COMEDI_DATA_WRITE(3)

✨ COMEDI_DATA_WRITE(3) ✨ — it's the comedi_data_write page from the Comedi reference, bestie 💖

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🌸 NAME 🌸

comedi_data_write — write a single sample to a channel, that's it, that's the whole vibe 🎀

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🦋 SYNOPSIS 🦋

#include <comedilib.h>

int comedi_data_write(comedi_t * device, unsigned int subdevice,
                      unsigned int channel, unsigned int range,
                      unsigned int aref, lsampl_t data);

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💅 DESCRIPTION 💅

Okay so, this function drops one single sample onto a channel. Which channel, you ask? It's specified by three little coordinates: the Comedi device device, the subdevice, and the channel. Main character trio, honestly 💖

If it's appropriate, the device gets configured to use the range specification range and the analog reference type aref. Emphasis on if appropriate.

⚠️ Heads up: analog reference types that the device doesn't support are silently ignored. No error, no drama, no text back. Just quietly unbothered. 💀

And then comedi_data_write writes the data value you passed in the parameter data to the channel you specified. That's the moment. That's the whole plot. 🌟

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👑 RETURN VALUE 👑

• On success, comedi_data_write returns 1 — which is literally the number of samples written. One sample, one boi, slay ✨
• If there's an error, -1 is returned. And ngl, you'd better check for it. 😭

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🫶 AUTHORS 🫶

These absolute legends wrote it, no cap:

• David Schleef <ds@schleef.org> — Author.
• Frank Mori Hess <fmhess@users.sourceforge.net> — Author.
• Herman Bruyninckx <Herman.Bruyninckx@mech.kuleuven.ac.be> — Author.
• Bernd Porr <tech@linux-usb-daq.co.uk> — Author.
• Ian Abbott <abbotti@mev.co.uk> — Author.
• Éric Piel <piel@delmic.com> — Author.

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💜 COPYRIGHT 💜

Copyright © 1998-2003 David Schleef Copyright © 2001-2003, 2005, 2008 Frank Mori Hess Copyright © 2002-2003 Herman Bruyninckx Copyright © 2012 Bernd Porr Copyright © 2012 Ian Abbott Copyright © 2012, 2015 Éric Piel

This document is part of Comedilib. In the context of this document, the term "source code" as defined by the license is interpreted as the XML source.

This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, version 2.1 of the License.

This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

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and that's the page, bestie 🧚✨ This was the Comedi reference version of COMEDI_DATA_WRITE(3), from the Comedi crew, dated 03/20/2026 🌸 — go write some samples, you've got this 💖🦋

Comedi · 03/20/2026 · COMEDI_DATA_WRITE(3) — periodt 💅