Aim MIL-STD-1553 - Using Scope Functionality on APE Cards

MIL-STD-1553 Reference Manual
390
Chapter 9 – Bus Monitor Functions
Bit 31
Bit 30
Bit 29
Bit 28
Bit 27
Bit 26
Bit 25
Bit 24
SAMPLE1
Bit 23
Bit 22
Bit 21
Bit 20
Bit 19
Bit 18
Bit 17
Bit 16
SAMPLE1
SAMPLE2
Bit 15
Bit 14
Bit 13
Bit 12
Bit 11
Bit 10
Bit 9
Bit 8
SAMPLE2
SAMPLE3
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SAMPLE3
CHN
TRG
S
S
a
a
m
m
p
p
l
l
i
i
n
n
g
g
d
d
a
a
t
t
a
a
r
r
a
a
n
n
g
g
e
e
Value
Description
0..511
Negative data values
512
Logical “0”
513..1023
Positive data values
S
S
A
A
M
M
P
P
L
L
E
E
1
1
First sample data of the data long word
S
S
A
A
M
M
P
P
L
L
E
E
1
1
Second sample data of the data long word
S
S
A
A
M
M
P
P
L
L
E
E
1
1
Third sample data of the data long word
C
C
H
H
N
N
Channel on which the sample data was stored
Value
Description
0
Channel A
1
Channel B
T
T
R
R
G
G
Trigger Info
Value
Description
0
A trigger event occurred on the
sample values of this 32bit data word
1
No trigger event detected
9.1.33.2 Using Scope Functionality On APE Cards
With APE cards, the API functions ApiCreateScopeBuffer and ApiCreateScopeBufferList
must be used to create memory buffers which will receive the recorded scope data.
The API function ApiProvideScopeBuffers marks a number of these buffers ready for data
reception from Hardware.
Attached to each of these buffers is a user definable handler function, which is called once
the corresponding buffer is filled with scope data.
Scope samples in the buffer are grouped to 3 samples per 32Bit data value, further on called
sample package.
Packages in one buffer are consecutively numbered with IDs from 0 to n.
Equally, all samples in one buffer are consecutively numbered with IDs from 0 to n.
This is the sample layout in one of these sample packages, where samples are sorted
chronologically from ID 0 to 2: