git.sur5r.net Git - cc65/blob - libsrc/serial/ser_unload.s

   1 ;
   2 ; Ullrich von Bassewitz, 2003-04-15
   3 ;
   4 ; unsigned char __fastcall__ ser_unload (void);
   5 ; /* Unload the currently loaded driver. */
   6
   7
   8         .import         ser_clear_ptr
   9
  10         .include        "ser-kernel.inc"
  11         .include        "ser-error.inc"
  12         .include        "modload.inc"
  13
  14
  15 _ser_unload:
  16         lda     _ser_drv
  17         ora     _ser_drv+1
  18         beq     no_driver               ; No driver
  19
  20         jsr     ser_uninstall           ; Deinstall the driver
  21
  22         lda     _ser_drv
  23         ldx     _ser_drv+1
  24         jsr     _mod_free               ; Free the driver
  25
  26         jmp     ser_clear_ptr           ; Clear the driver pointer, return zero
  27
  28 no_driver:
  29         tax                             ; X = 0
  30         lda     #SER_ERR_NO_DRIVER
  31         rts
  32