Reading I2C device cause I2c bus to lock up.

[Ajb2k3]

When I step though the following code:
from umachine import Pin, SoftI2C
i2c=SoftI2C(scl=Pin(0), sda=Pin(1), freq=400000)
i2c.scan()
i2c.writeto_mem(0x45, 0x00, b'\x00')
which should set the device into digital input mode but if I issues an i2c.read, I get ERRNO 19, the I2c bus locks up and I have to power down the ESP32-C3 to access the i2c bus again.
can anyone help?

[robert-hh]

Try other pins than GPIO0 and GPIO1. GPIO1 is used for the Serial communication to your PC.

[Ajb2k3]

OSError: [Errno 116] ETIMEDOUT
when using pins 8 and 10
And bus crashed

[Ajb2k3]

`>>> from umachine import Pin, SoftI2C

i2c=SoftI2C(scl=Pin(8), sda=Pin(10), freq=400000)
i2c.scan()
[69]
[hex(x) for x in i2c.scan()]
['0x45']
i2c.writeto_mem(0x45, 0x00, b'\x00')
i2c.readfrom(0x45, 4) `

This is the code I'm trying to use

[Ajb2k3]

[Errno 116] ETIMEDOUT
i2c.readfrom_mem(0x45, 0x20, 1)

[robert-hh]

No result in i2c.scan() or no activity on scl and sda? If you do a full power cycle, does that include the peripheral you are trying to talk to? If yes, can you try just to power cycle the peripheral? Alternatively, can you instead of power cycling just reset the ESP32.

[Ajb2k3]

Reset of the esp doesn't reset the unit, hmm so it could be an issue with the stm32f030 host in the unit?

[robert-hh]

That's why I asked.

[Ajb2k3]

hmm, I see if it the same with the additional units based off this unit. I already posted one unit by corrupting a register so will need to refresh it at some point.
All I have is a list of register and Arduino source code samples