Hi. Since last month, I frequently ask about kernel & SPI. Thanks to “linuxdev”, build kernel process is partially solved. (But I still need to ask more (;_;)) Before study more about build kernel, I want to ask you people about breif step for using SPI on AGX DevKit. For example. GPIO MUX setting(use GPIO MUX configuration .xls file from NVIDIA) Configure Device tree Build source Flash it to AGX. . . . Like this. In my situation, I can’t draw any blueprint about using SPI (I’m expert to using Microcontroller such as TI C2000 MCU, AVR… etc ) (But I’m super newbie to Linux systems like RPi, Jetson…) Can you help me to understand the way to develope SPI on AGX Xavier? Thanks.

Have a reference to below link. [image] Spidev read failed on xavier devkit Jetson AGX Xavier I want to use spi to read some device, so I enable spidev0.0, spidev1.0, spidev2.0. But there is no any signal on spi port when I test these port. my device tree: spi@3210000 { compatible = "nvidia,tegra186-spi"; reg = ; interrupts = ; #address-cells = ; #size-cells = ; iommus = ; dma-coherent; dmas = ; dma-names = "rx", "tx"; spi-max-frequency = ; nvidia,clk-parents = "pll_p", "cl… [image] SPI1 not work on Xavier Jetson AGX Xavier I enable the spi1 and add spidev device node in dts. I can find the /dev/spidev0.0, but I can’t detect the signal with Logical Analysis. So, I want to know that the SPI1 is spidev0.0, right ? [image] SPI works with JetPack 3.3 but not JetPack 4.2 Jetson TX2 Hello, I have modified the device tree using JetPack 3.3 and managed to get SPI working, including talking to an actual SPI slave device from the TX2. However, I wish to use the latest JetPack 4.2 (to be up-to-date and because other features work in 4.2 that I do not have working in 3.3), but when I make the same changes to the device tree for supporting SPI with JetPack 4.2, the SPI no longer works. I see my changes to the device tree, the /dev/spidevM.N devices show up, and I can open/read/wr…

Can you tell me I’m wrong or right? Set pinmux using pinmux.xlxs from NVIDIA. Modify device tree Build kernel with modified PINMUX & Device tree. Flash kernel things to AGX. And some software level check & develope SPI code. is it right?

Yes, that should be correct. Also you need to flash whole system to update the cfg file. -k wouldn’t apply the cfg file.

How to use SPI? Can you tell me brief steps?

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier

ShaneCCC May 25, 2020, 5:00am 3

Have a reference to below link.

Topic		Replies	Views
Is there anyone who can tell or teach me how to use SPI on AGX Xavier? Jetson AGX Xavier spi	6	1942	May 11, 2020
Xavier SPI guide issue Jetson AGX Xavier	3	1382	May 31, 2019
Steps to enable SPI interface on AGX Xavier Jetson AGX Xavier spi	12	3349	December 2, 2020
Is there any spidev. in Jetson AGX with native JetPack 4.6? Jetson AGX Xavier spi	4	962	September 30, 2021
Question: How do I enable and address SPI ports? Jetson AGX Xavier	26	5733	June 20, 2019
SPI quastion again. About configure kernel. please help me Jetson AGX Xavier spi	13	1837	June 11, 2020
What is differnce between Jetson-IO and manual PINMUX & device-tree configuration Jetson AGX Xavier spi	8	1019	June 12, 2020
About testing SPI, Please can you check am I right? Jetson AGX Xavier spi	9	1834	June 19, 2020
Jetson Expansion Header Tool Configuration Cannot Be Saved Jetson AGX Xavier spi	3	1317	November 25, 2020
Flashing Xavier with modified Device Tree Jetson AGX Xavier	10	3437	August 21, 2019

How to use SPI? Can you tell me brief steps?

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