nuttx/configs/sure-pic32mx
patacongo 86e99bb6cf Add a binary 'loader' so that builtin applications can be executed from the BINFS file system
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5525 42af7a65-404d-4744-a932-0658087f49c3
2013-01-16 19:08:23 +00:00
..
include Updates to support the Mirtoo internal clocking 2012-06-20 19:29:20 +00:00
nsh Add a binary 'loader' so that builtin applications can be executed from the BINFS file system 2013-01-16 19:08:23 +00:00
ostest Don't build drivers/mtd unless CONFIG_MTD is defined (Denis Carikli) 2013-01-15 00:03:58 +00:00
src Missing comma in EVERY DELFILE/DELDIR macro call in every Makefile 2012-11-20 15:47:41 +00:00
usbnsh Add a binary 'loader' so that builtin applications can be executed from the BINFS file system 2013-01-16 19:08:23 +00:00
Kconfig Kconfig: Standardize board LED and button configurations 2012-09-08 03:31:46 +00:00
README.txt Mostly cosmetic changes 2012-11-13 15:50:38 +00:00

configs/pic32mx README
=====================

This README file discusses the port of NuttX to the "Advanced USB Storage
Demo Board," Model DB-DP11215, from Sure Electronics
(http://www.sureelectronics.net/).  This board features the MicroChip
PIC32MX440F512H.  See also http://www.sureelectronics.net/goods.php?id=1168
for further information about the Sure DB-DP11215 board.

DB_DP11215 PIC32 Storage Demo Board

  - PIC32MX44F512H
  - SD card slot
  - RS-2323 Interface
  - USB (MINI-B)
  - 2x16 LCD display
  - Three tactile switches
  - Four user LEDs

Also available (but not yet supported).

DB-DP11212 PIC32 General Purpose Demo Board

  - PIC32MX44F512H
  - LM75A temperature sensor and temperature resistor (NTC-SMD thermistor)
  - SPI FLASH: AT25DF041A
  - USB (MINI-B)
  - 2x16 LCD display
  - 4 digit, 8 segment LED display
  - Three tactile switches
  - Four user LEDs

Contents
========

  PIC32MX440F512H Pin Out
  Toolchains
  Loading NuttX with PICkit2
  PIC32MX Configuration Options
  Configurations

PIC32MX440F512H Pin Out
=======================

  DB_DP11215 PIC32 Storage Demo Board
  -----------------------------------
  PIC32MX440F512H 64-Pin QFN (USB) Pin Out as used on the DB_DP11215 PIC32 Storage
  Demo Board.

  LEFT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
    1  PMD5/RE5                      PMPD5          Display, JP1-12, DB4
    2  PMD6/RE6                      PMPD6          Display, JP1-13, DB6
    3  PMD7/RE7                      PMPD7          Display, JP1-14, DB7
    4  SCK2/PMA5/CN8/RG6             SCK            SD connector SCK, FLASH (U1) SCK*
    5  SDI2/PMA4/CN9/RG7             SDI            SD connector DO, FLASH (U1) SO*
    6  SDO2/PMA3/CN10/RG8            SDO            SD connector DI, FLASH (U1) SI*
    7  MCLR\                         PIC_MCLR       Pulled high, J7-1, ICSP
    8  SS2/PMA2/CN11/RG9             UTIL_CS        FLASH (U1) CS*
    9  Vss                                          Grounded
   10  Vdd                           +3.3V          ---
   11  AN5/C1IN+/Vbuson/CN7/RB5      Vbuson/AN5/RB5 To USB VBUS circuitry
   12  AN4/C1IN-/CN6/RB4             SW_OK          SW3, Pull high, low means SW3 closed
   13  AN3/C2IN+/CN5/RB3             SW_UP          SW1, Pull high, low means SW1 closed
   14  AN2/C2IN-/CN4/RB2             SW_Down        SW2, Pull high, low means SW2 closed
   15  PGEC1/AN1/Vref-/CVref-/CN3/   ADC_SENSE_SWITCHED_+VBUS To USB VBUS circuitry
       RB1
   16  PGED1/AN0/VREF+/CVREF+/PMA6/                     N/C            Not connected
       CN2/RB0

  *FLASH (U1, SOIC) not populated

  BOTTOM SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   17  PGEC2/AN6/OCFA/RB6            PIC_PGC2       J7-5, ICSP
   18  PGED2/AN7/RB7                 PIC_PGD2       J7-4, ICSP
   19  AVdd                          +3.3V          ---
   20  AVss                                         Grounded
   21  AN8/U2CTS/C1OUT/RB8           N/C            Not connected
   22  AN9/C2OUT/PMA7/RB9            N/C            Not connected
   23  TMS/AN10/CVREFOUT/PMA13/RB10  UTIL_WP        FLASH (U1) WP*
   24  TDO/AN11/PMA12/RB11           SD_CS          SD connector CS
   25  Vss                                          Grounded
   26  Vdd                           +3.3V          ---
   27  TCK/AN12/PMA11/RB12           SD_CD          SD connector CD
   28  TDI/AN13/PMA10/RB13           SD_WD          SD connector WD
   29  AN14/U2RTS/PMALH/PMA1/RB14    N/C            Not connected
   30  AN15/OCFB/PMALL/PMA0/CN12/    PMPA0          Display, JP1-4, RS
       RB15
   31  SDA2/U2RX/PMA9/CN17/RF4       RXD2_MCU       J5 DB9 via RS232 driver
   32  SCL2/U2TX/PMA8/CN18/RF5       TXD2_MCU       J5 DB9 via RS232 driver

  *FLASH (U1, SOIC) not populated

  RIGHT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   48  SOSCO/T1CK/CN0/RC14           SOSCO          32.768KHz XTAL (Y1)
   47  SOSCI/CN1/RC13                SOSCI          32.768KHz XTAL (Y1)
   46  OC1/INT0/RD0                  PWM1           Used to control backlight level (K)
   45  IC4/PMCS1/PMA14/INT4/RD11     PMPCS1         Display, JP1-6, E
   44  SCL1/IC3/PMCS2/PMA15/INT3/    USB_OPT        USB PHY
       RD10
   43  U1CTS/SDA1/IC2/INT2/RD9       USB_OPTEN      USB PHY
   42  RTCC/IC1/INT1/RD8             N/C            Not connected
   41  Vss                                          Grounded
   40  OSC2/CLKO/RC15                OSC2           20MHz XTAL (Y2)
   39  OSC1/CLKI/RC12                OSC1           20MHz XTAL (Y2)
   38  Vdd                           +3.3V          ---
   37  D+/RG2                        APPS_D+        USB connectors via PHY
   36  D-/RG3                        APPS_D-        USB connectors via PHY
   35  Vusb                          +3.3V          ---
   34  Vbus                          VBUS_DEVICE_MODE Display, USB Mini-B, USB Type A, JP1-1, +5V
   33  USBID/RF3                     N/C            Not connected

  TOP SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   64  PMPD4/RE4                     PMPD4          Display, JP1-11, DB4
   63  PMPD3/RE3                     PMPD3          Display, JP1-10, DB3
   62  PMPD2/RE2                     PMPD2          Display, JP1-9, DB2
   61  PMPD1/RE1                     PMPD1          Display, JP1-8, DB1
   60  PMPD0/RE0                     PMPD0          Display, JP1-7, DB0
   59  RF1                           RF1            Low illuminates LED/R/ERR
   58  RF0                           RF0            Low illuminates LED/Y/flash
   57  ENVREG                        ENVREG         Pulled high
   56  Vcap/Vddcore                  VDDCORE        Capactors to ground
   55  CN16/RD7                      RD7            Low illuminates LED/Y/USB
   54  CN15/RD6                      RD6            Low illuminates LED/Y/SD
   53  PMRD/CN14/RD5                 PMPRD          Display, JP1-5, R/W
   52  OC5/IC5/PMWR/CN13/RD4         N/C            Not connected
   51  U1TX/OC4/RD3                  CP2102_RXD     J6-3, UART1 (also CP2102*)
   50  U1RX/OC3/RD2                  CP2102_TXD     J6-2, UART1 (also CP2102*)
   49  U1RTS/OC2/RD1                 PWM2           Used to control backlight level (Vo)

  *USB-to-UART bridge (U1, CP2102) not populated

  DB-DP11212 PIC32 General Purpose Demo Board
  -------------------------------------------
  PIC32MX440F512H 64-Pin QFN (USB) Pin Out as used on the DB-DP11212 PIC32 General
  Purpose Demo Board

  LEFT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
    1  PMD5/RE5                      PMPD5          Display, JP1-12, DB5
    2  PMD6/RE6                      PMPD6          Display, JP1-13, DB6
    3  PMD7/RE7                      PMPD7          Display, JP1-14, DB7
    4  SCK2/PMA5/CN8/RG6             SCK            FLASH (U4) SCK*
    5  SDI2/PMA4/CN9/RG7             SDI            FLASH (U4) SO*
    6  SDO2/PMA3/CN10/RG8            SDO            FLASH (U4) SI*
    7  MCLR\                         PIC_MCLR       Pulled high, J2-1, ICSP
    8  SS2/PMA2/CN11/RG9             N/C            Not connected
    9  Vss                                          Grounded
   10  Vdd                           +3.3V          ---
   11  Vbuson/AN5/CN7/RB5            RB5            LCD SEG5 (F), U5-10
   12  AN4/CN6/RB4                   RB4            LCD SEG4 (E), U5-1
   13  AN3/CN5/RB3                   RB3            LCD SEG3 (D), U5-2
   14  AN2/CN4/RB2                   RB2            LCD SEG2 (C), U5-4
   15  PGEC1/AN1/Vref-/CN3/RB1       RB1            LCD SEG1 (B), U5-7
   16  PGED1/AN0/VREF+/CVREF+/PMA6/  RB0            LCD SEG0 (A), U5-11
       CN2/RB0

  *FLASH (U4, SOIC) not populated

  BOTTOM SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   17  PGEC2/AN6/OCFA/RB6            PIC_PGC2       J2-5, ICSP
   18  PGED2/AN7/RB7                 PIC_PGD2       J2-4, ICSP
   19  AVdd                          +3.3V          ---
   20  AVss                                         Grounded
   21  AN8/U2CTS/RB8                 RB8            LCD SEG6 (G), U5-5
   22  AN9/PMA7/RB9                  RB9            LCD SEG7 (DP), U5-3
   23  TMS/AN10/PMA13/RB10           UTIL_WP        FLASH (U4) WP*
   24  TDO/AN11/PMA12/RB11           UTIL_CS        FLASH (U4) CS*
   25  Vss                                          Grounded
   26  Vdd                           +3.3V          ---
   27  TCK/AN12/PMA11/RB12           N/C            Not connected
   28  TDI/AN13/PMA10/RB13           N/C            Not connected
   29  AN14/U2RTS/PMA1/RB14          temp_AD        temp_AD
   30  AN15/PMA0/CN12/RB15           PMPA0          Display, JP1-4, RS
   31  SDA2/U2RX/PMA9/CN17/RF4       SDA            LM75/SO, U3-1, SDA
   32  SCL2/U2TX/PMA8/CN18/RF5       SCL            LM75/SO, U3-2, SCL

  *FLASH (U4, SOIC) not populated

  RIGHT SIDE, TOP-TO-BOTTOM (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   48  SOSCO/T1CK/CN0/RC14           SOSCO          32.768KHz XTAL (Y1)
   47  SOSCI/CN1/RC13                SOSCI          32.768KHz XTAL (Y1)
   46  OC1/INT0/RD0                  RD0            LCD DIG1, U5-12
   45  IC4/PMCS1/PMA14/RD11          PMCS1          Display, JP1-6, E
   44  SCL1/PMCS2/PMA15              RD10           LCD DIG2, U5-9
   43  SDA1/RD9                      RD9            LCD DIG3, U5-8
   42  RTCC/RD8                      RD8            LCD DIG4, U5-6
   41  Vss                                          Grounded
   40  OSC2/CLKO/RC15                OSC2           20MHz XTAL (Y2)
   39  OSC1/CLKI/RC12                OSC1           20MHz XTAL (Y2)
   38  Vdd                           +3.3V          ---
   37  D+                            MCU_D+         USB connectors via PHY
   36  D-                            MCU_D-         USB connectors via PHY
   35  Vusb                          +3.3V          ---
   34  Vbus                          +5V_DUSB       Display, USB Mini-B, USB Type A, JP1-1, +5V
   33  USBID/RF3                     N/C            Not connected

  TOP SIDE, LEFT-TO-RIGHT (if pin 1 is in upper left)
  PIN  NAME                          SIGNAL         NOTES
  ---- ----------------------------- -------------- -------------------------------
   64  PMPD4/RD4                     PMPD4          Display, JP1-11, DB4
   63  PMPD3/RD3                     PMPD3          Display, JP1-10, DB3
   62  PMPD2/RD2                     PMPD2          Display, JP1-9, DB2
   61  PMPD1/RD1                     PMPD1          Display, JP1-8, DB1
   60  PMPD0/RE0                     PMPD0          Display, JP1-7, DB0
   59  RF1                           Key3           SW3-1
   58  RF0                           Key2           SW2-1
   57  ENVREG                        ENVREG         Pulled high
   56  Vcap/Vddcore                  VDDCORE        Capacitors to ground
   55  CN16/RD7                      N/C            Not connected
   54  CN15/RD6                      Key5           SW5-1
   53  PMRD/CN14/RD5                 PMPRD          ---
   52  OC5/PMWR/CN13/RD4             PWM2           Used to control backlight level (Vo)
   51  U1TX/OC4/RD3                  N/C            Not connected
   50  U1RX/OC3/RD2                  N/C            Not connected
   49  OC2/RD1                       PWM1           Used to control backlight level (K)

Toolchains
==========

  MPLAB/C32
  ---------

  I am using the free, "Lite" version of the PIC32MX toolchain available
  for download from the microchip.com web site.  I am using the Windows
  version.  The MicroChip toolchain is the only toolchain currently
  supported in these configurations, but it should be a simple matter to
  adapt to other toolchains by modifying the Make.defs file include in
  each configuration.

  C32 Toolchain Options:

    CONFIG_PIC32MX_MICROCHIPW      - MicroChip full toolchain for Windows
    CONFIG_PIC32MX_MICROCHIPL      - MicroChip full toolchain for Linux
    CONFIG_PIC32MX_MICROCHIPW_LITE - MicroChip "Lite" toolchain for Windows
    CONFIG_PIC32MX_MICROCHIPL_LITE - MicroChip "Lite" toolchain for Linux

  NOTE:  The "Lite" versions of the toolchain does not support C++.  Also
  certain optimization levels are not supported by the "Lite" toolchain.

  MicrochipOpen
  -------------

  An alternative, build-it-yourself toolchain is available here:
  http://sourceforge.net/projects/microchipopen/ .  These tools were
  last updated circa 2010.  NOTE:  C++ support still not available
  in this toolchain.

  Building MicrochipOpen (on Linux)

  1) Get the build script from this location:

      http://microchipopen.svn.sourceforge.net/viewvc/microchipopen/ccompiler4pic32/buildscripts/trunk/

  2) Build the code using the build script, for example:

      ./build.sh -b v105_freeze

     This will check out the selected branch and build the tools.

  3) Binaries will then be available in a subdirectory with a name something like
     pic32-v105-freeze-20120622/install-image/bin (depending on the current data
     and the branch that you selected.

     Note that the tools will have the prefix, mypic32- so, for example, the
     compiler will be called mypic32-gcc.

  Penguino mips-elf Toolchain
  ---------------------------

  Another option is the mips-elf toolchain used with the Penguino project.  This
  is a relatively current mips-elf GCC and should provide free C++ support as
  well. This toolchain can be downloded from the Penguino website:
  http://wiki.pinguino.cc/index.php/Main_Page#Download . There is some general
  information about using the Penguino mips-elf toolchain in this thread:
  http://tech.groups.yahoo.com/group/nuttx/message/1821

  See also configs/mirtoo/README.txt.  There is an experimental (untested)
  configuration for the Mirtoo platform in that directory.

  MPLAB/C32 vs MPLABX/X32
  -----------------------

  It appears that Microchip is phasing out the MPLAB/C32 toolchain and replacing
  it with MPLABX and XC32.  At present, the XC32 toolchain is *not* compatible
  with the NuttX build scripts.  Here are some of the issues that I see when trying
  to build with XC32:

  1) Make.def changes:  You have to change the tool prefix:

     CROSSDEV=xc32-

  2) debug.ld/release.ld:  The like expect some things that are not present in
     the current linker scripts (or are expected with different names).  Here
     are some partial fixes:

     Rename:  kseg0_progmem to kseg0_program_mem
     Rename:  kseg1_datamem to kseg1_data_mem

  Even then, there are more warnings from the linker and some undefined symbols
  for non-NuttX code that resides in the unused Microchip libraries.  See this
  email thread at http://tech.groups.yahoo.com/group/nuttx/message/1458 for more
  information.  You will have to solve at least this undefined symbol problem if
  you want to used the XC32 toolchain.

  Windows Native Toolchains
  -------------------------
  
  NOTE:  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 no 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.

       MKDEP                = $(TOPDIR)/tools/mknulldeps.sh

Loading NuttX with PICkit2
==========================

  NOTE:  You need a PICKit3 if you plan to use the MPLAB debugger!  The PICKit2
  can, however, still be used to load programs.  Instructions for the PICKit3
  are similar.

  Intel Hex Forma Files:
  ----------------------

    When NuttX is built it will produce two files in the top-level NuttX
    directory:

    1) nuttx - This is an ELF file, and
    2) nuttx.hex - This is an Intel Hex format file.  This is controlled by
       the setting CONFIG_INTELHEX_BINARY in the .config file.

    The PICkit tool wants an Intel Hex format file to burn into FLASH. However,
    there is a problem with the generated nutt.hex: The tool expects the nuttx.hex
    file to contain physical addresses.  But the nuttx.hex file generated from the
    top-level make will have address in the KSEG0 and KSEG1 regions.

  tools/pic32mx/mkpichex:
  ----------------------

    There is a simple tool in the NuttX tools/pic32mx directory that can be
    used to solve both issues with the nuttx.hex file.  But, first, you must
    build the tool:

      cd tools/pic32mx
      make

    Now you will have an excecutable file call mkpichex (or mkpichex.exe on
    Cygwin).  This program will take the nutt.hex file as an input, it will
    convert all of the KSEG0 and KSEG1 addresses to physical address, and
    it will write the modified file, replacing the original nuttx.hex.

    To use this file, you need to do the following things:

      . ./setenv.sh    # Source setenv.sh.  Among other this, this script
                       # will add the NuttX tools/pic32mx directory to your
                       # PATH variable
      make             # Build nuttx and nuttx.hex
      mkpichex $PWD    # Convert addresses in nuttx.hex.  $PWD is the path
                       # to the top-level build directory.  It is the only
                       # required input to mkpichex.

PIC32MX Configuration Options
=============================

  General Architecture Settings:

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

       CONFIG_ARCH=mips

    CONFIG_ARCH_family - For use in C code:

       CONFIG_ARCH_MIPS=y

    CONFIG_ARCH_architecture - For use in C code:

       CONFIG_ARCH_MIPS32=y

    CONFIG_ARCH_CHIP - Identifies the arch/*/chip subdirectory

       CONFIG_ARCH_CHIP=pic32mx

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

       CONFIG_ARCH_CHIP_PIC32MX440F512H=y

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

       CONFIG_ARCH_BOARD=sure-pic32mx

    CONFIG_ARCH_DBDP11215 Distinguishes the DB_DP11215 PIC32 Storage 
      Demo Board

    CONFIG_ARCH_DBDP11212 Distingustes the DB-DP11212 PIC32 General
      Purpose Demo Board

    CONFIG_ARCH_BOARD_name - For use in C code

       CONFIG_ARCH_BOARD_SUREPIC32MX=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=0xa0000000

    CONFIG_ARCH_IRQPRIO - The PIC32MXx 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.

    PIC32MX Configuration

      CONFIG_PIC32MX_MVEC - Select muli- vs. single-vectored interrupts

    Individual subsystems can be enabled:

       CONFIG_PIC32MX_WDT            - Watchdog timer
       CONFIG_PIC32MX_T2             - Timer 2 (Timer 1 is the system time and always enabled)
       CONFIG_PIC32MX_T3             - Timer 3
       CONFIG_PIC32MX_T4             - Timer 4
       CONFIG_PIC32MX_T5             - Timer 5
       CONFIG_PIC32MX_IC1            - Input Capture 1
       CONFIG_PIC32MX_IC2            - Input Capture 2
       CONFIG_PIC32MX_IC3            - Input Capture 3
       CONFIG_PIC32MX_IC4            - Input Capture 4
       CONFIG_PIC32MX_IC5            - Input Capture 5
       CONFIG_PIC32MX_OC1            - Output Compare 1
       CONFIG_PIC32MX_OC2            - Output Compare 2
       CONFIG_PIC32MX_OC3            - Output Compare 3
       CONFIG_PIC32MX_OC4            - Output Compare 4
       CONFIG_PIC32MX_OC5            - Output Compare 5
       CONFIG_PIC32MX_I2C1           - I2C 1
       CONFIG_PIC32MX_I2C2           - I2C 2
       CONFIG_PIC32MX_SPI2           - SPI 2
       CONFIG_PIC32MX_UART1          - UART 1
       CONFIG_PIC32MX_UART2          - UART 2
       CONFIG_PIC32MX_ADC            - ADC 1
       CONFIG_PIC32MX_PMP            - Parallel Master Port
       CONFIG_PIC32MX_CM1            - Comparator 1
       CONFIG_PIC32MX_CM2            - Comparator 2
       CONFIG_PIC32MX_RTCC           - Real-Time Clock and Calendar
       CONFIG_PIC32MX_DMA            - DMA
       CONFIG_PIC32MX_FLASH          - FLASH
       CONFIG_PIC32MX_USBDEV         - USB device
       CONFIG_PIC32MX_USBHOST        - USB host

    PIC32MX Configuration Settings
    DEVCFG0:
      CONFIG_PIC32MX_DEBUGGER - Background Debugger Enable. Default 3 (disabled). The
        value 2 enables.
      CONFIG_PIC32MX_ICESEL - In-Circuit Emulator/Debugger Communication Channel Select
        Default 1 (PG2)
      CONFIG_PIC32MX_PROGFLASHWP  - Program FLASH write protect.  Default 0xff (disabled)
      CONFIG_PIC32MX_BOOTFLASHWP - Default 1 (disabled)
      CONFIG_PIC32MX_CODEWP - Default 1 (disabled)
    DEVCFG1: (All settings determined by selections in board.h)
    DEVCFG2: (All settings determined by selections in board.h)
    DEVCFG3: 
      CONFIG_PIC32MX_USBIDO - USB USBID Selection.  Default 1 if USB enabled
        (USBID pin is controlled by the USB module), but 0 (GPIO) otherwise.
      CONFIG_PIC32MX_VBUSIO - USB VBUSON Selection (Default 1 if USB enabled
        (VBUSON pin is controlled by the USB module, but 0 (GPIO) otherwise.
      CONFIG_PIC32MX_WDENABLE - Enabled watchdog on power up.  Default 0 (watchdog
        can be enabled later by software).

    The priority of interrupts may be specified.  The value ranage of
    priority is 4-31. The default (16) will be used if these any of these
    are undefined.

       CONFIG_PIC32MX_CTPRIO         - Core Timer Interrupt
       CONFIG_PIC32MX_CS0PRIO        - Core Software Interrupt 0
       CONFIG_PIC32MX_CS1PRIO        - Core Software Interrupt 1
       CONFIG_PIC32MX_INT0PRIO       - External Interrupt 0
       CONFIG_PIC32MX_INT1PRIO       - External Interrupt 1
       CONFIG_PIC32MX_INT2PRIO       - External Interrupt 2
       CONFIG_PIC32MX_INT3PRIO       - External Interrupt 3
       CONFIG_PIC32MX_INT4PRIO       - External Interrupt 4
       CONFIG_PIC32MX_FSCMPRIO       - Fail-Safe Clock Monitor
       CONFIG_PIC32MX_T1PRIO         - Timer 1 (System timer) priority
       CONFIG_PIC32MX_T2PRIO         - Timer 2 priority
       CONFIG_PIC32MX_T3PRIO         - Timer 3 priority
       CONFIG_PIC32MX_T4PRIO         - Timer 4 priority
       CONFIG_PIC32MX_T5PRIO         - Timer 5 priority
       CONFIG_PIC32MX_IC1PRIO        - Input Capture 1
       CONFIG_PIC32MX_IC2PRIO        - Input Capture 2
       CONFIG_PIC32MX_IC3PRIO        - Input Capture 3
       CONFIG_PIC32MX_IC4PRIO        - Input Capture 4
       CONFIG_PIC32MX_IC5PRIO        - Input Capture 5
       CONFIG_PIC32MX_OC1PRIO        - Output Compare 1
       CONFIG_PIC32MX_OC2PRIO        - Output Compare 2
       CONFIG_PIC32MX_OC3PRIO        - Output Compare 3
       CONFIG_PIC32MX_OC4PRIO        - Output Compare 4
       CONFIG_PIC32MX_OC5PRIO        - Output Compare 5
       CONFIG_PIC32MX_I2C1PRIO       - I2C 1
       CONFIG_PIC32MX_I2C2PRIO       - I2C 2
       CONFIG_PIC32MX_SPI2PRIO       - SPI 2
       CONFIG_PIC32MX_UART1PRIO      - UART 1
       CONFIG_PIC32MX_UART2PRIO      - UART 2
       CONFIG_PIC32MX_CN             - Input Change Interrupt
       CONFIG_PIC32MX_ADCPRIO        - ADC1 Convert Done
       CONFIG_PIC32MX_PMPPRIO        - Parallel Master Port
       CONFIG_PIC32MX_CM1PRIO        - Comparator 1
       CONFIG_PIC32MX_CM2PRIO        - Comparator 2
       CONFIG_PIC32MX_FSCMPRIO       - Fail-Safe Clock Monitor
       CONFIG_PIC32MX_RTCCPRIO       - Real-Time Clock and Calendar
       CONFIG_PIC32MX_DMA0PRIO       - DMA Channel 0
       CONFIG_PIC32MX_DMA1PRIO       - DMA Channel 1
       CONFIG_PIC32MX_DMA2PRIO       - DMA Channel 2
       CONFIG_PIC32MX_DMA3PRIO       - DMA Channel 3
       CONFIG_PIC32MX_FCEPRIO        - Flash Control Event
       CONFIG_PIC32MX_USBPRIO        - USB

  PIC32MXx specific device driver settings.  NOTE:  For the Sure board,
  UART2 is brought out to the DB9 connector and serves as the serial
  console.

    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

  PIC32MXx USB Device Configuration

  PIC32MXx USB Host Configuration (the PIC32MX does not support USB Host)

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

Each PIC32MX configuration is maintained in a sudirectory and can be
selected as follow:

    cd tools
    ./configure.sh sure-pic32mx/<subdir>
    cd -
    . ./setenv.sh

Where <subdir> is one of the following:

  ostest:
  =======
    Description.
    ------------
    This configuration directory, performs a simple OS test using
    apps/examples/ostest.

  nsh:
  ====
    Description.
    ------------
    Configures the NuttShell (nsh) located at apps/examples/nsh.  The
    Configuration enables only the serial NSH interface.

    USB Configuations.
    -----------------
    Several USB device configurations can be enabled and included
    as NSH built-in built in functions.  All require the following
    basic setup in your .config to enable USB device support:
 
      CONFIG_USBDEV=y         : Enable basic USB device support
      CONFIG_PIC32MX_USBDEV=y : Enable PIC32 USB device support

    examples/usbterm - This option can be enabled by uncommenting
    the following line in the appconfig file:

      CONFIGURED_APPS += examples/usbterm

    And by enabling one of the USB serial devices:

      CONFIG_PL2303=y         : Enable the Prolifics PL2303 emulation
      CONFIG_CDCACM=y         : or the CDC/ACM serial driver (not both)

    examples/cdcacm -  The examples/cdcacm program can be included as an 
    function by uncommenting the following line in the appconfig file:
    
      CONFIGURED_APPS += examples/cdcacm

    and defining the following in your .config file:

      CONFIG_CDCACM=y         : Enable the CDCACM device

    examples/usbstorage - There are some hooks in the appconfig file
    to enable the USB mass storage device.  However, this device cannot
    work until support for the SD card is also incorporated.

    SD Card Support.
    ----------------
    Support for the on-board, SPI-based SD card is available but is
    not yet functional (at least at the time of this writing).  SD
    card support can be enabled for testing by simply enabling SPI2
    support in the configuration file:

      -CONFIG_PIC32MX_SPI2=n
      +CONFIG_PIC32MX_SPI2=y

    Debug output for testing the SD card can be enabled using:

      -CONFIG_DEBUG_FS=n
      -CONFIG_DEBUG_SPI=n
      +CONFIG_DEBUG_FS=y
      +CONFIG_DEBUG_SPI=y

  usbnsh:
  =======
    Description.
    ------------
    This is another NSH example.  If differs from the 'nsh' configuration
    above in that this configurations uses a USB serial device for console
    I/O.  This configuration was created to support the "DB-DP11212 PIC32
    General Purpose Demo Board" which has no easily accessible serial port.
    However, as of this writing, the configuration has set for the
    "DB_DP11215 PIC32 Storage Demo Board" and has only be testing on that
    board.

    Comparison to nsh
    -----------------
    Below summarizes the key configuration differences between the 'nsh'
    and the 'upnsh' configurations:

      CONFIG_USBDEV=y               : NuttX USB device support is enabled
      CONFIG_PIC32MX_USBDEV=y       : The PIC32MX USB device driver is built
      CONFIG_UART1_SERIAL_CONSOLE=n : There is no serial console
      CONFIG_UART2_SERIAL_CONSOLE=n :
      CONFIG_CDCACM=y               : The CDC/ACM serial device class is enabled
      CONFIG_CDCACM_CONSOLE=y       : The CDC/ACM serial device is the console

    Using the Prolifics PL2303 Emulation
    ------------------------------------
    You could also use the non-standard PL2303 serial device instead of
    the standard CDC/ACM serial device by changing:

      CONFIG_CDCACM=y               : Disable the CDC/ACM serial device class
      CONFIG_CDCACM_CONSOLE=y       : The CDC/ACM serial device is NOT the console
      CONFIG_PL2303=y               : The Prolifics PL2303 emulation is enabled
      CONFIG_PL2303_CONSOLE=y       : The PL2303 serial device is the console

    Why would you want to use a non-standard USB serial driver?  You might
    to use the PL2303 driver with a Windows host because it should
    automatically install the PL2303 driver (you might have to go through
    some effort to get Windows to recognize the CDC/ACM device).