crtboot.s

ICCAVR中所有的库函数源码

; make sure to assemble w/ -n flag, e.g.
; iasavr -n crt...
;
; bootloader startup file, same as crtavr.s except that vectors are routed
; to the bootloader section and use jmp for the vector
;
	.include "area.s"

	.text
__start::			; entry point
	; route vector
	ldi R16,1
	out 0x35,R16	; MCUCR = 1, unlock IVSEL
	ldi R16,2
	out 0x35,R16	; MCUCR = 2, set ivsel

	USE_ELPM = 0;
	.include "init.s"

; call user main routine
	rcall _main
_exit::
	rjmp	_exit

; interrupt vectors. The first entry is the reset vector
;
	.area vector(abs)
	.org 0
	jmp __start