How can I make a program permanent on a Nucleo-L432KC #14460

garryp4 · 2024-05-09T21:10:42Z

garryp4
May 9, 2024

I am new to Micropython and trying to learn how to make a program permanent on the micro memory so it executes when powered on, The last 15 or so years I have built a number of circuits based on 8 bit Microchip PIC's and programmed in Basic. None of the circuits needed more horsepower than the 8 bit micro's. Now I need more horsepower so bought a Nucleo-l432kc to learn on. I have Micropython loaded using the STCube programmer and can do REPL all day. So far I have spent about 4 days trying to find how to make a file system on the micro so I can load main.py and execute it when it's powered on. I have tried rshel, mpfshell, storing on the micro with Thonny, os.mount, but have not gotten anywhere. Am I even approaching this the correct way?

Any help would be greatly appreciated.

AndreoBotelho · 2024-05-11T00:27:45Z

AndreoBotelho
May 11, 2024

On the linker file from the 256k flash it has there's 26k reserved to flash user storage, you can send files to it using shell ( I like to use thonny to send, edit and execute) or usb storage and import it from boot.py or main.py to execute ir automatically. There's too 2 spi buses that you can add a spi flash if you need store more than 26k data.

1 reply

garryp4 May 11, 2024
Author

I have had no success with Thonny, rshell, or mpfshell. How exactly is it done?

Here is mpfshell:
E:\MicroPython\Original File>dir
Volume in drive E has no label.
Volume Serial Number is 76FE-FFD3

Directory of E:\MicroPython\Original File

05/07/2024 10:07 AM

.
05/07/2024 10:07 AM ..
04/14/2024 10:27 AM .idea
04/14/2024 10:29 AM 305 boot.py
05/07/2024 10:07 AM 290 MAIN.PY
04/15/2024 09:07 AM 1,025,250 PYBV11-20240222-v1.22.2.hex
3 File(s) 1,025,845 bytes
3 Dir(s) 478,395,441,152 bytes free

E:\MicroPython\Original File>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> put boot.py

Failed to create file: boot.py

mpfs [/]>

Here is rshell:
E:\MicroPython\Original File>rshell -p com9
Traceback (most recent call last):
File "", line 198, in _run_module_as_main
File "", line 88, in run_code
File "e:\python312\scripts\rshell.exe_main.py", line 4, in
File "E:\Python312\Lib\site-packages\rshell\command_line.py", line 1, in
import rshell.main
File "E:\Python312\Lib\site-packages\rshell\main.py", line 80, in
import readline
ModuleNotFoundError: No module named 'readline'

E:\MicroPython\Original File>

Here is Thonny error:
PROBLEM IN THONNY'S BACK-END: Exception while handling 'write_file' (OSError: Could not open file /main.py for writing, output:
Traceback (most recent call last):

File "", line 4, in

OSError: [Errno 19] ENODEV).
See Thonny's backend.log for more info.
You may need to press "Stop/Restart" or hard-reset your MicroPython device and try again.

Process ended with exit code 1.

This code from Thonny executes on the NUCLEO-L432KC fine, I just can't store it in the Micro memory so it executes when it powers up:

import machine
import time

Define LED pin

LED_PIN = machine.Pin('PB3', machine.Pin.OUT)

Main loop

while True:
# Turn LED on
LED_PIN.on()
# Delay for 1 second
time.sleep(.2)
# Turn LED off
LED_PIN.off()
# Delay for 1 second
time.sleep(.2)

The NUCLEO-L432KC does not have a memory card slot. I chose this NUCLEO because it has a smaller micro. The circuit I will build doesn't need many pins.

Thanks

AndreoBotelho · 2024-05-11T17:16:57Z

AndreoBotelho
May 11, 2024

You can save files on "/flash" drive, it appears that you are trying to save on "/" root Em sáb., 11 de mai. de 2024 11:56, garryp4 ***@***.***> escreveu:

…

I have had no success with Thonny, rshell, or mpfshell. How exactly is it done? Here is mpfshell: E:\MicroPython\Original File>dir Volume in drive E has no label. Volume Serial Number is 76FE-FFD3 Directory of E:\MicroPython\Original File 05/07/2024 10:07 AM . 05/07/2024 10:07 AM .. 04/14/2024 10:27 AM .idea 04/14/2024 10:29 AM 305 boot.py 05/07/2024 10:07 AM 290 MAIN.PY 04/15/2024 09:07 AM 1,025,250 PYBV11-20240222-v1.22.2.hex 3 File(s) 1,025,845 bytes 3 Dir(s) 478,395,441,152 bytes free E:\MicroPython\Original File>mpfshell com9 Connected to pyboard ** Micropython File Shell v0.9.3, ***@***.*** ** -- Running on Python 3.12 using PySerial 3.5 -- mpfs [/]> put boot.py Failed to create file: boot.py mpfs [/]> Here is rshell: E:\MicroPython\Original File>rshell -p com9 Traceback (most recent call last): File "", line 198, in _run_module_as_main File "", line 88, in *run_code File "e:\python312\scripts\rshell.exe_main*.py", line 4, in File "E:\Python312\Lib\site-packages\rshell\command_line.py", line 1, in import rshell.main File "E:\Python312\Lib\site-packages\rshell\main.py", line 80, in import readline ModuleNotFoundError: No module named 'readline' E:\MicroPython\Original File> Here is Thonny error: PROBLEM IN THONNY'S BACK-END: Exception while handling 'write_file' (OSError: Could not open file /main.py for writing, output: Traceback (most recent call last): File "", line 4, in OSError: [Errno 19] ENODEV). See Thonny's backend.log for more info. You may need to press "Stop/Restart" or hard-reset your MicroPython device and try again. Process ended with exit code 1. This code from Thonny executes on the NUCLEO-L432KC fine, I just can't store it in the Micro memory so it executes when it powers up: import machine import time Define LED pin LED_PIN = machine.Pin('PB3', machine.Pin.OUT) Main loop while True: # Turn LED on LED_PIN.on() # Delay for 1 second time.sleep(.2) # Turn LED off LED_PIN.off() # Delay for 1 second time.sleep(.2) The NUCLEO-L432KC does not have a memory card slot. I chose this NUCLEO because it has a smaller micro. The circuit I will build doesn't need many pins. Thanks — Reply to this email directly, view it on GitHub <#14460 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AK4TXJ66WAJBKQ6MXIN4G53ZBYWRBAVCNFSM6AAAAABHPP5AJGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4TGOJWGIZDE> . You are receiving this because you commented.Message ID: ***@***.*** com>

0 replies

garryp4 · 2024-05-11T21:29:11Z

garryp4
May 11, 2024
Author

how can I do that? Thonny only has an option for 'This Computer and Mycropython Device. I tried this in mpfshell:

E:\MicroPython\Original File>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> put main.py /flash

Failed to create file: /flash

mpfs [/]>

0 replies

andrewleech · 2024-05-11T21:46:31Z

andrewleech
May 11, 2024
Collaborator Sponsor

Three official tool for this sort of thing is mpremote
https://docs.micropython.org/en/latest/reference/mpremote.html

mpremote cp main.py :

If this doesn't work, the filesystem on the device might need reformatting.

https://docs.micropython.org/en/latest/reference/filesystem.html

# STM32
import os, vfs, pyb
vfs.umount('/flash')
vfs.VfsLfs2.mkfs(pyb.Flash(start=0))
vfs.mount(pyb.Flash(start=0), '/flash')
os.chdir('/flash')

0 replies

garryp4 · 2024-05-11T22:19:06Z

garryp4
May 11, 2024
Author

This is from the Command Prompt:
E:\MicroPython\Original File>mpremote cp main.py :
cp main.py :
Traceback (most recent call last):
File "", line 1, in
OSError: [Errno 19] ENODEV

E:\MicroPython\Original File>

So in Thonny I entered this and ran it:

STM32

import os, vfs, pyb
vfs.umount('/flash')
vfs.VfsLfs2.mkfs(pyb.Flash(start=0))
vfs.mount(pyb.Flash(start=0), '/flash')
os.chdir('/flash')

and got this error:

%Run -c $EDITOR_CONTENT

MPY: sync filesystems
MPY: soft reboot
MPY: can't mount flash
Traceback (most recent call last):
File "", line 2, in
ImportError: no module named 'vfs'

I really do appreciate your help. I am so used to writing my code in basic, compiling, and flashing a hex file.

0 replies

andrewleech · 2024-05-12T00:03:04Z

andrewleech
May 12, 2024
Collaborator Sponsor

Ok, I don't use thonny, not sure if it's broken things.
However MPY: can't mount flash confirms the internal filesystem has been erased / corrupted somehow.

The instructions I pasted are for the current / latest micropython, vfs missing is a new module that your micropython must not have yet.

Try this

import os, pyb
os.umount('/flash')
os.VfsLfs2.mkfs(pyb.Flash(start=0))
os.mount(pyb.Flash(start=0), '/flash')
os.chdir('/flash')

0 replies

garryp4 · 2024-05-12T17:16:20Z

garryp4
May 12, 2024
Author

I get an error. Pasted from the Command Prompt window:

E:\Python312\Scripts>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> help

Documented commands (type help ):

EOF cd exec get lcd lpwd md mput mrm put pwd rm
cat close exit help lls ls mget mpyc open putc repl

mpfs [/]> repl

*** Exit REPL with Ctrl+Q ***

MicroPython v1.22.2 on 2024-02-22; NUCLEO-L432KC with STM32L432KC
Type "help()" for more information.

import os, pyb
os.umount('/flash')
Traceback (most recent call last):
File "", line 1, in
OSError: [Errno 22] EINVAL

0 replies

garryp4 · 2024-05-12T17:19:31Z

garryp4
May 12, 2024
Author

I did a REPL to verify the serial connection is good:

E:\Python312\Scripts>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> repl

*** Exit REPL with Ctrl+Q ***MicroPython
v1.22.2 on 2024-02-22; NUCLEO-L432KC with STM32L432KC
Type "help()" for more information.

print("hello")
hello

mpfs [/]> ^Z

E:\Python312\Scripts>

0 replies

garryp4 · 2024-05-12T18:00:57Z

garryp4
May 12, 2024
Author

I looked up what options I have with 'import os'. I found I can do some commands but not all. I'm not sure what it means tho. Another paste from the Command window:

E:\Python312\Scripts>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> repl

*** Exit REPL with Ctrl+Q ***
Micr
oPython v1.22.2 on 2024-02-22; NUCLEO-L432KC with STM32L432KC
Type "help()" for more information.

os.getcwd()
'/'
os.stat('/')
(16384, 0, 0, 0, 0, 0, 0, 0, 0, 0)
os.getenv('HOME')
Traceback (most recent call last):
File "", line 1, in
AttributeError: 'module' object has no attribute 'getenv'

0 replies

garryp4 · 2024-05-12T20:20:41Z

garryp4
May 12, 2024
Author

Now more information. I also happen to have a NUCLEO-G0B1RE. After loading the Micropython hex from GitHub, I opened Thonny and found that boot.py and main.py were already files on the micro. There is no external memory on this NUCLEO so the files need to be on the micro. Is andrewleech correct with"missing is a new module that your micropython must not have yet."?

1 reply

scruss May 12, 2024
Sponsor

maybe try pasting the lines in one at a time, and hit return at each so we can see which one caused an error.

It would also be really helpful is you enclosed your pasted text in three backticks before and after, as described in the Welcome (Please read before posting) post. Your output is very hard to follow

andrewleech · 2024-05-12T22:29:36Z

andrewleech
May 12, 2024
Collaborator Sponsor

As mentioned please try to post command prompt stuff in backticks to format them in a readable way.

From the commands I previously suggested, remove the line os.umount('/flash') and try the rest again. This particular one is just for when you have an existing filesystem mounted / being used.

That os.getenv command you tried doesn't exist on micropython devices, there's no environment as such there. Only desktop / unix port would have access to an environment.

0 replies

garryp4 · 2024-05-12T23:47:50Z

garryp4
May 12, 2024
Author

I did read the three backticks but was using the apostrophe. My mistake. Anyway, here is the attempt. After the 'REPL' I did a reset on the board just to make sure it was connected and gave response. Then a print to make sure Micropython was alive. Then, as suggested by andrewleech, I skipped the unmount command. You can see VfsLfs2 upset it.

E:\Python312\Scripts>mpfshell com9
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de **
-- Running on Python 3.12 using PySerial 3.5 --

mpfs [/]> repl

*** Exit REPL with Ctrl+Q ***
MicroPytho
n v1.22.2 on 2024-02-22; NUCLEO-L432KC with STM32L432KC
Type "help()" for more information.

>>> print('hello')
hello
>>> import os, pyb
>>> os.VfsLfs2.mkfs(pyb.Flash(start=0))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'VfsLfs2'
>>>

The reason I'm using the L432KC flavor is the circuit I intend to build once I learn enough does not need even close to 64 pins. It would not even use 32 pins. And I need to keep the real estate to a minimum. I really do appreciate the help.

1 reply

scruss May 13, 2024
Sponsor

I have a very different board (F4 Discovery), and it doesn't seem to have the vfs module or the os.VfsLfs2.* anything in the system. It does have os.VfsFat.*, though.

I notice that mpfshell uses the remote filesystem mount point as the prompt:

mpfshell ttyACM1
Connected to pyboard

** Micropython File Shell v0.9.3, sw@kaltpost.de ** 
-- Running on Python 3.10 using PySerial 3.5 --

mpfs [/flash]> pwd
/flash
mpfs [/flash]> repl
>
MicroPython v1.22.2 on 2024-02-22; F4DISC with STM32F407
Type "help()" for more information.
>>> 
*** Exit REPL with Ctrl+] ***

mpfs [/flash]>

This makes me think that your filesystem is at /, not /flash

andrewleech · 2024-05-13T02:57:34Z

andrewleech
May 13, 2024
Collaborator Sponsor

Ah ok, looking at that board config it's a bit old, has LFS1 enabled but not 2
https://github.com/micropython/micropython/blob/master/ports%2Fstm32%2Fboards%2FNUCLEO_L432KC%2Fmpconfigboard.mk

Can try again with VfsLfs1 instead or VfsFat is also probably enabled, though it's not as robust as LFS

0 replies

garryp4 · 2024-05-13T15:20:07Z

garryp4
May 13, 2024
Author

That did it! I flashed a program that blinks the LED, power cycled it, and the LED is flashing.

Thank you both so much. Now to get on with learning micropython. How can I tell how much flash memory there is?

0 replies

AndreoBotelho · 2024-05-13T15:41:37Z

AndreoBotelho
May 13, 2024

Use os.statvfs("/flash") that will return drive stats, use block size and free blocks stats to calc free space on device. Em seg., 13 de mai. de 2024 12:20, garryp4 ***@***.***> escreveu:

…

That did it! I flashed a program that blinks the LED, power cycled it, and the LED is flashing. Thank you both so much. Now to get on with learning micropython. How can I tell how much flash memory there is? — Reply to this email directly, view it on GitHub <#14460 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AK4TXJ7MFPERF5VHR7JCQWLZCDK33AVCNFSM6AAAAABHPP5AJGVHI2DSMVQWIX3LMV43SRDJONRXK43TNFXW4Q3PNVWWK3TUHM4TIMRSGQ3TE> . You are receiving this because you commented.Message ID: ***@***.*** com>

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MicroPython

How can I make a program permanent on a Nucleo-L432KC #14460

garryp4 May 9, 2024

Replies: 15 comments · 3 replies

AndreoBotelho May 11, 2024

garryp4 May 11, 2024 Author

I have had no success with Thonny, rshell, or mpfshell. How exactly is it done?

mpfs [/]>

E:\MicroPython\Original File>

Process ended with exit code 1.

Define LED pin

Main loop

while True: # Turn LED on LED_PIN.on() # Delay for 1 second time.sleep(.2) # Turn LED off LED_PIN.off() # Delay for 1 second time.sleep(.2)

AndreoBotelho May 11, 2024

garryp4 May 11, 2024 Author

andrewleech May 11, 2024 Collaborator Sponsor

garryp4 May 11, 2024 Author

E:\MicroPython\Original File>

STM32

andrewleech May 12, 2024 Collaborator Sponsor

garryp4 May 12, 2024 Author

Documented commands (type help ):

garryp4 May 12, 2024 Author

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scruss May 12, 2024 Sponsor

andrewleech May 12, 2024 Collaborator Sponsor

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Replies: 15 comments 3 replies

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May 11, 2024

garryp4 May 11, 2024
Author

while True:
# Turn LED on
LED_PIN.on()
# Delay for 1 second
time.sleep(.2)
# Turn LED off
LED_PIN.off()
# Delay for 1 second
time.sleep(.2)

AndreoBotelho
May 11, 2024

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