I2C issues

[andybarrett1]

You Didn't mention pull ups (Downs) on the A0,A1,A2 Lines ?

You did mention pull ups on the SDA,SDL though .

BR
Andy

[rsocor01]

The problem might be with the PCF8574 chip. The datasheet that I downloaded says that it works at 100 kHz. If your clock works at 400 kHz that might be a problem. Try configuring the I2C interface at 100 kHz only. Try this line at the beginning of the program,

DEFINE I2C_SLOW 1