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inverters.
Note: this change does NOT affect pin functionality or naming, and
does not require modifying your design. It does however affect some
board files, where keywords corresponding to active low pins will have
to be adjusted:
SPIResource(0, cs="C1", ...) → SPIResource(0, cs_n="C1", ...)
The new naming scheme will make it easier to write and audit board
files by clearly marking inverted pins in resource factories, similarly to
how `PinsN` indicates the same in bare resources.
Fixes #129.
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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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