4ba7b49cdd
0x97 allows for detection of all 1-3 bit errors in a message of up to 119 bytes (see https://www.faa.gov/aircraft/air_cert/design_approvals/air_software/media/TC-14-49.pdf)
225 lines
5.4 KiB
Plaintext
225 lines
5.4 KiB
Plaintext
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General Message Format
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======================
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Currently messages can maximally use 22 bytes for data because:
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- maximum buffer size if 24 bytes
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- the internal buffer needs an additional flags byte
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- a message contains a checksum byte
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 n payload data (depending on command code)
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PING Message
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============
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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PONG Message
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============
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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Address Messages
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================
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This includes HAVE_ADDRESS, CLAIM_ADDRESS and DENY_ADDRESS.
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 4 UID of the sending node
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8 1 bus address
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RANGE Message
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=============
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 1 first available address
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5 1 last available address
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FLASH_START Message
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===================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 2 message number
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6 2 address
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FLASH_ADDR Message
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==================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 2 message number
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6 2 address
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FLASH_DATA Message
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==================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 2 message number
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6 n up to 8 words to write at given address
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FLASH_END Message
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=================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 2 message number
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Flash_Response Message
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======================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 2 message number
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6 1 response code (0 if okay, error code otherwise)
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VALUE2 Message
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==============
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 4 UID of the sending node
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8 1 value id
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9 1 value type
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10 2 value
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12 2 denom
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DEVICE Message
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==============
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 4 UID of the sending node
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8 2 firmware type
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10 2 firmware version
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12 2 modules mask
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SENDSTATS Message
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=================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 4 UID of the sending node
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8 2 packets out
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10 2 collisions
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12 2 aborted
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14 2 no buffer errors
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RECVSTATS Message
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=================
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Offset Length Meaning
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---------------------------------------------------------
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0 1 destination address
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1 1 remaining message length
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2 1 command code
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3 1 source address
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---------------------------------------------------------
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4 4 UID of the sending node
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8 2 packets in
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10 2 crc errors
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12 2 io errors
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14 2 no buffer errors
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16 2 handled packets
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18 2 missed
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