PIC16f690 Eread/Ewrite issues

[deryckt]

Hi all,

I seem to have trouble reading & writing to PIC16f690 eeprom using Eread & Ewrite statements.
Have been using these statements successfully with other PIC's i.e 12f675,16f676 etc.
Does anyone know why this is happening? I desperately need a sulotion as I need to complete a urgent project a.s.a.p. Your help will be greatly appreciated.

Here's a snippet of the way I use it.

Dim Mintemp as word
Dim Maxtemp as word
.
.
.
Mintemp = Eread 0
Maxtemp = Eread 2
.
.
.
Ewrite 0, [Mintemp]
Ewrite 2, [Maxtemp]

The moment I include these read/write functions into my code, the whole program somehow becomes corrupt.


Regards
Deryck

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[deryckt]

P.s. I've also tried the following without success:
Mintemp.Lowbyte = Eread 0
Mintemp.Highbyte = Eread 1
etc.

I only use the Eread statements at startup. Thereafter only use Ewrite within the Main loop (while 1=1/wend).

[joesaliba]

Deryck,

Welcome to the forum. I know that in past there was a problem of how the 16F690 handled it's internal memory and caused some problems to write to an LCD. However I do not know if this is related to Ewrite or Eread. If you do a search on the forum for 16F690 I think you might see what was the problem. The problem was related to this PIC and a few others, as I said, it was the structure of those PIC's. What compiler version you are using? I know a special update for those devices to address those PIC was released a few years ago.

[deryckt]

Hi there Joseph,

Thanks a lot for the reply.
Proton IDE version = 2.0.1.0
Compiler = 3.5.2.7

I also did as you said & the search didn't come up with anything of relevance, but I'll keep on trying by viewing all 16f690 related threads. Thanks once again.

Deryck

[John Drew]

Hello Deryck
You have a copy of 3.5.2.7 and yet you are not showing as a licensed user. Please advise how you are using that BETA version.
John

[deryckt]

If you help my, I'll tell....LOL
Recently bought PDS from Dizzy Enterprises (Your S.A. Distributor) and then updated to Beta.
I went through the process to register as a licensed user via the website, but haven't heard anytnhing from anyone as yet. Maybe you can assist?

[John Drew]

Fine Deryck
Please go to "Community" at the top of the page and complete the licensed status request. Lester will attend to it.
John

I can see you've put your details in the registration screen, the 'licensed users form' seems to be a better way of attracting Crownhill's attention.

[deryckt]

Thanks John, will do so. Do you perhaps think that there might be a glitch in the Beta version w.r.t. the 16f690? There seems to be a lot of people having trouble with this PIC. Maybe it lies with Microchip themselves. Would it help rolling back to the 'packaged' compiler and trying Eread/Ewrite again? Is it even possible to roll back?

Thx
Deryck

[joesaliba]

If you take the same program into another PIC will it work?

[deryckt]

Haven't tried that yet. Been all over the internet and I seem to be the only one having this particular problem. As soon as I use the Eread command, it seems to somehow corrupt some of my other variables which is very strange indeed. Is there any other sensible way to save/read 2 Word sized variables. I think an assembly routine with direct addressing might do the trick. Unfortunately I'm not too handy with asm.