ESP32: Timer and sleep cause hang
Port, board and/or hardware
ESP32_GENERIC-20250809-v1.26.0, NodeMCU ESP32-WROOM-32
MicroPython version
MicroPython v1.26.0 on 2025-08-09; Generic ESP32 module with ESP32
Reproduction
The following code causes the sleep() to hang consistently on iteration 254 on both esp32 boards I tested this on. After this hang any other call to sleep() will hang too, a hard reset is needed to recover.
from machine import Pin, Timer
import time
LED = Pin(2, Pin.OUT)
TIMER = Timer(0)
def blink():
LED.on()
TIMER.init(mode=Timer.ONE_SHOT, period=5, callback=lambda timer: LED.off())
i = 0
while True:
blink()
i += 1
print(f"Loop {i}")
time.sleep(0.01)
This code does not hang on v1.25.0.
Expected behaviour
The loop should run indefinitely
Observed behaviour
Hang on iteration 254
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree
ESP32-S3 PWM in lightsleep mode does not works as expected
Port, board and/or hardware
ESP32S3
MicroPython version
MicroPython v1.26.0 on 2025-08-09; Generic ESP32S3 module with ESP32S3
Reproduction
import esp32
from machine import Pin, I2C, ADC, Timer, PWM, deepsleep, lightsleep
from neopixel import NeoPixel
import time
# Internal Led
INTERNAL_LED = const(47)
PWM_PIN_NORMAL = 1
PWM_PIN_SLEEP = 12
# Init
LED = NeoPixel(Pin(INTERNAL_LED, Pin.OUT), 1)
# Test 26 Version
# On ESP32-S3 : the pwm_ligthsleep goes to 1 when ligthsleep
pwm1 = PWM(Pin(PWM_PIN_SLEEP), freq=5000, duty_u16=32768, lightsleep=True)
pwm0 = PWM(Pin(PWM_PIN_NORMAL), freq=5000, duty_u16=32768)
# Init : LED = Blue
LED[0] = (0,0,32)
LED.write()
time.sleep_ms(10*1000) # Wait 10 Sec
while True:
LED[0] = (32,0,0) # Green
LED.write()
time.sleep_ms(10*1000) # Wait 10 Sec
LED[0] = (0,64,0) # Red
LED.write()
lightsleep(10*1000)
Expected behaviour
The option set on the pwm1 instance (lightsleep=True) should keep the pwm signal on while the ESP32 is in ligthsleep.
But when performing the test we see that the pwm1 pin goes to high value when the ESP32 enter in ligthsleep.
Observed behaviour
I've worked on this subject (https://github.com/micropython/micropython/pull/10854) and (https://github.com/micropython/micropython/pull/16102). On my local repository, I reloaded an old firmware with the same machine_pwm.c (ESP port) code as in the current repository, and it is working as expected! I haven’t yet found the difference - maybe it’s related to the IDF framework version ?
Additional Information
No, I've provided everything above.
Code of Conduct
Yes, I agree