:06am 08 Apr 2019

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@Paul

I am pleased to hear that!

@Bill

I would appreciate it if you could do it. I am not very familiar with the library.
All of my code samples here in TBS are public domain.

Best regards
Michel

causality ≠ correlation ≠ coincidence

Turbo46

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Joined: 24/12/2017
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Posts: 1646

Posted: 10:03am 08 Apr 2019

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Will do Michel,

If there is anything else that you would like put in the Library please send me a link to it.

Cheers
Bill

Keep safe. Live long and prosper.

twofingers

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Joined: 02/06/2014
Location: Germany
Posts: 1671

Posted: 11:15am 08 Apr 2019

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Quote Will do Michel,

Thanks Bill!

Quote If there is anything else that you would like put in the Library please send me a link to it.

If you want, you can find most of my posts in my profile. I can not decide which posts are worth copying to the library. That's the job of the members here, when they find out that something is useful. Some code samples already exist in the library, others may need to be reworked.

Greetings
Michael

causality ≠ correlation ≠ coincidence

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