.\" $NetBSD: scmdspi.4,v 1.1 2021/12/07 17:39:54 brad Exp $ .\" .\" Copyright (c) 2021 Brad Spencer <brad@anduin.eldar.org> .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd December 1, 2021 .Dt SCMDSPI 4 .Os .Sh NAME .Nm scmdspi .Nd SPI frontend to the Sparkfun Serial Controlled Motor Driver .Sh SYNOPSIS .Cd "scmd* at spi? slave 0" .Cd "scmd* at spi? slave 1" .Sh DESCRIPTION The .Nm driver provides the SPI frontend attachment for the Sparkfun SCMD device. .Sh SYSCTL VARIABLES The following .Xr sysctl 3 variables are inherited from .Xr scmd 4 : .Bl -tag -width indent .It Li hw.scmd0.debug If the driver is compiled with .Dv SCMD_DEBUG , this node will appear and can be used to set the debugging level. .El .Sh FILES .Bl -tag -width /dev/rcaXXXXX -compact .It Pa /dev/scmd Ns Ar u character device allowing access to the register space of a main .Ar u , SCMD device .Sh SEE ALSO .Xr iic 4 , .Xr spi 4 , .Xr scmdi2c 4 , .Xr scmdspi 4 , .Xr scmdctl 1 , .Xr sysctl 8 .Sh HISTORY The .Nm driver first appeared in .Nx 10.0 . .Sh AUTHORS .An -nosplit The .Nm driver was written by .An Brad Spencer Aq Mt brad@anduin.eldar.org . .Sh BUGS When used in SPI mode, the SCMD device uses an odd method of doing reads that can become stuck. See the command spi_read_one in the .Xr scmdctl 1 utility to try and unstick the device when this happens. |