if A0-3 are not 1, will break resolution switch statement()

[karlg100]

Arduino-Temperature-Control-Library/DallasTemperature.cpp

Line 351 in 798cfc2

switch (scratchPad[CONFIGURATION]) {

It appears this switch statement will fail if any of the A0-3 bits are pulled down.

This is because bits 0-3 match these hardware set address bits. Default they are pulled up. But a user can configure these with hardware or dynamically pulling up or down.

The CONFIGURATION bit probably needs to be masked out with a | of 11110000 or 0xF0, then the macros redefined to be 0xN0.

Not sure what other repercussions this change would have however.

[MalcolmBoura]

There is the same problem in setResolution(). It won't actually fail but it may write when it does not need to.
Needs a systematic look through all of the code.

[MalcolmBoura]

The correct fix is to write a Scratchpad class which hides the details of how to access things such as the resolution. I have one in preparation.