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// This is a component for EMC2 HAL
// Copyright 2007 John Kasunich <jmkasunich AT sourceforge DOT net>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
component knob2float "Convert counts (probably from an encoder) to a float value";
pin in s32 counts "Counts";
pin in bit enable "When TRUE, output is controlled by count, when FALSE, output is fixed";
pin in float scale "Amount of output change per count";
pin out float out "Output value";
param rw float max_out=1.0 "Maximum output value, further increases in count will be ignored";
param rw float min_out=0.0 "Minimum output value, further decreases in count will be ignored";
option data knob2float_data;
function _;
license "GPL";
;;
typedef struct {
long old_counts;
double old_out;
} knob2float_data;
FUNCTION(_) {
long delta_counts;
double tmp_out;
if ( min_out > max_out ) {
min_out = max_out;
}
delta_counts = counts - data.old_counts;
if ( enable ) {
tmp_out = data.old_out + delta_counts * scale;
if ( tmp_out > max_out ) {
data.old_out = max_out;
} else if ( tmp_out < min_out ) {
data.old_out = min_out;
} else {
data.old_out = tmp_out;
}
}
out = data.old_out;
data.old_counts += delta_counts;
}
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