95 lines
3.1 KiB
Groff
95 lines
3.1 KiB
Groff
.TH SIGGEN "9" "2007-01-16" "LinuxCNC Documentation" "HAL Component"
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.SH NAME
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siggen \- signal generator
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.SH SYNOPSIS
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\fBloadrt siggen [num_chan=\fInum\fB | names=\fIname1\fB[,\fIname2...\fB]]
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.SH DESCRIPTION
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\fBsiggen\fR is a signal generator that can be used for testing and
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other applications that need simple waveforms. It produces sine,
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cosine, triangle, sawtooth, and square waves of variable frequency,
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amplitude, and offset, which can be used as inputs to other HAL
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components.
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.P
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\fBsiggen\fR supports a maximum of sixteen channels. The number of
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channels actually loaded is set by the \fBnum_chan\fR argument when
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the module is loaded. Alternatively, specify \fBnames=\fR and unique names
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separated by commas.
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.P
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The \fBnum_chan=\fR and \fBnames=\fR specifiers are mutually exclusive.
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If neither \fBnum_chan=\fR nor \fBnames=\fR are specified, the default
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value is one.
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.SH NAMING
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The names for pins, parameters, and functions are prefixed as:
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\fBsiggen.N.\fR for N=0,1,...,num\-1 when using \fBnum_chan=num\fR
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\fBnameN.\fR for nameN=name1,name2,... when using \fBnames=name1,name2,...\fR
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The \fBsiggen.N.\fR format is shown in the following descriptions.
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.SH FUNCTIONS
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.TP
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\fBsiggen.\fIN\fB.update\fR (uses floating-point)
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Updates output pins for signal generator \fIN\fR. Each time it is
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called it calculates a new sample. It should be called many times
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faster than the desired signal frequency, to avoid distortion and
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aliasing.
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.SH PINS
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.TP
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\fBsiggen.\fIN\fB.frequency\fR float in
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The output frequency for signal generator \fIN\fR, in Hertz. The default
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value is 1.0 Hertz.
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.TP
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\fBsiggen.\fIN\fB.amplitude\fR float in
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The output amplitude for signal generator \fIN\fR. If \fBoffset\fR is
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zero, the outputs will swing from \-\fBamplitude\fR to +\fBamplitude\fR.
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The default value is 1.00.
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.TP
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\fBsiggen.\fIN\fB.offset\fR float in
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The output offset for signal generator \fIN\fR. This value is added
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directly to the output signal. The default value is zero.
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.TP
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\fBsiggen.\fIN\fB.reset\fR bit in
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Resets output pins to pretermined states:
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sine 0
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sawtooth 0
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square -1 * amplitude
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cosine -1 * amplitude
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triangle -1 * amplitude
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.TP
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\fBsiggen.\fIN\fB.clock\fR bit out
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The clock output. Bit type clock signal output at the commanded
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frequency.
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.TP
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\fBsiggen.\fIN\fB.square\fR float out
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The square wave output. Positive while \fBtriangle\fR and \fBcosine\fR
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are ramping upwards, and while \fBsine\fR is negative.
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.TP
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\fBsiggen.\fIN\fB.sine\fR float out
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The sine output. Lags \fBcosine\fR by 90 degrees.
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.TP
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\fBsiggen.\fIN\fB.cosine\fR float out
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The cosine output. Leads \fBsine\fR by 90 degrees.
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.TP
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\fBsiggen.\fIN\fB.triangle\fR float out
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The triangle wave output. Ramps up while \fBsquare\fR is positive, and
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down while \fBsquare\fR is negative. Reaches its positive and negative
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peaks at the same time as \fBcosine\fR.
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.TP
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\fBsiggen.\fIN\fB.sawtooth\fR float out
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The sawtooth output. Ramps upwards to its positive peak, then instantly
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drops to its negative peak and starts ramping again. The drop occurs
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when \fBtriangle\fR and \fBcosine\fR are at their positive peaks, and
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coincides with the falling edge of \fBsquare\fR.
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.SH PARAMETERS
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.P
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None
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