flash.asm

e1c0df5d-c8bc-48a5-bc02-a2b7c51c0dbf是做mp3的源代码

#define __ASSEMBLER__ 1
#define __SFR_OFFSET 0
#include <avr/io.h>


.section	.bootloader


;*******************************************************************************
;*
;* flash writing assembly stuff
;*
;*******************************************************************************


; void writepage(unsigned int page_address, unsigned char func)

.global write_page
write_page:
;	push r30
;	push r31
;	push r0
;	push r1
	rcall	wait_spmen
	mov r31, r25
	mov r30, r24
	out SPMCR, r22
	spm
	rjmp wait_spmen

; void fill_temp_buffer(unsigned int page_address, unsigned int buffer_address)

.global fill_temp_buffer
fill_temp_buffer:
;	push r30
;	push r31
;	push r0
;	push r1
	rcall wait_spmen
	mov r31, r25
	mov r30, r24
	mov r1, r23
	mov r0, r22

	ldi r20, (1<<SPMEN)
	out SPMCR, r20
	spm
	rjmp wait_spmen

; void wait_spmen

wait_spmen:
	in r20, SPMCR
	sbrc r20, SPMEN
	rjmp wait_spmen
;	pop r1
;	pop r0
;	pop r31
;	pop r30
	ret