Atmel Start Framework builder

[frankleonrose]

As discussed in #33, here's my proposed Atmel Start builder.

Current issues (can be seen building examples/atmelstart-blink):

• [Solved] PlatformIO issues a warning about the use of atstart_file option. Is there a way to silence that warning?

Warning! Ignore unknown configuration option atstart_file in section [env:AdafruitFeatherM0]

• The packages downloaded are placed in ".pio/.downloads". Is there a better place to put the downloads folder? BUILD_CACHE_DIR? I'm thinking the downloads do NOT need to be removed on "clean", in which case maybe not the build cache. Is there a precedent for how to handle downloaded build artifacts?

• The generated file peripheral_clk_config.h sets all clock frequencies to 0. This necessitates including build_flags as shown below. I plan to inject #pragma warning statements into the peripheral_clk_config.h so that users of the framework are warned when they have not successfully overridden frequency values.

build_flags =
  -D CONF_CPU_FREQUENCY=47972352
  -D CONF_GCLK_SERCOM0_CORE_FREQUENCY=47972352
  -D CONF_GCLK_SERCOM0_SLOW_FREQUENCY=32768

[ivankravets]

PlatformIO issues a warning about the use of atstart_file option

If you need custom options in platformio.ini for your framework, please use board_build.%frameworkname%.atstart_file. Later in build script, board.get("build.xxxx.atstart_file")

[ivankravets]

Atmel Start - is this a framework or configuration tool?

[frankleonrose]

Atmel Start is a configuration tool that generates code that uses Atmel's Advanced Software Framework - ASF4. However, the two are tightly coupled. I think of it as Atmel Start generating a custom framework per project.

In order to break out ASF4 as an independent framework layer, it would have to include all possible hal/hpl/driver sources. Then the builder would have to select among them as appropriate for a particular board. This would essentially be replicating the work Atmel Start does when it generates the source package.

[ivankravets]

How about to name it just framework = atmel-asf?

[frankleonrose]

Given the high degree of coupling, I don't see a problem with atmel-asf. From my perspective, the entrypoint is Atmel Start, which is why I used that name. But anybody in the ecosystem will understand.

[Mivr]

Hi @frankleonrose, I do not know if there is still interest in this framework, however for the issue of zero clocks in the peripheral_clk_config.h there is a fix: Mivr/atmel-start@5e3b177 as it seems the external frequency should not be set (I will clean it a bit to remove the value before serialization, I have tested the change and it only affects the peripheral_clk_config in my test projects).
Also, there is a Go tool that has more functionality and might be a good idea to integrate into this PR?