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5. Dallas One-Wire

5.1. Search for a One-Wire

Device

Dec

Hex

254 200 2

FE C8 02

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

an identification packet.

Response

14 bytes, identification packet as shown below

Table 23: Dallas One-Wire Packet Information

Offset

Length

Value

Description

9002

Preamble

138

Another device packet will follow OR

Last device packet

Packet Type

Error Code (0 indicates success)

Device Address

CRC8 address check (0 indicates validity)

5.2. Dallas One-Wire

Transaction

Dec

Hex

254 200 1

FE C8 01

Flags Send Bits Receive Bits Data

Performs a single Dallas 1-Wire transaction. Consult your device documentation for information regarding device

specific protocols. If an error is encountered, a corresponding value will be returned by the device.

Flags

1 byte, flags for transaction, see below

Send Bits

1 byte, number of bytes to be sent to the device

Receive Bits

1 byte, number of bytes expected to be received from the device

Data

Variable, data to be transmitted LSB to MSB

Table 24: Dallas One-Wire Flag Table

Bit

Flag Description

Unused

0 (Future Compatibility)

Add CRC8 to transaction

0 (Future Compatibility)

Read CRC8 from transaction

Reset Bus prior to transaction

Table 25: Dallas One-Wire Error Table

Code

Error Description

Success

Unknown Command

No Devices Found

Fatal Search Error

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 42 43

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