A neater solution might be this comp I just knocked up, which you can
install using comp -install as described here:
http://linuxcnc.org/docs/html/hal_comp.html
The comp can be used to combine two alternate sets of input bits to
one output, or in set of inputs to either of two outputs.
You would need to add swap.0 to the base thread and then connect
step/dir from one stepgen to inA0 and inA1 and the other to inB0 and
inB1, then connect the digital output to the swap pin.
component swap """Takes two sets of inputs A and B (the number is set by
"personality" and defaults to 2) and swaps A for B when the "swap" pin
is high""";
pin in bit inA#[32 : personality] "Input A";
pin in bit inB#[32 : personality] "Input B";
pin out bit outA#[32 : personality] "Output A";
pin out bit outB#[32 : personality] "Output B";
pin in bit swap "Control input";
function _;
license "GPL";
author "Andy Pugh";
option extra_setup;
;;
FUNCTION(_) {
int i;
if (swap) {
for (i = 0; i < personality ; i++){
outA(i) = inB(i);
outB(i) = inA(i);
}
}
else
{
for (i = 0; i < personality ; i++){
outA(i) = inA(i);
outB(i) = inB(i);
}
}
}
EXTRA_SETUP(){
if (personality == 0) personality = 2;
return 0;
}
--
atp
"Torque wrenches are for the obedience of fools and the guidance of wise men"
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