RPico congeals/stop when using two cores and writing on the flash

[beyonlo]

Hello.

I'm using RPico with MicroPython version 1.19.1. I'm using the ready MicroPython firmware from the the download page: https://micropython.org/resources/firmware/rp2-pico-20220618-v1.19.1.uf2

This example write data on flash using core0 and use the core1 just for watch the pin_out

Code:

# This example write data on flash using core0 and use the core1 just for watch the pin_out
import time, gc, _thread, os
from machine import freq, Pin
freq(270_000_000)
print('Clock running at: {}'.format(freq()))
gc.disable()

system = os.uname()
print('{}: {}\n'.format('os.uname()', system))

global p_out
p_out = Pin(0, Pin.OUT)
p_out.off()

def write_data(msg):
    f = open('data.txt', 'w')
    res = msg
    res = f.write(res)
    f.close()
    return res

def core0():
    time.sleep(2)
    while True:
        gc.collect()
        time.sleep(0.5)
        msg = 'asdhaksd'
        res = write_data(msg)
        print(res, p_out.value())

def core1():
    while True:
        p_out.on()
        time.sleep_ms(1)
        p_out.off()
        time.sleep_ms(1)

_thread.start_new_thread(core1, ())

core0()

Output:

$ mpremote run rpico_th1.py 
Clock running at: 270000000
os.uname(): (sysname='rp2', nodename='rp2', release='1.19.1', version='v1.19.1 on 2022-06-18 (GNU 11.2.0 MinSizeRel)', machine='Raspberry Pi Pico with RP2040')

8 0
8 1
8 0
8 1
8 1
8 0
8 0
8 1
8 1
8 0
8 0
8 1
8 1
8 0
8 0
8 1  <- Congeals/stop here!

Ps 1: Sometimes the Bug happen, sometimes not. So, if Bug do not happen at the first time, just try more times. It is very easy to repeat until problem happen. If example do not congeals/stop, it will happen another Bug: watch the second value printed (pin value), it will stop to change. Ps 2: I tested in two different RPico to be sure that is not board problem Ps 3: If you invert the example: writing data on flash using core1 and use the core0 just for watch the pin_out, will be very worst, I mean, the problem always happen!

Thank you.

[jimmo]

freq(270_000_000)

@beyonlo !!!

Does this also happen at the rated 133MHz?

[beyonlo]

Hello @jimmo

Does this also happen at the rated 133MHz?

Yes. Below the test running at 133MHz.

Output:

$ mpremote run rpico_th1.py 
Clock running at: 133000000
os.uname(): (sysname='rp2', nodename='rp2', release='1.19.1', version='v1.19.1 on 2022-06-18 (GNU 11.2.0 MinSizeRel)', machine='Raspberry Pi Pico with RP2040')

8 1
8 1
8 0
8 1
8 1
8 0 <- Congeals/stop here!

[dpgeorge]

Fixed by 662dc8602bf0ab99332748d178b0e950189df9e7