Hey, We are using the PWM chip as single pulse generator. At the moment it works but with significant latency as it works via the sysfs interface. Is it possible to control the PWM chip via Direct Memory Access (DMA)? or is there any register that is accessible from user space to control the PWM…

Hi alon2, Are you using the devkit or custom board for Orin NX? What’s your Jetpack version in use? How’s the latency you see? and what’s your requirement? Have you tried using jetson-gpio/samples/simple_pwm.py at master · NVIDIA/jetson-gpio (github.com) to verify?

I am part of a team working with the NVIDIA Jetson Orin NX 16GB, equipped with JetPack 5.1.2. on a custom board. Our project demands the generation of precise, single PWM pulses with strict microsecond-level latency, aiming for a frequency of around 100 Hz. The unique challenge we face is the need …

Hi there @alon2 Kind of starting by the end. The result that you are getting after doing a busybox read (or write) is related to the action of the cbb “firewall” fabric, basically there is a controller filtering read/write operations over the CPU Complex registers. At least 2 ways around it: Mo…

[image] alon2: Our project demands the generation of precise, single PWM pulses with strict microsecond-level latency, aiming for a frequency of around 100 Hz. For Orin, PWM pulse width minimum is 1/256, where 256 is fixed number at its down counter. Thus, 1/256 = 0.0039 (~0.4%) is the lowes…

Hey Rubberazer & Kevin First Thank you for the comprehensive response! The JETGPIO library seems quite promising. I have a quick query regarding the PWM chip control. It appears you’re implementing additional PINOUT configurations as shown below: [image] Could you provide some clarification on …

@alon2 What you can do is compile one of the examples and check if something is coming out, for instance if you compile & run: JETGPIO/EXAMPLES_C/jetgpio_PWM_example.c at main · Rubberazer/JETGPIO · GitHub You should get a 10kHz signal at 50% duty cycle at pin 32 in the Orin NX. You can change it …

Generate low latency single pulse via PWM chip

Robotics & Edge Computing Jetson Systems Jetson Orin NX

KevinFFF March 13, 2024, 8:00am 9

That memory address is inaccessible.
If you read it, it will show some error messages in kernel dmesg.

Please just use sysfs or the sample in jetson-gpio for PWM.

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Generate low latency single pulse via PWM chip

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