Completes coding of the PWM module

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4200 7fd9a85b-ad96-42d3-883c-3090e2eb8679

12 files changed, 1182 insertions, 0 deletions

diff --git a/nuttx/configs/pjrc-8051/Make.defs b/nuttx/configs/pjrc-8051/Make.defs
new file mode 100644
index 000000000..68de71650
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/Make.defs
@@ -0,0 +1,97 @@
+############################################################################
+# configs/pjrc-8051/Make.defs
+#
+#   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+include ${TOPDIR}/.config
+
+ifeq ("${CONFIG_DEBUG_SYMBOLS}","y")
+  ARCHOPTIMIZATION	= --debug
+else
+  ARCHOPTIMIZATION	=
+endif
+
+ARCHCPUFLAGS		= -mmcs51 --stack-auto --model-large --int-long-reent --float-reent
+ARCHPICFLAGS		=
+ARCHWARNINGS		=
+ARCHDEFINES		=
+ARCHINCLUDES		= -I. -I$(TOPDIR)/include
+
+CROSSDEV		=
+CC			= sdcc
+CPP			= sdcpp
+LD			= aslink
+AS			= asx8051
+AR			= sdcclib -a
+
+CFLAGS			= $(ARCHWARNINGS) $(ARCHOPTIMIZATION) \
+			  $(ARCHCPUFLAGS) $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+CPPFLAGS		= $(ARCHINCLUDES) $(ARCHDEFINES) $(EXTRADEFINES)
+
+ASMEXT			= .asm
+OBJEXT			= .rel
+LIBEXT			= .lib
+EXEEXT			= .hex
+
+define PREPROCESS
+	@echo "CPP: $1->$2"
+	@$(CPP) $(CPPFLAGS) $1 -o $2
+endef
+
+define COMPILE
+	@echo "CC: $1"
+	@$(CC) -c $(CFLAGS) $1 -o $2
+endef
+
+define ASSEMBLE
+	@echo "AS: $1"
+	@$(AS) $(ASFLAGS) $1
+endef
+
+define ARCHIVE
+	echo "AR: $2"; \
+	$(AR) $1 $2 || { echo "$(AR) $1 $2 FAILED!" ; exit 1 ; }
+endef
+
+define CLEAN
+	@rm -f *.asm *.rel *.lst *.rst *.sym *.adb *.lnk *.map *.mem *.ihx *.hex
+endef
+
+MKDEP			= $(TOPDIR)/tools/mkdeps.sh
+
+HOSTCC			= gcc
+HOSTINCLUDES		= -I.
+HOSTCFLAGS		= -Wall -wstrict-prototypes -Wshadow -g -pipe
+HOSTLDFLAGS		=
+
+
diff --git a/nuttx/configs/pjrc-8051/README.txt b/nuttx/configs/pjrc-8051/README.txt
new file mode 100644
index 000000000..dae92b59b
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/README.txt
@@ -0,0 +1,37 @@
+pjrc-8051 README
+^^^^^^^^^^^^^^^^
+
+This port uses the PJRC 87C52 development system and the SDCC toolchain.
+
+The PJRC 87C52 development system can be obtained from http://www.pjrc.com/.
+
+The SDCC toolchain is available from http://sdcc.sourceforge.net/.  All
+testing has been performed using verison 2.6.0 of the SDDC toolchain.
+
+Building the SDCC toolchain
+^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+The SDCC toolchain is built with the standard configure/make/make install
+sequence.  However, some special actions are required to generate libraries
+compatible with this build.  First start with the usual steps
+
+  download
+  unpack
+  cd sdcc
+  ./configure
+  make
+
+But before installing, we need to apply a patch to the SDCC 2.6.0 source.
+WARNING:  This patch is specific to the particular combination of CFLAGS
+that are used in the compilation.  If you change Make.defs, then you will
+likely have to change the patch as well.
+
+  Apply sdcc-2.6.0.patch
+  cd sdcc/device/lib
+  make model-mcs51-stack-auto
+
+Then
+
+  cd sdcc
+  make install
+
diff --git a/nuttx/configs/pjrc-8051/appconfig b/nuttx/configs/pjrc-8051/appconfig
new file mode 100644
index 000000000..d88edca75
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/appconfig
@@ -0,0 +1,39 @@
+############################################################################
+# configs/pjrc-8051/appconfig
+#
+#   Copyright (C) 2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+# Path to example in apps/examples containing the user_start entry point
+
+CONFIGURED_APPS += examples/ostest
+
diff --git a/nuttx/configs/pjrc-8051/defconfig b/nuttx/configs/pjrc-8051/defconfig
new file mode 100644
index 000000000..32341becb
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/defconfig
@@ -0,0 +1,385 @@
+############################################################################
+# configs/pjrc-8051/defconfig
+#
+#   Copyright (C) 2007-2011 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+#
+# Architecture selection
+#
+# CONFIG_ARCH - identifies the arch subdirectory and, hence, the
+#   processor architecture.
+# CONFIG_ARCH_8051 - Set if processor is 8051 family
+# CONFIG_ARCH_8052 = Set if processor is 8052 family
+# CONFIG_ARCH_BOARD - identifies the configs subdirectory and, hence,
+#   the board that supports the particular chip or SoC.
+# CONFIG_ARCH_BOARD_name - for use in C code
+# CONFIG_ENDIAN_BIG - define if big endian (default is little endian)
+#
+CONFIG_ARCH=8051
+CONFIG_ARCH_8051=n
+CONFIG_ARCH_8052=y
+CONFIG_ARCH_BOARD=pjrc-8051
+CONFIG_ARCH_BOARD_PJRC_87C52=y
+
+#
+# Architecture-specific settings.  These may mean nothing to
+# other architectures.
+#
+# CONFIG-ARCH_PJRC - Set if using the PJRC 87C52 board
+# CONFIG_ARCH_LEDS - Use LEDs to show state. Unique to 8051.
+# CONFIG_8052_TIMER2 - Use timer2 for the 100Hz system timer.
+#   (default is timer0 at 112.5Hz).
+#
+# These features are only supported when CONFIG_ARCH_BRINGUP
+# is set:
+#
+# CONFIG_ARCH_BRINGUP - Enables some bringup features
+# CONFIG_FRAME_DUMP - Enable stack/frame dumping logic
+# CONFIG_FRAME_DUMP_SHORT - Terse frame dump output
+# CONFIG_SUPPRESS_INTERRUPTS - Do not enable interrupts
+# CONFIG_SWITCH_FRAME_DUMP - Dump frames from normal switches
+# CONFIG_INTERRUPT_FRAME_DUMP - Dump frames from interrupt switches
+# CONFIG_LED_DEBUG - Enable debug output from LED logic
+#
+CONFIG_ARCH_PJRC=y
+CONFIG_ARCH_LEDS=y
+CONFIG_8052_TIMER2=y
+
+CONFIG_ARCH_BRINGUP=y
+CONFIG_FRAME_DUMP=n
+CONFIG_FRAME_DUMP_SHORT=n
+CONFIG_SUPPRESS_INTERRUPTS=y
+CONFIG_SWITCH_FRAME_DUMP=n
+CONFIG_INTERRUPT_FRAME_DUMP=n
+CONFIG_LED_DEBUG=n
+
+#
+# General build options
+#
+# CONFIG_RRLOAD_BINARY - make the rrload binary format used with
+#   BSPs from www.ridgerun.com using the tools/mkimage.sh script
+# CONFIG_INTELHEX_BINARY - make the Intel HEX binary format
+#   used with many different loaders using the GNU objcopy program
+#   Should not be selected if you are not using the GNU toolchain.
+# CONFIG_RAW_BINARY - make a raw binary format file used with many
+#   different loaders using the GNU objcopy program.  This option
+#   should not be selected if you are not using the GNU toolchain.
+# CONFIG_HAVE_LIBM - toolchain supports libm.a
+#
+CONFIG_RRLOAD_BINARY=n
+CONFIG_INTELHEX_BINARY=n
+CONFIG_RAW_BINARY=n
+CONFIG_HAVE_LIBM=n
+
+#
+# General OS setup
+#
+# CONFIG_APPS_DIR - Identifies the relative path to the directory
+#   that builds the application to link with NuttX.  Default: ../apps
+# CONFIG_DEBUG - enables built-in debug options
+# CONFIG_DEBUG_VERBOSE - enables verbose debug output
+# CONFIG_DEBUG_SYMBOLS - build without optimization and with
+#   debug symbols (needed for use with a debugger).
+# CONFIG_MM_REGIONS - If the architecture includes multiple
+#   regions of memory to allocate from, this specifies the
+#   number of memory regions that the memory manager must
+#   handle and enables the API mm_addregion(start, end);
+# CONFIG_ARCH_LOWPUTC - architecture supports low-level, boot
+#   time console output
+# CONFIG_MSEC_PER_TICK - The default system timer is 100Hz
+#   or MSEC_PER_TICK=10.  This setting may be defined to
+#   inform NuttX that the processor hardware is providing
+#   system timer interrupts at some interrupt interval other
+#   than 10 msec.
+# CONFIG_RR_INTERVAL - The round robin timeslice will be set
+#   this number of milliseconds;  Round robin scheduling can
+#   be disabled by setting this value to zero.
+# CONFIG_SCHED_INSTRUMENTATION - enables instrumentation in 
+#   scheduler to monitor system performance
+# CONFIG_TASK_NAME_SIZE - Spcifies that maximum size of a
+#   task name to save in the TCB.  Useful if scheduler
+#   instrumentation is selected.  Set to zero to disable.
+# CONFIG_JULIAN_TIME - Enables Julian time conversions
+# CONFIG_START_YEAR, CONFIG_START_MONTH, CONFIG_START_DAY -
+#   Used to initialize the internal time logic.
+# CONFIG_DEV_CONSOLE - Set if architecture-specific logic
+#   provides /dev/console.  Enables stdout, stderr, stdin.
+# CONFIG_DEV_LOWCONSOLE - Use the simple, low-level serial console
+#   driver (minimul support)
+# CONFIG_MUTEX_TYPES: Set to enable support for recursive and
+#   errorcheck mutexes. Enables pthread_mutexattr_settype().
+# CONFIG_PRIORITY_INHERITANCE : Set to enable support for priority
+#   inheritance on mutexes and semaphores. 
+# CONFIG_SEM_PREALLOCHOLDERS: This setting is only used if priority
+#   inheritance is enabled.  It defines the maximum number of
+#   different threads (minus one) that can take counts on a
+#   semaphore with priority inheritance support.  This may be 
+#   set to zero if priority inheritance is disabled OR if you
+#   are only using semaphores as mutexes (only one holder) OR
+#   if no more than two threads participate using a counting
+#   semaphore.
+# CONFIG_SEM_NNESTPRIO.  If priority inheritance is enabled,
+#   then this setting is the maximum number of higher priority
+#   threads (minus 1) than can be waiting for another thread
+#   to release a count on a semaphore.  This value may be set
+#   to zero if no more than one thread is expected to wait for
+#   a semaphore.
+# CONFIG_FDCLONE_DISABLE. Disable cloning of all file descriptors
+#   by task_create() when a new task is started.  If set, all
+#   files/drivers will appear to be closed in the new task.
+# CONFIG_FDCLONE_STDIO. Disable cloning of all but the first
+#   three file descriptors (stdin, stdout, stderr) by task_create()
+#   when a new task is started. If set, all files/drivers will
+#   appear to be closed in the new task except for stdin, stdout,
+#   and stderr.
+# CONFIG_SDCLONE_DISABLE. Disable cloning of all socket
+#   desciptors by task_create() when a new task is started. If
+#   set, all sockets will appear to be closed in the new task.
+#
+#CONFIG_APPS_DIR=
+CONFIG_DEBUG=n
+CONFIG_DEBUG_VERBOSE=n
+CONFIG_DEBUG_SYMBOLS=n
+CONFIG_MM_REGIONS=2
+CONFIG_ARCH_LOWPUTC=y
+CONFIG_RR_INTERVAL=0
+CONFIG_SCHED_INSTRUMENTATION=n
+CONFIG_TASK_NAME_SIZE=0
+CONFIG_START_YEAR=2007
+CONFIG_START_MONTH=2
+CONFIG_START_DAY=21
+CONFIG_JULIAN_TIME=n
+CONFIG_DEV_CONSOLE=n
+CONFIG_DEV_LOWCONSOLE=n
+CONFIG_MUTEX_TYPES=n
+CONFIG_PRIORITY_INHERITANCE=n
+CONFIG_SEM_PREALLOCHOLDERS=0
+CONFIG_SEM_NNESTPRIO=0
+CONFIG_FDCLONE_DISABLE=n
+CONFIG_FDCLONE_STDIO=n
+CONFIG_SDCLONE_DISABLE=y
+
+#
+# The following can be used to disable categories of
+# APIs supported by the OS.  If the compiler supports
+# weak functions, then it should not be necessary to
+# disable functions unless you want to restrict usage
+# of those APIs.
+#
+# There are certain dependency relationships in these
+# features.
+#
+# o mq_notify logic depends on signals to awaken tasks
+#   waiting for queues to become full or empty.
+# o pthread_condtimedwait() depends on signals to wake
+#   up waiting tasks.
+#
+CONFIG_DISABLE_CLOCK=y
+CONFIG_DISABLE_POSIX_TIMERS=y
+CONFIG_DISABLE_PTHREAD=y
+CONFIG_DISABLE_SIGNALS=y
+CONFIG_DISABLE_MQUEUE=y
+CONFIG_DISABLE_MOUNTPOINT=y
+CONFIG_DISABLE_ENVIRON=y
+CONFIG_DISABLE_POLL=y
+
+#
+# Misc libc settings
+#
+# CONFIG_NOPRINTF_FIELDWIDTH - sprintf-related logic is a
+#   little smaller if we do not support fieldwidthes
+#
+CONFIG_NOPRINTF_FIELDWIDTH=y
+
+#
+# Allow for architecture optimized implementations
+#
+# The architecture can provide optimized versions of the
+# following to improve sysem performance
+#
+CONFIG_ARCH_MEMCPY=n
+CONFIG_ARCH_MEMCMP=n
+CONFIG_ARCH_MEMMOVE=n
+CONFIG_ARCH_MEMSET=n
+CONFIG_ARCH_STRCMP=n
+CONFIG_ARCH_STRCPY=n
+CONFIG_ARCH_STRNCPY=n
+CONFIG_ARCH_STRLEN=n
+CONFIG_ARCH_STRNLEN=n
+CONFIG_ARCH_BZERO=n
+
+#
+# Sizes of configurable things (0 disables)
+#
+# CONFIG_MAX_TASKS - The maximum number of simultaneously
+#   actived tasks.  This value must be a power of two.
+# CONFIG_MAX_TASK_ARGS - This controls the maximum number of
+#   of parameters that a task may receive (i.e., maxmum value
+#   of 'argc')
+# CONFIG_NPTHREAD_KEYS - The number of items of thread-
+#   specific data that can be retained
+# CONFIG_NFILE_DESCRIPTORS - The maximum number of file
+#   descriptors (one for each open)
+# CONFIG_NFILE_STREAMS - The maximum number of streams that
+#   can be fopen'ed
+# CONFIG_NAME_MAX - The maximum size of a file name.
+# CONFIG_STDIO_BUFFER_SIZE - Size of the buffer to allocate
+#   on fopen. (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_NUNGET_CHARS - Number of characters that can be
+#   buffered by ungetc() (Only if CONFIG_NFILE_STREAMS > 0)
+# CONFIG_PREALLOC_MQ_MSGS - The number of pre-allocated message
+#   structures.  The system manages a pool of preallocated
+#   message structures to minimize dynamic allocations
+# CONFIG_MQ_MAXMSGSIZE - Message structures are allocated with
+#   a fixed payload size given by this settin (does not include
+#   other message structure overhead.
+# CONFIG_MAX_WDOGPARMS - Maximum number of parameters that
+#   can be passed to a watchdog handler
+# CONFIG_PREALLOC_WDOGS - The number of pre-allocated watchdog
+#   structures.  The system manages a pool of preallocated
+#   watchdog structures to minimize dynamic allocations
+# CONFIG_PREALLOC_TIMERS - The number of pre-allocated POSIX
+#   timer structures.  The system manages a pool of preallocated
+#   timer structures to minimize dynamic allocations.  Set to
+#   zero for all dynamic allocations.
+#
+CONFIG_MAX_TASKS=8
+CONFIG_MAX_TASK_ARGS=4
+CONFIG_NPTHREAD_KEYS=0
+CONFIG_NFILE_DESCRIPTORS=0
+CONFIG_NFILE_STREAMS=0
+CONFIG_NAME_MAX=32
+CONFIG_STDIO_BUFFER_SIZE=0
+CONFIG_NUNGET_CHARS=0
+CONFIG_PREALLOC_MQ_MSGS=0
+CONFIG_MQ_MAXMSGSIZE=0
+CONFIG_MAX_WDOGPARMS=2
+CONFIG_PREALLOC_WDOGS=4
+CONFIG_PREALLOC_TIMERS=0
+
+#
+# TCP/IP and UDP support via uIP
+# CONFIG_NET - Enable or disable all network features
+# CONFIG_NET_IPv6 - Build in support for IPv6
+# CONFIG_NSOCKET_DESCRIPTORS - Maximum number of socket descriptors per task/thread.
+# CONFIG_NET_SOCKOPTS - Enable or disable support for socket options
+# CONFIG_NET_BUFSIZE - uIP buffer size
+# CONFIG_NET_TCP - TCP support on or off
+# CONFIG_NET_TCP_CONNS - Maximum number of TCP connections (all tasks)
+# CONFIG_NET_TCP_READAHEAD_BUFSIZE - Size of TCP read-ahead buffers
+# CONFIG_NET_NTCP_READAHEAD_BUFFERS - Number of TCP read-ahead buffers (may be zero)
+# CONFIG_NET_TCPBACKLOG - Incoming connections pend in a backlog until
+#   accept() is called. The size of the backlog is selected when listen() is called.
+# CONFIG_NET_MAX_LISTENPORTS - Maximum number of listening TCP ports (all tasks)
+# CONFIG_NET_UDP - UDP support on or off
+# CONFIG_NET_UDP_CHECKSUMS - UDP checksums on or off
+# CONFIG_NET_UDP_CONNS - The maximum amount of concurrent UDP connections
+# CONFIG_NET_ICMP - ICMP ping response support on or off
+# CONFIG_NET_ICMP_PING - ICMP ping request support on or off
+# CONFIG_NET_PINGADDRCONF - Use "ping" packet for setting IP address
+# CONFIG_NET_STATISTICS - uIP statistics on or off
+# CONFIG_NET_RECEIVE_WINDOW - The size of the advertised receiver's window
+# CONFIG_NET_ARPTAB_SIZE - The size of the ARP table
+# CONFIG_NET_BROADCAST - Broadcast support
+# CONFIG_NET_FWCACHE_SIZE - number of packets to remember when looking for duplicates
+#
+CONFIG_NET=n
+CONFIG_NET_IPv6=n
+CONFIG_NSOCKET_DESCRIPTORS=0
+CONFIG_NET_SOCKOPTS=y
+CONFIG_NET_BUFSIZE=420
+CONFIG_NET_TCP=n
+CONFIG_NET_TCP_CONNS=40
+CONFIG_NET_MAX_LISTENPORTS=40
+CONFIG_NET_UDP=n
+CONFIG_NET_UDP_CHECKSUMS=y
+#CONFIG_NET_UDP_CONNS=10
+CONFIG_NET_ICMP=n
+CONFIG_NET_ICMP_PING=n
+#CONFIG_NET_PINGADDRCONF=0
+CONFIG_NET_STATISTICS=y
+#CONFIG_NET_RECEIVE_WINDOW=
+#CONFIG_NET_ARPTAB_SIZE=8
+CONFIG_NET_BROADCAST=n
+#CONFIG_NET_FWCACHE_SIZE=2
+
+#
+# UIP Network Utilities
+# CONFIG_NET_DHCP_LIGHT - Reduces size of DHCP
+# CONFIG_NET_RESOLV_ENTRIES - Number of resolver entries
+CONFIG_NET_DHCP_LIGHT=n
+CONFIG_NET_RESOLV_ENTRIES=4
+
+#
+# Settings for examples/nsh
+CONFIG_NSH_CONSOLE=y
+CONFIG_NSH_TELNET=n
+CONFIG_NSH_IOBUFFER_SIZE=512
+CONFIG_NSH_CMD_SIZE=40
+CONFIG_NSH_STACKSIZE=4096
+CONFIG_NSH_DHCPC=n
+CONFIG_NSH_NOMAC=n
+CONFIG_NSH_IPADDR=(10<<24|0<<16|0<<8|2)
+CONFIG_NSH_DRIPADDR=(10<<24|0<<16|0<<8|1)
+CONFIG_NSH_NETMASK=(255<<24|255<<16|255<<8|0)
+
+#
+# Stack and heap information
+#
+# CONFIG_BOOT_RUNFROMFLASH - Some configurations support XIP
+#   operation from FLASH but must copy initialized .data sections to RAM.
+# CONFIG_BOOT_COPYTORAM -  Some configurations boot in FLASH
+#   but copy themselves entirely into RAM for better performance.
+# CONFIG_CUSTOM_STACK - The up_ implementation will handle
+#   all stack operations outside of the nuttx model.
+# CONFIG_STACK_POINTER - The initial stack pointer
+# CONFIG_IDLETHREAD_STACKSIZE - The size of the initial stack.
+#  This is the thread that (1) performs the inital boot of the system up
+#  to the point where user_start() is spawned, and (2) there after is the
+#  IDLE thread that executes only when there is no other thread ready to
+#  run.
+# CONFIG_USERMAIN_STACKSIZE - The size of the stack to allocate
+#  for the main user thread that begins at the user_start() entry point.
+# CONFIG_PTHREAD_STACK_MIN - Minimum pthread stack size
+# CONFIG_PTHREAD_STACK_DEFAULT - Default pthread stack size
+# CONFIG_HEAP_BASE - The beginning of the heap
+# CONFIG_HEAP_SIZE - The size of the heap
+#
+CONFIG_BOOT_RUNFROMFLASH=n
+CONFIG_BOOT_COPYTORAM=n
+CONFIG_CUSTOM_STACK=y
+CONFIG_IDLETHREAD_STACKSIZE=
+CONFIG_USERMAIN_STACKSIZE=
+CONFIG_PTHREAD_STACK_MIN=
+CONFIG_PTHREAD_STACK_DEFAULT=
+CONFIG_HEAP_BASE=
+CONFIG_HEAP_SIZE=
diff --git a/nuttx/configs/pjrc-8051/include/README.txt b/nuttx/configs/pjrc-8051/include/README.txt
new file mode 100644
index 000000000..073c155f0
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/include/README.txt
@@ -0,0 +1 @@
+This directory contains header files unique to the PJRC 87C52 development board.
diff --git a/nuttx/configs/pjrc-8051/include/board.h b/nuttx/configs/pjrc-8051/include/board.h
new file mode 100644
index 000000000..fe036da8c
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/include/board.h
@@ -0,0 +1,51 @@
+/************************************************************
+ * board/board.h
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************/
+
+#ifndef __ARCH_BOARD_BOARD_H
+#define __ARCH_BOARD_BOARD_H
+
+/************************************************************
+ * Included Files
+ ************************************************************/
+
+/************************************************************
+ * Definitions
+ ************************************************************/
+
+/************************************************************
+ * Inline Functions
+ ************************************************************/
+
+#endif  /* __ARCH_BOARD_BOARD_H */
diff --git a/nuttx/configs/pjrc-8051/include/pjrc.h b/nuttx/configs/pjrc-8051/include/pjrc.h
new file mode 100644
index 000000000..50dfe01f2
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/include/pjrc.h
@@ -0,0 +1,215 @@
+/**************************************************************************
+ * pjrc.h
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ **************************************************************************/
+
+#ifndef __PJRC_H
+#define __PJRC_H
+
+/**************************************************************************
+ * Included Files
+ **************************************************************************/
+
+#include <stdint.h>
+
+/**************************************************************************
+ * Public Definitions
+ **************************************************************************/
+
+/**************************************************************************
+ * Public Types
+ **************************************************************************/
+
+/**************************************************************************
+ * Public Variables
+ **************************************************************************/
+
+/* Memory Map
+ *
+ * BEGIN  END     DESCRIPTION
+ * 0x0000 0x1fff  CODE:   ROM containg PAULMON2
+ *                DATA:   RAM for program variables
+ * 0x2000 0x7fff  COMMON: RAM for program code or
+ *                        variables
+ * 0x8000 0xf7ff  COMMON: FLASH for program code
+ * 0xf800 0xfeff  COMMON: Peripherals
+ * 0xff00 0xffff  COMMON: unused
+ *
+ * Program code may be loaded at the RAM location 0x2000-0x7fff
+ * for testing.  If loaded into the FLASH location at
+ * 0x8000-0xf7ff, PAULMON2 will automatically write the program
+ * into flash.  The program is configured in the RAM-based test
+ * configuration:
+ */
+
+#define RAM_BLOCK_START  IRAM_SIZE
+#define RAM_BLOCK_END    0x1fff
+
+#define PROGRAM_BASE     0x2000
+#define PROGRAM_END      0x7fff
+
+#define FLASH_BASE       0x8000
+#define FLASH_END        0xf7ff
+
+/* Well-known entry points to access PAULMON2's built-in functions */
+
+#define PM2_ENTRY_PHEX1   0x002e
+#define PM2_ENTRY_COUT    0x0030
+#define PM2_ENTRY_CIN     0x0032
+#define PM2_ENTRY_PHEX    0x0034
+#define PM2_ENTRY_PHEX16  0x0036
+#define PM2_ENTRY_PSTR    0x0038
+#define PM2_ENTRY_ESC     0x003e
+#define PM2_ENTRY_UPPER   0x0040
+#define PM2_ENTRY_PINT8U  0x004D
+#define PM2_ENTRY_PINT8   0x0050
+#define PM2_ENTRY_PINT16U 0x0053
+#define PM2_ENTRY_NEWLINE 0x0048
+#define PM2_ENTRY_PRGM    0x0059
+#define PM2_ENTRY_ERBLOCK 0x0067
+
+/* PAULMON2 captures all interrupt vectors in ROM but relays them
+ * through the following RAM addresses:
+ */
+
+#define PM2_VECTOR_BASE    PROGRAM_BASE
+#define PM2_VECTOR_EXTINT0 (PM2_VECTOR_BASE + 3)
+#define PM2_VECTOR_TIMER0  (PM2_VECTOR_BASE + 11)
+#define PM2_VECTOR_EXTINT1 (PM2_VECTOR_BASE + 19)
+#define PM2_VECTOR_TIMER1  (PM2_VECTOR_BASE + 27)
+#define PM2_VECTOR_UART    (PM2_VECTOR_BASE + 35)
+#define PM2_VECTOR_TIMER2  (PM2_VECTOR_BASE + 43)
+
+/* Peripheral Mapping
+ *
+ * Begin End   Peripheral      Addr Acc Function
+ * F800  F8FF  82C55 (A, B, C) F800 R/W Port A
+ *                             F801 R/W Port B
+ *                             F802 R/W Port C
+ *                             F803 W   Config A,B,C
+ * F900  F9FF  82C55 (D, E, F) F900 R/W Port D
+ *                             F901 R/W Port E (LEDs)
+ *                             F902 R/W Port F
+ *                             F903 W   Config D,E,F
+ * FA00  FAFF  User Expansion
+ * FB00  FBFF  User Expansion
+ * FC00  FCFF  User Expansion
+ * FD00  FDFF  User Expansion
+ * FE00  FEFF  LCD Port        FE00 W   Command Register
+ *                             FE01 R   Status Register
+ *                             FE02 W   Display or CGRAM Buffer
+ *                             FE03 R   "     " "" "   " "    "
+ *
+ * These are the memory-mapped locations used to access  the two 82C55
+ * chips
+ */
+
+#ifndef __ASSEMBLY__
+xdata at 0xF800 uint8_t p82c55_port_a;
+xdata at 0xF801 uint8_t p82c55_port_b;
+xdata at 0xF802 uint8_t p82c55_port_c;
+xdata at 0xF803 uint8_t p82c55_abc_config;
+xdata at 0xF900 uint8_t p82c55_port_d;
+xdata at 0xF901 uint8_t p82c55_port_e;
+xdata at 0xF902 uint8_t p82c55_port_f;
+xdata at 0xF903 uint8_t p82c55_def_config;
+#endif
+
+/* LED (Port E) bit definitions */
+
+#define LED_STARTED                 0
+#define LED_HEAPALLOCATE            1
+#define LED_IRQSENABLED             2
+#define LED_IDLE                    3
+#define LED_UNUSED2                 4
+#define LED_INIRQ                   5
+#define LED_ASSERTION               6
+#define LED_PANIC                   7
+
+/* Registers.  8052 regiser definitions are provided in the SDCC header
+ * file 8052.h.  However, a few SFR registers are missing from that
+ * file (they can be found in mcs51reg.h, but that file is too much
+ * when the following simple addtions do the job).
+ */
+
+#ifndef __ASSEMBLY__
+sfr at 0xc9 T2MOD ;
+#endif
+
+/* Timing information.
+ *
+ * The PJRC board is based on a standard 87C52 CPU clocked at 22.1184 MHz.
+ * The CPU clock is divided by 12 to yield a clock frequency of 1.8432 MHz.
+ */
+
+#define CPU_CLOCK_HZ      22118400L
+#define TIMER_CLOCK_HZ     1843200L
+
+/* The 87C52 has three timers, timer 0, timer 1, and timer 2.  On the PJRC
+ * board, timer 1 and 2 have dedicated functions.  They provide baud support
+ * support for the boards two serial ports.  Unfortunately, only timer 2
+ * can generate the accurate 100Hz timer desired by the OS.
+ *
+ * Timer 0 provides only a 8-bit auto-reload mode.
+ */
+
+#ifdef CONFIG_8052_TIMER2
+
+/* To use timer 2 as the 100Hz system timer, we need to calculate a 16-bit
+ * reload value that results in 100Hz overflow interrupts.  That value
+ * is given by:
+ *
+ * Timer ticks   = TIMER_CLOCK_HZ / (desired ticks-per-second)
+ *               = 18432
+ * Capture value = 0xffff - (Timer ticks)
+ *               = 47103 = 0x67ff
+ */
+
+# define TIMER2_CAPTURE_LOW  0xff
+# define TIMER2_CAPTURE_HIGH 0x67
+
+#else
+
+/* Timer 0, mode 0 can be used as a system timer.  In that mode, the
+ * 1.8432 is further divided by 32.  A single 8-bit value is incremented
+ * at 57600 Hz, which results in 225 Timer 0 overflow interrupts per
+ * second.
+ */
+
+#endif
+
+/**************************************************************************
+ * Public Function Prototypes
+ **************************************************************************/
+
+#endif /* __PJRC_H */
diff --git a/nuttx/configs/pjrc-8051/sdcc-2.6.0.patch b/nuttx/configs/pjrc-8051/sdcc-2.6.0.patch
new file mode 100644
index 000000000..beb8bf2ea
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/sdcc-2.6.0.patch
@@ -0,0 +1,28 @@
+diff -u sdcc/device/lib/Makefile.orig sdcc/device/lib/Makefile
+--- sdcc/device/lib/Makefile.orig	2007-03-06 09:55:01.000000000 -0600
++++ sdcc/device/lib/Makefile	2007-03-06 09:58:32.000000000 -0600
+@@ -242,7 +242,7 @@
+ model-mcs51-stack-auto:
+ 	if [ "`grep mcs51 $(top_builddir)ports.build`" = mcs51 ]; then \
+ 	  for model in $(MODELS); do \
+-	    $(MAKE) MODELFLAGS="--model-$$model --stack-auto" PORT=$$model PORTDIR=$(BUILDDIR)/$$model-stack-auto PORTINCDIR=$(INCDIR)/mcs51 objects; \
++	    $(MAKE) MODELFLAGS="--model-$$model --stack-auto --int-long-reent --float-reent" PORT=$$model PORTDIR=$(BUILDDIR)/$$model-stack-auto PORTINCDIR=$(INCDIR)/mcs51 objects; \
+ 	  done \
+ 	fi
+ 
+diff -u sdcc/device/include/stdarg.h.orig sdcc/device/include/stdarg.h 
+--- sdcc/device/include/stdarg.h.orig	2007-03-11 13:21:15.000000000 -0600
++++ sdcc/device/include/stdarg.h	2007-03-11 13:26:59.000000000 -0600
+@@ -25,9 +25,9 @@
+ 
+ #else
+ 
+-typedef	unsigned char __data * va_list ;
+-#define va_arg(marker,type) *((type __data * )(marker -= sizeof(type)))
+-#define	va_start(marker,first) { marker = (va_list) ((char __data * )&first); }
++typedef	unsigned char * va_list ;
++#define va_arg(marker,type) *((type * )(marker -= sizeof(type)))
++#define	va_start(marker,first) { marker = (va_list) ((char * )&first); }
+ 
+ #endif
+ 
diff --git a/nuttx/configs/pjrc-8051/setenv.sh b/nuttx/configs/pjrc-8051/setenv.sh
new file mode 100755
index 000000000..35f5fffed
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/setenv.sh
@@ -0,0 +1,45 @@
+#!/bin/bash
+# pjrc-8051/setenv.sh
+#
+#   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+if [ "$(basename $0)" = "setenv.sh" ] ; then
+  echo "You must source this script, not run it!" 1>&2
+  exit 1
+fi
+
+if [ -z ${PATH_ORIG} ]; then export PATH_ORIG=${PATH}; fi
+
+export SDCC_BIN=/usr/local/bin
+export PATH=${SDCC_BIN}:/sbin:/usr/sbin:${PATH_ORIG}
+
+echo "PATH : ${PATH}"
diff --git a/nuttx/configs/pjrc-8051/src/Makefile b/nuttx/configs/pjrc-8051/src/Makefile
new file mode 100644
index 000000000..d6af2a6fe
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/src/Makefile
@@ -0,0 +1,76 @@
+############################################################################
+# configs/pjrc-8051/src/Makefile
+#
+#   Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name NuttX nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+
+-include $(TOPDIR)/Make.defs
+
+CFLAGS		+= -I$(TOPDIR)/sched
+
+ASRCS		= 
+AOBJS		= $(ASRCS:.S=$(OBJEXT))
+CSRCS		= up_leds.c
+COBJS		= $(CSRCS:.c=$(OBJEXT))
+
+SRCS		= $(ASRCS) $(CSRCS)
+OBJS		= $(AOBJS) $(COBJS)
+
+CFLAGS		+= -I $(TOPDIR)/arch/$(CONFIG_ARCH)/src
+
+all: libboard$(LIBEXT)
+
+$(AOBJS): %$(OBJEXT): %.S
+	$(call ASSEMBLE, $<, $@)
+
+$(COBJS) $(LINKOBJS): %$(OBJEXT): %.c
+	$(call COMPILE, $<, $@)
+
+libboard$(LIBEXT): $(OBJS)
+	@( for obj in $(OBJS) ; do \
+		$(call ARCHIVE, $@, $${obj}); \
+	done ; )
+
+.depend: Makefile $(SRCS)
+	@$(MKDEP) $(CC) -- $(CFLAGS) -- $(SRCS) >Make.dep
+	@touch $@
+
+depend: .depend
+
+clean:
+	@rm -f libboard$(LIBEXT) *~ .*.swp
+	$(call CLEAN)
+
+distclean: clean
+	@rm -f Make.dep .depend
+
+-include Make.dep
diff --git a/nuttx/configs/pjrc-8051/src/README.txt b/nuttx/configs/pjrc-8051/src/README.txt
new file mode 100644
index 000000000..74f820427
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/src/README.txt
@@ -0,0 +1 @@
+This directory contains drivers unique to the PJRC 87C52 board.
diff --git a/nuttx/configs/pjrc-8051/src/up_leds.c b/nuttx/configs/pjrc-8051/src/up_leds.c
new file mode 100644
index 000000000..5ac842d1e
--- /dev/null
+++ b/nuttx/configs/pjrc-8051/src/up_leds.c
@@ -0,0 +1,207 @@
+/************************************************************************
+ * up_leds.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name Gregory Nutt nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ************************************************************************/
+
+/************************************************************************
+ * Included Files
+ ************************************************************************/
+
+#include <nuttx/config.h>
+#include <stdint.h>
+#include "up_internal.h"
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+#define RESET_KLUDGE_NEEDED 1
+
+/************************************************************************
+ * Private Data
+ ************************************************************************/
+
+static uint8_t g_ledstate;
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+#if defined(CONFIG_LED_DEBUG) && defined(CONFIG_ARCH_LEDS)
+static void _up_puthex(uint8_t hex) __naked
+{
+  hex; /* To avoid unreferenced argument warning */
+  _asm
+        mov     a, dpl
+        ljmp    PM2_ENTRY_PHEX
+  _endasm;
+}
+
+static void _up_putch(uint8_t ch) __naked
+{
+  _asm
+        mov     a, dpl
+        ljmp	PM2_ENTRY_COUT
+  _endasm;
+}
+
+static void _up_putnl(void) __naked
+{
+  _asm
+	ljmp	PM2_ENTRY_NEWLINE
+  _endasm;
+}
+
+# define _up_showledinit() \
+  _up_putch('I'); \
+  _up_puthex(g_ledstate); _up_putch(':'); \
+  _up_puthex(p82c55_port_e); _up_putnl();
+
+# define _up_showledreset() \
+  _up_putch('R'); \
+  _up_puthex(led); _up_putch(':'); \
+  _up_puthex(g_ledstate); _up_putch(':'); \
+  _up_puthex(p82c55_port_e); _up_putnl();
+
+# define _up_showledon() \
+  _up_putch('+'); \
+  _up_puthex(led); _up_putch(':'); \
+  _up_puthex(g_ledstate); _up_putch(':'); \
+  _up_puthex(p82c55_port_e); _up_putnl();
+
+# define _up_showledoff() \
+  _up_putch('-'); \
+  _up_puthex(led); _up_putch(':'); \
+  _up_puthex(g_ledstate); _up_putch(':'); \
+  _up_puthex(p82c55_port_e); _up_putnl();
+
+#else
+
+# define _up_showledinit()
+# define _up_showledreset()
+# define _up_showledon()
+# define _up_showledoff()
+
+#endif
+
+/************************************************************************
+ * Public Funtions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: up_ledinit
+ ************************************************************************/
+
+#ifdef CONFIG_ARCH_LEDS
+void up_ledinit(void)
+{
+  /* Set all ports as outputs */
+
+  p82c55_def_config = 128;
+
+  /* Turn LED 1-7 off; turn LED 0 on */
+
+  g_ledstate    = 0xfe;
+  p82c55_port_e = g_ledstate;
+
+  _up_showledinit();
+}
+
+/************************************************************************
+ * Name: up_ledon
+ ************************************************************************/
+
+void up_ledon(uint8_t led)
+{
+  /* This may be called from an interrupt handler */
+
+  irqstate_t flags = irqsave();
+
+#ifdef RESET_KLUDGE_NEEDED
+  /* I don't understand why this happens yet, but sometimes
+   * it is necessary to reconfigure port E.
+   */
+
+  if (g_ledstate != p82c55_port_e)
+    {
+      _up_showledreset();
+      p82c55_def_config = 128;
+    }
+#endif
+
+  /* Clear the bit in port E corresponding to LED to turn it on */
+
+  if (led < 8)
+    {
+      g_ledstate   &= ~(g_ntobit[led]);
+      p82c55_port_e = g_ledstate;
+    }
+
+  _up_showledon();
+  irqrestore(flags);
+}
+
+/************************************************************************
+ * Name: up_ledoff
+ ************************************************************************/
+
+void up_ledoff(uint8_t led)
+{
+  /* This may be called from an interrupt handler */
+
+  irqstate_t flags = irqsave();
+
+#ifdef RESET_KLUDGE_NEEDED
+  /* I don't understand why this happens yet, but sometimes
+   * it is necessary to reconfigure port E.
+   */
+
+  if (g_ledstate != p82c55_port_e)
+    {
+      _up_showledreset();
+      p82c55_def_config = 128;
+    }
+#endif
+
+  /* Set the bit in port E corresponding to LED to turn it off */
+
+  if (led < 8)
+    {
+      g_ledstate   |= g_ntobit[led];
+      p82c55_port_e = g_ledstate;
+    }
+
+  _up_showledoff();
+  irqrestore(flags);
+}
+#endif /* CONFIG_ARCH_LEDS */