Xenomai real-time driver to control shift registers on Elk Pi boards using GPIOs and SPI.

Based on Nicolas Schurando's spi-bcm283x-rtdm driver: https://github.com/nicolas-schurando/spi-bcm283x-rtdm.git.

Credits to Mike McCauley's user space library to access bcm2835 peripherals: http://www.airspayce.com/mikem/bcm2835/.

Navigate to boards/\<board-name>

and then build with:

$ export KERNEL_PATH=<path to kernel source>
$ export CROSS_COMPILE=<arm compiler prefix>
$ make

To load the driver : insmod shiftreg_rtdm.ko adc_chans_per_tick=4

where adc_chans_per_tick specifies how many adc channels are sampled per iteration.

Copyright 2019 Modern Ancient Instruments Networked AB, dba Elk, Stockholm