ds18b20.asm

来自「Microchip tempratere sonsore source asm 」· 汇编 代码 · 共 64 行

; XTAL : 16 MHz
; PIC16F877
; DS18B20
;---------------------------------------
	LIST 	P = 16F877, R = HEX
	INCLUDE	"P16F877.INC"
	ERRORLEVEL	.1
;---------------------------------------
	ORG		0X00
	GOTO	START		
;	ORG		0X04
;	GOTO	ISR
;	goto	KKK
;---------------------------------------
	#DEFINE	DSPIN	PORTB, 0
	#DEFINE	TXPIN	PORTB, 1
	#DEFINE RXPIN	PORTB, 2		
;---------------------------------------
DELAY1	EQU	0X20
TEMP1	EQU	0X21
TEMP2	EQU	0X29
KOMUT	EQU	0X22
DELAY2	EQU	0X23
DELAY3	EQU	0X24
SAYAC	EQU	0X25
BTX		EQU	0X26
BRX		EQU	0X27
SAYAC1	EQU	0X28
SAYAC2	EQU	0X30
BUFFER	EQU	0X29
;---------------------------------------
; KATSAYI = (((1/istenilen Baundrate)/(KCS)-5)/4)
; KCS --> 4X(1/XTAL)
;  9600 baundrate 4   Mhz KATSAYI --> KATSAYI = 25   
;  9600 baundrate 8   Mhz KATSAYI --> KATSAYI = 50
;  9600 baundrate 16  Mhz KATSAYI --> KATSAYI = 103   
; (4XKATSAYI + 5
		;-------------------------------
DELAYSU MACRO	KATSAYI		; DELAYSU macrosu
	MOVLW	KATSAYI			; W = KATSAYI
	CALL	DELAY_2			; DELAY_2 ui 鏰瘕r
	ENDM					; Macroyu sonland齬.
;---------------------------------------
DELAY_2: 					; 2 祍
	MOVWF	DELAY3			; 1 礢	
	NOP						; DELAY3
	DECFSZ	DELAY3			; DELAY3 + 1 祍
	GOTO	$ - 2			; 2XDELAY3
	RETURN					; 2 祍	
;---------------------------------------
TXLOAD	MACRO
	BSF		STATUS, 5
	BCF		TRISB,	1
	BCF		STATUS, 5
	ENDM
;---------------------------------------
RXLOAD	MACRO
	BSF		STATUS, 5
	BSF		TRISB, 	2
	BCF		STATUS,	5
	CLRF	BRX
	ENDM
;---------------------------------------
TX:							; G鰊derim altyordam