IBM AT 5170 Technical Reference page 312

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IBM Personal Computer MACRO Assembler Ver&ion 2.00 I-I
RS232 ----
06/10/85
COMMUNICATIONS 8105 IRS2321 06-10-85
I PAGE 116,121
2
1ITLE RS232 ---- 06/10/85 COMMUNICATIONS 8105 (RS2321
3 .LIST
4 0000
CODE SEGMENT 8YTE PU8L I C
5
.
PU8LIC RS232 10 1
7 EXTRN AI ;NEAR ­
6
EXTRN DDS :NEAR
9
I.
, INT 14 H ---------------------------------------------------------------- ­
II
:RS232 10
12
: - TH[S ROUTINE PROVIDES BYTE STREAM 110 TO THE COMMUNICATIONS
13
: PORT ACCORDING TO THE PARAMETERS:
14
15 : (AHI= OOH INITIALIZE THE COMMUNICATIONS PORT
I.
(AU HAS PARAMETERS FOR [NIT[ALIZATION
17 ;
16 7 • 5
4 2 I •
19
----- 8AUD RATE -- -PAR 1TY- STOP81 T --WORD LENGTH-­
2.
21
000 - 1 10 XO - NONE - I 10 - 1 BI TS
22
001 - 150
o
I
ODD 2 11 - 8 BITS
23
010 - 300 I I - EVEN
2.
o
I I - 600
25
100 - 1200
2.
101 - 2400
27
1 10 - 4600
26
1 1 1 - 9600
29
ON RETURN. CONDITIONS SET AS
IN
CALL TO COMMO STATUS (AH=03HI
3.
31
IAHI= 01H SEND THE CHARACTER IN (ALlOVER THE COMMO LINE
32
(AL) REGISTER IS PRESERVED
33
ON EX[T, BIT 1 OF AH IS SET IF THE ROUTINE WAS UNABLE TO
3.
TO TRANSMIT THE BYTE OF DATA OVER THE LINE.
35
IF B[T 1 OF AH IS NOT SET, THE
3.
REMAINDER OF (AH) IS SET AS IN A STATUS REQUEST.
37
REFLECTING THE CURRENT STATUS OF THE LINE.
36
IAH) = 02H RECEIVE A CHARACTER IN (ALI FROM COMMO LINE 8EFORE
39
RETURN I NG TO CALLER
ON EXIT, (AHI HAS THE CURRENT LINE STATUS. AS SET 8Y THE
"
THE STATUS ROUTINE, EXCEPT THAT THE ONLY 81TS
42
LEFT ON ARE THE ERROR BITS
11,4,3,2,1)
.3
IF (AHI HAS 81T 7 ON (T,IME DUn THE REMAINING
81TS ARE NOT PREDICTABLE.
'5 THUS, (AH) IS NON ZERO ONLY WHEN AN ERROR OCCURRED.
IAHI= 03H RETURN THE COMMO PORT STATUS IN (AX)
47
(AH) CONTAINS THE LINE CONTROL STATUS
'6
81T
7
=
TIME OUT
.9
81T 6
=
TRANSMIT SHIFT REGISTER EMPTY
'4
5.
BIT 5
=
TRANSMIT HOLDING REGISTER EMPTY
51
BIT 4
=
BREAK DET~CT
52
81T 3
=
FRAMING ERROR
53
81T 2
=
PARITY ERROR
54
81
T 1
=
OVERRUN ERROR
55
BIT 0
=
DATA READY
5.
(ALI CONTAINS THE MODEM STATUS
57
8IT 7
=
RECEIVE LINE SIGNAL DETECT
56
BIT 6
=
RING INDICATOR
59
BIT 5
=
DATA SET READY
81T 4
=
CLEAR TO SEND
81T 3
=
DELTA RECEIVE LINE SIGNAL DETECT
.2
81T 2
=
TRAILING EDGE RING DETECTOR
.3
81T 1
=
DELTA DATA SET READY
8IT 0
=
DELTA CLEAR TO SEND
.,
• •
.5
!OX)
=
PARAMETER INDICATING WHICH RS232 CARD (0,1 ALLOWED)
.7
66
DATA AREA _RS232 BASE CONTAINS THE BASE ADDRESS OF THE 6250 ON THE CARD
: LOCATION 40QH CONTAINS UP TO 4 R5232 ADDRESSES POSSIBLE
J DATA AREA LABEL ttRS232 TIM OUT 1BYTE) CONTAINS OUTER LOOP COUNT
71
J
VALUE FOR TIMEOUT 1DEFAULT; 1 )
72
; OUTPUT
73
I
AX MOD I F I ED ACCORD I NG TO PARAMETERS OF CALL
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7.
7.
; ALL OTHERS UNCHANGED
75
1------------------------ ------------ ­
7.
ASSUME CS:CODE,DS:DATA
77
18 0000
PROC
FAR
79
6.
;----- VECTOR TO APPROPRIATE ROUTiNE
61
82 0000 F8
STI
I NTERRUPTS BACK ON
63 0001 IE PUSH
OS SAVE SEGMENT
84 0002 52
PUSH OX
85 0003 56
PUSH S!
86 0004 51 PUSH
01
81 0005 51
PUSH CX
88 0006 53
PUSH BX
69 0001 88 F2
MOV
SI,DX RS232 VALUE TO (5 I)
90 0009 88 FA
MOV DI,DX AND TO (011 IFOR TIMEOUTSI
91 0008 01 E6 SHL
51.1 WORD OFFSET
92 0000 E8 0000 E CALL
005
g~:~~S232_BASE[SI
]
93 0010 68 94 0000 R
MOV
GET 8ASE ADDRESS
94 0014 OB 02 OR
TEST FOR 0 BASE ADDRESS
95 0016 14 13 JZ
A3 RETURN
96 00180,1. E4
OR
AH.AH TES T FOR (AH)
=
OOH
91 001,1. 14 16
JZ A4 COMMO INITIALIZATiON
96 001C FE CC
OEC AH TEST FOR {AHI= OIH
99 OOlE 14 48
JZ A5 SEND (ALI
100 0020 FE CC
OEC AH TEST FOR (AH) = 02H
101 0022 14 10
JZ AI2 RECEIVE INTO {ALI
102 0024
,1.2:
103 0024 FE CC
OEC
AH TEST FOR (AH) '" 03H
104 0026 15 03
JNZ A3
105 0028 E9 0086 R
JMP Al6
COMMUNICATION STATUS
106 0028
,1.3:
RETURN FROM RS232
101 0028 58 POP
BX
108 002C 59
POP
CX
109 0020 5F
POP
01
110 002E 5E
POP 5 I
111 002F 5,1.
POP
OX
112 0030 IF
POP
OS
113 0031
IRET
1 RETURN TO CALLER. NO ACT I ON
CF
5-140 RS232