Add support for converting SVD data to `ifgen` config data

[vkottler]

Probably makes sense to implement this after https://github.com/vkottler/ifgen/issues/23.

With something like this, we could go from SVD directly to HAL layer.

[vkottler]

This is next up for the most part but we probably need to figure out how to start a new firmware project, to get up and running..

[vkottler]

Where we can get some sample data: https://github.com/vkottler/xmc/issues/7.

[vkottler]

This is getting implemented on: https://github.com/vkottler/ifgen/pull/28.

Resources:

• https://docs.python.org/3/library/xml.etree.elementtree.html#element-objects
• https://www.keil.com/pack/doc/CMSIS/SVD/html/elem_cpu.html
• https://www.keil.com/pack/doc/CMSIS/SVD/html/elem_device.html
• https://www.keil.com/pack/doc/CMSIS/SVD/html/index.html

Current tasks:

• move SVD's to package data and find a way to use like package://ifgen/ syntax to load, otherwise accept a file
• cpu/device are parsed, but we want to start parsing thing that we will generate structs and enums around
• we should generate some kind of "constants" / "device/cpu" header or something? based on all of the metadata

[vkottler]

Now that we're done with the SVD parsing + modeling, time to start building struct (and enum) definitions.

[vkottler]

We've pushed generation very far! So far we've discovered one instance of a register "cluster" that we need https://github.com/vkottler/ifgen/issues/31 for (do that next).

Once that's complete, we can resume getting data plugged into the generated configuration!

As we're refining that, we should add a unit test to generate sources based on the generated configs.

[vkottler]

Arrays are now supported.

[vkottler]

One technical challenge that seems to exist here is the need to check for padding bytes.

I suspect a lot of these struct definitions require them

[vkottler]

We might need to knock this out: https://github.com/vkottler/ifgen/issues/33.

That example shows how we might want to put some address info on some of these?

edit: adding the byte offset to the description would probably be helpful

[vkottler]

Probably need to knock out:

• https://github.com/vkottler/ifgen/issues/35
• https://github.com/vkottler/ifgen/issues/36

as well. We also still need to generate enums and do bit fields...

[vkottler]

Noting that in addition to padding we also need to fix unions/aliases:

[vkottler]

Another one to implement: https://github.com/vkottler/ifgen/issues/39.

[vkottler]

Just these two things left:

• https://github.com/vkottler/ifgen/issues/33 (unions)
• https://github.com/vkottler/ifgen/issues/42 (bit fields)

[vkottler]

This gets fully implemented on https://github.com/vkottler/ifgen/pull/43.