The manual(s) seem to be lacking on charge pump operation and this being my
first foray into the world of CNC I have a couple questions:
1. Does the charge pump run non stop from the time you open EMC till you
close it (or it crashes) or does it stop on E-Stop condition?
2. To add it to my setup do I need to add anything other than the following
4 lines to my machines .hal file:
loadrt charge_pump
net charge-pump <= charge.pump-out
addf charge-pump base-thread
net charge-pump => parport.0.pin-xx-out
My intention is to have the charge pump wait for EMC to be running then
close a contactor supplying the stepper powersupply and the mill control
circuitry. That allows me a single power button (the CPU) as opposed to 2 or
3 and guarantees that only when EMC is control can anything happen and no
sequencing issues (do this then that, then this - ie human error). I may
even add a relay to drop the panel power switch out once the charge pump
engages so that I can't accidentally bump it and upset the OS at all. But I
don't want the mill and power supply to be shutdown completely with the
activation of an "E-Stop" or "Machine Power Off". I only want E-stop to
disable the amplifier enable and the spindle enable, not drop the charge
pump too. So in short - I want the Charge Pump running the moment EMC2
successfully loads, till the moment it closes (purposefully or otherwise).
Am I correct or am I a resident of left field? I am designing my enclosure
right now and don't have a spare mobo available to temporarily fire up EMC2
and see what happens until I finish the enclosure setup, which will kind of
be determined by the functionality of the charge pump...catch 22 anyone?
The Charge Pump component from the CVS repository (GNU GPL truncated for
space) is:
// This is a 'charge-pump' component for EMC2 HAL
// Copyright 2006 Jeff Epler
component charge_pump "Create a square-wave for the 'charge pump' input of
some controller boards";
option singleton yes;
pin out bit out "Square wave if 'enable' is TRUE or unconnected, low if
'enable' is FALSE";
pin in bit enable = TRUE "If FALSE, forces 'out' to be low";
function _ nofp "Toggle the output bit (if enabled)";
license "GPL";
;;
FUNCTION(_) {
if ( enable ) {
out = !out;
} else {
out = 0;
}
}
Not being that well versed in coding (been a very long time) I'm confused.
Do I need to somehow send an enable the charge pump - and how do I go about
doing that automatically as I verbosely stated above?
Thanks.
Greg
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