I2CWRITE not writing anything on PIC18F45K80

[CuriousOne]

Hello.
I have PCF8574 connected to PIC18F45K80.
The timings and configs are correct, tried to generate some pulses and frequencies are correct.
Tried just to pull up and down SDA/SCL pins and check result with scope, while having PCF8574 connected - I can see proper pulses on the scope.
However, when I try to I2CWRITE, I see no activity at all on either SDA or SCL pins, and sure does not work. Adding I2C SLOW does not change anything.

Here's my code:

#config
CONFIG RETEN = OFF	
CONFIG INTOSCSEL = HIGH
CONFIG SOSCSEL = DIG
CONFIG XINST = ON	    ;Enabled
CONFIG FOSC = INTIO1
CONFIG PLLCFG = OFF
CONFIG FCMEN = OFF	    ;Disabled
CONFIG PWRTEN = OFF	    ;Disabled
CONFIG BOREN = OFF	    ;Disabled in hardware, SBOREN disabled
CONFIG WDTEN = OFF	    ;WDT disabled in hardware; SWDTEN bit disabled
CONFIG CANMX = PORTB
CONFIG MCLRE = OFF


#endconfig


'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 16
DEFINE I2C_SLOW 1
ADR VAR BYTE
ADR=$48


SDA VAR PORTD.3
SCL VAR PORTD.2


'dfe:
'high sda
'pause 1
'low sda
'pause 1
'goto dfe


FEDO:
I2CWRITE SDA,SCL,ADR,[%11111111]
PAUSE 50
I2CWRITE SDA,SCL,ADR,[%00000000]
PAUSE 50
GOTO FEDO

[Ioannis]

I think you are missing the control before the address of the I2C commands.

Also DEFINE I2C_SLOW 1 is NOT needed.

try this

Cont = %01000000

I2CWRITE SDA,SCL,Cont,[%11111111]
PAUSE 500
I2CWRITE SDA,SCL,Cont,[%00000000]
pause 500


Ioannis

[CuriousOne]

And where to put address?
I have several PCFs....

[Ioannis]

OK, in the cont constant will be the address. What chip do you have? Is it the "A" type?

The "A" type needs cont=%0111AAA0

The plain PCF8574 needs cont=%01000AAA0

where AAA is the address bits.

Ioannis

[richard]

provided it is wired correctly and the chip is pcf8574 the original code works just fine
although technically
TRISD=%00000000 'set PORTD as output all
should be
TRISD=%00001100 'set PORTD

[CuriousOne]

The chips are PCF8574T.
I have pull up resistors 4.7K and SDA and SCL pins of 3 pcs. PCF chips are in parallel.
I tried adding that cont variable and changing TRIS for D port pins. Still nothing.
On the startup, SCL gets high and that's all, there is no activity on these pins.
But if I run simple high/low statements for those pins, then I can see these pins getting high or low on scope.

[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