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Paddle Reading
ReadPaddle:
-: in a,($dc) ; Wait for TR input to be 0
bit 5,a
jr nz,-
and $0f ; Save RLDU bits in e
ld e,a
-: in a,($dc) ; Wait for TR input to be 1
bit 5,a
jr z,-
rrca ; Get low 4 bits into 4 high bits
rrca
rrca
rrca
and $f0
or e ; Merge with e
ret ; result in a (position 0..255)
-: in a,($dc) ; Wait for TR input to be 0
bit 5,a
jr nz,-
and $0f ; Save RLDU bits in e
ld e,a
-: in a,($dc) ; Wait for TR input to be 1
bit 5,a
jr z,-
rrca ; Get low 4 bits into 4 high bits
rrca
rrca
rrca
and $f0
or e ; Merge with e
ret ; result in a (position 0..255)
Some games use a "weighted history" to smooth out any noise or abrupt changes; this is achieved by adding the latest "raw" position to the last smoothed position and dividing by two. This will however introduce a small control lag.
