Skip to main content
4 votes
Accepted

What is the correct way to access GPIO on RPi?

"What would be the correct way of using GPIOs on the CM4?" This is strictly opinion based, and thus off topic. The strict (Linux kernel purist) answer is to use gpiochip interface. ...
Milliways's user avatar
  • 60.7k
3 votes

Pi CM4 - Additional UART enabling does not work

I know this was asked a while ago, but I think the answer is simple. You have dtoverlay misspelled everywhere except uart0. Try changing this: dtoverlay=uart0 dtovleray=uart2 dtovleray=uart3 dtovleray=...
josh798's user avatar
  • 31
3 votes

Price of compute module versus Pi Zero

The Raspberry Pi Zero is produced and distributed by the Raspberry Pi Foundation directly. The other Raspberry Pi boards have commercial partners involved with their sales. These partners improve the ...
scruss's user avatar
  • 9,077
3 votes
Accepted

Is it possible to power a Raspberry Pi (Zero/Compute Module) over an HDMI/MHL socket of a TV?

Sorry, but it's not possible. Maybe future HDMI standards could implement this, but not now. I guess we'll start using USB-C sooner. As for the Intel Compute Stick, if You see the images explaining ...
Mark's user avatar
  • 423
3 votes

Gadget Mode in Rpi Compute Module?

Look at this discussion on the Raspberry forum. Looks like gadget mode on the compute module requires a patched dwc2 driver.
tlhIngan's user avatar
  • 3,372
3 votes
Accepted

Stereo Vision Using Compute Module: Pi camera synchronization

The Pi Compute Module's stereoscopic support causes captures (and video recordings) to produce frames containing images from both attached cameras, either side-by-side or top-and-bottom, depending on ...
Dave Jones's user avatar
  • 3,978
3 votes

Frequent filesystem corruption (compute module, Raspbian)

In a nutshell, the RPi family of devices does not provide a method to keep power alive while finishing a write operation on the SD card. If during a power disconnection the memory card is in a ...
fcm's user avatar
  • 1,837
3 votes

What is the correct way to access GPIO on RPi?

You would probably be better served by using my lg archive of programs. C and Python are supported. The archive uses the new /dev/gpiochip interface rather than the deprecated sysfs interface used by ...
joan's user avatar
  • 71.3k
2 votes

Stereo Vision Using Compute Module: Pi camera synchronization

In May 2016 Lattice Semiconductor published a guide (2:1 MIPI CSI-2 Image Sensor Aggregator Bridge Demo) for a Raspberry Pi dev kit used with the CrossLink Master Link board featuring a Lattice LIF-...
Will's user avatar
  • 21
2 votes

Frequent filesystem corruption (compute module, Raspbian)

I found that using a read-only file system was a fine way of dealing with file corruption errors on classic Rpis. In your case, you may at least try to put the /boot partition in read-only mode. Edit ...
Technico.top's user avatar
  • 1,416
2 votes

remove uv4l "software by http://linux-project.org" watermark

Instead of using uv4l's raspicam driver to driver the raspberry pi camera, you can use the kernel-based bcm2835-v4l2 driver. Just modprobe it and enable it using raspi-config, and you should have a /...
Lior Okman's user avatar
2 votes

Is it possible to power a Raspberry Pi (Zero/Compute Module) over an HDMI/MHL socket of a TV?

It's not supposed to be possible, if you look at the specs. However, I've managed to do something similar, to some degree, with a Raspberry Pi 2/3 and a cheap HDMI to VGA converter. If I power the ...
YetAnotherRandomUser's user avatar
2 votes
Accepted

Will there ever be an updated Compute Module?

This is only the first link I found mentioning it, but yes a new compute module is planned and has been mentioned in several interviews with Eben Upton (head of the Pi Foundation - I don't think it ...
Steve Robillard's user avatar
2 votes
Accepted

raspberry pi compute module replication

Put out the SD Card from the compute module and plug it into a card reader attached to another linux computer. Assuming the SD Card is seen as /dev/sdb on the computer you create a complete image of ...
Ingo's user avatar
  • 42.3k
2 votes
Accepted

Composite video on Compute Module

Upon diving into the schematic of the compute module itself, the 15 Ohm termination resistor that's also present on the Zero is in fact included on the CM.
Joe Baker's user avatar
  • 141
2 votes

What is Reset state of GPIOs on Raspberry Pi Compute Module 4?

On boot ALL pins are INPUT. A few (1-9 from memory) have pull-ups, others pull-down. Shortly after power is applied pins are modified by Device Tree as configured in config.txt. It is possible to ...
Milliways's user avatar
  • 60.7k
2 votes

What is Reset state of GPIOs on Raspberry Pi Compute Module 4?

The table shows the default pulls which are applied by the hardware when the Pi is powered after being powered down.
joan's user avatar
  • 71.3k
2 votes

What is the correct way to access GPIO on RPi?

That gpio utility is part of WiringPi which was deprecated. There is an unofficial mirror: https://github.com/WiringPi Are you planning on developing something in a language such as Python or C ? I ...
CoderMike's user avatar
  • 6,997
1 vote
Accepted

Compute Module 4 and Camera Module v2.1 - How to configure?

Compute Module IO Board + Compute Module 4 Instructions: Connect Camera Module to Compute Module IO board using Raspberry Pi Zero Camera Cable Single Camera: sudo wget https://datasheets.raspberrypi....
user3728501's user avatar
1 vote

Anyone successfully managed to get the CM4 to boot directly from a PCIe SSD?

So it was fairly easy to follow the instructions for rpi-eeprom-update to install to the beta version the epprom code. Which is covered here:- https://www.raspberrypi.org/documentation/hardware/...
Simon Banks's user avatar
1 vote

Adding a LAN module to Compute Module 3

As of bump to 4.19.80 the w5500 driver exists, at least for SPI0. I did a short test with RPi Zero (Buster lite) and everything performed as expected. Name: w5500 Info: Overlay for the Wiznet ...
Rok Jarc's user avatar
  • 111
1 vote

Adding a LAN module to Compute Module 3

Does the driver exist ? Yes, there is a driver which was mainlined in version 5.3. Raspbian is currently using version 4.19, so you'll have to wait or build the driver yourself. Running rpi-update ...
Dmitry Grigoryev's user avatar
1 vote
Accepted

Compute Module 3+, using SD card on sd1

I was able to get it working by adding sdio_overclock=25 to the dtoverlay line to set the clock speed to 25mhz. That said, I am not sure if this is specific to the interface on the board, the SD card ...
Pathead's user avatar
  • 283
1 vote

Multiplexer vs RPI Compute Module for stereo camera?

The compute module allows 2 x 720p@30 fps. The multiplexer board does not allow simultaneous operation of multiple cameras, only a round-robin scheme. Switching between cameras will take some time and ...
flakeshake's user avatar
  • 6,203
1 vote

Stereoscopic capture (2 cameras) on Raspberry Pi 3?

I think there are a couple of options here but like anything else it depends on your use case. To have true simultaneous image capture you would need to have multiple pi’s. There is an interesting ...
Inflexionist's user avatar
1 vote

USB OTG on Compute Module 3

From the datasheet 9.4 USB The BCM2837 USB port is On-The-Go (OTG) capable. If using either as a fixed slave or fixed master, please tie the USB_OTGID pin to ground. The USB port (Pins USBDP and USBDM)...
Mats Karlsson's user avatar
1 vote

Flashing Raspberry Pi CM V1.1 on a proprietary board

By "proprietary Board" I'm inferring that you mean an IO board from a third-party- one that doesn't ship with the default compute module kit. I've flashed both the standard IO board that ships with ...
F1Linux's user avatar
  • 1,667
1 vote

Bluetooth UART on the Compute Module

Raspberry Pi 3B has Bluetooth disabled by default. If the Bluetooth is disabled, hcuiart service will fail to start and bluetoothctl will throw an error saying No default controller available To turn ...
Purush Pawar's user avatar

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