Get the button press! 2

This was very helpful for me, and it should be pinned or something, because it may can help other people as well. However, I have another question, how can I check if A, B and C are pressed at the same time? Or in other words, how can I check if there are multiple buttons pressed?


(Only 2 points because I don't think it's that hard.)

 

Well, I guess you check $FFFFF603 and add the values together to find what's being held down (in Sonic 1).

 

You are looking for something like:




cmp.b #$70,($FFFFF604).w ; check if A,B, and C are being held ($F605 for if it is being pressed, not held)


beq.s SomeLabel


-code if A,B, and C are not being pressed-


rts


SomeLabel:


code to do if they are being pressed-

 

^ Maybe I'm reading it wrong, but your way would work only if Start, Up, Down, Left, and Right were all untouched while A, B, and C were held. If this code is used for moving Sonic, you should probably allow a direction to be pressed at the same time. While you could move the button inputs to d0 or such and do arithmetic on that to weed out the other buttons and be able to use your comparison, it's probably just as quick to simply check each of the three bits for A, B, and C (bits 4, 5, and 6) individually, and branch out of the routine if any one of those checks fails.

 

To say it a bit clearlier, I'm making a kind of Jumpdash, which is only working when you are holding A B and C. After releasing any of these buttons it should be canceled.

 

Loop the check while the jumpdash is being proceeded.