ch10_handbook:data_file_interpretation
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| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision | ||
| ch10_handbook:data_file_interpretation [2014/04/13 17:10] – bob | ch10_handbook:data_file_interpretation [2014/04/13 18:41] – bob | ||
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| | DATA CHECKSUM | **Packet Trailer** | | | DATA CHECKSUM | **Packet Trailer** | | ||
| - | **Data Packet Organization** | + | < |
| Data packets must contain data. They are not allowed to only contain filler. Filler can be | Data packets must contain data. They are not allowed to only contain filler. Filler can be | ||
| Line 141: | Line 141: | ||
| struct SuI106Ch10Header | struct SuI106Ch10Header | ||
| { | { | ||
| - | uint16_t uSync; | + | uint16_t |
| - | uint16_t uChID; | + | uint16_t |
| - | uint32_t ulPacketLen; | + | uint32_t |
| - | uint32_t ulDataLen; | + | uint32_t |
| - | uint8_t ubyDataVer; | + | uint8_t |
| - | uint8_t ubySeqNum; | + | uint8_t |
| - | uint8_t ubyPacketFlags; | + | uint8_t |
| - | uint8_t ubyDataType; | + | uint8_t |
| - | uint8_t aubyRelTime[6]; | + | uint8_t |
| - | uint16_t uChecksum; | + | uint16_t |
| }; | }; | ||
| </ | </ | ||
| - | **Packet header structure.** | + | |
| + | < | ||
| The Channel ID field uniquely identifies the source of the data. The value of the | The Channel ID field uniquely identifies the source of the data. The value of the | ||
| Line 213: | Line 214: | ||
| }; | }; | ||
| </ | </ | ||
| - | **Optional secondary header structure with IRIG 106 Ch 4 time representation.** | + | < |
| - | < | + | < |
| struct SuI106Ch10SecHeader_1588Time | struct SuI106Ch10SecHeader_1588Time | ||
| { | { | ||
| Line 224: | Line 225: | ||
| }; | }; | ||
| </ | </ | ||
| - | **Optional secondary header structure with IEEE 1588 time representation.** | + | < |
| ==== Data Payload ==== | ==== Data Payload ==== | ||
| Line 253: | Line 254: | ||
| }; | }; | ||
| </ | </ | ||
| - | **Intra-packet Time Stamp, 48-bit RTC.** | + | < |
| < | < | ||
| Line 264: | Line 265: | ||
| }; | }; | ||
| </ | </ | ||
| - | **Intra-packet Time Stamp, IRIG 106 Ch 4 binary** | + | < |
| < | < | ||
| Line 273: | Line 274: | ||
| }; | }; | ||
| </ | </ | ||
| - | **Intra-packet Time Stamp, IEEE 1588** | + | < |
| ==== Data Formats ==== | ==== Data Formats ==== | ||
| Line 349: | Line 350: | ||
| algorithm for reading all root and node index packets is as follows: | algorithm for reading all root and node index packets is as follows: | ||
| - | 1. If " | + | 1. If " |
| 2. Move read pointer to last packet of data file. Store file offset of this packet. | 2. Move read pointer to last packet of data file. Store file offset of this packet. | ||
| + | |||
| 3. If last packet data type does not equal 0x03 (Computer Generated Data, Format 3) | 3. If last packet data type does not equal 0x03 (Computer Generated Data, Format 3) | ||
| - | then index does not exist. | + | then index does not exist. |
| 4. Get the index count from the CSDW. | 4. Get the index count from the CSDW. | ||
| + | |||
| 5. For each root index contained in the packet, | 5. For each root index contained in the packet, | ||
| * Read the Node Index offset value | * Read the Node Index offset value | ||
| Line 360: | Line 365: | ||
| * Get the node index count from the CSDW | * Get the node index count from the CSDW | ||
| * For each node index contained in the packet read and store the time stamp, channel ID, data type, and data packet offset values. | * For each node index contained in the packet read and store the time stamp, channel ID, data type, and data packet offset values. | ||
| + | |||
| 6. Read last root node index. If offset value is equal to current root node packet offset | 6. Read last root node index. If offset value is equal to current root node packet offset | ||
| (stored in Step 2) then done. | (stored in Step 2) then done. | ||
| + | |||
| 7. Else the move read pointer to the next Root Index packet offset value | 7. Else the move read pointer to the next Root Index packet offset value | ||
| + | |||
| 8. Read the next Root Index packet. | 8. Read the next Root Index packet. | ||
| + | |||
| 9. Go to Step 4. | 9. Go to Step 4. | ||
| Line 426: | Line 435: | ||
| }; | }; | ||
| </ | </ | ||
| - | **UDP Transfer Header, non-segmented data.** | + | < |
| < | < | ||
| Line 440: | Line 449: | ||
| }; | }; | ||
| </ | </ | ||
| - | **UDP Transfer Header, segmented data.** | + | < |
| Computer Generated Data, Format 3 (Recording Index) packets are meaningless in a | Computer Generated Data, Format 3 (Recording Index) packets are meaningless in a | ||
| Line 446: | Line 455: | ||
| will have contiguous sequence numbers for error detection. They should be ignored, though, | will have contiguous sequence numbers for error detection. They should be ignored, though, | ||
| when received. | when received. | ||
| - | |||
ch10_handbook/data_file_interpretation.txt · Last modified: 2014/07/16 15:18 by bob