I am creating a kernel module for controlling the GPIOs for learning purpose. I have written the code such that if anyone sends “4,1” to /proc/lll-gpio, pin 37 should turn on. I am developing a kernel module to control GPIOs for educational purposes. My module is designed so that sending the strin…

hello 283982, please also share your L4T version, you may check release tag for confirmation, $ cat /etc/nv_tegra_release may I also confirm which GPIO pin you would like to controlled? you may also dig into pinmux cfg for the pin address. here’s Xavier’s pinmux cfg as an example, $OUT/Linux_for_…

[image] JerryChang: $ cat /etc/nv_tegra_release L4T version R32 (release), REVISION: 7.5, GCID: 36557527, BOARD: t210ref, EABI: aarch64 I am trying to control pin 37 on Jetson Nano. My goal is to actually control any GPIO based on the value that I write to the proc file. For eg: If I write…

hello 283982, pin-37 it’s PB.04 according to 40-Pin Header (J6) , right? you may see-also Accessing GPIOs via “gpio” Device Labels for controlling the pin directly.

Yes it is PB.04. According to the Tegra X1 Technical reference manual, I should be able to access the GPIO_CNF register using 0x6000d000 + 0x04 address and the GPIO_OE register by using 0x6000d000 + 0x014. So when I set the pin HIGH using Jetson.GPIO in a python, my kernel module should be able the…

After looking through the internet, I found out that I should have first called request_mem_region(). So I updated the code, ran it and found out request_mem_region fails which indicates that something else is already accessing those physical address. As you suggest I refer the Topic 220249 . I ran …

Cannot access GPIO registers on Jetson Nano

Robotics & Edge Computing Jetson Systems Jetson Nano

JerryChang August 23, 2024, 7:43am 7

that’s correct.
BTW, I don’t have Nano pinmux cfg for checking at the moment, please see-also Topic 220249 for reference.

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Cannot access GPIO registers on Jetson Nano

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