HAL: add PIO configuration API #18
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Sourced from [0]; /vendor/asamx7x-hal. [0] jamesmunns/same70-experiments@58a3c34
More features will be added in future commits that require explicit configuration. Moved to build.rs to remove noise from HAL implementation.
device-selected is a meta-feature that is not described in §2.
This change supports the theoretical case of non-constant VDDIO (for E70/S70). An enum is also a much stronger association, rather than an environmental variable (feature).
That is, so the crate does not build if only device-selected is enabled.
memory.x tail courtesy of [0]. [0] atsamd-rs/atsamd@d7e054f
From my interpretation there there is only one single internal oscillator (not counting the slow clocks) which can be overridden by a single external oscillator, only that there are two switches that must be flipped to use the external.
"pmc" is shorter than "periph", and make it clear what peripheral that is being configured, if we in the future must configure more of them.
Changes made in 465f7d7 incorrectly assumed that there was only one way to configure the main crystal oscillator.
The datasheet documents two methods of selecting a clock for HCLK/MCK: one for PLLs and one for the slow and main clock.
We will be utilizing this information later down the line, for example when configuring peripheral baud rates.
UPLLCKDIV is derived from UPLLCK by either /1 or /2. Only the divider is forwarded to HCLK and PCK, as per §31.3.
Some clocks will emit MHz (UPLLCK, MAINCK) while others will emit Hz (PLLA - depending on dev/mult, and SLCK).
This will later be moved into a proper examples/*.rs when a GPIO API is available.
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Branch is now deprecated. Closing. Refer to #24. |
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This PR starts the work on a PIO configuration API, heavily inspired by the API available in the
atsamdcrate.This PR depends on #16.