I2CWRITE not writing anything on PIC18F45K80

[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.

[CuriousOne]

I've compared this code on 16F1939 @ 16 Mhz and 18F45K80 @ 64 Mhz and see zero improvement in speed (screen redraw time). I'm doing something wrong, or it should be that way? Here's config for 18F:

OSCTUNE.6 = 1 ; Enable 4x PLL
OSCCON = %01110000
ANCON1=0 'DISABLE ADC D3-D2-D1-D0-
ANCON0=0
ADCON0=0
TRISC=%00000000 'set PORTC as output all
TRISD=%00000000 'set PORTD as output all
TRISB=%00000000 'set PORTB as output all
TRISA=%00000000 'set PORTA 2 as input, others as output
TRISE=%0000000  'set PORTE as output all
define OSC 64

And this is the main code (ST7920 library with custom fonts)

topline	var byte [18]
arraywrite topline, ["SOMETEXT HERE  123"]
C=0
gosub GCODER
arraywrite topline, ["SOMETEXT HERE  567"]
c=8
gosub gcoder
arraywrite topline, ["SOMETEXT HERE  890"]
c=16
gosub gcoder
C=24
arraywrite topline, ["SOMETEXT HERE  XXX"]
GOSUB GCODER
stop




GCODER:
FOR X=0 TO 17 step 2	'READ ARRAY INTO VARIABLE, ARRAY MEMBER CHAR=EEPROM OFFSET	
Y=(topline[x]-65)*8
Z=(topline[x+1]-65)*8 'READ  INTO VARIABLE AS TWINS
FOR I=0 TO 7	'HELPER LOOP FOR CHARACTER READING
READ Y+I,A 'READ EEPROM BYTES INTO VAR
READ Z+I,B
LCDOUT $FE,$80+i+c 'UPDATE Y POSITION
LCDOUT $FE,$80+x/2 'UPDATE X POSITION
if topline[x]=32 then a=0
if topline[x+1]=32 then b=0 'blanker
LCDOUT a
LCDOUT b 'WRITE TO SCREEN
NEXT I
NEXT X
return

[tumbleweed]

It could be that the LCDOUT dominates the execution time, although I'd be surprised if it's "0 difference"

Do you still have CONFIG FOSC = INTIO1?
With that, you can measure the CLKOUT on the RA6/OSC2 pin just to verify the settings.