Repository navigation
CircuitPython crashes with Internal watchdog timer expired. #9428
Description
CircuitPython version
Adafruit CircuitPython 9.1.0 on 2024-07-10; ESP32-S3-DevKitC-1-N32R8 with ESP32S3
Board ID:espressif_esp32s3_devkitc_1_n32r8
UID:C7FD1A1E82C7Code/REPL
import os
import rtc
import time
import ipaddress
import wifi
import socketpool
import board
import microcontroller
import adafruit_ntp
import neopixel
import binascii
from adafruit_httpserver import Server, Request, Response, POST
#
# Global setup
#
SYSNAME = os.uname().sysname
UNIQUE_ID = binascii.hexlify(microcontroller.cpu.uid).decode('utf-8').upper()
SSID = SYSNAME + '-' + UNIQUE_ID[-4:]
led = neopixel.NeoPixel(board.IO38, 1)
led.fill(0x000000)
#
# Connect to a local WiFi access point.
# Because this code is running in a CircuitPython 9 or later environment,
# it requires a settings.toml file be created with at least the following
# six lines:
#
# AP_SSID = "WIFI SSID"
# AP_PASSWORD = "WIFI PASSWORD"
# STATIC_IP = "IP4 dotted IP address"
# GATEWAY = "192.168.0.1"
# TZ_OFFSET = -4
# DEBUG = "True"
#
# DEBUG can be either True or False.
#
wifi.radio.hostname = SSID
wifi.radio.connect(os.getenv('AP_SSID'), os.getenv('AP_PASSWORD'))
pool = socketpool.SocketPool(wifi.radio)
ntp = adafruit_ntp.NTP(pool, tz_offset = os.getenv('TZ_OFFSET'))
rtc.RTC().datetime = ntp.datetime
server = Server(pool, "/static", debug=os.getenv('DEBUG'))
def get_date():
dayname = [
"Monday",
"Tuesday",
"Wednesday",
"Thursday",
"Friday",
"Saturday",
"Sunday",]
monthname = [
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December" ]
try:
now = time.localtime()
return f"{dayname[now.tm_wday]}, {now.tm_mday} {monthname[now.tm_mon-1]} {now.tm_year} - {now.tm_hour:02}:{now.tm_min:02}:{now.tm_sec:02}"
except Exception as e:
return f" >>> EXCEPTION {e}"
# The HTML page body is a Python 3 'f' string for advanced formatting.
#
# Double curly braces {{ and }} are used when HTML needs single braces for HTML
# page elements such as CSS styling.
#
def webpage():
global SSID
font_family = "sans-serif"
html = f"""
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-type" content="text/html;charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="icon" href="data:," />
<style>
html{{
font-family: {font_family};
background-color: #FFFFFF;
display:inline-block;
margin: 0px auto;
text-align: center;
}}
h1{{
color:#D35F8D;
word-wrap: break-word;
font-size: 35px;
}}
h2{{
color:#D35F8D;
word-wrap: break-word;
font-size: 20px;
}}
p{{
font-size: 1.5rem;
word-wrap: break-word;
}}
button{{
font-family: {font_family};
display: inline-block;
width: 99%;
border: none;
border-radius: 4px;
color: white;
padding: 16px 40px;
text-decoration: none;
font-size: 30px;
margin: 2px;
cursor: pointer;
}}
.button-red{{
background-color: #DC143C;
}}
.button-green{{
background-color: #228B22;
}}
.button-dark-gray{{
background-color: #404040;
}}
p.dotted {{
margin: auto;
width: 90%;
font-size:
25px;
text-align: center;
}}
</style>
</head>
<body>
<title>{SSID} LED Control</title>
<h1>{SSID}</h1>
<form accept-charset="utf-8" method="POST">
<button class="button-green" name="LED ON" value="ONG" type="submit">LED ON</button></a>
<button class="button-red" name="LED ON" value="ONR" type="submit">LED ON</button></a>
<button class="button-dark-gray" name="LED OFF" value="OFF" type="submit">LED OFF</button></a>
</form>
<h2>CircuitPython {os.uname().version}<br/>
{get_date()}</h2>
</body>
</html>
"""
return html
# Default route
#
@server.route("/")
def base(request: Request): # pylint: disable=unused-argument
return Response(request, webpage(), content_type='text/html')
# Determine which button was pressed and
# execute that button's associated action.
#
@server.route("/", POST)
def buttonpress(request: Request):
raw_text = request.raw_request.decode("utf8")
#print(raw_text)
#
#
if "ONG" in raw_text:
led.fill(0x006400)
#
#
if "ONR" in raw_text:
led.fill(0x640000)
#
# If the led off button was pressed...
if "OFF" in raw_text:
led.fill(0x000000)
return Response(request, webpage(), content_type='text/html')
try:
server.start(str(wifi.radio.ipv4_address))
print(f" Listening on http://{wifi.radio.ipv4_address}")
#
# If the server fails to start then reset the microprocessor.
# If there is a hardware failure then this can put the software into a
# boot loop. That's why the time.sleep(5) is there so that a Ctrl C can exit
# at the REPL during development.
#
except OSError as e:
print(f" !!! OSError: {e}")
print(" !!! OSError Exception, Waiting !!!")
time.sleep(5)
print(" !!! OSError Exception, Restarting !!!")
microcontroller.reset()
#
# DO NOT hard code the while loop as True,
# instead provide a test and exit if something goes wrong.
#
is_healthy = True;
while is_healthy:
try:
# Poll for incoming requests.
server.poll()
except Exception as e:
print(f' EXCEPTION {e}')
is_healthy = False
continueBehavior
When left to run unattended the board will stop executing, and any attempt to perform ^D to restart returns the following message at the REPL:
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.
Press any key to enter the REPL. Use CTRL-D to reload.
Description
Not only does this occur with the Espressif ESP32-S3 board, but it also occurs with the Raspberry Pi Pico and Pico/W with the same version of CircuitPython. It will also occur with CircuitPython 9.0.5, again with the boards listed above.
Additional information
No response
Activity
dhalbert commentedon Jul 13, 2024
Thanks. Is the failure also
Internal watchdog timer expired.on the Pico W?The plain Pico doesn't have wifi, so how did you make this run on the Pico? Or is that a typo?
How long does it take for the safe mode failure to happen?
Are you using the latest versions of the needed libraries?
wbeebe commentedon Jul 13, 2024
Yes it is.
It is a Pico/W only issue. I'm so used to including both versions of the Pico when I write about them. My apologies.
I can only say overnight. For example I went to bed around 11pm after checking it was still operational, then when I got up this morning a little after 6 am it was in safe mode.
Yes. Whenever I update I always pull the version of the libraries that match the CircuitPython version as well as the release date.
wbeebe commentedon Jul 13, 2024
BTW, this is what the code looks like when it's running. A view of the web page on my iPhone. Nothing fancy at all because I stripped out a lot for this test code.
dhalbert commentedon Jul 15, 2024
Could you post a redacted (hide password, SSID, etc.) version of your
settings.toml? I am interested in whether you have anyCIRCUITPY_...settings, or whether you only have the keys referenced above.wbeebe commentedon Jul 15, 2024
Just the four shown above. STATIC_IP and GATEWAY aren't needed, and I need to adjust the comment block accordingly.
dhalbert commentedon Jun 24, 2026
I believe this is the same potential bug as #9460. I tried reproducing error using the test program in #9460 (comment) on 10.3.0-alpha.3. I tried fetches every 5 minutes and every 1000 seconds (16.67 minutes), and could not reproduce the crash.
Since this is a really old issue, I'm going to close this for now. If you are still seeing this, could you open a new issuer with a reproducer? Thanks.