different sampleus time for three ADCs

[luisfe]

That of C based compiler was a joke for which I expected some reaction, but nobody told anything!

[Art]

[reaction]
That’s a great idea, I’d recommend Microchip C-30 for exactly that reason among others.
PBP is very well documented, however you’ll notice all examples of command use are also examples of exactly how not to write a cyclic program.
ie. a program that gives the illusion of simultaneity.
[/reaction]
If it’s a cyclic program that will be broken if delayed, have you considered an external ADC chip? Not that I’ve used one.