Python GPIO Library for the Rock64 (R64.GPIO)
#10
I'd like to report my test on the interrupt of the GPIO, I wish this will be help for the development.


Hardware : Rock64 4GB (Rock64 V2 2017-0713)
Software : bionic-minimal-rock64-0.6.31-209-arm64 (kernel 4.4.120).


I tried interrupts with gpio-int-test.c on physical pin 16 (GPIO3_A5):
Code:
root@rock64:~# ./gpio-int-test 101

poll() GPIO 101 interrupt occurred
..
poll() GPIO 101 interrupt occurred

It had responses, but I found the followings :
  1. once gpio-int-test started, pin 16 had already been pulled-up internally to 3.2 V.
  2. it was difficult for me to pull-down the pin. With a 20K resistor pull-down to ground, interrupt was triggered repeatedly. With a 10K resistor, pin voltage became 0.443V, and it became more stable. When I opened the 10K resistor, interrupt was triggered.

The problem is : 
10K pull-down resistor is quite small, and even with the 10K resistor, the pin voltage is still 0.443V, not close 0V. There should be something wrong.
  Reply


Messages In This Thread
RE: Python GPIO Library for the Rock64 (R64.GPIO) - by edupv - 04-11-2018, 10:02 PM

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