# \ calculations, nonstandard? **URL:** \ **Category:** Uncategorized\ **Created:** [January 11, 2022, 10:37am UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357 "2022-01-11T10:37:56Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![Tobias\_Lindblom](https://yyz2.discourse-cdn.com/free1/user_avatar/aravis-project.discourse.group/tobias_lindblom/32/124_2.png) [@Tobias\_Lindblom](https://aravis-project.discourse.group/u/Tobias_Lindblom)\ **Post date:** [January 11, 2022, 10:37am UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357/1 "2022-01-11T10:37:56Z")
In the genicam xml code for my camera (FLIR SC7600 infrared cam) there are several calculations for device registers but I do not understand the mathematical expression within the formula tags example: \(SEL = 1) ? 0x0000A050 : ((SEL = 2) ? 0x0000A054 : ((SEL = 3) ? 0x0000BB54 : ((SEL = 4) ? 0x0000BB58 : ((SEL = 5) ? 0x0000BB5C : ((SEL = 6) ? 0x0000BB60 : ((SEL = 7) ? 0x0000A04C : ((SEL = 8) ? 0x0000A058 : (0xFFFFFFFF))))))))\ Any ideas? ---
**Author:** ![Emmanuel](https://yyz2.discourse-cdn.com/free1/user_avatar/aravis-project.discourse.group/emmanuel/32/198_2.png) [@Emmanuel](https://aravis-project.discourse.group/u/Emmanuel)\ **Post date:** [January 13, 2022, 7:57am UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357/2 "2022-01-13T07:57:30Z")
Hi Tobias, It is just an ugly array access. `output = array[SEL] if SEL in [1..8], 0xffffffff otherwise` with: `array = {0x0000A050, 0x0000A054, 0x0000BB54, 0x0000BB58, 0x0000BB5C, 0x0000BB60, 0x0000A04C, 0x0000A058}` Emmanuel. ---
**Author:** ![Tobias\_Lindblom](https://yyz2.discourse-cdn.com/free1/user_avatar/aravis-project.discourse.group/tobias_lindblom/32/124_2.png) [@Tobias\_Lindblom](https://aravis-project.discourse.group/u/Tobias_Lindblom)\ **Post date:** [January 13, 2022, 6:50pm UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357/3 "2022-01-13T18:50:39Z")
Thanks! I am trying to figure out registers on our camera (FLIR/CEDIP, SC7600 ) not in the xml file. It has a message channel, needed for additional functionality, but i am unable to get it started and need to figure out a few of the registers that according to wireshark is being written/read to. Tobias ---
**Author:** ![Emmanuel](https://yyz2.discourse-cdn.com/free1/user_avatar/aravis-project.discourse.group/emmanuel/32/198_2.png) [@Emmanuel](https://aravis-project.discourse.group/u/Emmanuel)\ **Post date:** [January 17, 2022, 3:57pm UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357/4 "2022-01-17T15:57:51Z")
> [@Tobias\_Lindblom](#): > > I am trying to figure out registers on our camera (FLIR/CEDIP, SC7600 ) not in the xml file. > It has a message channel, needed for additional functionality, but i am unable to get it started and need to figure out a few of the registers that according to wireshark is being written/read to. Events are not supported yet by Aravis. It would be a nice addition. It should be quite simple to add, we already have a thread for the heartbeat mechanism that could also handle incoming event packets. But as usual this work can only be done by reverse engineering. Emmanuel. ---
**Author:** ![Tobias\_Lindblom](https://yyz2.discourse-cdn.com/free1/user_avatar/aravis-project.discourse.group/tobias_lindblom/32/124_2.png) [@Tobias\_Lindblom](https://aravis-project.discourse.group/u/Tobias_Lindblom)\ **Post date:** [February 1, 2022, 12:41pm UTC](https://aravis-project.discourse.group/t/formula-calculations-nonstandard/357/5 "2022-02-01T12:41:10Z")
FUI: UDP payload of these packages from my camera starts with: 0x420000c2 then some length, counter and timestamp. 1 byte per package or just an OK seems to be sent for each write to UART register. example 420000c20014010f00009000ffff00000000000004db484901000000 means “OK or character recieved” when it starts to transmit a sequence, several packages looking like: 420000c20018011700009000ffff00000000000004dbc73b020000000200c100 here the fourth byte from the end is important (0x02) signalling STX several more packages follow. example of characters/numbers response sequence (once the right command have been issues via writes to the UART register): 0x02 (STX) 0x0d (length 13) 0x00 (NUL) 0x47 ( G ) 0x53 ( S ) 0x4E ( N ) 0x2C ( , ) 0x31 ( 1 ) 0x2C ( , ) 0x31 ( 1 ) 0x35 ( 5 ) 0x38 ( 8 ) 0x39 ( 9 ) 0x34 ( 4 ) 0x32 ( 2 ) 0x2C ( , ) 0xDA (checksum) 0x03 (EAX) message reads GSN,1,158942 meaning: Get Camera Serial Number, command was understood and executed, serial 158942