Temperature Sensor not initialized after bus rescan

[gonium]

Behaviour: The first get request (via hexaswitch) returns a temperature of 85 deg C. Subsequent requests return an adequate reading. The serial console reads:

size of packet: 9
-- Temperature: Get value
CRC Error (lost connection?)
*** problems - rescanning bus ...
Scanning Bus for DS18X20
1 DS18X20 Sensor(s) available
Current temp: 85.0000 deg C
14 bytes sent.
size of packet: 9
-- Temperature: Get value
Current temp: 23.6875 deg C
14 bytes sent.
size of packet: 9
-- Temperature: Get value
Current temp: 23.6875 deg C
14 bytes sent.
size of packet: 9
-- Temperature: Get value
Current temp: 23.6875 deg C
14 bytes sent.

[gonium]

On development branch, commit 7e8ae40

[EmbeddedBrains]

This behavior ist quite normal. In case of reqesting a temperature value without triggering a conversion, you will receive the default reading. This is +85°C (datasheet DS18S20 page 2 "The power-on reset value of the temperature register is +85°C")

[domke]

jep, this is my theory as well. I will consider to update the code to make sure to trigger a conversion bevor returning a reading.

[paalsteek]

What's the state of this issue?