smsst5@unix.cis.pittsburgh.edu (Steve M Suhy) (06/09/89)
Does anyone know of any cucug, amicus, or fish disks that contain any games or routines that contain C source for reading Port 2 of a joystick? Thanks for any response. -Steve
s110018@pollux.ucdavis.edu (0000;0000001007;4000;250;216;s110) (06/13/89)
In article <18380@unix.cis.pittsburgh.edu> smsst5@unix.cis.pittsburgh.edu (Steve M Suhy) writes: > > Does anyone know of any cucug, amicus, or fish disks that contain >any games or routines that contain C source for reading Port 2 of >a joystick? Thanks for any response. > >-Steve Here's a nice short way to do it. (Just a tad bit shorter than the example by Rob Peck in the RKM.) #include <exec/types.h> #define DMA_REGS 0xdff000 #define JOY1DAT 0x00C+DMA_REGS void CheckJoystick() { USHORT *joyPort2,joyData; short dirX,dirY,a,b,c,d; joyPort2=JOY1DAT; joyData=*joyPort2; dirX=dirY=0; a= ((joyData & 0x0002) >> 1); b= ((joyData & 0x0200) >> 9); c= ((joyData & 0x0001) ); d= ((joyData & 0x0100) >> 8); c^=a; d^=b; if (a) dirX= 1; if (b) dirX=-1; if (c) dirY= 1; if (d) dirY=-1; /* Just check for dirX or dirY here */ } -Bruce Rogers -u586182058ea@deneb.ucdavis.edu _______________________________________________________________________________ Just a man whose circumstances went beyond his control....