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uBlox UBX checksum calculator

 1 year ago
source link: https://gist.github.com/tomazas/3ab51f91cdc418f5704d
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uBlox UBX checksum calculator · GitHub

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uBlox UBX checksum calculator

Hi,
i tried it on on the last command at this link

https://ukhas.org.uk/guides:ublox_psm

GPS Cold Start (Forced Watchdog)
0xB5, 0x62, 0x06, 0x04, 0x04, 0x00, 0xFF, 0x87, 0x00, 0x00, 0x94, 0xF5

it fails

it throws
0x94 0x1D instead of above 0x94 0xF5

not sure which is correct, can you please help

Author

You are calculating it wrong. The checksum is calculated only from payload bytes, i.e.: 0x06, 0x04, 0x04, 0x00, 0xFF, 0x87, 0x00, 0x00
No header or checksum bytes are involved in calculation.

After running with your payload, the result is:
UBX packet checksum: 0x94,0xF5


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