Radomir Dopieralski eaef6b5324 extmod/machine_i2c: Use writes not reads in i2c.scan(). ...

As per discussion in #2449, using write requests instead of read requests
for I2C.scan() seems to support a larger number of devices, especially
ones that are write-only.  Even a read-only I2C device has to implement
writes in order to be able to receive the address of the register to read.

2016-10-11 15:30:46 +11:00

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