pyb & machine with I2C and STM32

[AutoPilotjn]

Suggestion.
I could not succeed in having pyb.i2c work with sending or receiving more than one byte. Indeed mem_read() did not return the proper bytes read, according to my trials.
Then I lately noticed that pyB.I2C shall be used for legacy I2C support only. Instead machine.i2c shall be used.
Maybe I overlooked at the documentaion, maybe I did not manage to make pyb mem_read & mem_write to work ?
In any case, may I suggest to make it clearer in the documentation that 'machine' shall be used ?
For the sake of clarity machine.i2c.writeto_mem() & readfrom_mem() work satisfactorily as described in the documentation.

[jimmo]

In any case, may I suggest to make it clearer in the documentation that 'machine' shall be used ?

Yes, this is the TODO list.

For the sake of clarity machine.i2c.writeto_mem() & readfrom_mem() work satisfactorily as described in the documentation.

OK that is good to hear. It is surprising that pyb.I2C was not working though as this is well-tested and has been in use for nearly 10 years. One thing to note is that machine.I2C supports "soft I2C" on any pin, and it's possible you're using it in that mode, whereas pyb.I2C was configured for the wrong pins.