Aim MIL-STD-1553 - Apicmdbcxferdescmod

MIL-STD-1553 Reference Manual
258
Chapter 7 – Bus Controller Functions
7.1.28 ApiCmdBCXferDescMod
Prototype:
AiInt16 ApiCmdBCXferDescMod( AiUInt32 ul_ModuleHandle, AiUInt8 biu,
AiUint16 xid, AiUInt32 mode, AiUInt32 value[4] );
Purpose:
This function can be used to modify several BC transfer descriptor values on the fly.
I
I
n
n
p
p
u
u
t
t
A
A
i
i
U
U
I
I
n
n
t
t
1
1
6
6
x
x
i
i
d
d
BC Transfer ID
A
A
i
i
U
U
I
I
n
n
t
t
3
3
2
2
m
m
o
o
d
d
e
e
Define
Description
XFER_DESC_FIELD_CHN
Modify channel
XFER_DESC_FIELD_CW1
Modify command word 1
XFER_DESC_FIELD_CW2
Modify command word 2
XFER_DESC_FIELD_TRTYPE
Modify transfer type
XFER_DESC_FIELD_CW1_CW2
Modify command word 1 and 2
A
A
i
i
U
U
I
I
n
n
t
t
3
3
2
2
v
v
a
a
l
l
u
u
e
e
[
[
4
4
]
]
Define
Index
Value
XFER_DESC_FIELD_CHN
0
Channel 0=pri; 1=sec
XFER_DESC_FIELD_CW1
0
Command word 1
XFER_DESC_FIELD_CW2
0
Command word 2
XFER_DESC_FIELD_TRTYPE
0
0=BC2RT; 1=RT2BC; 2=RT2RT; 3=NOP
1
Command word 1
2
Command word 2
XFER_DESC_FIELD_CW1_CW2
0
Command word 1
1
Command word 2
O
O
u
u
t
t
p
p
u
u
t
t
N
N
o
o
n
n
e
e
Return Value
A
A
i
i
I
I
n
n
t
t
1
1
6
6
All API functions return API_OK if no error occurred. If the return value is not equal
to API_OK the function ApiGetErrorDescription can be used to obtain an error
description.