The PR removed the bulk of non-newlib headers from the NodeMCU source base.
app/libc has now been cut down to the bare minimum overrides to shadow the
corresponding functions in the SDK's libc. The old c_xyz.h headerfiles have been
nuked in favour of the standard <xyz.h> headers, with a few exceptions over in
sdk-overrides. Again, shipping a libc.a without headers is a terrible thing to do. We're
still living on a prayer that libc was configured the same was as a default-configured
xtensa gcc toolchain assumes it is. That part I cannot do anything about, unfortunately,
but it's no worse than it has been before.
This enables our source files to compile successfully using the standard header files,
and use the typical malloc()/calloc()/realloc()/free(), the strwhatever()s and
memwhatever()s. These end up, through macro and linker magic, mapped to the
appropriate SDK or ROM functions.
1) Signal incorect reading when the sensor is disconnected.
2) Reset humidity oversampling settings when calling `bme280.startreadout()` - if the sensor is reconnected and readouts are in forced mode there is no need to re-initialize the sensor (`bme280.init()`).
Johny Mattsson
Terry Ellison
sergio
Arnim Läuger
FrankX
vsky
Yury Popov
vsky