Matrix user forums

A question about eeprom
Hello everyone
If the eeprom data are organized in 8 bits how do i save a number greater than 255?
I have thought to do this for example if I have to save 1234 except for the first address 1 on the second 2 on the third 3 and on the fourth 4 when I go to read the individual leases I do
1 * 1000
2 * 100
3 * 10
4 * 1
Then sum up all the values getting 1234
Is this correct or does a better way to do this?

thank you

Hi maxtisc,
You can use two EEPROM memory locations to store any integer value.
Take a look at this thread.
I'm sure there are other threads as well.

Martin

Hi Martin
Thanks for your post is very interesting, I did some simple tests and works very well
thank you so much

Your welcome.
Glad I can help.

Martin.

Hi Martin
I tried to transfer the concept of post to hardware (arduino 2560 V3 + nextion display ) but it does not work, in simulation it works fine.
In my opinion there is a bug on the management of the internal eeprom
I attach a simple test file maybe you see something that is not set correctly
thanks

Hi maxtisc,
Do you want to see if attached works any better?

Martin

Thank you for your interest
Unfortunately, it does not work

Hello,

Can you tell us exactly what the hardware is doing?

it does not work

Doesn't give us much to go on.

Hello
In the small test program only the serial 232 n ° 1 is used to command the nextion display.

Then in the original program in the eeprom will be saved the set_points that will be called up when the system restarts, via the modifier keyboard the setpoints I see are regularly saved in the volatile memory but the program restarts only incorrect values, so I did a program Part to test only the eeprom function
thanks

Hello,

The value should be 257 when you program the device (0x0101) and that is the value the simulation is giving. What value is your hardware generating when you program the device?

hello
The given value is always 0

Do you have a programmer that will allow you to read EEPROM contents so you can verify that EEPROM addresses contain correct values?
No point in reading EEPROM is values stored are incorrect.
This is my EEPROM test Flowchart.
I could expand it to cover number higher than 255

Martin

Hello
I do not have an eeprom reader
I solved my problem with a 24c64 memory that works in I2C and works fine, with internal memory not working to save data.
thank you