A89: Re: Difficulty inserting assembly into C code

[Prev][Next][Index][Thread]

A89: Re: Difficulty inserting assembly into C code


is there a way someone can help me out?  l know l'm sending a lot of messages 
to the list and l don't want to ask too much.  l also know that it's not cool 
to give someone a huge chunk of code and ask them to fix it...but l need a 
little help.  l've found that there isn't any getkey() function in any 
libraries, which would just return 0 if no key is pressed (and not "idle").  
what l'm trying to do is take the idle_loop() code out of userlib.asm and 
strip all the pausing and apd stuff, so that it just checks for a key press 
and returns a value (regardless of if a key was pressed or not).  In the 
first asm("  ") construct is the whole code, as it was.  ln the second is my 
code, after l've taken out what l think needs to be taken out (more or less). 
 l guess maybe if someone can tell me if the bottom code will work?  Sorry 
for the length of this mail, thanks though!



get_key()
{
asm("
    movem.l a0-a6/d1-d7,-(a7)
\idle_start
    move.l  APD_INIT,APD_TIMER   ; reset APD timer
    clr.w   APD_FLAG        ; reset APD flag
\wait_idle
    tst.w   APD_FLAG        ; time for APD?
    beq \no_apd         ; no -- do not shut down
\do_apd
    trap    #4
    bra \idle_start
\no_apd
    tst.w   (doorsos::kb_vars+$1C)     ; has a key been pressed?
    beq \wait_idle
    move.l  APD_INIT,APD_TIMER   ; reset APD timer (1)
    move.w  (doorsos::MaxHandles+$1E),d0
    clr.w   (doorsos::kb_vars+$1C)     ; clear key buffer
\try_key_off
    cmp.w   #KEY_DIAMOND+$10B,d0        ;press of diamond+On
    beq \do_apd         ;->off
\not_key_off
    movem.l (a7)+,a0-a6/d1-d7
    rts
     ");
};


HERE'S MY NEW CODE?

get_key()
{
asm("
    movem.l %a0-%a6/%d1-%d7,-(%a7)
    tst.w   (doorsos::kb_vars+$1C)     ; has a key been pressed?
    move.w  (doorsos::MaxHandles+$1E),d0
    clr.w   (doorsos::kb_vars+$1C)     ; clear key buffer
    movem.l (%a7)+,%a0-%a6/%d1-%d7
     ");
};
Follow-Ups: