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.