Author Topic: Save Constant In Memory Of Display DP600?  (Read 4937 times)

jgarzon

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Save Constant In Memory Of Display DP600?
« on: May 28, 2013, 07:37:31 PM »
Hello friends,

Hello friends
I have a program I get a parameter, compares and calculates me which has been the largest value. But when you turn the display off and re-ignite DP600, the program had forgotten the value calculated before and empiesa from scratch my number more. Is there some method to store the value, and that when I turn on the display resumes the value saved had greater than before to continue the comparison?

Thanks For The Collaboration  ;D

Offline Marbek_Elektronik

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Re: Save Constant In Memory Of Display DP600?
« Reply #1 on: May 28, 2013, 09:50:29 PM »
Hi,

What does the left elements do? Comparator and switch? - I think: nothing!

OK:
I would take the max - function.
Then compare the actual and the last value.
If they are not equal, store the max. value in a NV-memory .
In display, it is a FRAM. So you can store unfinitely.

Please try this.
If you need help, please ask.

By
Marbek Elektronik, Dipl.-Ing. Bernd Konrad
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Offline Neil

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Re: Save Constant In Memory Of Display DP600?
« Reply #2 on: May 28, 2013, 10:03:06 PM »
Hi Jgarzon.

I was putting this together (see below) as Bernd replied, I agree with his comments.

Please be aware of the EE structure during the process

EEPROM write/erase cycles
(all modules except IX012-010, IX024-010)
1 million Minimum valid over entire operating
temperature range.

EEPROM write/erase cycles
(IX012-010, IX024-010)
10,000 Minimum valid over entire operating
temperature range.

FRAM write/erase cycles
(all extended memory modules-MC0XX-XX8)
100 trillion Minimum valid over entire operating
temperature range.


regards Neil


ET

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Re: Save Constant In Memory Of Display DP600?
« Reply #3 on: May 28, 2013, 10:09:56 PM »
The memory component you are using is for volatile memory.
i.e. RAM, which is lost upon powering off the computer/screen.

What you need is a non-volatile memory component.
It should be in GUIDE under the Components tab -> Connection -> Non-Volatile Memory Dynamic.
In my opinion, it's input/output wires are not convenient or understandable enough for how you would normally use NVM 99% of the time.
So, I wrote a set of wrapper pages around it, for each variable type that I use.
(U8, U16, U32, S16, and S32)
Attached is the wrapper for U32.

These wrappers are a bit wasteful, since the underlying hardware will write an entire 32-bit word, even if you only need 8 bits, but I use little enough NVM that it shouldn't be a problem in my applications.
Keep in mind the above comments for maximum number of write cycles.
I worked out the math last year, and a rule-of-thumb I came to is that if you write to a NVM component less often than every 10 minutes, or 80 times per day, then your NVM will last for twenty years.

jgarzon

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Re: Save Constant In Memory Of Display DP600?
« Reply #4 on: May 28, 2013, 10:10:41 PM »
Thanks For Your Answers.
Helped Me Pretty  ;D

Offline Marbek_Elektronik

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Re: Save Constant In Memory Of Display DP600?
« Reply #5 on: September 25, 2013, 08:07:10 AM »
I think NV-memory on controller (MC050-010) is organized in 16 bit, not in 32 bit.
If you write 1 bit you lose 2 Bytes=16bit.

Display is organized in blocks of 4 bytes, but you can use every byte: Write 4 U8-constants and you have used 4 bytes - that is OK.
 
Marbek Elektronik, Dipl.-Ing. Bernd Konrad
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