11.1.6.2. Circular Buffer Off – Multi Session
• For multi session example, the session starts at point A and C, and ends at point
B and D.
• While downloading, the smart phone receives, 1st Block (oldest data) first and
500th Block (newest data) at the end. The receiving block order should be (1 to
500).
• Since circular buffer is off, the log will end at Point D, and “End of Memory”
indication will be shown at Point D.
11.1.6.3. Circular Buffer ON – Single Session – Memory Not Overlapped
• The session starts at point A (341st block), and ends at point B (100th block).
• While downloading, the smart phone receives, 101st Block (oldest data) first
and 100th Block (newest data) at the end. The receiving block order should be
(101 to 500 and 1 to 100).
• The blocks 101 to 340 contain old data.
• Since circular buffer is on, the log will not end at 500th block.
11.1.6.4. Circular Buffer ON – Single Session – Memory Overlapped
Figure 11-3: Circular Buffer Off – Multi Session
100 101 ….
1
….
….
….
2
499 500
START
A
END
B
100 101
….
1
….
….
….
2
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
100 101
….
1
….
….
….
2
499 500
…. …. 340 341
START
A
END
B
100 101
….
1
….
….
….
2
499 500
…. …. 141 142
START
A
END
B
100 101
….
50
….
….
….
51
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
1
….
….
2
100 101
….
1
….
….
….
2
340 341
…. …. 200 201
START
1
A
END
2
D
…. …. 499 500
END
1
B
START
2
C
Figure 11-4: Circular Buffer ON – Single Session – Memory Not Overlapped
100 101 ….
1
….
….
….
2
499 500
START
A
END
B
100 101
….
1
….
….
….
2
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
100 101
….
1
….
….
….
2
499 500
…. …. 340 341
START
A
END
B
100 101
….
1
….
….
….
2
499 500
…. …. 141 142
START
A
END
B
100 101
….
50
….
….
….
51
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
1
….
….
2
100 101
….
1
….
….
….
2
340 341
…. …. 200 201
START
1
A
END
2
D
…. …. 499 500
END
1
B
START
2
C
Figure 11-5: Circular Buffer ON – Single Session – Memory Overlapped
100 101 ….
1
….
….
….
2
499 500
START
A
END
B
100 101
….
1
….
….
….
2
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
100 101
….
1
….
….
….
2
499 500
…. …. 340 341
START
A
END
B
100 101
….
1
….
….
….
2
499 500
…. …. 141 142
START
A
END
B
100 101
….
50
….
….
….
51
499 500
START
1
A
END
1
B
…. …. 340 341
START
2
C
END
2
D
1
….
….
2
100 101
….
1
….
….
….
2
340 341
…. …. 200 201
START
1
A
END
2
D
…. …. 499 500
END
1
B
START
2
C
11-8
Data Logging
11