Reading data from i2c and storing results in PIC

[Lebelin]

i2c com pic16f84a

I wish to intercept the I2c informations between a microcontroler and a 24lc32, store these infos in the internal 16f84 eeprom to use same (after eventual modifications) on an other ic2 bus.
In fact, the initial system is a microcontroler (which cannot be modified) acting as master of a chain, when an order is given either by button ot IR remote, the necessary infos (channel specifications) are asked to a 24lc32 which after treatments in the controler are used to command various items on the same i2c bus(tuner, LCD etc)
I connected a pic 16f84 on this bus but unfortunately it is impossible to read (and of course store) the 8 octets of the EEprom corresponding to the choising channel.
In any case as the pic is not configured to be a slave or a master no any "STAR","ACK" or "STOP" are sending and cannot be send as i wish only to pick up the infos in parallel.
I used "SHIFTIN" (PicBasicPro) without result.I obtain some infos without any relation with the EEprom Data.
Can any body help me??

Thanks in advance

 

[algilsan]

i2c reading in pic

Step by Step,

You want to spy an I2C bus made betwen a uC and a E2Prom don't you?.

If this is correct you only have to monitoring SDA line, and SCL . So place two buffers betwen bus and you uC. And make a Pulling of SCL line. as soon as it make a change test SDA line, so you can know if there is START condition STOP ACK etc.

i'll hope be useful