24lc512: i2cread don't work!

[LUCAS1983]

I have the 18f458 20MHz and the 24lc512. I put all the pull-up resitor.But, as you can see in the picture, if I read the eeprom the result is always zero.where is the mystake?
excuse for my English! thanks very much
luca from italy

[LUCAS1983]

the i2cwrite works very very good!!!(I can program but not read the eeprom)
if I use the i2cread to read the pcf8593 memory (time/date) it works...why it doesn't work with the eeproms?
Please help me.it is important...

[BigWumpus]

Please read the documentation !

I think, you need to use WORD-variables for the adress while using such huge EEPROMs !

;-)

I use them too, and i write and read with I2CREAD/I2CWRITE... It's not easy, but it works !

[LUCAS1983]

thanks Wumpus for the help.
But I use a WORD-variables for the adress. If you see the picture the variable B0 is defined as WORD.but it doesn't work!

[LUCAS1983]

I try to change the 4.7K pull-up resistor with a 10K pull-up resistor (I put that on the SCL or on the SDA or on both)... but if I read the EEprom the result is always 0.

[Darrel Taylor]

Do you have Pins 1 & 2 (A0 & A1) tied to ground?
Is Pin 3 (A2) tied to VDD?
Is Pin 7 (WP) tied to ground?

Do not leave any of those pins floating.
<br>