Raspberry Pi Pico 2 MicroPython problem

Works OK with:

for i in range(r, 1, -1):

It looks like this is the PR that implements MicroPython for Pico 2:

https://github.com/micropython/micropython/pull/15619

It may be worth leaving the detail there, so that the developer can check it out (otherwise it might not get resolved as quickly, until someone raises it as an issue).

That PR is still really fresh (just three days old) so unfortunately the issues you encounter are probably not experienced by others yet.

You can follow the problem discussion here:

Raspberry Pi Pico 2 · micropython · Discussion #15621 (github.com)

maybe it is some timing issue if print can be used as workaround? I wonder if replacing print with sleep would be equally effective...

# Colour Mixing Routine
def colour(R,G,B): # Compact method!
mix1 = ((R&0xF8)*256) + ((G&0xFC)*8) + ((B&0xF8)>>3)
return (mix1 & 0xFF) *256 + int((mix1 & 0xFF00) /256) # low nibble first

# ==== Main ====
pwm = PWM(Pin(BL))
pwm.freq(1000)
pwm.duty_u16(32768)#max 65535

LCD = LCD_1inch3()

LCD.fill(LCD.WHITE)
LCD.show()

'''
# Set up buttons
key0 = Pin(15,Pin.IN,Pin.PULL_UP)
key1 = Pin(17,Pin.IN,Pin.PULL_UP)
key2 = Pin(2 ,Pin.IN,Pin.PULL_UP)
key3 = Pin(3 ,Pin.IN,Pin.PULL_UP)
'''
centre_x =int(LCD.width/2)
centre_y = int(LCD.height/2)
R = int((LCD.width + LCD.height)/4)
r = int((LCD.width + LCD.height)/8)
LCD.fill(0)
LCD.show()

LCD.ellipse(centre_x, centre_y,R,r,colour(255,255,0),1)
LCD.show()
LCD.ellipse(centre_x, centre_y,r,r,colour(0,0,255))
LCD.show()

for i in range(r, -1, -1):

    LCD.ellipse(centre_x, centre_y,i+1, i+1,colour(i*5,i*3,i*4), 1)
    LCD.show()
    time.sleep(0.1)

time.sleep(1)
LCD.fill(0)
LCD.show()

gc.collect
print()
print(gc.mem_free())

There is already a time.sleep(0.1) in the loop. It did not help.

If I comment out the button/key setup lines it works properly.

I also tried the same code, with button setup lines on a RP2040 Pico Lipo and it works correctly.

I think it is the UF2 for the Pico 2 causing the problem

Hello! 

if it seems to hang consistently at the end of the loop, have you tried running standalone

LCD.ellipse(centre_x, centre_y, 2, 2,colour(2*5,2*3,2*4), 1)

(the last value of problematic range(r, 0, -1))

(but it will probably succeed if print in the loop remedies it).

It is strange that it seems to be connected with certain value (when range(r, 1, -1) is ok) and timing/whatever at the same time (when print can be used as a workaround)...

I do not think it is my loop. If I comment out the Button setup lines it works perfectly even with 

for i in range(r, -1, -1):

controlling the loop.

I've run the full code, including the button setup, with a Pimoroni Pico Lipo (RP2040) and it works perfectly. You are supposed to be able to just substitute a Pico 2 for a Pico 1 and the same code should work.

I think the new Pico 2 .UF2 is the problem.

Once again the hardware is available ahead of the essential software as a proper release is not yet available. The current version is a preview (9th Aug 2024).

Hello! I was not suggesting it is something in the code, only wanted to identify the precise point/conditions when the hang happens

Thank you, I will give it a try.