Glasgow Embedded / Glasgow - History

applet.control.si535x: migrate to V2 API, modernize, add test.

applet.sensor.scd30: migrate to V2 API and add test.

CI: cache PDM installation.

This is mainly important because numpy wheels have to be rebuilt from
scratch on PyPy, and that is the rate limiting step.

software: add API documentation to manual, where possible.

This commit also adjusts the documentation for better clarity,
consistency, and presentation, and includes some minor refactoring
for the same purpose.

applet.sensor.bmx280: migrate to V2 API and add tests.

applet.interface.i2c_controller: scan: display address as hex too.

applet.interface.i2c_controller: use clock divisor API.

The way this is done is rather hacky, done so to avoid modifying
the existing I2C initiator as much as possible (since it is reliable
and also verifying I2C gateware is very difficult).

At some later point the existing I2C gateware will be replaced with
a stream-based one anyway. Then all of this will go away.