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https://git.rwth-aachen.de/acs/public/villas/node/
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fe302f9649
The write / DAC direction has been tested with two output signals, see etc/comedi.conf for reference. For now, the buffer size may not be (considerably) smaller than 32kB, Comedi stops working for unknown reasons. To compensate for the latency (always approx. one buffer size) if only small sample rates are required, configure the path for upsampling (sample-and-hold via rate parameter) at the same rate as the out direction of the comedi node.
102 lines
2.7 KiB
C
102 lines
2.7 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 2018, 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/node.h>
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#include <villas/list.h>
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#include <villas/timing.h>
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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
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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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int 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 node *n);
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/** @see node_type::parse */
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int comedi_parse(struct node *n, json_t *cfg);
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/** @see node_type::open */
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int comedi_start(struct node *n);
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/** @see node_type::close */
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int comedi_stop(struct node *n);
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/** @see node_type::read */
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int comedi_read(struct node *n, struct sample *smps[], unsigned cnt);
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/** @see node_type::write */
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int comedi_write(struct node *n, struct sample *smps[], unsigned cnt);
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/** @} */
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