mirror of
https://github.com/RevCurtisP/C02.git
synced 2024-11-22 16:34:15 +00:00
32 lines
1.5 KiB
Plaintext
32 lines
1.5 KiB
Plaintext
sticks - Atari 2600 Joystick Functions for C02
|
|
|
|
This library contains a function for reading the joysticks:
|
|
|
|
res = getstk(cntrlr); Reads the state of the specified joystick.
|
|
|
|
The joystick to be read is specified by
|
|
the argument cntrlr:
|
|
0 = Left Joystick
|
|
1 = Right Joystick
|
|
|
|
Returns a byte comprised of the bits:
|
|
Bit Hex Dec Control
|
|
0 $01 1 Up
|
|
1 $02 2 Down
|
|
2 $03 4 Left
|
|
3 $04 8 Right
|
|
7 $05 128 Trigger
|
|
|
|
A 1 in a bit means that the direction
|
|
or trigger is pressed, so the function
|
|
will return 0 if they joystick is
|
|
centered and the trigger is not pressed.
|
|
This is the reverse of the raw bits from
|
|
the hardware ports.
|
|
|
|
Note: The raw bits for the left joystick
|
|
are stored in TEMP0, while the raw bits
|
|
for the right joystick are stored in TEMP1.
|
|
|
|
|