Hello all，
We used /opt/nvidia/jetson-io/ Jetson-io.py to set up the PWM function of pin32,
#!/usr/bin/env python
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import Jetson.GPIO as GPIO
import sys
import time
def main():
# Pin Setup:
# Board pin-numbering scheme
GPIO.setmode(GPIO.BOARD)
# set pin as an output pin with optional initial state of HIGH
GPIO.setup(32, GPIO.OUT, initial=GPIO.HIGH)
p = GPIO.PWM(32, 1000)
val = 25
incr = 5
p.start(val)
print("PWM running. Press CTRL+C to exit.")
try:
while True:
time.sleep(0.08)
if val >= 100:
incr = -incr
if val <= 0:
incr = -incr
val += incr
p.ChangeDutyCycle(val)
finally:
#GPIO.output(32,GPIO.LOW)
p.stop()
GPIO.cleanup()
if __name__ == '__main__':
main()
Above is our control code.
Following the same steps, we can successfully control pwm on the Jetson Xavier NX Devkit using the same steps and running the same script. But not on the ORIN NANO. The following error message will be displayed.
nvidia@nvidia:~$ sudo python3 gpio_test_pwm.py
WARNING: Carrier board is not from a Jetson Developer Kit.
WARNNIG: Jetson.GPIO library has not been verified with this carrier board,
WARNING: and in fact is unlikely to work correctly.
Traceback (most recent call last):
File "gpio_test_pwm.py", line 54, in <module>
main()
File "gpio_test_pwm.py", line 33, in main
p = GPIO.PWM(32, 1000)
File "/usr/local/lib/python3.8/dist-packages/Jetson/GPIO/gpio.py", line 478, in __init__
self._ch_info = _channel_to_info(channel, need_pwm=True)
File "/usr/local/lib/python3.8/dist-packages/Jetson/GPIO/gpio.py", line 113, in _channel_to_info
return _channel_to_info_lookup(channel, need_gpio, need_pwm)
File "/usr/local/lib/python3.8/dist-packages/Jetson/GPIO/gpio.py", line 107, in _channel_to_info_lookup
raise ValueError("Channel %s is not a PWM" % str(channel))
ValueError: Channel 32 is not a PWM
Exception ignored in: <function PWM.__del__ at 0xffff802afc10>
Traceback (most recent call last):
File "/usr/local/lib/python3.8/dist-packages/Jetson/GPIO/gpio.py", line 510, in __del__
if _channel_configuration.get(self._ch_info.channel, None) != HARD_PWM:
AttributeError: 'PWM' object has no attribute '_ch_info'
We are using the L4T35.3.1 system version.
Note that when I use similar python scripts to control the heights of other GPIOs, it works. And there will be the same warning.
How do I solve it?