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zero thing cleanup

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Lokathor 2018-12-24 12:08:11 -07:00
parent d0f43feae2
commit 65bee772a1
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8
book/src/04-non-video/01-buttons.md
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@ -29,9 +29,11 @@ The buttons are, going up in order from the 0th bit:
* R
* L
Bits above that are not used. However, since the arrow left and right can never
be pressed at the same time, and the arrows up and down can never be pressed at
the same time, this register will never read as zero.
Bits above that are not used. However, since the left and right directions, as
well as the up and down directions, can never be pressed at the same time, the
`KEYINPUT` register should never read as zero. Of course, the register _might_
read as zero if someone is using an emulator that allows for such inputs, so I
wouldn't go so far as to make it be `NonZeroU16` or anything like that.
When programming, we usually are thinking of what buttons we want to have _be
pressed_ instead of buttons we want to have _not be pressed_. This means that we