24lc512: i2cread don't work!

[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.
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[LUCAS1983]

i have pin1 and pin2 to and pin3 and pin7 to gnd.
why you say that i should have pin3 to VDD? the address is:
$A0=%10100000 the data sheet says (show attach file) that I have pin1,2,3 to GND

[Darrel Taylor]

Sorry, I was looking at the 24LC515 datasheet instead of the 512.

You should be ok wired that way.
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