Safe Mode: Hard fault: Memory access or instruction error / Internal watchdog timer expired.

[mario872]

CircuitPython version

Adafruit CircuitPython 9.2.3-14-g52b5b2da1a on 2025-01-26; Adafruit Feather ESP32-S3 TFT with ESP32S3

Code/REPL

import board
import time
import array
import pulseio

f = open("/codes.txt", "r") # https://github.com/mario872/Sonic-Screwdriver/blob/main/Software/src/codes.txt
# Just moved some lines around from https://raw.githubusercontent.com/adafruit/Adafruit_Learning_System_Guides/master/CircuitPython_TVBGone/codes.txt
input() # To make sure I can tell it when to start
count = 0
for line in f:
    code = eval(line)
    print(code)
    # If this is a repeating code, extract details
    try:
        repeat = code["repeat"]
        delay = code["repeat_delay"]
    except KeyError:  # by default, repeat once only!
        repeat = 1
        delay = 0
    # The table holds the on/off pairs
    table = code["table"]
    pulses = []  # store the pulses here
    # Read through each indexed element
    for i in code["index"]:
        pulses += table[i]  # and add to the list of pulses
    pulses.pop()  # remove one final 'low' pulse

    with pulseio.PulseOut(
        board.D13, frequency=code["freq"], duty_cycle=2**15
    ) as pulse:
        for i in range(repeat):
            pulse.send(array.array("H", pulses))
            time.sleep(delay)

    time.sleep(code["delay"])
    count += 1

Behavior

When running the above code it gets around 3-6 repeats in then I get:

Auto-reload is off.
Running in safe mode! Not running saved code.

You are in safe mode because:
CircuitPython core code crashed hard. Whoops!
Hard fault: memory access or instruction error.
Please file an issue with your program at github.com/adafruit/circuitpython/issues.
Press reset to exit safe mode.

Interestingly, when I run a more complicated program, with this script basically as a function instead, I get:

Auto-reload is off.
Running in safe mode! Not running saved code.

You are in safe mode because:
Internal watchdog timer expired.
Press reset to exit safe mode.

Description

N/A

Additional information

Running a very similar script on the RPi Pico 2 W didn't produce any error less than two weeks ago (with that build of CP from two weeks ago

Edit: Here's the longer program code: https://github.com/mario872/Sonic-Screwdriver/tree/main/Software/src/v5.3
Edit 2: Changing the pulseio.PulseOut line to:

pulse.deinit()
time.sleep(0.01)
pulse = pulseio.PulseOut(board.D13, frequency=code["freq"], duty_cycle=2**15)

Makes it work until line 128 of codes.txt, until it gives this error:

{'index': [0], 'freq': 6961, 'delay': 0.33, 'repeat': 2, 'repeat_delay': 0.127, 'table': [[143]]}
Traceback (most recent call last):
  File "test.py", line 34, in <module>
espidf.IDFError: Invalid argument

Then is goes into safe mode. Edit 4: (Hard Fault: memory access or instruction error)
Edit 3: It appears that then removing any line with an index of [0] fixes that issue, then changing the time.sleep(0.01) to time.sleep(1) stops CP from crashing at all.
Edit 5: There are no lines with and index of [0] until line 128, and with no delay it fails way before then.