Hi :) I have a problem configuring and using SPI on the Jetson Nano development board. I hope that please anyone here can help me out solving this problem. Here’s what I’ve done:
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As always, I’ve downloaded the latest version of the JetPack 4.6.1 (with this link).
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As it’s written in many of the topics here, I’ve used
sudo /opt/nvidia/jetson-io/jetson-io.pytool, to enable SPI on these pins 19-MOSI, 21-MISO, 23-SCK and 24-CS. (I’ve also seen that in older versions of the JP this tool had some problems before JP 4.3) -
Once I’ve enabled it, I rebooted and used
sudo modprobe spidevto enable it correctly. I’ve tested it usingls /dev/ | grep spiand it listedspidev0.0,spidev0.1,spidev1.0andspidev1.1. -
I’ve also tested it using
sudo /opt/nvidia/jetson-io/config-by-function.py -l enabledand it showed this:
The following functions are enabled on the 40-pin header:
1. spi1
After these verifications I thought that I was able to use SPI correctly, and I was trying to do the loopback test using this compiled executable:
https://forums.developer.nvidia.com/t/jetson-nano-trouble-using-spi/195510/13
I’ve used a wire to bridge 19-21 pins (MISO to MOSI), but I wasn’t able to make it work using sudo ./spidev_test -D/dev/spidev0.0 -n1 -s10000000 -g10 -p1 -zz.
using device: /dev/spidev0.0
setting spi mode for read,write
setting spi bpw
setting max speed for rd/wr
spi mode: 0
bits per word: 8 bytes per word: 1
max speed: 10000000 Hz (10000 KHz)
no. runs: 1
Using seed:0x5f9f64e2
loop count = 0
Using even no. pattern …
transfer bytes [10]
0000: 02 04 06 08 0A 0C 0E 10 12 14
transfer: Return actual transfer length: 10
receive bytes [10]
0000: 00 00 00 00 00 00 00 00 00 00
mismatch index 0
^^^ 00 00 00 00 00 00 00 00 00 00 00 /dev/spidev0.0: TEST FAILED !!! (status:-1)
If any of you guys can help me it would be highly appreciated, I’ve tried the same process with 2 Jetsons, initially I thought that it was a problem from the pins (maybe a malfunctioning) but I’m not sure how I can proceed from now, or how I can make it work.