Porting code Pico to STM32 #16942

Retro-Fitt · 2025-03-15T10:55:43Z

8000

Retro-Fitt
Mar 15, 2025

Hi,
I am a micropython beginner/noob. Just find out github discussions. I want to port this code to my pyboard
I tried on my PYBV11 clone and code didn't work.

First it complained about uart port:

MicroPython v1.24.1 on 2024-11-29; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>>
Traceback (most recent call last):
  File "boot.py", line 4, in <module>
ValueError: UART(0) doesn't exist
MicroPython v1.24.1 on 2024-11-29; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>>

I changed 0 to 1
uart = UART(1, 230400)

Now this error is gone but it gives PWM error:

Traceback (most recent call last):
  File "main.py", line 20, in <module>
AttributeError: 'module' object has no attribute 'PWM'
MicroPython v1.24.1 on 2024-11-29; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>>

So i added this lines in main.py:

from pyb import Pin, Timer
import time

And changed pinouts according to this:

# ## buttons
FAULT_PIN = "Y6"
PROBE_PIN = "Y7"
CLEAN_PIN = "Y8"

SPEED_PIN = "X8"
p = Pin(SPEED_PIN)
tim14 = Timer(14, freq=1000)
speed_pwm = tim14.channel(1,Timer.PWM, pin=p)

ADC_PIN = "X11"
adc_val = machine.ADC(ADC_PIN)

however now it gives this error:

Traceback (most recent call last):
  File "main.py", line 69, in <module>
  File "MCF8316A_drv.py", line 29, in __init__
TypeError: can't convert 'int' object to str implicitly
MicroPython v1.24.1 on 2024-11-29; PYBv1.1 with STM32F405RG
Type "help()" for more information.
>>> TypeError: can't convert 'int' object to str implicitly

Can anyone help?

peterhinch · 2025-03-17T13:55:59Z

peterhinch
Mar 17, 2025
Collaborator

The following runs without error:

import machine
from pyb import Pin, Timer
FAULT_PIN = "Y6"
PROBE_PIN = "Y7"
CLEAN_PIN = "Y8"

SPEED_PIN = "X8"
p = Pin(SPEED_PIN)
tim14 = Timer(14, freq=1000)
speed_pwm = tim14.channel(1,Timer.PWM, pin=p)

ADC_PIN = "X11"
adc_val = machine.ADC(ADC_PIN)

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peterhinch Mar 17, 2025 Collaborator

Retro-Fitt
Mar 15, 2025

peterhinch
Mar 17, 2025
Collaborator