Questions tagged [compute-module-3]

For questions pertaining to the Raspberry Pi computer module 3.

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7
votes
2answers
5k views

Compute Module 3 current/thermal profile

The Pi Foundation just announced the second iteration of the compute module, usefully called the Compute Module 3. In their press release they've dropped some fairly hand-wavey statements about the ...
4
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2answers
2k views

Compute module 3 ttyAMA0

just got my hands on the new CM3, flashed a fresh raspbian image on it and noticed ttyAMA0 is not there (it has been used for bluetooth since raspberry pi 3). the only way to get it back is to change /...
4
votes
1answer
445 views

getting two camera preview with raspberry pi compute module

You know raspberry pi compute module has two CSI camera inputs. I can connect two camera and activate both of them. I have a project with raspberry pi that I need to preview from both camera ...
4
votes
0answers
2k views

Can the Compute Module 3 support 240fps from the Pi Camera v2?

The Compute Module 3 supports CAM1 with 4x Lane CSI MIPI as does the official doc for the Sony IMX219 camera module. It has been explained in many places that the reason the standard Raspberry Pi ...
3
votes
1answer
6k views

How do I Flash (install) Raspbian on Raspberry Pi Compute Module 3 / 3+?

NOTE: This question & solution ONLY relates to Compute Modules 3 or 3+ with on-board eMMC storage. The "Lite" versions of these has NO eMMC Storage I'm working on a project involving prototyping ...
3
votes
2answers
239 views

CM3 both cameras recognized but stereo not working

I recently started to work with the CM3. When I start raspbian, I can check that both cameras are detected and supported. In addition, I can acquire an image/a video from each separately easily but I ...
3
votes
0answers
363 views

Trouble connecting USB devices with Raspberry Pi Compute Module on custom PCB

I am working with a team designing a PCB that works with the Raspberry Pi Compute Module 3 card. We are having a bit of trouble with the USB ports. The schematic of the USB portion is somewhat similar ...
3
votes
0answers
283 views

Read/Write LAN9512 EEPROM

We are building a device around the Compute Module 3 and since it needs internet access we decided to go with the LAN9512 that was also used in the Raspberry Pi earlier. The LAN9512 requires an ...
3
votes
0answers
427 views

Mass deployment on Raspberry Compute Module 3.0

I am looking for the easiest method to backup/restore/mass deploy the raspberry compute module. (1000+ pcs) I though about creating an image with raspbian and opencv but I still need to connect the ...
2
votes
1answer
2k views

How do I boot a Compute Module 3+ Lite?

I bought a Raspberry Pi "Compute Module 3+ Development Kit" which includes a Compute Module 3+ Lite (CM3l). Unlike the standard Compute Module 3+ that's included in the kit, this has no on-board eMMC ...
2
votes
1answer
409 views

Raspberry Pi Compute WiFi module via USB

I am designing a board around the RBp Compute and would like to add WiFi connectivity to this device. However, I do plan on using USB 2.0 for its datarate (e.g. to send and receive images), so the ...
2
votes
1answer
1k views

Enable mini UART on CM3

I wan't to enable the mini UART on a CM3 for Linux console access in emergency cases. The full UART will be used for other purposes. With a newly flashed CM3 I can access the Linux console using ...
2
votes
2answers
2k views

How can I enable both the cameras on the Compute Module 3?

I am new to using Raspberry Pi devices. I have a problem with enabling the cameras on the Compute Module 3. When I run 'vcgencmd get_camera' I get the output 'supported=1, detected=1'. The ...
2
votes
1answer
11 views

Raspberry Pi Compute Module 3+ and IO Board does not detect any USB devices on Yocto Poky

I have a Raspberry Pi Compute Module 3+ mounted on an IO board running Yocto Poky with linux 5.10.17-v7. I've installed different usb modules and libraries trying to make CM3 detect connected USB ...
2
votes
0answers
77 views

What is the impact of setting gpu_mem=16 using the vc4 kms driver? (compute module 3+)

If i understood correctly, the kms driver (vc4-kms-v3d) uses a dynamic memory split which can be set via the 'cma' parameter in cmdline.txt This means the less memory i assign to the gpu with 'gpu_mem'...
2
votes
0answers
206 views

Load CPU at a specific % with stress-ng

I'm trying to achieve a 50% CPU load on my Pi to run thermal tests on it since that's what I expect the CPU usage to be with the real application. So far I've been playing around with stress-ng and ...
2
votes
0answers
231 views

SPI0 and UART0 interference caused by SPI interrupt

I have a raspberry CM3 running a custom Linux version created by buildroot (kernel: 4.19.44-v7). The CM3 is configured to be part of a measurement system that is used on a quad-bike (so a lot of ...
2
votes
0answers
427 views

64bit distribution on compute module 3

I'm trying to run a 64bit distribution on Raspberry compute module 3. I've found that Arch linux have a 64 version of his distribution ( https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-pi-...
2
votes
1answer
808 views

Raspberry Pi Compute Module 3 and IO Board does not detect USB device if it's plugged in before booting

I have a Raspberry Pi Compute Module 3 mounted on an IO board, connected to a (powered AFAIK) USB hub full of devices, and running Ubuntu MATE 16.04.2, with the X server disabled. I've noticed that ...
1
vote
1answer
113 views

Opening multiple serial port slows down USB speed

note that this is a duplicate of my question on stackoverflow I am currently working on a software that use Python3 (pyserial) to interface with a lot of serial port (~24) on a Raspberry Pi Compute ...
1
vote
1answer
2k views

I2C bus 0 not working, I2C bus 1 is

I am using both the i2c-0 and i2c-1 busses on my raspberry pi compute module 3. I can use i2c-1 no problem. Full comms, can probe the line and see good signals, get good signals back and the good old ...
1
vote
1answer
47 views

Imager fails to write to CM3 eMMC

I am trying to flash an image onto a Compute Module 3+ with onboard eMMC using the CM I/O board. The process seems straightforward, but I'm running into an error. Here are the steps I'm taking: ...
1
vote
1answer
598 views

Ethernet chip for Raspberry pi Compute Module 3+?

I am designing a base board PCB for CM3+. According to the datasheet the processor used is BCM2837B0 which is the same as Raspberry pi 3B+ LAN7515 chip is used in raspberry pi 3b+ which is 1000 base ...
1
vote
0answers
13 views

how to write data on the emmc of the Compute module 3+ in read only mode

I am working on the Compute Module 3+ with 32GB emmc.i want to write data on emmc in read only mode so my data will be safe incase of any power failure etc.
1
vote
1answer
37 views

Can we read the emmc flash of the compute module 3+

As we can read the data from the sd card.but in compute module 3 plus there is choice between sd card and emmc. if we flash the raspbian os on the emmc and make changes on it then do we read that ...
1
vote
1answer
31 views

How to monitor wifi network connection from raspi to linux PC [closed]

I have several raspberry pi CM 3B+ in a custom device. I use USB dongle as wifi adapter. After some time passed, the connection became unstable and it often cannot even reconnect and need to be ...
1
vote
0answers
71 views

Raspbarry pi cm3+ lite sd-speed

I managed to get the board booting from sd-card, but I noticed when I use the regular pi 3+ my boot times are much faster, in fact 1,5 times faster. I have tinkered with the config.txt file, trying to ...
1
vote
0answers
116 views

Full KMS causes blank screen on Pi 3 Compute Module

I am currently using a Pi CM3 on a custom PCB. The board boots fine with a desktop using fake KMS, but when using full KMS, no image is present. Boot image appears but once at desktop there is no ...
1
vote
0answers
57 views

Problem with reflashing the compute module 3

I got the CM3 for it's size and power and I'm pretty new with how it works, so I got the CMIO v1.2 dev board the one without the sd card slot. I plugged it in, installed the windows driver (I'm ...
1
vote
0answers
235 views

180 panoramic based on multiple cameras

Need some help please :) I would need some help to find the best option for a product upgrade. Right now, it consists of a Raspberry Pi 3 B+ with the Camera Module v2 and an external mobile ...
1
vote
0answers
1k views

How to login compute module via serial port?

I tried to login to compute module 3 io board from a USB serial port in my PC, but PUTTY just hangs there. Following procedures have been made: raspi-config -> interface options -> serial port -> ...
1
vote
0answers
313 views

CM3 - How can I use USB_OTG on carrier board? How does this differ from CMIO board?

Currently trying to figure out how to setup USB_OTG on the CM3 using my carrier board. I posted on the RPI forums and got an answer which was to connect pin 4 (ID) on a usb micro AB connector ...
1
vote
1answer
3k views

Compute Module 3 BCM43364 WiFi via SDIO

I have a Murata 1FX evaluation kit, and I'm attempting to use it to get WiFi working on a Compute Module 3 (with the CMIO board). It uses the Broadcom BCM43364 chipset, which is similar to what the ...
1
vote
1answer
544 views

MongoDB's Date() method returning Unix Epoch instead of actual date

I have a node app running on a Comfile Pi, which is a RPi Compute Module 3 mounted in the back of a touch screen interface. I'm gathering and storing data using MongoDB, which is running in the ...
1
vote
0answers
727 views

Protecting the on-board flash memory content on Raspberry Pi 3 SOM

I'm using the Raspberry Pi Compute Module 3 (CM3) in my latest hardware product for networking and user interface function, as it has small form factor and solid availability (until 2023 according to ...
1
vote
0answers
249 views

Connect 2 compute modules with networking

I've recently acquired 4 Raspberry Pi Compute Module 3's. I plan to develop a Circuit board that has built in networking, to allow both compute modules to talk to one another across a local network. ...
0
votes
1answer
558 views

unable to add wwan0 to bridge

I am trying to add the interface wwan0 to a bridge. Currently I am unable to do that. When I run the command brctl addif br0 wwan0 can't add wwan0 to bridge br0: Invalid argument Any ideas why this ...
0
votes
1answer
64 views

Compute module CM3+ change GPIO 37 alt function

I am trying to switch the alt functions on GPIO36 and GPIO37 on CM3+. I installed and ran the pigpiod service. I find that for GPIOs greaters than 27 that pigs command returns "no permission to ...
0
votes
1answer
92 views

Gestures not working on FT5336

I'm new to the CM3+ module, but I've worked extensively with other RPi products. I'm currently trying to implement my own FT5336 driver, but I'm having some slight problems, as the "Gesture" ...
0
votes
1answer
616 views

How to use pin 36/37 as UART0 (ALT2) modifying device tree on CM3?

Those pins are defined in the datasheet. I investigated in the config.txt but cannot see any option for those. I only see it for pins 32/33 and 40/41. I then tried checking standard softwares as ...
0
votes
1answer
960 views

CM3 does not boot. ACT stays solid green

I've got a CM3 module which is working perfectly, and I received my second CM3 last week and I've been trying to clone the first to the second with no luck. I start with the first CM3 and ran: sudo ...
0
votes
1answer
602 views

Which displays can be operated with the Compute Module IO Board V3?

Are there displays that were developed to work with the DSI ports of the Compute Module IO Board V3? I am looking for color displays as well e-ink displays.
0
votes
1answer
41 views

Access Multiple I2C Ports on Raspberry Pi CM4

I am working on the Raspberry Pi Compute Module 4. I would like to implement the 2 I2C ports for the 2 different types of sensors. (must be accessed within a single application) I am using the I2C ...
0
votes
0answers
7 views

How to prevent reading data off the emmc of the compute module

I want to protect the contents of my eMMC flash so that it cannot simply be cloned by a third party. Is there a way prevent the PI from letting anyone read the contents of its on-board storage?
0
votes
0answers
20 views

CM3+ and RaspiCam V2 issues

I'm trying to use two RaspiCam V2 with CM3+ and Computer Module 3+ Development Kit board. I followed instructions provided in official links: Raspberry Pi OS with desktop and recommended software ...
0
votes
0answers
26 views

How to clone a Pi that has flash instead of an SD card

I'm working with the Pi CM3+, which has 32GB of flash memory (at least my specific one does). While of course it needed an image on an SD card to initially boot, since then it has been operating ...
0
votes
1answer
92 views

Raspberry pi compute module 4 io board and compute module power on with PoE

I have rpi cmb4 and I want to power on rpi with using PoE. I don't know how should I do. I tried to just connect ethernet cable to rpi but rpi was still closed. Is there any idea?
0
votes
0answers
16 views

Compute modul 3 eMMC kernal panic

I copied the image to the compute module and ran it. However, kernel panic occurred as shown in the picture below. It does not appear even if I connect to the computer to copy the image again. Do you ...
0
votes
0answers
63 views

How to clone an OS image and configuration from one Compute Module to another

A RPi Compute Module 3+ is used in a headless application for a client. The preparation of the module includes the following: Load Raspbian Buster OS, using USBBOOT utility, on off-the-shelf modules ...
0
votes
0answers
172 views

No sound with Jitsi Meet and ALSA

For a project I'm using a Raspberry Pi with ALSA. ALSA is configured and speaker-test provides me audio output. However, when I open Jitsi Meet in Chromium, there is no sound. When I open YouTube in ...