nuttx/configs/olimex-lpc1766stk/README.txt

README
^^^^^^

README for NuttX port to the Olimex LPC1766-STK development board

Contents
^^^^^^^^

  Olimex LPC1766-STK development board
  Development Environment
  GNU Toolchain Options
  IDEs
  NuttX buildroot Toolchain
  LEDs
  Using OpenOCD and GDB with an FT2232 JTAG emulator
  Olimex LPC1766-STK Configuration Options
  Configurations

Olimex LPC1766-STK development board
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  GPIO Usage:
  -----------

  GPIO                             PIN  SIGNAL NAME
  -------------------------------- ---- --------------
  P0[0]/RD1/TXD3/SDA1               46  RD1
  P0[1]/TD1/RXD3/SCL1               47  TD1
  P0[2]/TXD0/AD0[7]                 98  TXD0
  P0[3]/RXD0/AD0[6]                 99  RXD0
  P0[4]/I2SRX_CLK/RD2/CAP2[0]       81  LED2/ACC IRQ
  P0[5]/I2SRX_WS/TD2/CAP2[1]        80  CENTER
  P0[6]/I2SRX_SDA/SSEL1/MAT2[0]     79  SSEL1
  P0[7]/I2STX_CLK/SCK1/MAT2[1]      78  SCK1
  P0[8]/I2STX_WS/MISO1/MAT2[2]      77  MISO1
  P0[9]/I2STX_SDA/MOSI1/MAT2[3]     76  MOSI1
  P0[10]/TXD2/SDA2/MAT3[0]          48  SDA2
  P0[11]/RXD2/SCL2/MAT3[1]          49  SCL2
  P0[15]/TXD1/SCK0/SCK              62  TXD1
  P0[16]/RXD1/SSEL0/SSEL            63  RXD1
  P0[17]/CTS1/MISO0/MISO            61  CTS1
  P0[18]/DCD1/MOSI0/MOSI            60  DCD1
  P0[19]/DSR1/SDA1                  59  DSR1
  P0[20]/DTR1/SCL1                  58  DTR1
  P0[21]/RI1/RD1                    57  MMC PWR
  P0[22]/RTS1/TD1                   56  RTS1
  P0[23]/AD0[0]/I2SRX_CLK/CAP3[0]    9  BUT1
  P0[24]/AD0[1]/I2SRX_WS/CAP3[1]     8  TEMP
  P0[25]/AD0[2]/I2SRX_SDA/TXD3       7  MIC IN
  P0[26]/AD0[3]/AOUT/RXD3            6  AOUT
  P0[27]/SDA0/USB_SDA               25  USB_SDA
  P0[28]/SCL0/USB_SCL               24  USB_SCL
  P0[29]/USB_D+                     29  USB_D+
  P0[30]/USB_D-                     30  USB_D-
  P1[0]/ENET_TXD0                   95  E_TXD0
  P1[1]/ENET_TXD1                   94  E_TXD1
  P1[4]/ENET_TX_EN                  93  E_TX_EN
  P1[8]/ENET_CRS                    92  E_CRS
  P1[9]/ENET_RXD0                   91  E_RXD0
  P1[10]/ENET_RXD1                  90  E_RXD1
  P1[14]/ENET_RX_ER                 89  E_RX_ER
  P1[15]/ENET_REF_CLK               88  E_REF_CLK
  P1[16]/ENET_MDC                   87  E_MDC
  P1[17]/ENET_MDIO                  86  E_MDIO
  P1[18]/USB_UP_LED/PWM1[1]/CAP1[0] 32  USB_UP_LED
  P1[19]/MC0A/#USB_PPWR/CAP1[1]     33  #USB_PPWR
  P1[20]/MCFB0/PWM1[2]/SCK0         34  SCK0
  P1[21]/MCABORT/PWM1[3]/SSEL0      35  SSEL0
  P1[22]/MC0B/USB_PWRD/MAT1[0]      36  USBH_PWRD
  P1[23]/MCFB1/PWM1[4]/MISO0        37  MISO0
  P1[24]/MCFB2/PWM1[5]/MOSI0        38  MOSI0
  P1[25]/MC1A/MAT1[1]               39  LED1
  P1[26]/MC1B/PWM1[6]/CAP0[0]       40  CS_UEXT
  P1[27]/CLKOUT/#USB_OVRCR/CAP0[1]  43  #USB_OVRCR
  P1[28]/MC2A/PCAP1[0]/MAT0[0]      44  P1.28
  P1[29]/MC2B/PCAP1[1]/MAT0[1]      45  P1.29
  P1[30]/VBUS/AD0[4]                21  VBUS
  P1[31]/SCK1/AD0[5]                20  AIN5
  P2[0]/PWM1[1]/TXD1                75  UP
  P2[1]/PWM1[2]/RXD1                74  DOWN
  P2[2]/PWM1[3]/CTS1/TRACEDATA[3]   73  TRACE_D3
  P2[3]/PWM1[4]/DCD1/TRACEDATA[2]   70  TRACE_D2
  P2[4]/PWM1[5]/DSR1/TRACEDATA[1]   69  TRACE_D1
  P2[5]/PWM1[6]/DTR1/TRACEDATA[0]   68  TRACE_D0
  P2[6]/PCAP1[0]/RI1/TRACECLK       67  TRACE_CLK
  P2[7]/RD2/RTS1                    66  LEFT
  P2[8]/TD2/TXD2                    65  RIGHT
  P2[9]/USB_CONNECT/RXD2            64  USBD_CONNECT
  P2[10]/#EINT0/NMI                 53  ISP_E4
  P2[11]/#EINT1/I2STX_CLK           52  #EINT1
  P2[12]/#EINT2/I2STX_WS            51  WAKE-UP
  P2[13]/#EINT3/I2STX_SDA           50  BUT2
  P3[25]/MAT0[0]/PWM1[2]            27  LCD_RST
  P3[26]/STCLK/MAT0[1]/PWM1[3]      26  LCD_BL

  Serial Console
  --------------

  The LPC1766-STK board has two serial connectors.  One, RS232_0, connects to
  the LPC1766 UART0.  This is the DB-9 connector next to the power connector.
  The other RS232_1, connect to the LPC1766 UART1.  This is he DB-9 connector
  next to the Ethernet connector.

  Simple UART1 is the more flexible UART and since the needs for a serial
  console are minimal, the more minimal UART0/RS232_0 is used for the NuttX
  system console.  Of course, this can be changed by editting the NuttX
  configuration file as discussed below.

  The serial console is configured as follows (57600 8N1):

    BAUD: 57600
    Number of Bits: 8
    Parity: None
    Stop bits: 1

  You will need to connect a monitor program (Hyperterminal, Tera Term,
  minicom, whatever) to UART0/RS232_0 and configure the serial port as
  shown above.

  NOTE: The ostest example works fine at 115200, but the other configurations
  have problems at that rate (probably because they use the interrupt driven
  serial driver).  Other LPC17xx boards with the same clocking will run at
  115200.

Development Environment
^^^^^^^^^^^^^^^^^^^^^^^

  Either Linux or Cygwin on Windows can be used for the development environment.
  The source has been built only using the GNU toolchain (see below).  Other
  toolchains will likely cause problems. Testing was performed using the Cygwin
  environment.

GNU Toolchain Options
^^^^^^^^^^^^^^^^^^^^^

  The NuttX make system has been modified to support the following different
  toolchain options.

  1. The CodeSourcery GNU toolchain,
  2. The devkitARM GNU toolchain,
  3. The NuttX buildroot Toolchain (see below).

  All testing has been conducted using the NuttX buildroot toolchain.  However,
  the make system is setup to default to use the devkitARM toolchain.  To use
  the CodeSourcery or devkitARM toolchain, you simply need add one of the
  following configuration options to your .config (or defconfig) file:

    CONFIG_LPC17_CODESOURCERYW=y   : CodeSourcery under Windows
    CONFIG_LPC17_CODESOURCERYL=y   : CodeSourcery under Linux
    CONFIG_LPC17_DEVKITARM=y       : devkitARM under Windows
    CONFIG_LPC17_BUILDROOT=y       : NuttX buildroot under Linux or Cygwin (default)

  If you are not using CONFIG_LPC17_BUILDROOT, then you may also have to modify
  the PATH in the setenv.h file if your make cannot find the tools.

  NOTE: the CodeSourcery (for Windows)and devkitARM are Windows native toolchains.
  The CodeSourcey (for Linux) and NuttX buildroot toolchains are Cygwin and/or
  Linux native toolchains. There are several limitations to using a Windows based
  toolchain in a Cygwin environment.  The three biggest are:

  1. The Windows toolchain cannot follow Cygwin paths.  Path conversions are
     performed automatically in the Cygwin makefiles using the 'cygpath' utility
     but you might easily find some new path problems.  If so, check out 'cygpath -w'

  2. Windows toolchains cannot follow Cygwin symbolic links.  Many symbolic links
     are used in Nuttx (e.g., include/arch).  The make system works around these
     problems for the Windows tools by copying directories instead of linking them.
     But this can also cause some confusion for you:  For example, you may edit
     a file in a "linked" directory and find that your changes had not effect.
     That is because you are building the copy of the file in the "fake" symbolic
     directory.  If you use a Windows toolchain, you should get in the habit of
     making like this:

       make clean_context all

     An alias in your .bashrc file might make that less painful.

  3. Dependencies are not made when using Windows versions of the GCC.  This is
     because the dependencies are generated using Windows pathes which do not
     work with the Cygwin make.

     Support has been added for making dependencies with the windows-native toolchains.
     That support can be enabled by modifying your Make.defs file as follows:

    -  MKDEP                = $(TOPDIR)/tools/mknulldeps.sh
    +  MKDEP                = $(TOPDIR)/tools/mkdeps.sh --winpaths "$(TOPDIR)"

     If you have problems with the dependency build (for example, if you are not
     building on C:), then you may need to modify tools/mkdeps.sh

  NOTE 1: The CodeSourcery toolchain (2009q1) does not work with default optimization
  level of -Os (See Make.defs).  It will work with -O0, -O1, or -O2, but not with
  -Os.

  NOTE 2: The devkitARM toolchain includes a version of MSYS make.  Make sure that
  the paths to Cygwin's /bin and /usr/bin directories appear BEFORE the devkitARM
  path or will get the wrong version of make.

IDEs
^^^^

  NuttX is built using command-line make.  It can be used with an IDE, but some
  effort will be required to create the project (There is a simple RIDE project
  in the RIDE subdirectory).
  
  Makefile Build
  --------------
  Under Eclipse, it is pretty easy to set up an "empty makefile project" and
  simply use the NuttX makefile to build the system.  That is almost for free
  under Linux.  Under Windows, you will need to set up the "Cygwin GCC" empty
  makefile project in order to work with Windows (Google for "Eclipse Cygwin" -
  there is a lot of help on the internet).

  Native Build
  ------------
  Here are a few tips before you start that effort:

  1) Select the toolchain that you will be using in your .config file
  2) Start the NuttX build at least one time from the Cygwin command line
     before trying to create your project.  This is necessary to create
     certain auto-generated files and directories that will be needed.
  3) Set up include pathes:  You will need include/, arch/arm/src/lpc17xx,
     arch/arm/src/common, arch/arm/src/cortexm3, and sched/.
  4) All assembly files need to have the definition option -D __ASSEMBLY__
     on the command line.

  Startup files will probably cause you some headaches.  The NuttX startup file
  is arch/arm/src/lpc17x/lpc17_vectors.S.

NuttX buildroot Toolchain
^^^^^^^^^^^^^^^^^^^^^^^^^

  A GNU GCC-based toolchain is assumed.  The files */setenv.sh should
  be modified to point to the correct path to the Cortex-M3 GCC toolchain (if
  different from the default in your PATH variable).

  If you have no Cortex-M3 toolchain, one can be downloaded from the NuttX
  SourceForge download site (https://sourceforge.net/project/showfiles.php?group_id=189573).
  This GNU toolchain builds and executes in the Linux or Cygwin environment.

  1. You must have already configured Nuttx in <some-dir>/nuttx.

     cd tools
     ./configure.sh olimex-lpc1766stk/<sub-dir>

  2. Download the latest buildroot package into <some-dir>

  3. unpack the buildroot tarball.  The resulting directory may
     have versioning information on it like buildroot-x.y.z.  If so,
     rename <some-dir>/buildroot-x.y.z to <some-dir>/buildroot.

  4. cd <some-dir>/buildroot

  5. cp configs/cortexm3-defconfig-4.3.3 .config

  6. make oldconfig

  7. make

  8. Edit setenv.h, if necessary, so that the PATH variable includes
     the path to the newly built binaries.

  See the file configs/README.txt in the buildroot source tree.  That has more
  detailed PLUS some special instructions that you will need to follow if you
  are building a Cortex-M3 toolchain for Cygwin under Windows.

  NOTE: This is an OABI toolchain.

LEDs
^^^^

  If CONFIG_ARCH_LEDS is defined, then support for the LPC1766-STK LEDs will be
  included in the build.  See:

  - configs/olimex-lpc1766stk/include/board.h - Defines LED constants, types and
    prototypes the LED interface functions.

  - configs/olimex-lpc1766stk/src/lpc1766stk_internal.h - GPIO settings for the LEDs.

  - configs/olimex-lpc1766stk/src/up_leds.c - LED control logic.

  The LPC1766-STK has two LEDs.  If CONFIG_ARCH_LEDS is defined, these LEDs will
  be controlled as follows for NuttX debug functionality (where NC means "No Change").
  Basically,

  LED1:
  - OFF means that the OS is still initializing. Initialization is very fast so
    if you see this at all, it probably means that the system is hanging up
    somewhere in the initialization phases.
  - ON means that the OS completed initialization.

  LED2:
  - ON/OFF toggles means that various events are happening.
  - GLowing: LED2 is turned on and off on every interrupt so even timer interrupts
    should cause LED2 to glow faintly in the normal case.
  - Flashing. If the LED2 is flashing at about 0.5Hz, that means that a crash
    has occurred.  If CONFIG_ARCH_STACKDUMP=y, you will get some diagnostic
    information on the console to help debug what happened.

  NOTE:  LED2 is controlled by a jumper labeled: ACC_IRQ/LED2.  That jump must be
  in the LED2 position in order to support LED2.

  LED1  LED2      Meaning
  ----- --------  --------------------------------------------------------------------
   OFF   OFF      Still initializing and there is no interrupt activity. 
                  Initialization is very fast so if you see this, it probably means
                  that the system is hung up somewhere in the initialization phases.
   OFF   Glowing  Still initializing (see above) but taking interrupts.
   OFF   ON       This would mean that (1) initialization did not complete but the
                  software is hung, perhaps in an infinite loop, somewhere inside
                  of an interrupt handler.
   OFF   Flashing Ooops!  We crashed before finishing initialization.
 
   ON    OFF      The system has completed initialization, but is apparently not taking
                  any interrupts.
   ON    Glowing  This is the normal healthy state: The OS successfully initialized
                  and is taking interrupts.
   ON    ON       This would mean that (1) the OS complete initialization, but (2)
                  the software is hung, perhaps in an infinite loop, somewhere inside
                  of a signal or interrupt handler.
   ON    Flashing Ooops!  We crashed sometime after initialization.

Using OpenOCD and GDB with an FT2232 JTAG emulator
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  Downloading OpenOCD
  
    You can get information about OpenOCD here: http://openocd.berlios.de/web/
    and you can download it from here. http://sourceforge.net/projects/openocd/files/.
    To get the latest OpenOCD with more mature lpc17xx, you have to download
    from the GIT archive.
    
      git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd

    At present, there is only the older, frozen 0.4.0 version.  These, of course,
    may have changed since I wrote this.
 
  Building OpenOCD under Cygwin:

    You can build OpenOCD for Windows using the Cygwin tools.  Below are a
    few notes that worked as of November 7, 2010.  Things may have changed
    by the time you read this, but perhaps the following will be helpful to
    you:
    
    1. Install Cygwin (http://www.cygwin.com/).  My recommendation is to install
       everything.  There are many tools you will need and it is best just to
       waste a little disk space and have everthing you need.  Everything will
       require a couple of gigbytes of disk space.

    2. Create a directory /home/OpenOCD.

    3. Get the FT2232 drivr from http://www.ftdichip.com/Drivers/D2XX.htm and
       extract it into /home/OpenOCD/ftd2xx

       $ pwd
       /home/OpenOCD
       $ ls
       CDM20802 WHQL Certified.zip
       $ mkdir ftd2xx
       $ cd ftd2xx
       $ unzip ..CDM20802\ WHQL\ Certified.zip 
       Archive:  CDM20802 WHQL Certified.zip
       ...

    3. Get the latest OpenOCD source
    
       $ pwd
       /home/OpenOCD
       $ git clone git://openocd.git.sourceforge.net/gitroot/openocd/openocd
 
       You will then have the source code in /home/OpenOCD/openocd

    4. Build OpenOCD for the FT22322 interface

       $ pwd
       /home/OpenOCD/openocd
       $ ./bootstrap 

       Jim is a tiny version of the Tcl scripting language.  It is needed
       by more recent versions of OpenOCD.  Build libjim.a using the following
       instructions:

       $ git submodule init
       $ git submodule update
       $ cd jimtcl
       $ ./configure --with-jim-ext=nvp
       $ make
       $ make install

       Configure OpenOCD:

       $ ./configure --enable-maintainer-mode --disable-werror --disable-shared \
                    --enable-ft2232_ftd2xx --with-ftd2xx-win32-zipdir=/home/OpenOCD/ftd2xx \
                    LDFLAGS="-L/home/OpenOCD/openocd/jimtcl"

        Then build OpenOCD and its HTML documentation:

        $ make
        $ make html

        The result of the first make will be the "openocd.exe" will be
        created in the folder /home/openocd/src.  The following command
        will install OpenOCD to a standard location (/usr/local/bin)
        using using this command:

        $ make install

  Helper Scripts.

    I have been using the Olimex ARM-USB-OCD JTAG debugger with the
    LPC1766-STK (http://www.olimex.com).  OpenOCD requires a configuration
    file.  I keep the one I used last here:
    
      configs/olimex-lpc1766stk/tools/olimex.cfg

    However, the "correct" configuration script to use with OpenOCD may
    change as the features of OpenOCD evolve.  So you should at least
    compare that olimex.cfg file with configuration files in
    /usr/local/share/openocd/scripts/target (or /home/OpenOCD/openocd/tcl/target).
    As of this writing, there is no script for the lpc1766, but the
    lpc1768 configurtion can be used after changing the flash size to
    256Kb.  That is, change:

      flash bank $_FLASHNAME lpc2000 0x0 0x80000 0 0 $_TARGETNAME ...

    To:
 
      flash bank $_FLASHNAME lpc2000 0x0 0x40000 0 0 $_TARGETNAME ...
    
    There is also a script on the tools/ directory that I use to start
    the OpenOCD daemon on my system called oocd.sh.  That script will
    probably require some modifications to work in another environment:
  
    - Possibly the value of OPENOCD_PATH and TARGET_PATH
    - It assumes that the correct script to use is the one at
      configs/olimex-lpc1766stk/tools/olimex.cfg

  Starting OpenOCD

    Then you should be able to start the OpenOCD daemon like:

      configs/olimex-lpc1766stk/tools/oocd.sh $PWD

    If you use the setenv.sh file, that the path to oocd.sh will be added
    to your PATH environment variabl.  So, in that case, the command simplifies
    to just:

      oocd.sh $PWD

    Where it is assumed that you are executing oocd.sh from the top-level
    directory where NuttX is installed.  $PWD will be the path to the
    top-level NuttX directory.

  Connecting GDB

    Once the OpenOCD daemon has been started, you can connect to it via
    GDB using the following GDB command:

     arm-elf-gdb
     (gdb) target remote localhost:3333

    And you can load the NuttX ELF file:

     (gdb) symbol-file nuttx
     (gdb) load nuttx

    OpenOCD will support several special 'monitor' commands.  These
    GDB commands will send comments to the OpenOCD monitor.  Here
    are a couple that you will need to use:
  
     (gdb) monitor reset
     (gdb) monitor halt

    The MCU must be halted prior to loading code.  Reset will restart
    the processor after loading code.  The 'monitor' command can be
    abbreviated as just 'mon'.

Olimex LPC1766-STK Configuration Options
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

	CONFIG_ARCH - Identifies the arch/ subdirectory.  This should
	   be set to:

	   CONFIG_ARCH=arm

	CONFIG_ARCH_family - For use in C code:

	   CONFIG_ARCH_ARM=y

	CONFIG_ARCH_architecture - For use in C code:

	   CONFIG_ARCH_CORTEXM3=y

	CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory

	   CONFIG_ARCH_CHIP=lpc17xx

	CONFIG_ARCH_CHIP_name - For use in C code to identify the exact
	   chip:

	   CONFIG_ARCH_CHIP_LPC1766=y

	CONFIG_ARCH_BOARD - Identifies the configs subdirectory and
	   hence, the board that supports the particular chip or SoC.

	   CONFIG_ARCH_BOARD=olimex-lpc1766stk (for the Olimex LPC1766-STK)

	CONFIG_ARCH_BOARD_name - For use in C code

	   CONFIG_ARCH_BOARD_LPC1766STK=y

	CONFIG_ARCH_LOOPSPERMSEC - Must be calibrated for correct operation
	   of delay loops

	CONFIG_ENDIAN_BIG - define if big endian (default is little
	   endian)

	CONFIG_DRAM_SIZE - Describes the installed DRAM (CPU SRAM in this case):

	   CONFIG_DRAM_SIZE=(32*1024) (32Kb)

	   There is an additional 32Kb of SRAM in AHB SRAM banks 0 and 1.

	CONFIG_DRAM_START - The start address of installed DRAM

	   CONFIG_DRAM_START=0x10000000

	CONFIG_DRAM_END - Last address+1 of installed RAM

	   CONFIG_DRAM_END=(CONFIG_DRAM_START+CONFIG_DRAM_SIZE)

	CONFIG_ARCH_IRQPRIO - The LPC17xx supports interrupt prioritization

	   CONFIG_ARCH_IRQPRIO=y

	CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to boards that
	   have LEDs

	CONFIG_ARCH_INTERRUPTSTACK - This architecture supports an interrupt
	   stack. If defined, this symbol is the size of the interrupt
	    stack in bytes.  If not defined, the user task stacks will be
	  used during interrupt handling.

	CONFIG_ARCH_STACKDUMP - Do stack dumps after assertions

	CONFIG_ARCH_LEDS -  Use LEDs to show state. Unique to board architecture.

	CONFIG_ARCH_CALIBRATION - Enables some build in instrumentation that
	   cause a 100 second delay during boot-up.  This 100 second delay
	   serves no purpose other than it allows you to calibratre
	   CONFIG_ARCH_LOOPSPERMSEC.  You simply use a stop watch to measure
	   the 100 second delay then adjust CONFIG_ARCH_LOOPSPERMSEC until
	   the delay actually is 100 seconds.

	Individual subsystems can be enabled:
	
	  CONFIG_LPC17_MAINOSC=y
	  CONFIG_LPC17_PLL0=y
	  CONFIG_LPC17_PLL1=n
	  CONFIG_LPC17_ETHERNET=n
	  CONFIG_LPC17_USBHOST=n
	  CONFIG_LPC17_USBOTG=n
	  CONFIG_LPC17_USBDEV=n
	  CONFIG_LPC17_UART0=y
	  CONFIG_LPC17_UART1=n
	  CONFIG_LPC17_UART2=n
	  CONFIG_LPC17_UART3=n
	  CONFIG_LPC17_CAN1=n
	  CONFIG_LPC17_CAN2=n
	  CONFIG_LPC17_SPI=n
	  CONFIG_LPC17_SSP0=n
	  CONFIG_LPC17_SSP1=n
	  CONFIG_LPC17_I2C0=n
	  CONFIG_LPC17_I2C1=n
	  CONFIG_LPC17_I2S=n
	  CONFIG_LPC17_TMR0=n
	  CONFIG_LPC17_TMR1=n
	  CONFIG_LPC17_TMR2=n
	  CONFIG_LPC17_TMR3=n
	  CONFIG_LPC17_RIT=n
	  CONFIG_LPC17_PWM=n
	  CONFIG_LPC17_MCPWM=n
	  CONFIG_LPC17_QEI=n
	  CONFIG_LPC17_RTC=n
	  CONFIG_LPC17_WDT=n
	  CONFIG_LPC17_ADC=n
	  CONFIG_LPC17_DAC=n
	  CONFIG_LPC17_GPDMA=n
	  CONFIG_LPC17_FLASH=n

  LPC17xx specific device driver settings

	CONFIG_UARTn_SERIAL_CONSOLE - selects the UARTn for the
	   console and ttys0 (default is the UART0).
	CONFIG_UARTn_RXBUFSIZE - Characters are buffered as received.
	   This specific the size of the receive buffer
	CONFIG_UARTn_TXBUFSIZE - Characters are buffered before
	   being sent.  This specific the size of the transmit buffer
	CONFIG_UARTn_BAUD - The configure BAUD of the UART.  Must be
	CONFIG_UARTn_BITS - The number of bits.  Must be either 7 or 8.
	CONFIG_UARTn_PARTIY - 0=no parity, 1=odd parity, 2=even parity
	CONFIG_UARTn_2STOP - Two stop bits

  LPC17xx specific PHY/Ethernet device driver settings.  These setting
  also require CONFIG_NET and CONFIG_LPC17_ETHERNET.

	CONFIG_PHY_KS8721 - Selects Micrel KS8721 PHY
	CONFIG_PHY_AUTONEG - Enable auto-negotion
	CONFIG_PHY_SPEED100 - Select 100Mbit vs. 10Mbit speed.
	CONFIG_PHY_FDUPLEX - Select full (vs. half) duplex

	CONFIG_NET_NTXDESC - Configured number of Tx descriptors. Default: 18
	CONFIG_NET_NRXDESC - Configured number of Rx descriptors. Default: 18
	CONFIG_NET_PRIORITY - Ethernet interrupt priority.  The is default is
	  the higest priority.
	CONFIG_NET_WOL - Enable Wake-up on Lan (not fully implemented).
	CONFIG_NET_REGDEBUG - Enabled low level register debug.  Also needs
	  CONFIG_DEBUG.
	CONFIG_NET_DUMPPACKET - Dump all received and transmitted packets.
	  Also needs CONFIG_DEBUG.
	CONFIG_NET_HASH - Enable receipt of near-perfect match frames.
	CONFIG_NET_MULTICAST - Enable receipt of multicast (and unicast) frames.
	  Automatically set if CONFIG_NET_IGMP is selected.

  LPC17xx USB Configuration

	CONFIG_LPC17_USBDEV_FRAME_INTERRUPT
	  Handle USB Start-Of-Frame events. 
	  Enable reading SOF from interrupt handler vs. simply reading on demand.
	  Probably a bad idea... Unless there is some issue with sampling the SOF
	  from hardware asynchronously.
	CONFIG_LPC17_USBDEV_EPFAST_INTERRUPT
	  Enable high priority interrupts.  I have no idea why you might want to
	  do that
	CONFIG_LPC17_USBDEV_NDMADESCRIPTORS
	  Number of DMA descriptors to allocate in SRAM.
	CONFIG_LPC17_USBDEV_DMA
	  Enable lpc17xx-specific DMA support

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

Each Olimex LPC1766-STK configuration is maintained in a
sudirectory and can be selected as follow:

	cd tools
	./configure.sh olimex-lpc1766stk/<subdir>
	cd -
	. ./setenv.sh

Where <subdir> is one of the following:

  nsh:
    Configures the NuttShell (nsh) located at examples/nsh.  The
    Configuration enables only the serial  NSH interfaces.

  ostest:
    This configuration directory, performs a simple OS test using
    examples/ostest.

  usbserial:
    This configuration directory exercises the USB serial class
    driver at examples/usbserial.  See examples/README.txt for
    more information.

  usbstorage:
    This configuration directory exercises the USB mass storage
    class driver at examples/usbstorage.  See examples/README.txt for
    more information.