24C04 I2C EEPROM read issue after several words with 89C52 microcontroller assembly

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#1 21667426 05 Apr 2013 13:49

Debdas Choudhury Debdas Choudhury

Anonymous

Post #1
21667426 05 Apr 2013 13:49

I have written a software in assembly language to save words from PS2 key board to the 24CXX
and then to read the data from that. My saving system is working but time of reading after some words has been successfully read , the system behaves like hanging. I have made and tested the software for 89C52 with 24C04 (I2C)
So I requesting you please help me
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#2 21667427 05 Apr 2013 14:01

Boi Okken Boi Okken

Anonymous

Post #2
21667427 05 Apr 2013 14:01

Hey!
I am certainly no expert in PIC microcontrollers but i could always give it a try (AVR guy here). Is the code in assembly, c or basic? Could you upload the code to a site like pastebin so that we can see it?
Yours sincerely,
Boi Okken
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#3 21667428 06 Apr 2013 17:15

Mark Harrington Mark Harrington

Anonymous

Post #3
21667428 06 Apr 2013 17:15

You have to be careful when reading keybourd some letters have other characters appended to them for example the shift , tab , escape keys etc Don’t forget you also have the enter key as well So without knowing what processor you use and having a flow chart plus character maps etc or knowing what protocol you are suing for 24 cXX plus keyboard then there could also be issues with this as well

We will try to see what info we can offer but the above is a must plus obviously language written in
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#4 21667429 07 Apr 2013 05:12

Debdas Choudhury Debdas Choudhury

Anonymous

Post #4
21667429 07 Apr 2013 05:12

I thanking you for your kind attention.
My reading software for keyboard is write and also the saving system because if I save "A" in the beginning and after
20 or 30 alphabet again I save "A" then the time of reading 1st 20 or 30 are easily read by the 8051 processor then the system behaves like hang , where the protocol for every alphabet are same.
#5 21667430 07 Apr 2013 07:29

ganesh Bhosle ganesh Bhosle

Anonymous

Post #5
21667430 07 Apr 2013 07:29

Can you please explain following:
1. which method your using for accessing PS2 keyboard. interrupt driven or polling?
2. which controller you are using?

generally such hang up occurs due to stack overflow. insufficient RAM memory...
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#6 21667431 07 Apr 2013 12:28

Debdas Choudhury Debdas Choudhury

Anonymous

Post #6
21667431 07 Apr 2013 12:28

Thank to you for your suggestion. I will see.

1. The software I have made for PS2 keyboard is counting the scan code with every clock delivered by the PS2 key board.
2.Controller I am using isAtmel 89C52 ( 8051 based controller)
#7 21667432 13 Apr 2013 23:13

Debdas Choudhury Debdas Choudhury

Anonymous

Post #7
21667432 13 Apr 2013 23:13

Thank you Sir for your important suggestion about stack overflow.
I have reinitialized the SP with (MOV SP,#5FH ) and the problem is solved.
Thanks again. GOD bless you.
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Topic summary

An assembly language program was developed for an Atmel 89C52 microcontroller to save and read words from a 24C04 I2C EEPROM using data from a PS2 keyboard. The writing process to the EEPROM functions correctly, but during reading, after successfully retrieving several words, the system hangs. The PS2 keyboard input is processed by counting scan codes on each clock pulse. The issue was suspected to be related to stack overflow or insufficient RAM. After reinitializing the stack pointer with the instruction MOV SP,#5FH, the hanging problem was resolved, indicating that proper stack management is critical when interfacing the 89C52 with the 24C04 EEPROM and PS2 keyboard in assembly.
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24C04 I2C EEPROM read issue after several words with 89C52 microcontroller assembly

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Topic summary