ltc2449.s

LTC2449 AD转换 LTC2449 AD转换 LTC2449 AD转换

	.module LTC2449.c
	.area text(rom, con, rel)
	.dbfile E:\mysoft\DH980\LTC2449.c
	.dbfunc e LTC2449_init _LTC2449_init fV
	.even
_LTC2449_init::
	.dbline -1
	.dbline 9
; #define _LTC2449_C
; #include <iom169v.h>
; #include <macros.h>
; #include <stdio.h>
; #include "LTC2449.h"
; #include "main.h"
; 
; void LTC2449_init()
; {
	.dbline 10
; 	SET_CS;
	sbi 0xe,3
	.dbline 11
; 	CLR_SCK;
	in R24,0xe
	andi R24,239
	out 0xe,R24
	.dbline 12
; 	CLR_CS;	
	in R24,0xe
	andi R24,247
	out 0xe,R24
	.dbline -2
L1:
	.dbline 0 ; func end
	ret
	.dbend
	.dbfunc e LTC2449_RW _LTC2449_RW fl
;          setup -> R20,R21
;        AD_data -> R22,R23
;              l -> R10
;        chunnel -> R16,R17
	.even
_LTC2449_RW::
	xcall push_gset3
	.dbline -1
	.dbline 15
; }
; unsigned long LTC2449_RW(unsigned int chunnel)
; {
	.dbline 17
; 	unsigned char l;
; 	unsigned int AD_data=0;
	clr R22
	clr R23
	.dbline 18
; 	unsigned int setup=0xa050;
	ldi R20,41040
	ldi R21,160
	.dbline 19
; 	CLR_CS;
	in R24,0xe
	andi R24,247
	out 0xe,R24
	.dbline 20
; 	chunnel=chunnel<<8;chunnel&=0b0000011100000000;
	mov R17,R16
	clr R16
	.dbline 20
	andi R16,0
	andi R17,7
	.dbline 21
; 	setup|=chunnel;
	or R20,R16
	or R21,R17
L3:
	.dbline 23
	.dbline 23
	.dbline 23
L4:
	.dbline 22
; 	while(SDO!=0)
	sbic 0xc,5
	rjmp L3
	.dbline 24
; 	{;}
; 	for(l=0;l<32;l++)
	clr R10
	xjmp L9
L6:
	.dbline 25
; 	{
	.dbline 26
; 		if(l<13)
	mov R24,R10
	cpi R24,13
	brsh L10
	.dbline 27
; 			{
	.dbline 28
; 				if((setup&0x8000)!=0)
	sbrs R21,7
	rjmp L12
	.dbline 29
; 					SET_SDI;
	sbi 0xe,6
	xjmp L13
L12:
	.dbline 31
;     		else 
;     			CLR_SDI;
	in R24,0xe
	andi R24,191
	out 0xe,R24
L13:
	.dbline 32
;     		setup=setup<<1;
	lsl R20
	rol R21
	.dbline 33
; 			}
L10:
	.dbline 34
; 		SET_SCK;
	sbi 0xe,4
	.dbline 35
; 		if(l>2 && l<19)//取最高16位
	ldi R24,2
	cp R24,R10
	brsh L14
	mov R24,R10
	cpi R24,19
	brsh L14
	.dbline 36
; 			{
	.dbline 37
; 				AD_data=AD_data<<1;
	lsl R22
	rol R23
	.dbline 38
; 		if(SDO!=0)
	sbis 0xc,5
	rjmp L16
	.dbline 39
; 			AD_data|=0x0001;
	ori R22,1
	xjmp L17
L16:
	.dbline 41
; 		else 
; 			AD_data&=0xfffe;
	andi R22,254
L17:
	.dbline 42
; 			}
L14:
	.dbline 43
	in R24,0xe
	andi R24,239
	out 0xe,R24
	.dbline 44
L7:
	.dbline 24
	inc R10
L9:
	.dbline 24
	mov R24,R10
	cpi R24,32
	brlo L6
	.dbline 46
; 		CLR_SCK;
; 	}
; 	//SET_CS;
; 	return AD_data;
	movw R2,R22
	clr R4
	clr R5
	movw R16,R2
	movw R18,R4
	.dbline -2
L2:
	xcall pop_gset3
	.dbline 0 ; func end
	ret
	.dbsym r setup 20 i
	.dbsym r AD_data 22 i
	.dbsym r l 10 c
	.dbsym r chunnel 16 i
	.dbend