There is no difference between 4k erase and sector erase.
But sector erase would previously do `.block_erase` which would not
erase a sector (4k) but a whole block (64k).
Fortunately all boards declare `SPI_NOR_F_SECT_4K` and all file systems
don't try to erase anything smaller, so this was never triggered.
Add an `assert(0)` to crash instead of corrupting data.
cpu/$(CPU)/Makefile.features and cpu/$(CPU)/Makefile.dep are
automatically included
The multiple boards handling has been changed to use 'CPU_MODEL ?='.
Part of moving CPU/CPU_MODEL definition to Makefile.features to have it
available before Makefile.include.
Keep the compiled '.bin' file to remove the need to compile it when
flashing. This remove the need to have the toolchain when flashing so
allow compiling and flashing with `BUILD_IN_DOCKER=1` without a local
toolchain.
Even if it ends up storing a binary, the file is only 34 bytes.
With the canned recipe for flashing, flash dependencies should be
added to FLASHDEPS, instead of writing `flash: dependencies`. This
ensures that both flash and flash-only depend on the same prerequisites.
This allows a board configuration to select which kind of averaging
should be applied to the pin instead of always using 32 sample average.
Very high impedance sources may need to disable hardware averaging in
order to give correct values, the on-chip temperature sensor is one such
signal source.
A dispatcher function is implemented for directing writes to the correct
function. The dispatcher is bypassed completely if the CPU only contain
one kind of UART module.
There are at least two different UART hardware modules deployed in
different Kinetis CPU families (or possibly three or more when counting
variations of the UART module). The UART module is an older 8 bit module
with advanced functionality, while the LPUART is a 32 bit module with
focus on low power consumption.
- The older families in the K series all have UART modules.
- The K22F family have both UART and LPUART modules in the same CPU.
- Older L series (e.g. KL25Z) have two variations of the UART module
- Newer L series (e.g. KL43Z) have LPUART modules, and sometimes
UART as well.
- Newer W series (KW41Z) have only LPUART
