UCM-iMX95 Yocto Linux: SPI

SPI

SPI interface is available on header P15. The following example shows the usage of the Linux spidev interface as a loopback:

spidev

• Device Tree:

&lpspi7 {
...
	status = "okay";
...
};

• System board setup:
  short P15.3 (MOSI) and P15.2 (MISO) pins.

• Linux command line test:

./spidev_test -v -D /dev/spidev0.0 -p "hello"

You should see RX same as TX.

spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 kHz)
TX | 68 65 6C 6C 6F __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __  |hello|
RX | 68 65 6C 6C 6F __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __  |hello|