To run the Hipi Control GUI
SPI devices can be accessed using a kernel device driver instead of accessing the appropriate pins directly through /dev/mem. This has the advantage that you can set up the device driver options so that access does not require root permissions.
This panel allows you to setup and manage the SPI Device Driver settings
Check or uncheck the SPI Kernel Modules Loaded checkbox to load and unload the kernel drivers. To permanently skip or load the device drivers at system startup see Loading Device Drivers.
Access to the SPI devices can be granted to members of the group spi. The panel provides a simple interface that allows you toggle this option on and off using the 'Allow Group Access' checkbox and also manage group membership.
You can also set the buffer size used by the SPI driver if you have some special usage that requires a larger buffer than the default.
Changes to the 'Allow Group Access' and 'bufsiz' settings will persist across system reboots.
See Also :
SPI Device Driver Loading Device Drivers