README
======

  This directory contains the port to the NXP LPCXpress-LPC54628 board
  (OMI1309UL).  This board features:

    - LPC54628 Cortex-M4 microcontroller running at up to 220MHz
    - 272x480 color LCD with capacitive touch screen
    - On-board, high-speed USB, Link2 debug probe with CMSIS-DAP and SEGGER
      J-Link protocol options
    - UART and SPI port bridging from LPC546xx target to USB via the on-
      board debug probe
    - Support for external debug probe
    - 3 x user LEDs, plus Reset, ISP (3) and user buttons
    - Multiple Expansion options, including Arduino UNO and PMod
    - Built-in power consumption measurement for target LPC546xx MCU
    - 128Mb Micron MT25QL128 Quad-SPI flash
    - 16MB Micron MT48LC8M16A2B4 SDRAM
    - Knowles SPH0641LM4H digital microphone
    - Full size SD/MMC card slot
    - NXP MMA8652FCR1 accelerometer
    - Stereo audio codec with line in/out
    - High and full speed USB ports with micro A/B connector for host or
      device functionality
    - 10/100Mbps Ethernet (RJ45 connector)

STATUS
======

  2017-12-10:  The basic NSH configuration is functional at 220MHz with a
    Serial console, timer and LED support.  Added support for the external
    SDRAM and for the RAM test utility -- UNTESTED!

Configurations
==============

  Information Common to All Configurations
  ----------------------------------------
  Each LPCXpresso-LPC54628 configuration is maintained in a sub-directory
  and can be selected as follow:

    .tools/configure.sh [OPTIONS] xmc5400-relax/<subdir>

  See '.tools/configure.sh -h' for a list of all options.  The most typical
  are -l to select the Linux host or -c to select the Windows Cygwin host.

  Before starting the build, make sure that your PATH environment variable
  includes the correct path to your toolchain.

  And then build NuttX by simply typing the following.  At the conclusion of
  the make, the nuttx binary will reside in an ELF file called, simply, nuttx.

    make

  The <subdir> that is provided above as an argument to the tools/configure.sh
  must be is one of the following.

  NOTES:

    1. These configurations use the mconf-based configuration tool.  To
      change any of these 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.

    2. Unless stated otherwise, all configurations generate console
       output on USART0 (aka Flexcomm0).  USART0 connects to the serial
       bridge on LPC4322JET100 and should be available as a USB serial
       device on your host PC.

    3. All of these configurations are set up to build under Windows using
       the  "GNU Tools for ARM Embedded Processors" that is maintained by
       ARM (unless stated otherwise in the description of the configuration).

         https://developer.arm.com/open-source/gnu-toolchain/gnu-rm

       That toolchain selection can easily be reconfigured using
       'make menuconfig'.  Here are the relevant current settings:

       Build Setup:
         CONFIG_HOST_WINDOWS=y               : Window environment
         CONFIG_WINDOWS_CYGWIN=y             : Cywin under Windows

       System Type -> Toolchain:
         CONFIG_ARMV7M_TOOLCHAIN_GNU_EABIW=y : GNU ARM EABI toolchain

  Configuration sub-directories
  -----------------------------

  nsh:

    Configures the NuttShell (nsh) application located at examples/nsh.
    This configuration was used to bring up the board support and, hence,
    is focused on low level, command-line driver testing.  It has no
    network.

    NOTES:

    1. NSH built-in applications are supported.

       Binary Formats:
         CONFIG_BUILTIN=y           : Enable support for built-in programs

       Application Configuration:
         CONFIG_NSH_BUILTIN_APPS=y  : Enable starting apps from NSH command line

    2. SDRAM support is enabled, but the SDRAM is *not* added to the system
       heap.  The apps/system/ramtest utility is include in the build as an
       NSH builtin function that can be used to verify the SDRAM.