It’s a good thing I don’t do this sort of thing for a living. Oh wait…I do!. :)
Yeah. I forgot to mention that I had to remove the CUDA stuff in order to get the image under the 2gb github limit. I was going to zip those up in a separate tarball and post them but I forgot that as well. I’ll do it now and push them up to the github release in case someone needs them.
lol… luckily, the QA was on it… since I volunteered.
Has anyone had luck with either gtjoseph github repo:
https://github.com/gtjoseph/jetson-nano-support
or rt-net:
https://github.com/rt-net/JetsonNano_DT_SPI
I tried gtjosheph scripts, but it never enabled /dev/spidev* interfaces. I then tried rt-net, run.sh script and it did enable /dev/spidev0.0.
But when I transmit data through it I don’t see the SCLK, CS, MOSI toggle. I tried to use spidev_test:
nlbutts@jetson:~/projects$ sudo ./spidev_test -D /dev/spidev0.0 -v -p "test" -C
spi mode: 0x4
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | test
RX | 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | ....
But this is the result on the pins:
https://photos.app.goo.gl/RbJZrtEwc9nxprV16
When I run gpioinfo I get the following:
sudo gpioinfo | grep spi
gpiochip0 - 256 lines:
line 0: unnamed unused input active-high
line 1: unnamed unused input active-high
line 2: unnamed "pcie_wake" input active-high [used]
line 3: unnamed unused input active-high
line 4: unnamed unused input active-high
line 5: unnamed unused input active-high
line 6: unnamed "vdd-usb-hub-en" output active-high [used]
line 7: unnamed unused input active-high
line 8: unnamed unused input active-high
line 9: unnamed unused input active-high
line 10: unnamed unused input active-high
line 11: unnamed unused input active-high
line 12: unnamed unused input active-high
line 13: unnamed unused input active-high
line 14: unnamed unused input active-high
line 15: unnamed unused input active-high
line 16: unnamed unused input active-high
line 17: unnamed unused input active-high
line 18: unnamed unused input active-high
line 19: unnamed unused input active-high
line 20: unnamed unused input active-high
line 21: unnamed unused input active-high
line 22: unnamed unused input active-high
line 23: unnamed unused input active-high
line 24: unnamed unused input active-high
line 25: unnamed unused input active-high
line 26: unnamed unused input active-high
line 27: unnamed unused input active-high
line 28: unnamed unused input active-high
line 29: unnamed unused input active-high
line 30: unnamed unused input active-high
line 31: unnamed unused input active-high
line 32: unnamed unused input active-high
line 33: unnamed unused input active-high
line 34: unnamed unused input active-high
line 35: unnamed unused input active-high
line 36: unnamed unused input active-high
line 37: unnamed unused input active-high
line 38: unnamed unused input active-high
line 39: unnamed unused input active-high
line 40: unnamed unused input active-high
line 41: unnamed unused input active-high
line 42: unnamed unused input active-high
line 43: unnamed unused input active-high
line 44: unnamed unused input active-high
line 45: unnamed unused input active-high
line 46: unnamed unused input active-high
line 47: unnamed unused input active-high
line 48: unnamed unused input active-high
line 49: unnamed unused input active-high
line 50: unnamed unused input active-high
line 51: unnamed unused input active-high
line 52: unnamed unused input active-high
line 53: unnamed unused input active-high
Any ideas?
root@jetson:~# gpioinfo | grep -i spi
line 12: “SPI1_MOSI” unused input active-high
line 13: “SPI1_MISO” unused input active-high
line 14: “SPI1_SCK” unused input active-high
line 15: “SPI1_CS0” unused input active-high
line 16: “SPI0_MOSI” unused input active-high
line 17: “SPI0_MISO” unused input active-high
line 18: “SPI0_SCK” unused input active-high
line 19: “SPI0_CS0” unused input active-high
line 20: “SPI0_CS1” unused input active-high
line 232: “SPI1_CS1” unused input active-high
I just ran a quick test on a fresh system using the tool from gtjoseph https://github.com/gtjoseph/jetson-nano-support/releases/download/sdcard/flash-dtb-update-2019-11-24.tar.gz available as release here https://github.com/gtjoseph/jetson-nano-support/releases and it all works fine:
jetson@nanobox:~$ ls -la /dev/spi*
crw------- 1 root root 153, 0 Dez 6 15:05 /dev/spidev0.0
crw------- 1 root root 153, 1 Dez 6 15:05 /dev/spidev0.1
sudo gpioinfo | grep -i spi
line 16: “SPI0_MOSI” unused input active-high
line 17: “SPI0_MISO” unused input active-high
line 18: “SPI0_SCK” unused input active-high
line 19: “SPI0_CS0” “cs_gpio” output active-high [used]
line 20: “SPI0_CS1” “cs_gpio” output active-high [used]
line 232: “SPI1_CS1” unused output active-high
sudo ./spidev_test -D /dev/spidev0.0 -v -p “test” -C
spi mode: 0x4
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |test|
RX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ |test|
@gtj, there may be an issue with the device tree used in your setup: I was trying again to make an SPI LCD work and I noticed that with your DTB I get issues accessing GPIOs.
see above for some of the differences in the two DBT variants. the one from rt-net doesn’t throw any errors when trying to use GPIOs to control the LCD.
OK, I’ll take a look. This was with the tarball and “flashme.sh” correct?
that’s right.
I dd’d the 5 partitions from my other nano where I have only the spi0.0 enabled with the rt-net approach.
I managed to get a piscreen (raspberry pi SPI LCD) working https://devtalk.nvidia.com/default/topic/1066616/jetson-nano/-solved-lcd-tft-piscreen-not-working-on-r32-2-1/post/5409545/#5409545
@mirel.t.lazar Try the attached package and see if it works for you.
It only enables spidev0.0 and it uses hardware chip-select instead of gpio chip select.
flash-dtb-update-2019-12-07.tar.gz (504 KB)
I’ve updated my github repo with all you need to update a live Nano or an offline SDCard with the partitions necessary to enable SPI1 and /dev/spidev0.0. No need to install the Linux for Tegra package unless you want to modify the DTBs.
https://github.com/gtjoseph/jetson-nano-support/blob/master/README.md
https://github.com/gtjoseph/jetson-nano-support/releases/latest
I can confirm that the live update works. Although the SPI on the Jetson Nano behaves strangely. I will type up a new thread tonight on my findings. TLDR: SPI CS takes a long time to assert and deassert, which slows down the ability to read/write data at a high speed.
One of the things I did in this release was to have spi1 use hardware based chip select instead of GPIO based. I did this so there’d be less interference with other GPIO stuff. It’s odd that being hardware based is slower but I’ve seen that in the past. I can easily change just that CS pin back to CPIO and create a new package. Give me a few hours.
New release created that changes the chip select control method back to GPIO.
Hi gtj,
I just flash the tegra210-p3448-0000-p3449-0000-a02-spidev-0.dtb in jetson-nano-support to Nano dev kit which runs on l4t-r32.2.3-4.9. But it shows “SPI0_CS1” is not used. Any idea would be appreciated.
FYI,
sercomm@tegra-ubuntu:~/spi$ sudo gpioinfo | grep -i spi
line 12: "SPI1_MOSI" unused input active-high
line 13: "SPI1_MISO" unused input active-high
line 14: "SPI1_SCK" unused input active-high
line 15: "SPI1_CS0" unused input active-high
line 16: "SPI0_MOSI" unused input active-high
line 17: "SPI0_MISO" unused input active-high
line 18: "SPI0_SCK" unused input active-high
line 19: "SPI0_CS0" "cs_gpio" output active-high [used]
line 20: "SPI0_CS1" unused input active-high
line 232: "SPI1_CS1" unused input active-high
sercomm@tegra-ubuntu:~/spi$ cat /proc/devices | grep -i spi
153 spi
sercomm@tegra-ubuntu:~/spi$ ls /dev | grep -i spi
spidev0.0
sercomm@tegra-ubuntu:~/spi$ sudo ./spidev_test -D /dev/spidev0.0 -v -p "test" -C
spi mode: 0x4
bits per word: 8
max speed: 500000 Hz (500 KHz)
TX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | test
RX | 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | ....
Sigh. I knew someone would want the second chip select. :)
I left it out to free up that GPIO pin for other reasons. If you really need the second chip select I can make a package for you. Let me know.
I really wish nvidia would make this process easier. :(
Hi gtj,
Thanks for your reply.
sercomm:~/spi$ bash spi.sh
[sudo] password for sercomm:
spi mode: 0x4
bits per word: 8
max speed: 500000 Hz (500 KHz)
mode & SPI_TX_QUAD=0
mode & SPI_TX_DUAL=0
mode & SPI_RX_QUAD=0
mode & SPI_RX_DUAL=0
mode & SPI_LOOP=0
Function:[transfer]--LineNum:[172]
verbose=1
TX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | test
output_file=0
Function:[transfer]--LineNum:[193]
RX | 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | ....
input_tx
sercomm:~/spi$ bash spi.sh
spi mode: 0x4
bits per word: 8
max speed: 5000000 Hz (5000 KHz)
mode & SPI_TX_QUAD=0
mode & SPI_TX_DUAL=0
mode & SPI_RX_QUAD=0
mode & SPI_RX_DUAL=0
mode & SPI_LOOP=0
Function:[transfer]--LineNum:[172]
verbose=1
TX | 74 65 73 74 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | test
output_file=0
Function:[transfer]--LineNum:[193]
RX | 00 00 00 00 __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ __ | ....
input_tx
sercomm:~/spi$ gpio
gpiodetect gpiofind gpioget gpioinfo gpiomon gpioset
sercomm:~/spi$ sudo gpioinfo | grep -i spi
line 12: "SPI1_MOSI" unused input active-high
line 13: "SPI1_MISO" unused input active-high
line 14: "SPI1_SCK" unused input active-high
line 15: "SPI1_CS0" unused input active-high
line 16: "SPI0_MOSI" unused input active-high
line 17: "SPI0_MISO" unused input active-high
line 18: "SPI0_SCK" unused input active-high
line 19: "SPI0_CS0" "cs_gpio" output active-high [used]
line 20: "SPI0_CS1" unused input active-high
line 232: "SPI1_CS1" unused input active-high
Our hardware only use SPI0_CS0. After shortcut 19pin(SPI0_MOSI) and 21pin(SPI0_MISO). The spidev_test script above shows zeros but not “test”.
Could you help me to figure out what the problem it is?
Thanks again.
Hi mirel.t.lazar,
How could you receive data “test”?
Thanks.
maybe there is… the other night I was fiddling with pwm and since I already know things are never easy with Nvidia (let’s not mention Linus ;-)= ) I ended up using this:
apt install busybox
busybox devmem 0x700031fc 32 0x45
busybox devmem 0x6000d504 32 0x2
busybox devmem 0x70003248 32 0x46
busybox devmem 0x6000d100 32 0x00
cd /sys/devices/7000a000.pwm/pwm/pwmchip0
|–echo 0 > export # Control PWM0 on Pin 32
|–echo 2 > export # Control PWM2 on Pin 33
is there a way to do the same for enabling SPI on-the-fly?
more info here https://devtalk.nvidia.com/default/topic/1057330/jetson-nano/what-pins-can-be-used-for-pwm-control-except-33-in-samples/post/5386543/#5386543
@garretzou
what do you have on: sudo cat /sys/kernel/debug/tegra_gpio ?
I used the flash package as explained in https://devtalk.nvidia.com/default/topic/1062646/jetson-nano/updated-instructions-for-spi-on-nano-developmentkit-with-l4t-32-2-1/post/5409375/#5409375
on mine now
root@jetson:~# gpioinfo | grep -i spi
line 12: “SPI1_MOSI” unused input active-high
line 13: “SPI1_MISO” unused input active-high
line 14: “SPI1_SCK” unused input active-high
line 15: “SPI1_CS0” unused input active-high
line 16: “SPI0_MOSI” unused input active-high
line 17: “SPI0_MISO” unused input active-high
line 18: “SPI0_SCK” unused input active-high
line 19: “SPI0_CS0” unused input active-high
line 20: “SPI0_CS1” unused input active-high
line 232: “SPI1_CS1” unused input active-high
root@jetson:~# cat /sys/kernel/debug/tegra_gpio
Name:Bank:Port CNF OE OUT IN INT_STA INT_ENB INT_LVL
A: 0:0 64 40 40 24 00 00 000000
B: 0:1 f0 00 00 20 00 00 000000
C: 0:2 00 00 00 00 00 00 000000
root@jetson:~# ls /dev/spi*
/dev/spidev0.0