Lpc2000

Well.. I have tested the I2C memory with a PIC, and it's not working
either, so the problem is the memory... 
Thanks very much
Ezequiel

--- In lpc2000@yahoogroups.com, "DG (dee-gee)" <dgacina@y...> wrote:
> 
>    Your problem is perhaps the most common one: You are rushing
> to write data (the next byte) into EEPROM without waiting for
> EEPROM to acknowledge that writing is done (of previous byte).
>    Your program has to wait till I2C writing sequence is done,
> because write cycle takes some time. That "done" condition is
> placed onto I2C bus by slave I2C device (in this case EEPROM)
> and your program (the master) has to poll the bus in order to
> sense that condition. That condition is called ACK (as of
> "acknowledged"). If EEPROM cannot write for some reason, it
> places NAK condition on the bus (as of "not acknowledged").
> You are suppose to implement procedures to sense both conditions
> in your program. 
>    There is no other way to recognize the end of writing
> condition except doing polling (as opposite of having interrupts),
> so you have to implement polling sequence in your program where
> writing the subsequent byte into EEPROM can occur only after
> polling procedure has correctly recognized the "writing done"
> (i.e. either ACK or NAK, where ACK means "writing was OK" and
> "NAK" means "writing failed") condition on the I2C bus.
>    Since errant I2C condition could stall the bus, you may also
> consider time-out implementation on the master side. 
> 
> -- D.G.
> 
> 
> 
> --- In lpc2000@yahoogroups.com, "acetoel" <acetoel@y...> wrote:
> > 
> > hello... I have connected a 24LC04 to a LPC2106, used the library
> > SPI.ZIP that is in the section files. The VCC for the memory is 5V,
> > and the SCL and SDA were tided with 10K resistors to 5V (LPC 
> Should be
> > 5V tolerant). The SCL freq is 75KHz. Don't know why my program 
> stops
> > when writing to the memory... any help, or consideration I must 
> remember? 
> > Perhaps somebody experienced something like this before...
> > Thanks
> > Ezequiel