Comments on: Easy 24C I2C Serial EEPROM Interfacing with AVR Microcontrollers

By: Vince

Vince — Sat, 28 Apr 2012 00:19:25 +0000

I’m using an ATmega8 dev board running at 16 MHz and I thought it got stuck at “Writing…” as well but after about 2 or 3 minutes I see “Write Success!” Just took a long time to fill all data I guess or check that your uCntlr clock frequency is correct.

By: Khan

Khan — Mon, 05 Mar 2012 17:48:38 +0000

program halts at “Writing”…copied the exact program and ran the simulations in proteus.

Anyone knowing the reason?

By: Ananya

Ananya — Fri, 20 Jan 2012 06:42:33 +0000

Thanks for your tutorial and code ! Its wonderful and helpful and I was able to simulate in proteus successfully !!! But with CPU and crystal frequency set to 16 MHZ, I get a statement
I2C MEM TIMING: start setup time violated.Clock positive edge was at 223.29m Hold time is 4u minimum hold time is 1.25u
and similarly
I2C MEM TIMING: stop setup time violated.Clock positive edge was at 223.396m Setup time is 1.25u minimum time is 4.7u…
But if the same simulation is executed with 4MHz clock frequency set those statements are elimnated…. The final output is obtained in both the frequencies… but my questiion is how does this happen??? when u r CPU frequency changes SCL frequency also changes but the data transfer is taking place in both the cases.. please enlighten me… asap !!!

By: Ananya

Ananya — Fri, 30 Dec 2011 15:28:44 +0000

How about interfacing LCD using I2C with ATMEGA32??? Can you enlighten me on that

By: Mr.P

Mr.P — Wed, 14 Dec 2011 09:50:18 +0000

Hi Avinash,

Thank you so much for nice tutorial and I subscribe your web also.

Regards.
Mr.P

By: Software I2C Library for AVR MCUs | eXtreme Electronics

Software I2C Library for AVR MCUs | eXtreme Electronics — Thu, 24 Nov 2011 07:25:25 +0000

[...] bus used to connect a variety of external peripheral with a microcontroller. Most common are EEPROMs, RTC, Port Expanders etc. Most leading MCUs comes with at least one dedicated I2C host adaptor [...]

By: Chris

Chris — Wed, 30 Mar 2011 03:27:44 +0000

Thanks for this wonderfull turorial , I am working on project where my IO is very limited, this is perfect as I will be storing a large structure in the memory which wont change that often so E2 is perfect for this.

By: Sayantan

Sayantan — Thu, 10 Feb 2011 18:51:56 +0000

hey av,can i just use 24c128 eeprom with your functions.i mean are the functions built for only 24c64 eeprom or for all 24cxx series eeprom?

By: Interfacing external memory with avr

Interfacing external memory with avr — Fri, 19 Nov 2010 15:40:12 +0000

[...] external memory with avr Refer "similar threads" below AVR and external memory Easy 24C I2C Serial EEPROM Interfacing with AVR Microcontrollers | eXtreme Electronics Reply With Quote View [...]

By: Avinash

Avinash — Sat, 03 Jul 2010 03:59:54 +0000

@AVR Lab

You have not provided any link to the original source?

Please provide a link to this page.

By: AvrLabCom

AvrLabCom — Thu, 01 Jul 2010 07:03:29 +0000

Thank for this Library, i using it on my projects.
Here is I post your library with comments on russian on my own site.
http://avrlab.com/node/84

By: belkacem

belkacem — Wed, 19 May 2010 02:31:17 +0000

Thanks my frind

By: biswajit

biswajit — Thu, 25 Mar 2010 19:28:02 +0000

its there in your code. if anything wrong plz send me the exact code. my id is paltu4u@gmail.com

By: Avinash

Avinash — Wed, 24 Mar 2010 10:49:54 +0000

i have one doubt that why u have used a dummy writing sequence inside the function readbyte().

See 24Cxx datasheet. It is required .

By: biswajit

biswajit — Wed, 24 Mar 2010 08:40:36 +0000

dear avinash ,
i have gone through ur code and its working fine. i have one doubt that why u have used a dummy writing sequence inside the function readbyte().
and one more doubt isi have written 0x0A address with some value but all locations including 0xA0 shows the same value. what is the reason ?
plz reply me soon.

By: vinod

vinod — Tue, 16 Mar 2010 00:32:05 +0000

hi i’m vinod a final b.e student .i’m using a 24c32serial eeprom in my project iwant to know whether the eeprom cn erased by using code if so can i get what instructiona to be used

By: burhan

burhan — Fri, 26 Feb 2010 12:11:52 +0000

hi avinash!

great tutorial, now i want to interface EEPROm with LPC 2148 controller can you help me for that?

By: nazat shaikh

nazat shaikh — Sat, 13 Feb 2010 09:45:00 +0000

hi,
i tried reading RTC registers after every 1sec but it fails to update time on LCD. At power on-reset only once it display the time but after it is not updating time. Please help me.
thank u

By: R.Prem Sunder

R.Prem Sunder — Tue, 26 Jan 2010 07:13:22 +0000

Hi Avinash!

Your EEPROM libraries are awesome! I am new to AVR’s though I have worked in PIC n 8051! But from scratch I could learn AVRs in a week!!! Thanks to all your efforts to build code libraries and projects that teaches a novice end to end in a short span of time!!! All the contents you have given are so useful, that I am working on a product with all the support libraries and schematics you have furnished in your site.

By: sridhar

sridhar — Sat, 09 Jan 2010 05:37:28 +0000

Dear sir,
I am using AVR micro controller, atmega 16, in need to communicate TWi interface with other micro controller,
I am using code vision for the complier.
I tried the code which is given in atmel application 311,312, etc but it was not working may be I could not properly analyze,
So, I built the RTC interface for DS1307 it was working with the Code vision in built library , so I have taken only the read format of the RTC and I tried to implement the slave,
With
START();
Write address();
Start();
Write location();
data=read data();
Return data;
By this code I was able to get data from the RTC,
So I thought to go with reverse engineering/programming to send a data to the master as the slave microcontroller need to act as RTC for only this particular code, but still it is not working,
Please if u have any such general implication of the i2c master and slave code please help me,