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nuttx/boards/arm/lpc17xx_40xx/pnev5180b
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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 make/expression: improving up asm/C/C++ compile times 2020-11-02 07:53:53 -08:00
include Fix nxstyle issue 2020-06-07 19:28:10 +01:00
kernel sched: Rename task_startup to nxtask_startup 2020-07-01 07:55:33 -06:00
scripts make/expression: improving up asm/C/C++ compile times 2020-11-02 07:53:53 -08:00
src build: Remove the empty variable assignment 2020-05-24 08:24:13 -06:00
Kconfig
README.txt

README.txt 

README
^^^^^^

README for NuttX port to NXP's PNEV5180B, which is a development board
containing a NXP-LPC1769 MCU and a PN5180 NFC Frontend.

Contents
^^^^^^^^

  NXP's PNEV5180B Board
  Configurations

NXP's PNEV5180B Board
^^^^^^^^^^^^^^^^^^^^^

  Pin Description                      On Board       Connector
  -------------------------------- ---------------- -------------
  P0.2/TXD0/AD0.7                    TX               J201
  P0.3/RXD0/AD0.6                    RX
  P0.22/RTS1/TD1                     LD200            ORANGE LED
  P0.15/TXD1/SCK0/SCK                PN5180-SCK
  P0.16/RXD1/SSEL0/SSEL              PN5180-SSEL      PN5180
  P0.17/CTS1/MISO0/MISO              PN5180-MISO
  P0.18/DCD1/M0SI0/MOSI              PN5180-MOSI
  P0.19/DSR1/SDA1                    EEPROM           (Not Assembled)
  P0.20/DTR1/SCL1                    EEPROM
  P0.21/RI1/RD1                      PN5180-AUX2      PN5180
  P0.29/USB_D+                       USB-D+           USB
  P0.30/USB_D-                       USB-D-
  P2.0/PWM1.1/TXD1                   LD201            RED LED
  P2.5/PWM1.6/DTR1/TRACEDATA0        PN5180-nPN_RST
  P2.9/USB_CONNECT/RXD2              USB_CONNECT      USB
  P2.11/nEINT1/I2STX_CLK             PN5180-BUSY      PN5180
  P2.12/nEINT2/I2STX_WS              PN5180-IRQ
  P3.25/MAT0.0/PWM1.2                LD203            GREEN LED
  P3.26/STCLK/MAT0.1/PWM1.3          LD202            BLUE LED

NXP's PNEV5180B Board
^^^^^^^^^^^^^^^^^^^^^

UART
----

  Board             LPC1769
  Signal            Pin
  ----------------- -----------------
  TX                P0.2  TXD0
  RX                P0.3  RXD0

USB
---

  Board             LPC1769
  Signal            Pin
  ----------------- -----------------
  USB_CONNECT       P2.9  USB_CONNECT
  USB_DM            P0.29 USB_D-
  USB_DP            P0.30 USB_D+

PN5180
------

  Board             LPC1769
  Signal            Pin
  ----------------- -----------------
  PN5180_SCK        P0.15 SCK
  PN5180_SSEL       P0.16 SSEL
  PN5180_MISO       P0.17 MISO
  PN5180_MOSI       P0.18 MOSI
  PN5180_AUX2       P0.21 GPIO I
  PN5180_nPN_RST    P2.5  GPIO O
  PN5180_BUSY       P2.11 GPIO I
  PN5180_IRQ        P2.12 GPIO I

Configurations
^^^^^^^^^^^^^^

Each PNEV5180B configuration is maintained in a sub-directory and can be
selected as follow:

    cd tools
    ./configure.sh pnev5180b:<subdir>
    cd -

Where <subdir> is one of the following:

  nsh:
    Configures the NuttShell (nsh) located at apps/system/nsh.  The
    Configuration enables the serial NSH interface.

    NOTES:

    1. This configuration uses the mconf-based configuration tool.  To
       change this configurations using that tool, you should:

       a. Build and install the kconfig-mconf tool.  See nuttx/README.txt
          see additional README.txt files in the NuttX tools repository.

       b. Execute 'make menuconfig' in nuttx/ in order to start the
          reconfiguration process.

  usbnsh:
    Configures the NuttShell (nsh) located at apps/system/nsh.  The
    Configuration enables the CDC/ACM based NSH interface on /dev/ttyACM0.

  nsh-cdcecm:
    Configures the NuttShell (nsh) to provide a terminal on UART0.  The
    Configuration also provides network interface eth0 via CDC/ECM.

  usbnsh-cdcecm:
    This configuration includes a USB Composite Device with both CDC/ACM and
    CDC/ECM.  NuttShell provides a terminal via CDC/ACM.  A network interface
    (eth0) is also provided via CDC/ECM.

  knsh:
    This is identical to the nsh configuratio above except that NuttX
    is built as a kernel-mode, monolithic module and the user applications
    are built separately.