eeprom.s

用ATMEGA16的硬件SPI驱动AT45DB041D

	.module eeprom.c
	.area text(rom, con, rel)
	.dbfile E:\item\car\AT45DB041D\eeprom.c
	.dbfunc e eeprom_write_byte _eeprom_write_byte fV
;         ucData -> R18
;        address -> R16,R17
	.even
_eeprom_write_byte::
	.dbline -1
	.dbline 5
; #include <iom16v.h>
; #include <macros.h>
; 
; void eeprom_write_byte(unsigned int address,unsigned char ucData)
; {
L2:
	.dbline 8
; 	/* 等待上一次写操作结束 */
; 	while(EECR & (1<<EEWE))
; 	;
L3:
	.dbline 7
	sbic 0x1c,1
	rjmp L2
X0:
	.dbline 10
; 	/* 设置地址和数据寄存器 */
; 	EEAR = address;
	out 0x1f,R17
	out 0x1e,R16
	.dbline 11
; 	EEDR = ucData;
	out 0x1d,R18
	.dbline 13
; 	/* 置位EEMWE */
; 	EECR |= (1<<EEMWE);
	sbi 0x1c,2
	.dbline 15
; 	/* 置位EEWE以启动写操作 */
; 	EECR |= (1<<EEWE);
	sbi 0x1c,1
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbsym r ucData 18 c
	.dbsym r address 16 i
	.dbend
; }