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b88561299b
nuttx/boards/arm/stm32f0l0g0/nucleo-g070rb
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chao.an b88561299b make/expression: improving up asm/C/C++ compile times 
In the current compilation environment, the recursive assignment(=) for compile
flags will be delayed until every file is actually need to be compile.

For example:
--------------------------------------------------------------------------------
arch/arm/src/Makefile:

INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)chip}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)common}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(ARCH_SRCDIR)$(DELIM)$(ARCH_SUBDIR)}
INCLUDES += ${shell $(INCDIR) "$(CC)" $(TOPDIR)$(DELIM)sched}

CPPFLAGS += $(INCLUDES) $(EXTRAFLAGS)
CFLAGS += $(INCLUDES) $(EXTRAFLAGS)
CXXFLAGS += $(INCLUDES) $(EXTRAFLAGS)
AFLAGS += $(INCLUDES) $(EXTRAFLAGS)
--------------------------------------------------------------------------------

All compilation options will be included recursively,
which will be delayed until the compilation options are actually used:

tools/Config.mk:

--------------------------------------------------------------------------------
define COMPILE
  @echo "CC: $1"
  $(Q) $(CC) -c $(CFLAGS) $($(strip $1)_CFLAGS) $1 -o $2
endef
--------------------------------------------------------------------------------

All compile flags to be reexecuted $(INCDIR) as long as one file needs to be compiled,
but in fact, the compilation options have not changed in the current directory.

So the we recommand to change the syntax of assignment
From
    Recursive (=)
To
    Simple    (:=)

In this way, we can ensure that all compilation options are expanded only once and reducing repeated works.

Signed-off-by: chao.an <anchao@xiaomi.com>
2020-11-02 07:53:53 -08:00
..
configs/nsh libc/stdio: Allocate file_struct dynamically 2020-09-11 17:58:17 +08:00
include arch/arm/src/stm32f0l0g0/ and boards/arm/stm32f0l0g0/nucleo-g070rb/include/board.h: Add I2C pinmap. In Kconfig select I2C2 for this part. Update I2C pin definitions in board.h. 2019-12-20 13:02:13 -06:00
scripts make/expression: improving up asm/C/C++ compile times 2020-11-02 07:53:53 -08:00
src Fix nxstyle issue 2020-06-07 19:28:10 +01:00
Kconfig boards/arm/stm32f0l0g0/nucleo-g070rb: Initial support for board STM32 NUCLEO-G070RB, including NSH config 2019-09-17 11:20:26 -06:00
README.txt boards/arm/stm32f0l0g0/nucleo-g070rb: Enable I2C. 2019-12-20 13:04:34 -06:00

README.txt 

Nucleo-64 Boards
================

The Nucleo-G070RB is a member of the Nucleo-64 board family.

STATUS
======

  2019-09-04: Initial support for the STM32 Nucleo-G070RB board, based on STM32 Nucleo-G071RB.
              Basic NSH configuration is functional.
  2019-09-16: Enable PWR peripheral and increase sysclk to max. frequency.
  2019-10-04: Enable basic timer TIM6. Timer example working.
  2019-10-17: Add PWM support. PWM example working.
  2019-11-04: Add button driver and GPIO driver support. Buttons and GPIO examples working.
  2019-12-20: Add i2C driver driver support and i2C tool.