spi-config(1)

Usage

spi-config options ...

Overview

Set or query the configuration of a SPI port.

-d, --device=DEVICE: use the given Linux spidev character device.

-q, --query: print the current configuration.

-m, --mode=[0-3]: set the spi mode (see SPI MODES below).

-l, --lsb={0,1}: set LSB first (1) or MSB first (0).

-b, --bits=[7...]: set the number of bits per word.

-s, --speed=FREQUENCY: set clock frequency (in Hz).

-r, --spirdy={0,1}: set the SPI READY mode flag.

-s, --wait: block, keeping the file descriptor open. See WAIT OPTION below.

-h, --help: display the help screen and exit.

-v, --version: display the version number and exit.

Spi modes

`mode 0`	low iddle level, sample on leading edge.
`mode 1`	low iddle level, sample on trailing edge.
`mode 2`	high iddle level, sample on leading edge.
`mode 3`	high iddle level, sample on trailing edge.

Wait option

On some platforms, the speed is reset to a default value when the file descriptor is closed. To avoid this, one can use the -w option that keeps the file descriptor open. See also last example below.

Examples

`Get help:`	$ spi-config -h
`Query current configuration:`	$ spi-config --device=/dev/spidev0.0 -q
`Change clock frequency to 1 MHz:`	$ spi-config --device=/dev/spidev0.0 --speed=1000000
`Set a configuration and keep the device open:`	$ spi-config --wait --speed=1000000 & PID=$!
`Close device previously open:`	$ `kill` $PID

Releases

4 releases since Debian 10 (Buster); the text changed 1 time.

10
11–13

--spirdy since Debian 11 (Bullseye); --wait since Debian 11 (Bullseye); -r since Debian 11 (Bullseye).