randw.asm

来自「博世加速度传感器程序,代码进行了参数设置」· 汇编 代码 · 共 260 行

	NAME	RandW
PUBLIC	_READBYTE
PUBLIC	_WRITEBYTE

CSB	BIT	P3.5
SCK	BIT	P3.4
SDO	BIT	P3.3
SDI	BIT	P3.2
RandW	segment	code
	RSEG	RandW
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;read a byte from SPI
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
_READBYTE:
	MOV	A,R7
	CLR	CSB
	RLC	A
	MOV	SDI,C				;1
	CLR	SCK
	NOP
	NOP
	NOP	
	SETB	SCK
	RLC	A
	MOV	SDI,C				;2
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;3
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;4
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;5
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;6
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;7
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;8
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	NOP
	NOP
	NOP	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;1
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;2
	RLC	A
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;3
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;4
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;5
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;6
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;7
	RLC	A	
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	C,SDO				;8
	RLC	A	
	SETB	SDI
	SETB	CSB
	MOV	R7,A
	RET

_WRITEBYTE:
	MOV	A,R7
	CLR	CSB
	RLC	A
	MOV	SDI,C				;1
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;2
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;3
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;4
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;5
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;6
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;7
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;8
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	MOV	A,R5	
	RLC	A
	MOV	SDI,C				;1
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;2
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;3
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;4
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;5
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;6
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;7
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK
	RLC	A
	MOV	SDI,C				;8
	CLR	SCK
	NOP
	NOP
	NOP
	SETB	SCK	
	SETB	SDI
	SETB	CSB
	RET

	END