The RP2040 I2C hardware can do writes of length 1 and 2, just not of length
0. So only use software I2C for writes of length 0, to improve
performance.
Also increase the software I2C timeout for zero-length writes to
accommodate the behaviour of a wider range of I2C devices.
Fixes issue #8167.
Signed-off-by: Damien George <damien@micropython.org>
This commit adds a new port "rp2" which targets the new Raspberry Pi RP2040
microcontroller.
The build system uses pure cmake (with a small Makefile wrapper for
convenience). The USB driver is TinyUSB, and there is a machine module
with most of the standard classes implemented. Some examples are provided
in the examples/rp2/ directory.
Work done in collaboration with Graham Sanderson.
Signed-off-by: Damien George <damien@micropython.org>
