I am trying to build a linux image for raspberrypi3 with buildroot and run it on qemu.
Once the make process is done i can copy the sdcard.img file into a SD card and correctly run the OS on a real raspberry pi device without any issue.
but when i try to use the same image file and try to run it on qemu the bootup fails.
qemu-system-aarch64 -M raspi3 -kernel zImage -dtb generated dtb -sd generated .img
=> qemu window opens but blank. nothing on the terminal as well.
qemu-system-arm -M raspi2 -kernel zImage -dtb generated dtb -sd generated .img
=> qemu window opens. raspberry image appears on top left corner. but in the teminal window there is a kernel panic. VFS mount failed
same as 1st step but with a freshly compiled qemu from source => same as 1st step. nothing on the qemu window or in the terminal.
am i doing something wrong?
After few days of googling around a lot i found the answer to my issue.
The Kernel image zImage I use in the terminal command which is built by the buildroot make process is not compatible with the QEMU.
To solve that I had to compile my own QEMU compatible raspberry pi kernel.
I followed this link to compile my own kernel. raspberry pi cross-compile kernel
then when I used QEMU to run a OS there was another kernel panic saying VFS mount failed. When I read the terminal outputs before that, it says not enough space on the media. So expanded the scared.img file to 1G and ran the same terminal command.
Now the QEMU is running perfectly
Using the same kernel image for both these command lines is definitely wrong. raspi3 needs a 64-bit kernel, and raspi2 needs a 32-bit one.
Your command line appears to be missing the argument to the '-dtb' option, and also may be missing an '-initrd' option passing the initial ramdisk, and an '-append' option passing the kernel suitable command line arguments including the correct device to use for the root filesystem.
Related
I would like to use a DHT11 and I have downloaded the git repository for the library from Adafruit. I know how to add libraries using Thonny, but I am coding my Pico on a headless pi zero over ssh so I need a way to install libraries from the command line or rshell.
Do any of you know how to do this?
thanks!
The answer is to run rshel on the host rshell -p /dev/ttyACM0 --buffer-size 512 and then just copy the module to /pyboard/lib/. Then run repl and do a CTL + d to soft reboot the Pico.
I recently bought raspberry pi pico and I follow the How to get started with raspberry pico in C/C++ tutorial, but I have only windows computer. I want to debug my pico with usb. I compiled the example hello world project with cmake usb configuration (as shown in tutorial) and draged a usb/hello_usb.uf2 file to pico. Also there is a elf file for debugger, but I have no idea, what to do with it. Only thing about connecting pico usb stdout to computer, that I found in tutorials and datasheets is this command for minicom:
$ minicom -b 115200 -o -D /dev/ttyACM0
Unfortunately minicom is only available for Linux, but I found out what different parts of that command means:
Port: /dev/ttyACM0
Baud rate: 115200
-o means that minicom doesn't initial setup (I don't exactly know what it is)
And I tried to enter these informations to puTTY:
I tried a lot of other combinations of values that are not specified in that command (On screenshot is config for some arduino board, that I found), but I always just heard windows fail tone. All stuff I do and describe here might be wrong, I am a beginner, but I didn't found a good source of information about this.
Should I use something else (not puTTY)?
EDIT:
I got it! I did some mistakes during sdk setup and tinyUSB didn't work, so I couldn't even see pico in device manager. I did the whole setup again and everything works now. I also found video, how to connect pico via putty: https://youtu.be/BjGc60Mmwz8 . Also as aMike said, you have to type just com port to puTTY, not /dev/ttyACM0.
Thats not really debugging. Putty is just a serial monitor for getting printf() from your Pico device. For real debugging abilities (breakpoints, variable watch etc..) and to understand how those .elf files work, check this project.
I have used the software Thonny to send programs to my raspberry pi pico. I am trying to make a specific program auto run when my pico is plugged in. At the moment another program which is on the pico auto runs but I want another program to run instead.
Name the program you want to run main.py
Tested on Rpi Pico W, Ubuntu 22.04 host.
Command line approach
Install the MicroPython firmware.
Download the latest prebuilt firmware, it is a UF2 file:
non-W: https://micropython.org/download/rp2-pico/
W: https://micropython.org/download/rp2-pico-w/
Plug the Pi USB to computer while holding the BOOTSEL button.
A filesystem should appear on host.
Copy the file into the filesystem. On Ubuntu it automounts something like:
cp ~/Downloads/rp2-pico-w-20221014-unstable-v1.19.1-544-g89b320737.uf2 /media/$USER/RPI-RP2/
When flashing ends, the filesystem automatically unmounts, leaving you in non-boot mode. The firmware has been installed.
Install your program as main.py on the board.
Ensure the board is not in boot mode:
after installing firmware, this happens automatically
otherwise just unplug the USB and plug it back in without holding the BOOTSEL button
Install rshell on host:
python3 -m pip install --user rshell
Copy your program to the board as main.py. Supposing you have a blinker program at blink.py in the current working directory, run:
rshell -p /dev/ttyACM0 --buffer-size 512 cp blink.py /pyboard/main.py
/pyboard is a magic path to rshell, not actually present on the host. Terrible API!!!
This is what I tested with:
import machine
import time
led = machine.Pin('LED', machine.Pin.OUT)
# For Rpi Pico (non-W) it was like this instead apparently.
# led = Pin(25, Pin.OUT)
while (True):
led.on()
time.sleep(.5)
led.off()
time.sleep(.5)
The main.py thing is documented e.g. at: https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/9
Unplug and replug the USB without holding BOOTSEL. Every time you do this, the main.py program starts running automatically.
After installing, you can also use rshell to check the contents of main.py with:
rshell -p /dev/ttyACM0 --buffer-size 512 cat /pyboard/main.py
Bibliography:
https://forum.micropython.org/viewtopic.php?t=3610
https://forum.micropython.org/viewtopic.php?t=6005
https://forums.raspberrypi.com/viewtopic.php?t=301927
Thonny editor UI approach
This is the procedure described on the official docs at: https://projects.raspberrypi.org/en/projects/getting-started-with-the-pico/0
It does the same steps as the CLI approach, but as usual with UIs making it more obscure what is actually happening behind the scenes :-)
Install Thonny:
python3 -m pip install --user thonny
Install the MicroPython firmware
Plug the Pico while holding BOOTSEL
Open Thonny from the command line:
thonny
I tested with version 4.0.1.
Click Python version on bottom right of the screen (bad UI)
Install MicroPython
MicroPython variant: Raspberry Pi Pico (choose W vs non W)
Install
Unplug the Pico, close Thonny, replug the Pico without BOOTSEL, reopen Thonny
Install your program as main.py on the board
Paste our blink.py on the main Thonny editor window
File > Save (or Ctrl + S)
A popup opens, choose: "Raspberry Pi Pico" (instead of "This computer")
Save the file as main.py on the Pico
Unplug USB and replug. main.py starts running.
I am trying to load a program on a Raspberry Pi Pico. Have loaded the standard blink program on it using USB connected to my Macbook and used Thonny to run and stop the program.
However if I disconnect the Raspberry Pi Pico, from the USB, the program disappears. I found this video (https://www.youtube.com/watch?v=IMZUZuytt7o) that shows how to make it work with a windows system, but if I try the same with Macbook does not work. It gets stuck at Trying to connect to REPL
Can someone suggest how we can flash the program on the Raspberry Pi Pico so that it stays whenever we connect it to power?
Here is the program I tried
import machine
import utime
led_onboard = machine.Pin(25, machine.Pin.OUT)
while True:
led_onboard.value(1)
utime.sleep(1)
led_onboard.value(0)
utime.sleep(.5)
I tried using the suggested RShell solution using pip install rshell. However it does not seem to work on macbook very well when it comes to copying the program to the pico. So I tried an alternate REPL writer called ampy
To install ampy follow the guide on https://github.com/scientifichackers/ampy
pip install adafruit-ampy
In your shell go to the folder where the program is stored. Keep the file name as main.py
Run ampy using the command
ampy -p /dev/cu.usbmodem0000000000001 put main.py
The format is
ampy –p [USB-Port] put [file to copy]
The file is now copied into the board.
Now if you unplug and re-plug the power source the program in main.py would execute.
The issue is as shown in the image below. The kernel runs but the output is not displayed.
For installation, I followed the steps under 'Python side configuration' and 'MATLAB side configuration' here.
Have tried the following:
All other kernels work normally
The issue persists in both Firefox and Chrome
Edit: There were no issues in the installation of the python engine.
sudo python3 setup.py install
[sudo] password for tinkidinki:
running install
running build
running build_py
running install_lib
copying build/lib/matlab/engine/_arch.txt -> /usr/local/lib/python3.8/dist-packages/matlab/engine
running install_egg_info
Removing /usr/local/lib/python3.8/dist-packages/matlabengineforpython-R2020b.egg-info
Writing /usr/local/lib/python3.8/dist-packages/matlabengineforpython-R2020b.egg-info
Most likely your antivirus program is blocking the output (e.g. Adaware antivirus often causes this problem).
If this is not the case: sometimes the output is shown in the command prompt window instead of in the Jupyter notebook, check if this is the case.
Try restarting the kernel in kernel option (yup, more of a workaround...)