doc: A few whitespace tweaks in program listings
This commit is contained in:
Ian Abbott
parent
c938e2bf60
commit
5fdc15c302
2 changed files with 176 additions and 167 deletions
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@ -104,7 +104,8 @@
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* This prepares a command in a pretty generic way. We ask the
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* library to create a stock command that supports periodic
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* sampling of data, then modify the parts we want. */
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int prepare_cmd_lib(comedi_t *dev, int subdevice, int n_scan, int n_chan, unsigned scan_period_nanosec, comedi_cmd *cmd)
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int prepare_cmd_lib(comedi_t *dev, int subdevice, int n_scan, int n_chan,
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unsigned scan_period_nanosec, comedi_cmd *cmd)
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{
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int ret;
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340
doc/other.xml
340
doc/other.xml
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@ -1,6 +1,6 @@
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<?xml version="1.0" encoding="utf-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % comedilib_entities SYSTEM "comedilib.ent">
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%comedilib_entities;
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]>
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@ -58,8 +58,10 @@ digital subdevices on a particular board.
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Individual bits on a digital I/O device can be read and written using
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the functions
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<programlisting>
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int <link linkend="func-ref-comedi-dio-read">comedi_dio_read</link>(device,subdevice,channel,unsigned int *bit);
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int <link linkend="func-ref-comedi-dio-write">comedi_dio_write</link>(device,subdevice,channel,unsigned int bit);
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int <link linkend="func-ref-comedi-dio-read">comedi_dio_read</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice, unsigned int channel,
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unsigned int *bit);
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int <link linkend="func-ref-comedi-dio-write">comedi_dio_write</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice, unsigned int channel,
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unsigned int bit);
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</programlisting>
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The <parameter class="function">device</parameter> parameter is a
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<link linkend="ref-type-comedi-t">pointer</link>
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@ -74,7 +76,8 @@ contains the value of the acquired bit.
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The direction of bidirectional lines can be configured using
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the function
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<programlisting>
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<link linkend="func-ref-comedi-dio-config">comedi_dio_config</link>(device,subdevice,channel,unsigned int dir);
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int <link linkend="func-ref-comedi-dio-config">comedi_dio_config</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice, unsigned int channel,
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unsigned int dir);
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</programlisting>
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The parameter <parameter class="function">dir</parameter> should be
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either <literal>COMEDI_INPUT</literal> or
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@ -88,7 +91,8 @@ the entire block.
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Multiple channels can be read and written simultaneously using the
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function
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<programlisting>
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<link linkend="func-ref-comedi-dio-bitfield">comedi_dio_bitfield</link>(device,subdevice,unsigned int write_mask,unsigned int *bits);
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int <link linkend="func-ref-comedi-dio-bitfield">comedi_dio_bitfield</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice,
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unsigned int write_mask, unsigned int *bits);
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</programlisting>
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Each channel is assigned to a bit in the
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<parameter class="function">write_mask</parameter> and
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@ -131,25 +135,26 @@ the range of, typically, <literal>8</literal>, <literal>10</literal>,
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<para>
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The
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<programlisting>
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int <link linkend="func-ref-comedi-data-read">comedi_data_read</link>(<link linkend="ref-type-comedi-t">comedi_t</link> * device, unsigned int subdevice, unsigned int channel,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> * data);
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int <link linkend="func-ref-comedi-data-read">comedi_data_read</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice, unsigned int channel,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> * data);
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</programlisting>
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function reads one such data value from a &comedi; channel, and puts it in
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the user-specified <parameter>data</parameter> buffer. The
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<programlisting>
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int <link linkend="func-ref-comedi-data-write">comedi_data_write</link>(<link linkend="ref-type-comedi-t">comedi_t</link> * device, unsigned int subdevice, unsigned int channel,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> data);
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int <link linkend="func-ref-comedi-data-write">comedi_data_write</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice, unsigned int channel,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> data);
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</programlisting>
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works in the opposite direction. Data values returned by this function
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are unsigned integers less than, or equal to, the maximum sample value
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of the channel, which can be determined using the function
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<programlisting>
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<link linkend="ref-type-lsampl-t">lsampl_t</link> <link linkend="func-ref-comedi-get-maxdata">comedi_get_maxdata</link>(<link linkend="ref-type-comedi-t">comedi_t</link> * device, unsigned int subdevice, unsigned int channel);
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<link linkend="ref-type-lsampl-t">lsampl_t</link> <link linkend="func-ref-comedi-get-maxdata">comedi_get_maxdata</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice,
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unsigned int channel);
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</programlisting>
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Conversion of data values to physical units can be performed by the
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function
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<programlisting>
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double <link linkend="func-ref-comedi-to-phys">comedi_to_phys</link>(<link linkend="ref-type-lsampl-t">lsampl_t</link> data, comedi_range * range, <link linkend="ref-type-lsampl-t">lsampl_t</link> maxdata);
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double <link linkend="func-ref-comedi-to-phys">comedi_to_phys</link>(<link linkend="ref-type-lsampl-t">lsampl_t</link> data, comedi_range * range, <link linkend="ref-type-lsampl-t">lsampl_t</link> maxdata);
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</programlisting>
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There are two data structures in these commands that are not fully
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self-explanatory:
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@ -188,8 +193,8 @@ function call are checked. If multiple acquisitions must be done on
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the same channel, this overhead can be avoided by using a function
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that can read more than one sample:
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<programlisting>
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int <link linkend="func-ref-comedi-dio-read">comedi_data_read_n</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, unsigned int subdev, unsigned int chan, unsigned int range,
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unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> *data, unsigned int n)
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int <link linkend="func-ref-comedi-data-read-n">comedi_data_read_n</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, unsigned int subdev, unsigned int chan,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> *data, unsigned int n);
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</programlisting>
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The number of samples, <parameter class="function">n</parameter>, is
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limited by the &comedi; implementation (to a maximum of 100 samples),
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@ -199,8 +204,9 @@ because the call is blocking.
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The start of the data acquisition can also be delayed by a specified
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number of nano-seconds:
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<programlisting>
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int <link linkend="func-ref-comedi-data-read-delayed">comedi_data_read_delayed</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, unsigned int subdev, unsigned int chan, unsigned int range,
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unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> *data, unsigned int nano_sec)
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int <link linkend="func-ref-comedi-data-read-delayed">comedi_data_read_delayed</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, unsigned int subdev, unsigned int chan,
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unsigned int range, unsigned int aref, <link linkend="ref-type-lsampl-t">lsampl_t</link> *data,
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unsigned int nano_sec);
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</programlisting>
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All these read and write acquisition functions are implemented on top
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of the generic <link linkend="instructions">instruction</link>
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@ -245,7 +251,7 @@ All the information needed to execute an instruction is stored in the
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<link linkend="ref-type-comedi-insn">comedi_insn</link>
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data structure:
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<programlisting>
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struct <anchor id="insn-data-structure"/>comedi_insn_struct{
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struct <anchor id="insn-data-structure"/>comedi_insn_struct {
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<anchor id="insn-data-structure-insn"/>unsigned int insn; // integer encoding the type of acquisition
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// (or configuration)
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unsigned int n; // number of elements in data array
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@ -317,7 +323,7 @@ Instruction execution
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Once an instruction data structure has been filled in, the
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corresponding instruction is executed as follows:
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<programlisting>
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int <link linkend="func-ref-comedi-do-insn">comedi_do_insn</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, <link linkend="ref-type-comedi-insn">comedi_insn</link> * instruction);
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int <link linkend="func-ref-comedi-do-insn">comedi_do_insn</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, <link linkend="ref-type-comedi-insn">comedi_insn</link> *instruction);
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</programlisting>
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Many &comedi; instructions are shortcuts that relieve the programmer
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from explicitly filling in the data structure and calling the
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@ -327,7 +333,7 @@ function.
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<para>
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The
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<programlisting>
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int <link linkend="func-ref-comedi-do-insnlist">comedi_do_insnlist</link><link linkend="ref-type-comedi-t">comedi_t</link> *it, <link linkend="ref-type-comedi-insnlist">comedi_insnlist</link> * list)
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int <link linkend="func-ref-comedi-do-insnlist">comedi_do_insnlist</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *it, <link linkend="ref-type-comedi-insnlist">comedi_insnlist</link> *list)
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</programlisting>
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instruction allows to perform a list of instructions in one function
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call. The number of instructions in the list is limited in the
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@ -580,7 +586,7 @@ Executing a command
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<para>
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A commands is executed by the following &comedi; function:
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<programlisting>
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int <link linkend="func-ref-comedi-command">comedi_command</link>(<link linkend="ref-type-comedi-t">comedi_t</link> * device, <link linkend="ref-type-comedi-cmd">comedi_cmd</link> * command);
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int <link linkend="func-ref-comedi-command">comedi_command</link>(<link linkend="ref-type-comedi-t">comedi_t</link> *device, <link linkend="ref-type-comedi-cmd">comedi_cmd</link> *command);
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</programlisting>
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The following sections explain the meaning of the
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<link linkend="ref-type-comedi-cmd">comedi_cmd</link> data structure.
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@ -618,7 +624,7 @@ acquisition, which is stored in the
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<programlisting>
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typedef struct comedi_cmd_struct comedi_cmd;
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struct comedi_cmd_struct{
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struct comedi_cmd_struct {
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unsigned int subdev; // which subdevice to sample
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unsigned int <anchor id="command-data-struct-flags"/>flags; // encode some configuration possibilities
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// of the command execution; e.g.,
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@ -1188,13 +1194,14 @@ As you might have guessed, the &comedi; library has functions
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to help you in your quest to accurately measure slowly varying
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inputs:
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<programlisting>
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int <link linkend="func-ref-comedi-sv-init">comedi_sv_init</link>(<link linkend="ref-type-comedi-sv-t">comedi_sv_t</link> * sv, <link linkend="ref-type-comedi-t">comedi_t</link> * device, unsigned int subdevice, unsigned int channel);
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int <link linkend="func-ref-comedi-sv-init">comedi_sv_init</link>(<link linkend="ref-type-comedi-sv-t">comedi_sv_t</link> *sv, <link linkend="ref-type-comedi-t">comedi_t</link> *device, unsigned int subdevice,
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unsigned int channel);
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</programlisting>
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This function initializes the
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<link linkend="ref-type-comedi-sv-t">comedi_sv_t</link> data structure, used
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to do the averaging acquisition:
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<programlisting>
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struct comedi_sv_struct{
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struct comedi_sv_struct {
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<link linkend="ref-type-comedi-t">comedi_t</link> *dev;
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unsigned int subdevice;
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unsigned int chan;
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@ -1211,7 +1218,7 @@ struct comedi_sv_struct{
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</programlisting>
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The actual acquisition is done with:
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<programlisting>
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int <link linkend="func-ref-comedi-sv-measure">comedi_sv_measure</link>(<link linkend="ref-type-comedi-sv-t">comedi_sv_t</link> * sv, double * data);
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int <link linkend="func-ref-comedi-sv-measure">comedi_sv_measure</link>(<link linkend="ref-type-comedi-sv-t">comedi_sv_t</link> *sv, double *data);
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</programlisting>
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The number of samples over which the
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<function>comedi_sv_measure()</function> averages is limited by the
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@ -2005,78 +2012,78 @@ An example to set up a device as a master is given below.
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</para>
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<programlisting><![CDATA[
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void comediEnableMaster(comedi_t* dev){
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comedi_insn configCmd;
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lsampl_t configData[2];
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int ret;
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unsigned int d = 0;
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static const unsigned rtsi_subdev = 10;
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static const unsigned rtsi_clock_line = 7;
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void comediEnableMaster(comedi_t *dev){
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comedi_insn configCmd;
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lsampl_t configData[2];
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int ret;
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unsigned int d = 0;
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static const unsigned rtsi_subdev = 10;
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static const unsigned rtsi_clock_line = 7;
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/* Route RTSI clock to line 7 (not needed on pre-m-series boards since their
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clock is always on line 7). */
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memset(&configCmd, 0, sizeof(configCmd));
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memset(&configData, 0, sizeof(configData));
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configCmd.insn = INSN_CONFIG;
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configCmd.subdev = rtsi_subdev;
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configCmd.chanspec = rtsi_clock_line;
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configCmd.n = 2;
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configCmd.data = configData;
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configCmd.data[0] = INSN_CONFIG_SET_ROUTING;
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configCmd.data[1] = NI_RTSI_OUTPUT_RTSI_OSC;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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// Set clock RTSI line as output
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ret = comedi_dio_config(dev, rtsi_subdev, rtsi_clock_line, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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/* Route RTSI clock to line 7 (not needed on pre-m-series boards since their
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clock is always on line 7). */
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memset(&configCmd, 0, sizeof(configCmd));
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memset(&configData, 0, sizeof(configData));
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configCmd.insn = INSN_CONFIG;
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configCmd.subdev = rtsi_subdev;
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configCmd.chanspec = rtsi_clock_line;
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configCmd.n = 2;
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configCmd.data = configData;
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configCmd.data[0] = INSN_CONFIG_SET_ROUTING;
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configCmd.data[1] = NI_RTSI_OUTPUT_RTSI_OSC;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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// Set clock RTSI line as output
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ret = comedi_dio_config(dev, rtsi_subdev, rtsi_clock_line, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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/* Set routing of the 3 main AI RTSI signals and their direction to output.
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We're reusing the already initialized configCmd instruction here since
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it's mostly the same. */
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configCmd.chanspec = 0;
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configCmd.data[1] = NI_RTSI_OUTPUT_ADR_START1;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 0, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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/* Set routing of the 3 main AI RTSI signals and their direction to output.
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We're reusing the already initialized configCmd instruction here since
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it's mostly the same. */
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configCmd.chanspec = 0;
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configCmd.data[1] = NI_RTSI_OUTPUT_ADR_START1;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 0, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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configCmd.chanspec = 1;
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configCmd.data[1] = NI_RTSI_OUTPUT_ADR_START2;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 1, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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configCmd.chanspec = 1;
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configCmd.data[1] = NI_RTSI_OUTPUT_ADR_START2;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 1, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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configCmd.chanspec = 2;
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configCmd.data[1] = NI_RTSI_OUTPUT_SCLKG;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 2, INSN_CONFIG_DIO_OUTPUT);
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if(ret < 0){
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comedi_perror("comedi_dio_config");
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exit(1);
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}
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configCmd.chanspec = 2;
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configCmd.data[1] = NI_RTSI_OUTPUT_SCLKG;
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ret = comedi_do_insn(dev, &configCmd);
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if(ret < 0){
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comedi_perror("comedi_do_insn: INSN_CONFIG");
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exit(1);
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}
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ret = comedi_dio_config(dev, rtsi_subdev, 2, INSN_CONFIG_DIO_OUTPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
]]></programlisting>
|
||||
|
||||
|
|
@ -2088,86 +2095,87 @@ external clock source instead of using its internal clock directly (for
|
|||
best syncronization).
|
||||
</para>
|
||||
<programlisting><![CDATA[
|
||||
void comediEnableSlave(comedi_t* dev){
|
||||
comedi_insn configCmd;
|
||||
lsampl_t configData[3];
|
||||
int ret;
|
||||
unsigned int d = 0;;
|
||||
static const unsigned rtsi_subdev = 10;
|
||||
static const unsigned rtsi_clock_line = 7;
|
||||
void comediEnableSlave(comedi_t *dev){
|
||||
comedi_insn configCmd;
|
||||
lsampl_t configData[3];
|
||||
int ret;
|
||||
unsigned int d = 0;;
|
||||
static const unsigned rtsi_subdev = 10;
|
||||
static const unsigned rtsi_clock_line = 7;
|
||||
|
||||
memset(&configCmd, 0, sizeof(configCmd));
|
||||
memset(&configData, 0, sizeof(configData));
|
||||
configCmd.insn = INSN_CONFIG;
|
||||
configCmd.subdev = rtsi_subdev;
|
||||
configCmd.chanspec = 0;
|
||||
configCmd.n = 3;
|
||||
configCmd.data = configData;
|
||||
configCmd.data[0] = INSN_CONFIG_SET_CLOCK_SRC;
|
||||
configCmd.data[1] = NI_MIO_PLL_RTSI_CLOCK(rtsi_clock_line);
|
||||
configCmd.data[2] = 100; /* need to give it correct external clock period */
|
||||
ret = comedi_do_insn(dev, &configCmd);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_do_insn: INSN_CONFIG");
|
||||
exit(1);
|
||||
}
|
||||
/* configure RTSI clock line as input */
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, rtsi_clock_line, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
/* Configure RTSI lines we are using for AI signals as inputs. */
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 0, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 1, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 2, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
memset(&configCmd, 0, sizeof(configCmd));
|
||||
memset(&configData, 0, sizeof(configData));
|
||||
configCmd.insn = INSN_CONFIG;
|
||||
configCmd.subdev = rtsi_subdev;
|
||||
configCmd.chanspec = 0;
|
||||
configCmd.n = 3;
|
||||
configCmd.data = configData;
|
||||
configCmd.data[0] = INSN_CONFIG_SET_CLOCK_SRC;
|
||||
configCmd.data[1] = NI_MIO_PLL_RTSI_CLOCK(rtsi_clock_line);
|
||||
configCmd.data[2] = 100; /* need to give it correct external clock period */
|
||||
ret = comedi_do_insn(dev, &configCmd);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_do_insn: INSN_CONFIG");
|
||||
exit(1);
|
||||
}
|
||||
/* configure RTSI clock line as input */
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, rtsi_clock_line, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
/* Configure RTSI lines we are using for AI signals as inputs. */
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 0, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 1, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
ret = comedi_dio_config(dev, rtsi_subdev, 2, INSN_CONFIG_DIO_INPUT);
|
||||
if(ret < 0){
|
||||
comedi_perror("comedi_dio_config");
|
||||
exit(1);
|
||||
}
|
||||
}
|
||||
|
||||
int comediSlaveStart(comedi_t* dev){
|
||||
comedi_cmd cmd;
|
||||
unsigned int nChannels = 8;
|
||||
double sampleRate = 50000;
|
||||
unsigned int chanList[8];
|
||||
int i;
|
||||
int comediSlaveStart(comedi_t *dev){
|
||||
comedi_cmd cmd;
|
||||
unsigned int nChannels = 8;
|
||||
double sampleRate = 50000;
|
||||
unsigned int chanList[8];
|
||||
int i;
|
||||
|
||||
// Setup chan list
|
||||
for(i = 0; i < nChannels; i++){
|
||||
chanList[i] = CR_PACK(i, 0, AREF_GROUND);
|
||||
}
|
||||
// Set up command
|
||||
memset(&cmd, 0, sizeof(cmd));
|
||||
ret = comedi_get_cmd_generic_timed(dev, subdevice, &cmd, int(1e9/(nChannels * sampleRate)));
|
||||
if(ret<0){
|
||||
printf("comedi_get_cmd_generic_timed failed\n");
|
||||
return ret;
|
||||
}
|
||||
cmd.chanlist = chanList;
|
||||
cmd.chanlist_len = nChannels;
|
||||
cmd.scan_end_arg = nChannels;
|
||||
cmd.start_src = TRIG_EXT;
|
||||
cmd.start_arg = CR_EDGE | NI_EXT_RTSI(0);
|
||||
cmd.convert_src = TRIG_EXT;
|
||||
cmd.convert_arg = CR_INVERT | CR_EDGE | NI_EXT_RTSI(2);
|
||||
cmd.stop_src = TRIG_NONE;
|
||||
// Setup chan list
|
||||
for(i = 0; i < nChannels; i++){
|
||||
chanList[i] = CR_PACK(i, 0, AREF_GROUND);
|
||||
}
|
||||
// Set up command
|
||||
memset(&cmd, 0, sizeof(cmd));
|
||||
ret = comedi_get_cmd_generic_timed(dev, subdevice, &cmd,
|
||||
(int)(1e9/(nChannels * sampleRate)));
|
||||
if(ret<0){
|
||||
printf("comedi_get_cmd_generic_timed failed\n");
|
||||
return ret;
|
||||
}
|
||||
cmd.chanlist = chanList;
|
||||
cmd.chanlist_len = nChannels;
|
||||
cmd.scan_end_arg = nChannels;
|
||||
cmd.start_src = TRIG_EXT;
|
||||
cmd.start_arg = CR_EDGE | NI_EXT_RTSI(0);
|
||||
cmd.convert_src = TRIG_EXT;
|
||||
cmd.convert_arg = CR_INVERT | CR_EDGE | NI_EXT_RTSI(2);
|
||||
cmd.stop_src = TRIG_NONE;
|
||||
|
||||
ret = comedi_command(dev0, &cmd0);
|
||||
if(ret<0){
|
||||
printf("comedi_command failed\n");
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
ret = comedi_command(dev0, &cmd0);
|
||||
if(ret<0){
|
||||
printf("comedi_command failed\n");
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
]]></programlisting>
|
||||
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue