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The new names follow the OSHWA convention described at:
https://www.oshwa.org/a-resolution-to-redefine-spi-signal-names/
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The current hierarchy isn't particularly well suited to resources
like SDRAM or NOR flash, so make it much less fine-grained but easier
to use and less nitpicky.
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With the expectation that "display_9seg", "display_14seg" and
"display_16seg" will be forthcoming.
There are no provisions in this resource itself for multiplexing
the display. It is expected that on boards with multiplexed displays,
an additional resource "display_7seg_ctrl" will be provided, and it
would have either an n-bit signal "sel" (binary encoded) or an n-bit
signal "en" (one-hot encoded). (This may be revisited in the future.)
Fixes #17.
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Expose blinky as a stable component, to make writing out-of-tree
board files a bit nicer.
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These resources were renamed as:
* user_led → led
* user_btn → button
* user_sw → switch
Fixes #13.
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