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cc65/libsrc/serial/ser_unload.s
cuz a07cc4a4c1 Working on new serial API
git-svn-id: svn://svn.cc65.org/cc65/trunk@2069 b7a2c559-68d2-44c3-8de9-860c34a00d81
2003-04-18 16:29:51 +00:00

33 lines
674 B
ArmAsm

;
; Ullrich von Bassewitz, 2003-04-15
;
; unsigned char __fastcall__ ser_unload (void);
; /* Unload the currently loaded driver. */
.import ser_clear_ptr
.include "ser-kernel.inc"
.include "ser-error.inc"
.include "modload.inc"
_ser_unload:
lda _ser_drv
ora _ser_drv+1
beq no_driver ; No driver
jsr ser_uninstall ; Deinstall the driver
lda _ser_drv
ldx _ser_drv+1
jsr _mod_free ; Free the driver
jmp ser_clear_ptr ; Clear the driver pointer, return zero
no_driver:
tax ; X = 0
lda #SER_ERR_NO_DRIVER
rts