spi.s

AVR单片机的电机测速程序

	.module spi.c
	.area text(rom, con, rel)
	.dbfile C:\DOCUME~1\www\桌面\motor_ce\spi.c
	.dbfunc e Spi_Init _Spi_Init fV
	.even
_Spi_Init::
	.dbline -1
	.dbline 4
; #include "includes.h"
; 
; void Spi_Init(void)
; {
	.dbline 5
;  SPCR = (1<<SPE)|(1<<MSTR)|(1<<SPR0);; //setup SPI
	ldi R24,81
	out 0xd,R24
	.dbline 5
	.dbline 6
;  SPSR = 0x00; //setup SPI
	clr R2
	out 0xe,R2
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e Spi_Byte_Tx _Spi_Byte_Tx fV
;          cdata -> R16
	.even
_Spi_Byte_Tx::
	.dbline -1
	.dbline 9
; }
; void Spi_Byte_Tx(unsigned char cdata)
; {
	.dbline 10
; SPDR=cdata;
	out 0xf,R16
L3:
	.dbline 12
	.dbline 12
L4:
	.dbline 11
; while(!(SPSR&(1<<SPIF)))
	sbis 0xe,7
	rjmp L3
	.dbline -2
L2:
	.dbline 0 ; func end
	ret
	.dbsym r cdata 16 c
	.dbend
	.dbfunc e Spi_Port_Init _Spi_Port_Init fV
	.even
_Spi_Port_Init::
	.dbline -1
	.dbline 15
; {}
; }
; void Spi_Port_Init(void)
; {
	.dbline 16
; DDRB  = 0xFF;
	ldi R24,255
	out 0x17,R24
	.dbline 17
; PORTB = 0xff;//PB4=1,AVR为主机，且MOSI输出
	out 0x18,R24
	.dbline -2
L6:
	.dbline 0 ; func end
	ret
	.dbend