Matrix-orbital DD-DB1 LCD/VFD Dev Board User Manual download pdf (Page 28)

5. Dallas 1-Wire

5.1.Search for a

1-Wire Device

Dec

Hex

254 200 2

FE C8 02

Sends a search query to all of the up to 32 devices on the one wire bus. Any connected device will respond with a

identification packet.

Response 14 bytes, identification packet as shown below

Offset Length Value Description

0 2 9002 Preamble

2 1 138 Another device packet will follow OR

10 Last device packet

3 1 49 Packet Type

4 1 0 Error Code (0 indicates success)

5 8 Device Address

13 1 0 CRC8 address check (0 indicates validity)

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 46 47

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Matrix-orbital DD-DB1 LCD/VFD Dev Board User Manual Page 28