nRF52: a new I2C instance does not deinit the previous
Came across this issue when testing the nrf port on an eByte E73-TBB (nRF52832).
If you construct an I2C instance eg.
i2c = I2C(0, scl=Pin(4), sda=Pin(3))
Then reconstruct with different pins:
i2c = I2C(0, scl=Pin(3), sda=Pin(4))
The new i2c instance is still configured with previous pins.
If you soft reboot and construct a new i2c instance with any pins, it still keeps using the first pins you defined.
A hard reboot is the only way to reset it.
Related forum topic:
https://forum.micropython.org/viewtopic.php?f=12&t=9400
NRF port - I2C
Hi,
Did anyone test I2C on the NRF port?
I am using NRF52 DK. I connect the SDA and SCL to 26 and 27 pin on the board.
When I run i2c.scan(), I get [] - an empty list. If I connect the same sensor to esp32 (also running micropython), i2c works as it is supposed to, and I can communicate with the sensor.
Is there anything else I should set on NRF52 DK, besides just connecting the SDA, SCL, and GND and VDD from the sensor to the board; and assigning sda and scl pins through machine.i2c?
>>> import machine
>>> i2c = machine.I2C(scl=machine.Pin(27), sda=machine.Pin(26))
>>> i2c.scan()
[]
>>>
I am running MicroPython v1.10-150-gf8f272429 on 2019-03-03; PCA10056 with NRF52840.
Thanks!