Questions tagged [compute-module-3]
For questions pertaining to the Raspberry Pi computer module 3.
59
questions
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28 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 ...
0
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1answer
34 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 ...
0
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1answer
36 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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17 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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0answers
10 views
external eMMC doesnt get detected
my setup is an IO Board V3.0 with an CM3L. I have an external eMMC + Adapter i connected to the pins 22-27 of my IO Board.
Im using the raspbian buster (2020-05-27).
To connect the eMMC-adapter to the ...
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0answers
33 views
LAN_RUN device tree dt-blob.dts for LAN95XX
I have setup Compute Module 3+ with LAN9512 for ethernet port.
The only problem is the ethernet chip needs a pull_up for shutdown
I have connected GPIO31 to LAN_RESET in my circuit
I am trying to ...
0
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0answers
21 views
eMMC wont boot anymore
i already managed to boot from the eMMC once, so i know it should work.
my main goal is/was to boot from USB-Stick using the CM3+
I managed to do this using the CM3L module.
Here are the steps i took:
...
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0answers
32 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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0answers
40 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
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1answer
59 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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0answers
47 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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17 views
Issues in Flashing EMMC in Raspberry Pi Compute Module 3+ with usbboot with Ubuntu 16.04
I am trying to flash EMMC in a Raspberry Pi Compute Module 3+ using Ubuntu 16.04 by following this tutorial. I have done the following in my host system:
mkdir ~/RPI_CM3+
cd ~/RPI_CM3+
git clone --...
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0answers
23 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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0answers
43 views
What are the alt functions of GPIO FL0 FL1?
I am going through the raspberry pi compute module and deciding which gpio pins to use for status led and LAN_RUN for LAN9512.
Seems like GPIO 31 and 33 have the least important alternate functions.
...
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22 views
Help with LAN9512
I am designing compute module using LAN9512 for downstream Ethernet and USB ports
Which gpio should I use for RESET?
How to configure the device tree for it?
Do I need an EEPROM for LAN9512? If ...
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0answers
14 views
LAN chip selection help for Compute Module
I am designing CM3+ PCB for a product. CM3+ has same processor. So I am confused whether to use LAN7850 (1000 base) or LAN9512 (100 base).
With this compute module board I will be using 100 base ...
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0answers
25 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.
1
vote
1answer
295 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 ...
0
votes
1answer
178 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
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0answers
23 views
Need help with Compute Module 3 PCB development
I am designing a Compute Module 3 based PCB online on : Gumstix
I can download the CAD files and it automatically generates the device tree so it seemed convenient. I created a custom design and ...
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147 views
Why is i2c-bcm2835 trying to use GPIO pin 2
I am trying to understand, why is i2c-bcm2835 trying to use GPIO pin 2. As shown below.
[ 4.256474] gpio-28 (ffffffff.i2c): enforced open drain please flag it properly in DT/ACPI DSDT/board file
[ ...
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0answers
50 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 ...
2
votes
0answers
70 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
1answer
312 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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0answers
95 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
...
1
vote
0answers
49 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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82 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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0answers
24 views
CM3 - Moving system files into USB memory
I have a CM3 with 4GB eMMC, which is small and while CM3 cannot boot from an SD card, I was thinking of :
1 - Keeping the /boot files inside the eMMc.
2 - Having the rest of OS files (root directory)...
1
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0answers
49 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 ...
2
votes
0answers
145 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
1answer
1k 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 ...
3
votes
0answers
233 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
votes
1answer
751 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
1answer
4k 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
0answers
222 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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0answers
106 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 ...
2
votes
2answers
167 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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0answers
395 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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vote
0answers
188 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 ...
0
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0answers
133 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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vote
0answers
732 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 -> ...
0
votes
1answer
1k 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 ...
2
votes
0answers
370 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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vote
0answers
268 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
votes
1answer
642 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
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 ...
3
votes
0answers
407 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 ...
0
votes
0answers
116 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:
...
1
vote
1answer
518 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 ...
2
votes
2answers
1k 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 ...
