spi

Update the list of available packages and slackbuilds

$ spi [[-u|--update]]

$ spi [[-i|--install]] [package/slackbuild_name]

$ spi [[-U|--upgrade]]

$ spi [search_terms]

$ spi --show [package/slackbuild_name]

$ spi --clean

spi {options}

-d
    Specify the SPI device number (e.g., /dev/spidev0.0).

-s
    Set the SPI clock speed in Hz.

-m
    Set the SPI mode (CPOL, CPHA, etc.).

-b
    Set the number of bits per word.

-D
    Enable debugging output.

-r
    Read from the SPI device.

-w
    Write to the SPI device (hexadecimal).

-l
    Specify the length of the data to read or write.

-v
    Enable verbose output.

The spi command is a utility, often found within embedded Linux distributions and systems with SPI interfaces, used to interact with devices connected via the Serial Peripheral Interface (SPI) bus.
It allows users to read from and write to SPI devices, configure SPI parameters like clock speed, mode, and chip select polarity.
This interaction often requires specific device driver support and configuration to be fully functional. While not a standard Linux command readily available on all systems, it typically comes bundled with SPI tools and libraries tailored for embedded development and testing. The tool often reads or writes data to SPI devices by interfacing directly with the SPI driver. Due to its hardware-specific nature, its usage and availability will vary significantly depending on the specific Linux distribution and hardware platform. Some versions may provide scripting capabilities to automate SPI transactions. Understanding the SPI protocol and the connected device's requirements is crucial for successful use.

The `spi` command is not a standard Linux utility and might require installing additional packages or be platform-specific. It also usually requires root privileges.

Write the byte `0x01` to device 0 of SPI bus 0:
`spi -d /dev/spidev0.0 -w 01`

Read 4 bytes from the same device:
`spi -d /dev/spidev0.0 -r -l 4`

spidev(4), i2c(1)