QUERY · ISSUE
Calling i2c.scan() causes restart on Wemos D1 mini pro
bugport-esp8266proposed-close
The following code copied to REPL
from machine import Pin, I2C
i2c = I2C(sda=Pin(4), scl=Pin(5))
i2c.scan()
..results in device restart:
>>> i2c.scan()
ets Jan 8 2013,rst cause:2, boot mode:(3,6)
load 0x40100000, len 30716, room 16
tail 12
chksum 0xc8
ho 0 tail 12 room 4
load 0x3ffe8000, len 996, room 12
tail 8
chksum 0x06
load 0x3ffe83f0, len 1080, room 0
tail 8
chksum 0x11
csum 0x11
���2�N�{��N|�
l
d$l`B���
��r�l�N�
�n�
d ��{�p��l
l`�n�l�l�
l`��s�l
���
d$ rl��rl��"�|��B$b��B|����$$b��o�no��lo���$�ll����
d �o����cc
ld䌎�B���c
l�bsd{$r�o����|���c�܄$�r����
MicroPython v1.19.1-337-gbd4e45fd6 on 2022-08-26; ESP module with ESP8266
Type "help()" for more information.
Issue observed with the latest stable (v1.19.1 (2022-06-18) .bin) and also nightly build (v1.19.1-337-gbd4e45fd6 (2022-08-26) .bin).
The problem goes away when board is flashed with v.1.18 or when using Arduino IDE to scan I2C bus. Here's an example after flashing with 1.18:
MicroPython v1.18 on 2022-01-17; ESP module with ESP8266
Type "help()" for more information.
>>>
>>> from machine import Pin, I2C
>>> i2c = I2C(sda=Pin(4), scl=Pin(5))
>>> i2c.scan()
[]
HW info:
- Wemos D1 mini pro (clone), all pins unconnected
- connected via microUSB to a PC
Command used for flashing:
esptool.py --port /dev/ttyUSB0 --baud 1000000 write_flash --flash_size=4MB -fm dio 0 FILENAME.bin
CANDIDATE · ISSUE
ESP8266 IC2 Crash
bugport-esp8266
I am getting the same error as in this issue: https://github.com/micropython/micropython/issues/1996
from machine import I2C, Pin
i2c = machine.I2C(freq=9600,sda=Pin(4), scl=Pin(5))
i2c.scan()
This code causes a crash.
ets Jan 8 2013,rst cause:2, boot mode:(3,7)
load 0x40100000, len 30720, room 16
tail 0
chksum 0x90
load 0x3ffe8000, len 996, room 8
tail 12
chksum 0x80
ho 0 tail 12 room 4
load 0x3ffe83f0, len 1080, room 12
tail 12
chksum 0xf5
csum 0xf5
There is also this garbage text see the image:
- firmware file name: v1.19.1 (2022-06-18) .bin
- version information shown in the REPL: MicroPython v1.19.1 on 2022-06-18; ESP module (1M) with ESP8266
Does anyone know what is going on? I have nothing connected to pin 4 and 5.