I2CWRITE not writing anything on PIC18F45K80

[CuriousOne]

By the way, I have DS3231 hooked to another pins of same CPU.
It also not working - no activity on SDA/SCL pins while performing I2CREAD.
So maybe some config error?

[richard]

So maybe some config error?

if you mean its wiring error or the chips aren't what you say , probably

schematic ?

[CuriousOne]

No, there is no wiring error and when using HIGH or LOW statements, I can pull these pins up and down as normal.
I mean, maybe there is some config error for 18F, which prevents I2CREAD/I2CWRITE from working?

[richard]

to be clear

provided it is wired correctly and the chip is pcf8574 the original code works just fine

[tumbleweed]

Change CONFIG XINST setting to OFF.

Very few compilers are compatible with ON

[CuriousOne]

Yes, you were right!
Also XINST messes with LCDOUT.
When XINST=ON, then DEC/HEX/BIN etc. modifiers of LCDOUT statement do not work.

But why this is not mentioned in manual?
Also, turning off XINST means we're turning off these extended instructions of 18F, so loosing all advantages these series have?

[tumbleweed]

XINST changes the way some instructions work, so unless you have a compiler that supports it (like almost none), always set it off.

You're not missing out on anything.