Questions tagged [compute-module-3]

For questions pertaining to the Raspberry Pi computer module 3.

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USB not working for CM4S

I used to work with CM3+ and I recently got some CM4S. I have an issue with it and I don't know what to think about it. Previous setup: I have a Compute Module IO Board Plus designed by WaveShare. ...
Bibibou's user avatar
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31 views

CM3 GPT Partition Table and U-Boot

I am working in yocto currently to develop an image for my compute module boards (both CM3 and CM4) , It was my understanding that using yocto I should be easily able to switch between the hardwares ...
Aidan Moss's user avatar
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61 views

How can I use my Raspberry Pi as a Bluetooth sink with AVRCP protocol?

I've been searching the internet for two days now and have made several attempts to use my Raspberry Pi (Computemodule 4) as a Bluetooth sink with AVRCP protocol. Unfortunately, I have come to no real ...
Manuel Neff's user avatar
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47 views

Is it possible to boot Rasberry Pi Compute Module 3+ from USB-drive?

Good day! I have a device with Raspberry Pi CM3+ and Debian 10 pre-installed in eMMC. I want to try changing the OS to something else. I have already tried changing /boot/config.txt by adding "...
TrueGrigo's user avatar
1 vote
1 answer
451 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 ...
piotrwest's user avatar
  • 111
-1 votes
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514 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 ...
shiv patil's user avatar
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1 answer
494 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 ...
Qasim ali's user avatar
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31 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 ...
weirdgyn's user avatar
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245 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 ...
Isaac Middlemiss's user avatar
1 vote
1 answer
45 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 ...
Bharata's user avatar
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379 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?
noobinmath's user avatar
2 votes
1 answer
314 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'...
Fl0v0's user avatar
  • 71
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1 answer
482 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: ...
JarMan's user avatar
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226 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 ...
user4992124's user avatar
1 vote
1 answer
595 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 ...
Martin Rioux's user avatar
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147 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 ...
user122606's user avatar
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471 views

Default i2c not working in compute module

I am trying to communicate with the two i2c devices using the gpio pins 0 and 1 for the first device and 1 and 2 for the second device. I can communicate to the i2c device using the gpio pins 0 and 1 ...
Arun Kumar K S's user avatar
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1 answer
234 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" ...
MG lolenstine's user avatar
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1 answer
778 views

Booting from USB using a CM3+

i would like to use an usb stick to boot from my CM3+, because i would like to test the eMMC with different file systems. I edited /boot/config.txt adding program_usb_boot_mode=1 but nothing changed. ...
Xenoshell's user avatar
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314 views

RPi CM3+ SDA0 & SCL0 not working

I'm having slight problems with the CM3+ module... I've written the dts overlay and got SCL1 and SDA1 working fine. The pins 28 and 29 should be SDA0 and SCL0 respectively, which is confirmed when I ...
MG lolenstine's user avatar
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71 views

Detection of Compute Module 3+ fails

i am having problems getting the CM3+ to show up on my Windows 10 64 bit OS. I connected the USB Slave to my Win10 machine and connected POWER IN to another USB Port (of a different machine, so just ...
Xenoshell's user avatar
1 vote
0 answers
141 views

Selectively disable i2c on Rasbian Buster

I want to disable i2c0 while keeping i2c1 active. Everything I can find either disables or enables both, but I haven't found a way to only activate one of them.
Dakkaron's user avatar
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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 ...
punyanagari's user avatar
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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 ...
thesillywhat's user avatar
1 vote
0 answers
119 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 ...
Qui-Gon Jinn's user avatar
2 votes
0 answers
502 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 ...
avg's user avatar
  • 121
2 votes
1 answer
505 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 ...
Alex Er's user avatar
  • 21
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0 answers
458 views

How do I setup the clock form pwm device tree overlay

I am trying to use pwm on GPIO pin 40 but I have been unsuccessful so far. I am using pwm as device tree overlay in my config.txt dtoverlay=pwm,pin=40 After that I tried performing the below actions ...
thesillywhat's user avatar
1 vote
0 answers
242 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 ...
Thomas O's user avatar
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188 views

Raspberry Pi Compute Module - VBAT SMPS schematic

I'm developing a PCB for a LiON battery powered portable device featuring the Raspberry Pi CM3+ compute module, but am having difficulty verifying my power budget for the system due to the datasheet ...
Peter Werle's user avatar
1 vote
0 answers
81 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 ...
A0n0t's user avatar
  • 11
3 votes
0 answers
470 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 ...
Steven's user avatar
  • 65
2 votes
1 answer
3k 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 ...
F1Linux's user avatar
  • 1,667
3 votes
0 answers
502 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 ...
Stormon's user avatar
  • 31
2 votes
1 answer
2k 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 ...
hultqvist's user avatar
  • 132
4 votes
1 answer
9k 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 ...
F1Linux's user avatar
  • 1,667
3 votes
1 answer
433 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 ...
Dakkaron's user avatar
  • 143
0 votes
0 answers
170 views

CM3 Two Camera Previews, one "hangs/freezes"

First time forum poster here, but I hit a wall in debugging this issue. Thank you in advance for any input! Issue: I am using two instances of raspistill preview for two hours on two Pi Cameras V2 ...
Naro's user avatar
  • 21
3 votes
2 answers
319 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 ...
user1273813's user avatar
0 votes
0 answers
647 views

Create Access Point in Latest Raspbian OS using Edimax EW-7811Un for compute module 3

I am trying to create an access point in compute module 3(and latest Raspbian OS) with the Edimax WiFi dongle. But it did not succeed to create. Anyone please help me to do that in the latest ...
Arun Kumar K S's user avatar
1 vote
0 answers
319 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 ...
Federico's user avatar
0 votes
0 answers
319 views

raspberry pi and ltc 2873 cufd (RS 232 and RS 485)

I have a raspberry pi compute module 3 on an I/O board in which gpio 12 is contolling the mode in ltc 2873. If it is ground it will be working in the RS 232 mode. so if I have to write something into ...
roshini's user avatar
  • 25
1 vote
0 answers
2k 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 -> ...
jiandingzhe's user avatar
2 votes
1 answer
5k 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 ...
Puffafish's user avatar
  • 171
2 votes
0 answers
495 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-...
Katte's user avatar
  • 121
1 vote
0 answers
373 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 ...
Marc Brooks's user avatar
2 votes
1 answer
1k 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 ...
9a3eedi's user avatar
  • 123
1 vote
1 answer
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 ...
seanlano's user avatar
  • 131
3 votes
0 answers
459 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 ...
Antonin B.'s user avatar
0 votes
0 answers
137 views

GPIO listener on Compute module 3 Pi4J

I am doing a project where I use a compute module 3 with Raspbian Jessi Lite, Java with the Pi4J lib version 1.2-SNAPSHOT. I'm trying to implement a GpioPinListenerDigital on the GPIO_23 like so: ...
lucblender's user avatar