The GPIO bit-bang driver creates an interface to Linux GPIOs using the IOCTL API.

Basic 1-bit input and output is available along with accelerated multiple bit shift I/O.

GPIO bit-bang is well suited to PICMicro ICSP but not exclusively.

First install development tools and the kernel headers when using a regular kernel.

apt-get install raspberrypi-kernel-headers

If you updated the kernel with rpi-update, install rpi-source

Now install headers for kernel installed with rpi-update.

rpi-source --skip-space

Now install the kernel module.

hg clone http://hg.kewl.org/pub/gpio-bb
cd gpio-bb
make
make install

Update the modprobe configuration to create the gpio-bb device node when the module is loaded. For example, add the following to /etc/modprobe.d/modprobe.conf

install gpio-bb modprobe --ignore-install gpio-bb && modprobe gpio-bb && mknod /dev/gpio-bb c 180 0 && chmod 666 /dev/gpio-bb

Lastly, add the following to /etc/modules and reboot.

gpio-bb

GPIO bit-bang driver for OpenWRT

GPIO bit-bang driver for Raspbian

gpio-bb uses the kernel API to access pins, this API demands exclusive access to a pin per process. This means you cannot use gpio-bb and sysfs export simultaneously for a single pin.

Using gpio-bb