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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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RTS/CTS and DTR/DSR pairs have been swapped to work around the signal
direction in UARTResource. Un-reverse the signals, making the names
match the schematic. Fix the direction by setting role=dce.
Ref. http://www.latticesemi.com/view_document?document_id=50373
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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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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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SB_LVCMOS33 is not recognized by vendor tools. Use SB_LVCMOS instead.
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Or the last and the first on line pin get glued together.
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