Questions tagged [compute-module-3]

For questions pertaining to the Raspberry Pi computer module 3.

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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 ...
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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?
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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.
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1answer
36 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 ...
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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 ...
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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 ...
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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 ...
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1answer
88 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?
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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'...
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1answer
43 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: ...
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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 ...
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62 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 ...
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171 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 ...
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1answer
109 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 ...
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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 ...
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23 views

Migrating From RPI 3A+ to CM3+ Lite

I'm migrating from the rpi-3a+ to a cm3+ lite because the product I'm making will be very small and the cm3+ is more for industrial purposes anyway. Ive decided for my case I will make a custom pcb ...
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167 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 ...
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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" ...
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1answer
177 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. ...
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143 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 ...
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27 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 ...
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38 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.
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1answer
596 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 ...
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1answer
550 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 ...
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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 ...
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202 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
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1answer
407 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 ...
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229 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 ...
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115 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 ...
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121 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 ...
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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 ...
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0answers
230 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 ...
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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 ...
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0answers
361 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 ...
2
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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 ...
3
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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 ...
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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 ...
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143 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 ...
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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 ...
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479 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 ...
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233 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 ...
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185 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 ...
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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 -> ...
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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 ...
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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-...
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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 ...
2
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1answer
800 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 ...
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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 ...
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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 ...
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0answers
117 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: ...