AVRmega as I2C Slave

i2c eeprom emulation

Marco
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AVRmega as I2C Slave

 ·  Posted: 24.01.2013 - 12:34  ·  #1
Hello,

I need know if I have well understood the way an AVRmega works as slave on an I2C bus.
I see two pipes available for tx and rx to serve the corresponding commands from the master.
I suppose a Master device can read and write into mega Slave addresses as normally done in a serial eeprom locations.
Am I right ?

regards,
Marco
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Re: AVRmega as I2C Slave

 ·  Posted: 26.01.2013 - 22:36  ·  #2
Hello Marco,
this is correct and also not correct.
An AVR slave has to respond immediately for every byte which is received.
A serial comm must not. I don't like any I2C slaves based an a CPU which
then is software driven. Very difficult to handle on both sides. The similar
is true with SPI slaves with AVRs. No buffering, interrupts may destroy the
data transfers etc. My opinion and experience.

rolf
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Re: AVRmega as I2C Slave

 ·  Posted: 31.01.2013 - 11:41  ·  #3
Thank you Rolf,
I'll try to use COM port to avoid I2C...

Regards,
Marco
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