How to set gpio for spi?

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Orin
27

Hi,
Is it possible the device is physically connected to B56 pin instead of E55 pin? And please check if CS0 has signal in the loopback test:

  1. Connect MOSI of SPI1 to MISO
  2. Execute $ sudo modprobe spidev
  3. Download/build this test file:
    https://raw.githubusercontent.com/torvalds/linux/v4.9/tools/spi/spidev_test.c
  4. Run the command and check if the result is expected:
$ sudo ./spidev_test -D /dev/spidev0.0 -v
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D  | ......@.......................
RX | FF FF FF FF FF FF 40 00 00 00 00 95 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF F0 0D  | ......@.......................

or

$ sudo ./spidev_test -D /dev/spidev0.0 -v -p "HelloWorld123456789abcdef"
spi mode: 0x0
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 48 65 6C 6C 6F 57 6F 72 6C 64 31 32 33 34 35 36 37 38 39 61 62 63 64 65 66 __ __ __ __ __ __ __  | HelloWorld123456789abcdef
RX | 48 65 6C 6C 6F 57 6F 72 6C 64 31 32 33 34 35 36 37 38 39 61 62 63 64 65 66 __ __ __ __ __ __ __  | HelloWorld123456789abcdef
  1. Check signal of CS0 port while doing step 4.