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https://git.rwth-aachen.de/acs/public/villas/node/
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103 lines
2.8 KiB
C++
103 lines
2.8 KiB
C++
/** Node type: comedi
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2020, Institute for Automation of Complex Power Systems, EONERC
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* @license GNU General Public License (version 3)
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*
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* VILLASnode
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************************/
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/**
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* @addtogroup comedi Comedi node type
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* @ingroup node
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* @{
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*/
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#pragma once
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#include <comedilib.h>
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#include <villas/list.h>
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#include <villas/timing.h>
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/* Forward declarations */
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struct vnode;
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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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/** @see node_type::print */
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char * comedi_print(struct vnode *n);
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/** @see node_type::parse */
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int comedi_parse(struct vnode *n, json_t *json);
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/** @see node_type::start */
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int comedi_start(struct vnode *n);
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/** @see node_type::stop */
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int comedi_stop(struct vnode *n);
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/** @see node_type::read */
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int comedi_read(struct vnode *n, struct sample * const smps[], unsigned cnt);
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/** @see node_type::write */
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int comedi_write(struct vnode *n, struct sample * const smps[], unsigned cnt);
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/** @} */
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