Skip to main content
Share Your Experience: Take the 2024 Developer Survey
1 vote

Connecting RPi 4 to Cyclone II

You can assign rx and tx to any GPIO pins on the CycloneII, just make sure that the I/O bank you are using uses the same voltage as the RPi. You will also need a mechanism to write a bitstream to the ...
Simon Richter's user avatar
1 vote

Is it possible to supply power to Raspberry Pi 4 using gnd on pin 9?

Can I use the 9th pin for GND for Raspberry instead of the 6th? Or maybe any other GND pin? Is it designed for this? Yes - GND is GND (or Ground is Ground... or Ground is GND :) All Ground pins are ...
Seamus's user avatar
  • 22.2k
1 vote
Accepted

Can I sink the 5V+ pin into a GPIO in open drain mode?

libgpiod is a hardware independent interface to the GPIO driver. AFAIK the Pi SoC do not support open drain the pin is either INPUT or OUTPUT. The Pi is a 3.3V device so connecting a pin to 5V risks ...
Milliways's user avatar
  • 60.3k
1 vote
Accepted

RPi4 / BCM2711 Startup GPIO timing

AFAIK, the timing behavior you've observed is not documented anywhere. This is not surprising because the Raspberry Pi organizations and Broadcomm treat the firmware as proprietary. And so, while the ...
Seamus's user avatar
  • 22.2k

Only top scored, non community-wiki answers of a minimum length are eligible