gpioow(4) - NetBSD Manual Pages

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GPIOOW(4)               NetBSD Kernel Interfaces Manual              GPIOOW(4)


NAME

     gpioow -- 1-Wire bus bit-banging through GPIO pin


SYNOPSIS

     gpioow* at gpio? offset 0 mask 0x1
     gpioow* at gpio?
     onewire* at gpioow?


DESCRIPTION

     The gpioow driver allows bit-banging a 1-Wire bus as a master using one
     GPIO pin.  The pin is used as a data signal.  The GPIO pin must be able
     to drive an output and read an input.

     The pin number is specified in the kernel configuration with the offset
     locator.  The mask locator should always be 0x1.  The offset and mask can
     also be specified when gpioow is attached at runtime using the GPIOATTACH
     ioctl(2) on the gpio(4) device.


SEE ALSO

     gpio(4), intro(4), onewire(4)


HISTORY

     The gpioow driver first appeared in OpenBSD 4.0 and NetBSD 4.0.


AUTHORS

     The gpioow driver was written by Alexander Yurchenko <grange@openbsd.org>
     and was ported to NetBSD by Jeff Rizzo <riz@NetBSD.org>.

NetBSD 6.1.2                     July 19, 2009                    NetBSD 6.1.2