taking a semaphore on F765 takes about 1.3us. About 1.5us for a
recursive semaphore
On a F405 it costs about 2.6us for semaphore, about 2.8us for
recursive semaphore
../../Tools/CPUInfo/CPUInfo.cpp:21:54: warning: format ‘%d’ expects argument of type ‘int’, but argument 3 has type ‘long unsigned int’ [-Wformat=]
hal.console->printf("char : %d\n", sizeof(char));
^
And so on.
Ideally for sizeof() which returns size_t we would use %zu, but that's not
implemented by our version of printf. So use %lu which should be ok in all of
our boards.
The switching between different AP_HAL was happening by giving different
definitions of AP_HAL_BOARD_DRIVER, and the programs would use it to
instantiate.
A program or library code would have to explicitly include (and depend)
on the concrete implementation of the HAL, even when using it only via
interface.
The proposed change move this dependency to be link time. There is a
AP_HAL::get_HAL() function that is used by the client code. Each
implementation of HAL provides its own definition of this function,
returning the appropriate concrete instance.
Since this replaces the job of AP_HAL_BOARD_DRIVER, the definition was
removed.
The static variables for PX4 and VRBRAIN were named differently to avoid
shadowing the extern symbol 'hal'.
This commit changes the way libraries headers are included in source files:
- If the header is in the same directory the source belongs to, so the
notation '#include ""' is used with the path relative to the directory
containing the source.
- If the header is outside the directory containing the source, then we use
the notation '#include <>' with the path relative to libraries folder.
Some of the advantages of such approach:
- Only one search path for libraries headers.
- OSs like Windows may have a better lookup time.
- Allows use of hardware floating point on the Cortex-M4.
- Added "f" suffix to floating point literals.
- Call floating point versions of stdlib math functions.
Michael Oborne
Andy Piper
Andrew Tridgell
Siddharth Purohit
Eugene Shamaev
Pierre Kancir
murata
Mathieu OTHACEHE
Gustavo Jose de Sousa
Lucas De Marchi
Ricardo de Almeida Gonzaga
Caio Marcelo de Oliveira Filho
Randy Mackay
Andrew Tridgell
James Bielman