Hi. I read all previous discussions but i have not found any clear instruction how to make PWM works. Here is my steps: sudo /opt/nvidia/jetson-io/jetson-io.py Configure 40-pin expansion header Check “pwm0 (32)” and “pwm2 (33)” enabled. Reboot echo 0 > /sys/class/pwm/pwmchip0/export echo 50000 > …

hello filipp, may I know are you working with a customize board? please refer to Topic 157462 , for the steps to enabled Pin-32 as PWM. thanks

hello filipp, please also examine your pin configuration, which has definition in the device tree. you may disassembler the dtb file into text file for checking, for example, $ dtc -I dtb -O dts -o output.txt tegra210-p3448-0000-p3449-0000-a02.dtb thanks

What is the location of tegra210-p3448-0000-p3449-0000-a02.dtb? I run your command and got: dtc -I dtb -O dts -o output.txt tegra210-p3448-0000-p3449-0000-a02.dtb FATAL ERROR: Couldn't open "tegra210-p3448-0000-p3449-0000-a02.dtb": No such file or directory I have not configured or build kernel, …

hello filipp, it depends-on the device tree you’re flashing to you Nano platforms, you may check flashing messages for confirmation. for example, [ 260.8830 ] Writing partition DTB with tegra210-p3448-0000-p3449-0000-a02.dtb.encrypt [ 260.9492 ] [................................................] …

I used official image from here, https://developer.nvidia.com/embedded/learn/get-started-jetson-nano-devkit#write . I copied it with dd command and there was no output like you provided.

hello filipp, according to pinmux spreadsheets , pin-32, GPIO07 and pin-33, GPIO13 were configure as GPIO by default. please help to narrow down the issue, please also have an alternative ways to have customization besides using Jetson-IO tools. you may also refer to Pinmux Changes session to cus…

Ok, I’ll try alternative way and let you know. I thought jetson-io.py allows to reconfigure pins without flashing.

hello filipp, please also check PWM status and share the results. i.e. $ sudo cat /sys/kernel/debug/pwm

platform/70110000.pwm, 1 PWM device pwm-0 (pwm-regulator ): requested enabled period: 2500 ns duty: 0 ns polarity: normal platform/7000a000.pwm, 4 PWM devices pwm-0 (sysfs ): requested enabled period: 50000 ns duty: 25000 ns polarity: normal pwm-1 (pwm-regulator )…

hello filipp, you can only access pwmchip0 (@7000a000); pwmchip4(@70110000) is not expected to be used by user. you may use pwm@pwmchip0 by exporting them. i.e. echo '<0/1/2/3>' > /sys/class/pwm/pwmchip0/export

Have you read my messages? In the first message i wrote the exact steps, i export pwmchip0 echo 0 > /sys/class/pwm/pwmchip0/export Command /sys/kernel/debug/pwm shows debug info about everything. I am not using 70110000. I am using pwmchip0, can you see the lines: platform/7000a000.pwm, 4 PWM de…

Jetson Nano PWM not working

Robotics & Edge Computing Jetson Systems Jetson Nano

filipp September 23, 2020, 11:38am 14

Modified:

platform/7000a000.pwm, 4 PWM devices
 pwm-0   (sysfs               ): requested enabled period: 10000 ns duty: 2000 ns polarity: normal

Still no signal - only random noise.

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Jetson Nano PWM not working

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