mirror of
https://git.rwth-aachen.de/acs/public/villas/node/
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80 lines
2.2 KiB
C++
80 lines
2.2 KiB
C++
/* Node type: comedi.
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*
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* Author: Steffen Vogel <post@steffenvogel.de>
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* SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University
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* SPDX-License-Identifier: Apache-2.0
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*/
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#pragma once
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#include <comedilib.h>
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#include <villas/list.hpp>
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#include <villas/timing.hpp>
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namespace villas {
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namespace node {
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// Forward declarations
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class NodeCompat;
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// whether to use read() or mmap() kernel interface
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#define COMEDI_USE_READ (1)
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//#define COMEDI_USE_READ (0)
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struct comedi_chanspec {
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unsigned int maxdata;
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comedi_range *range;
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};
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struct comedi_direction {
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int subdevice; ///< Comedi subdevice
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int buffer_size; ///< Comedi's kernel buffer size in kB
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int sample_size; ///< Size of a single measurement sample
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int sample_rate_hz; ///< Sample rate in Hz
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bool present; ///< Config present
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bool enabled; ///< Card is started successfully
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bool running; ///< Card is actively transfering samples
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struct timespec started; ///< Timestamp when sampling started
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struct timespec last_debug; ///< Timestamp of last debug output
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size_t counter; ///< Number of villas samples transfered
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struct comedi_chanspec *chanspecs; ///< Range and maxdata config of channels
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unsigned *chanlist; ///< Channel list in comedi's packed format
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size_t chanlist_len; ///< Number of channels for this direction
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char *buffer;
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char *bufptr;
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};
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struct comedi {
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char *device;
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struct comedi_direction in, out;
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comedi_t *dev;
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#if COMEDI_USE_READ
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char *buf;
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char *bufptr;
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#else
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char *map;
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size_t bufpos;
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size_t front;
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size_t back;
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#endif
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};
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char *comedi_print(NodeCompat *n);
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int comedi_parse(NodeCompat *n, json_t *json);
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int comedi_start(NodeCompat *n);
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int comedi_stop(NodeCompat *n);
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int comedi_poll_fds(NodeCompat *n, int fds[]);
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int comedi_read(NodeCompat *n, struct Sample *const smps[], unsigned cnt);
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int comedi_write(NodeCompat *n, struct Sample *const smps[], unsigned cnt);
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} // namespace node
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} // namespace villas
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