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I2C 24C02 Eeprom Read / Write Issues
Posted by: eliotroyano ()
Date: June 29, 2014 09:18PM

Hi friends. I have been trying to interact with an 24C02 serial eeprom located in an automotive ECU. It is paired with an AN87C196 MCU through an I2c bus. In 24C02 A0 --> A1 (pins 1 to 3) address locations are zero (grounded) all time and pin #7 is grounded too.

Here is an example of it connection with MCU --> https://www.mediafire.com/convkey/74fc/d0wb3c5l6h11zog4g.jpg

I have tryied several methods and circuits (serial circuits basically) but with out luck. Some times I receive bus busy or hardware error [-11] error others it just hang or get waiting forever. Then friends what do you recommend me to solve my issue?

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Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: sonix ()
Date: June 30, 2014 09:59PM

Hi eliotroyano,

at this moment there are too less information to give you a helpful answer.

1. Which connection between the SI-Prog and the computer is used (serial, parallel...) ?
2. Which version of PonyProg do you have ?
3. What is the result message from PonyProg basic I/O port diagnostics (menu "Setup>Interface Setup>Probe) ?
4. Is the eeprom (not in the original circuit) connected through the "I2C Bus eeprom adapter" from ponyprog site below ?
5. Have you tried to read/write another i2c eeprom ?

http://www.lancos.com/siprogsch.html


Best regards

sonix



eliotroyano Wrote:
-------------------------------------------------------
> Hi friends. I have been trying to interact with an
> 24C02 serial eeprom located in an automotive ECU.
> It is paired with an AN87C196 MCU through an I2c
> bus. In 24C02 A0 --> A1 (pins 1 to 3) address
> locations are zero (grounded) all time and pin #7
> is grounded too.
>
> Here is an example of it connection with MCU -->
> https://www.mediafire.com/convkey/74fc/d0wb3c5l6h1
> 1zog4g.jpg
>
> I have tryied several methods and circuits (serial
> circuits basically) but with out luck. Some times
> I receive bus busy or hardware error [-11] error
> others it just hang or get waiting forever. Then
> friends what do you recommend me to solve my
> issue?

Options: ReplyQuote
Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: eliotroyano ()
Date: July 01, 2014 01:14PM

Hi sonix I understand you, there is no too much info about this topic.
Ok here are my answers:

1. Which connection between the SI-Prog and the computer is used (serial, parallel...) ?
I have been trying with some serial programmers like this one --> http://sodoityourself.com/hacking-ibm-thinkpad-bios-password/ or this
http://www.llamma.com/xbox/Repairs/Reading_Xbox_Hdd_key.htm
I also I tryied using a GQ-3X programmer without luck.

2. Which version of PonyProg do you have ?
I have been using the last one in the download page, V2.07c.

3. What is the result message from PonyProg basic I/O port diagnostics (menu "Setup>Interface Setup>Probe) ?
Using the first circuit I got test failed. But with the second one with DB9 pins 6 and 7 connected I got Test OK!!!.

4. Is the eeprom (not in the original circuit) connected through the "I2C Bus eeprom adapter" from ponyprog site below ?
No the eeprom is in it original circuit, matched to it MCU. My idea is to avoid desolder-solder avoinding continuos iteractions. In other words I need an ISP interface for that I2C eeprom.

5. Have you tried to read/write another i2c eeprom ?
Just with the GQ-3x programmer. But it work quite good.

http://www.lancos.com/siprogsch.html

Options: ReplyQuote
Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: sonix ()
Date: July 01, 2014 06:10PM

Hi eliotroyano,

I think, there are two possibilities why the communication from/to programmer is not functional. The supply voltage of the eeprom and also the voltage level on the i2c bus are lower then the programmer needs for proper function. And the second option is the collision of data on the bus due simultaneous communication from/to an AN87C196 MCU. You can try to interrupt SCL and SDA wires to MCU and then to communicate with the eeprom, but I recommend you to read / write the eeprom externally (not in original circuit) with the programmer. In this case don't forget to supply the eeprom with 5V on the Vcc, pins 1-4 and 7 to GND if you would like to use the simple programmers (2 resistors, 2 zener diodes and db9 rs232 connector) as you have tried.

Best regards

sonix

eliotroyano Wrote:
-------------------------------------------------------
> Hi sonix I understand you, there is no too much
> info about this topic.
> Ok here are my answers:
>
> 1. Which connection between the SI-Prog and the
> computer is used (serial, parallel...) ?
> I have been trying with some serial programmers
> like this one -->
> http://sodoityourself.com/hacking-ibm-thinkpad-bio
> s-password/ or this
> http://www.llamma.com/xbox/Repairs/Reading_Xbox_Hd
> d_key.htm
> I also I tryied using a GQ-3X programmer without
> luck.
>
> 2. Which version of PonyProg do you have ?
> I have been using the last one in the download
> page, V2.07c.
>
> 3. What is the result message from PonyProg basic
> I/O port diagnostics (menu "Setup>Interface
> Setup>Probe) ?
> Using the first circuit I got test failed. But
> with the second one with DB9 pins 6 and 7
> connected I got Test OK!!!.
>
> 4. Is the eeprom (not in the original circuit)
> connected through the "I2C Bus eeprom adapter"
> from ponyprog site below ?
> No the eeprom is in it original circuit, matched
> to it MCU. My idea is to avoid desolder-solder
> avoinding continuos iteractions. In other words I
> need an ISP interface for that I2C eeprom.
>
> 5. Have you tried to read/write another i2c eeprom
> ?
> Just with the GQ-3x programmer. But it work quite
> good.
>
> http://www.lancos.com/siprogsch.html

Options: ReplyQuote
Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: eliotroyano ()
Date: July 01, 2014 06:28PM

sonix Wrote:
-------------------------------------------------------
> Hi eliotroyano,
>
> I think, there are two possibilities why the
> communication from/to programmer is not
> functional. The supply voltage of the eeprom and
> also the voltage level on the i2c bus are lower
> then the programmer needs for proper function. And
> the second option is the collision of data on the
> bus due simultaneous communication from/to an
> AN87C196 MCU. You can try to interrupt SCL and SDA
> wires to MCU and then to communicate with the
> eeprom, but I recommend you to read / write the
> eeprom externally (not in original circuit) with
> the programmer. In this case don't forget to
> supply the eeprom with 5V on the Vcc, pins 1-4 and
> 7 to GND if you would like to use the simple
> programmers (2 resistors, 2 zener diodes and db9
> rs232 connector) as you have tried.
>
> Best regards
>
> sonix
>
> eliotroyano Wrote:
> --------------------------------------------------
> -----
> > Hi sonix I understand you, there is no too much
> > info about this topic.
> > Ok here are my answers:
> >
> > 1. Which connection between the SI-Prog and the
> > computer is used (serial, parallel...) ?
> > I have been trying with some serial programmers
> > like this one -->
> >
> http://sodoityourself.com/hacking-ibm-thinkpad-bio
>
> > s-password/ or this
> >
> http://www.llamma.com/xbox/Repairs/Reading_Xbox_Hd
>
> > d_key.htm
> > I also I tryied using a GQ-3X programmer
> without
> > luck.
> >
> > 2. Which version of PonyProg do you have ?
> > I have been using the last one in the download
> > page, V2.07c.
> >
> > 3. What is the result message from PonyProg
> basic
> > I/O port diagnostics (menu "Setup>Interface
> > Setup>Probe) ?
> > Using the first circuit I got test failed. But
> > with the second one with DB9 pins 6 and 7
> > connected I got Test OK!!!.
> >
> > 4. Is the eeprom (not in the original circuit)
> > connected through the "I2C Bus eeprom adapter"
> > from ponyprog site below ?
> > No the eeprom is in it original circuit,
> matched
> > to it MCU. My idea is to avoid desolder-solder
> > avoinding continuos iteractions. In other words
> I
> > need an ISP interface for that I2C eeprom.
> >
> > 5. Have you tried to read/write another i2c
> eeprom
> > ?
> > Just with the GQ-3x programmer. But it work
> quite
> > good.
> >
> > http://www.lancos.com/siprogsch.html

Sonix thanks for your fast replay. I understand that easier option is to take out the eeprom from the circuit. I have do it in the past with sucess. But to avoid doing it several times, I ask for the ISP option.

During my test I saw that Vcc voltage of 24C02 is 4.75V and not 5V as you mention. But I don't think that 4,75V as VCC for the serial eeprom should be a problem due that MCU read and write it with that low voltage.

Ok then to avoid MCU uses the I2C bus (collision data) I have read about a trick to avoid MCU start. Connecting a wire between MCU Xtal pads I could energize all circuit but avoid that MCU start and also communicate with serial eeprom. What do you think?

Options: ReplyQuote
Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: sonix ()
Date: July 01, 2014 07:33PM

Hi eliotroyano,

connecting a wire between MCU Xtal pads is acceptable to avoid MCU to start executing its program. Then you could try to read / write the eeprom with the programmer.

P.S: Vcc voltage 4.75V is OK.

Best regards

sonix

eliotroyano Wrote:
-------------------------------------------------------
> sonix Wrote:
> --------------------------------------------------
> -----
> > Hi eliotroyano,
> >
> > I think, there are two possibilities why the
> > communication from/to programmer is not
> > functional. The supply voltage of the eeprom
> and
> > also the voltage level on the i2c bus are lower
> > then the programmer needs for proper function.
> And
> > the second option is the collision of data on
> the
> > bus due simultaneous communication from/to an
> > AN87C196 MCU. You can try to interrupt SCL and
> SDA
> > wires to MCU and then to communicate with the
> > eeprom, but I recommend you to read / write the
> > eeprom externally (not in original circuit)
> with
> > the programmer. In this case don't forget to
> > supply the eeprom with 5V on the Vcc, pins 1-4
> and
> > 7 to GND if you would like to use the simple
> > programmers (2 resistors, 2 zener diodes and
> db9
> > rs232 connector) as you have tried.
> >
> > Best regards
> >
> > sonix
> >
> > eliotroyano Wrote:
> >
> --------------------------------------------------
>
> > -----
> > > Hi sonix I understand you, there is no too
> much
> > > info about this topic.
> > > Ok here are my answers:
> > >
> > > 1. Which connection between the SI-Prog and
> the
> > > computer is used (serial, parallel...) ?
> > > I have been trying with some serial
> programmers
> > > like this one -->
> > >
> >
> http://sodoityourself.com/hacking-ibm-thinkpad-bio
>
> >
> > > s-password/ or this
> > >
> >
> http://www.llamma.com/xbox/Repairs/Reading_Xbox_Hd
>
> >
> > > d_key.htm
> > > I also I tryied using a GQ-3X programmer
> > without
> > > luck.
> > >
> > > 2. Which version of PonyProg do you have ?
> > > I have been using the last one in the
> download
> > > page, V2.07c.
> > >
> > > 3. What is the result message from PonyProg
> > basic
> > > I/O port diagnostics (menu "Setup>Interface
> > > Setup>Probe) ?
> > > Using the first circuit I got test failed.
> But
> > > with the second one with DB9 pins 6 and 7
> > > connected I got Test OK!!!.
> > >
> > > 4. Is the eeprom (not in the original
> circuit)
> > > connected through the "I2C Bus eeprom
> adapter"
> > > from ponyprog site below ?
> > > No the eeprom is in it original circuit,
> > matched
> > > to it MCU. My idea is to avoid
> desolder-solder
> > > avoinding continuos iteractions. In other
> words
> > I
> > > need an ISP interface for that I2C eeprom.
> > >
> > > 5. Have you tried to read/write another i2c
> > eeprom
> > > ?
> > > Just with the GQ-3x programmer. But it work
> > quite
> > > good.
> > >
> > > http://www.lancos.com/siprogsch.html
>
> Sonix thanks for your fast replay. I understand
> that easier option is to take out the eeprom from
> the circuit. I have do it in the past with sucess.
> But to avoid doing it several times, I ask for the
> ISP option.
>
> During my test I saw that Vcc voltage of 24C02 is
> 4.75V and not 5V as you mention. But I don't think
> that 4,75V as VCC for the serial eeprom should be
> a problem due that MCU read and write it with that
> low voltage.
>
> Ok then to avoid MCU uses the I2C bus (collision
> data) I have read about a trick to avoid MCU
> start. Connecting a wire between MCU Xtal pads I
> could energize all circuit but avoid that MCU
> start and also communicate with serial eeprom.
> What do you think?

Options: ReplyQuote
Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: imtiaz_2007 ()
Date: August 19, 2014 07:03AM

help me
new and ok software for
DVD Spi-Flash-Programmer

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Re: I2C 24C02 Eeprom Read / Write Issues
Posted by: sonix ()
Date: August 20, 2014 07:54PM

Hello imtiaz_2007,

specify your question more, please.

For start it would be helpful to know what kind of chip (product number) do you want to program.

Best regards

Sonix



imtiaz_2007 Wrote:
-------------------------------------------------------
> help me
> new and ok software for
> DVD Spi-Flash-Programmer

Options: ReplyQuote


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