SPI loopback RX not receiving

[eduri.lavanya]

Hi

How to do SPI loopback on jetson agx orin ?
For this one I went through
After the setup, we’re
$ sudo /opt/nvidia/jetson-io/jetson-io.py
In our case we select SPI1 (pins 19,21,23,24,26)
MOSI MISO pins shorted
1-> sudo modprob spidev

2-> https://raw.githubusercontent.com/torvalds/linux/v4.9/tools/spi/spidev_test.c
3-> sudo ./spidev_test -v -D /dev/spidev0.0
i got like below fig

1.Anything missed on my end?
2. What’s the next step to solve this one?

FYI
Using Jetson AGX Orin dev kit
And jetpack version 5.1.2
Jetson Linux_R35.4.1

Thank you in advance

[KevinFFF]

Hi eduri.lavanya,

@eduri.lavanya

$ sudo /opt/nvidia/jetson-io/jetson-io.py

Do you reboot the board to apply the change?

@eduri.lavanya

MOSI MISO pins shorted

Have you shorted PIN19(SPI1_MOSI) and PIN21(SPI1_MISO)?

@eduri.lavanya

sudo ./spidev_test -v -D /dev/spidev0.0

Could you try to run the following command instead?

$ sudo ./spidev_test -D /dev/spidev0.0 -v -p "HelloWorld123456789abcdef"