Zmodem utilities can now be built for Linux; Fix some configuration confusion

17 files changed, 1065 insertions, 14 deletions

diff --git a/apps/ChangeLog.txt b/apps/ChangeLog.txt
index 0029d0ca8..7800c837c 100644
--- a/apps/ChangeLog.txt
+++ b/apps/ChangeLog.txt
@@ -610,3 +610,6 @@
 	* apps/system/zmodem:  The 'rz' command is now complete and functional
 	  under certain conditaions.  There are, however, some data overrun
 	  issues that I am still uncertain how should be handled (2012-7-15).
+	* apps/system/zmodem/Makefile.host and host/: The Zmodem utilities
+	  can now be built to execute on a Linux host.
+
diff --git a/apps/include/zmodem.h b/apps/include/zmodem.h
index d249875ad..98eedcb2a 100644
--- a/apps/include/zmodem.h
+++ b/apps/include/zmodem.h
@@ -112,8 +112,8 @@
  * in the code now!
  */
 
-#ifndef CONFIG_SYSTEM_ZMODEM_MOUNTPOINT
-#  warning CONFIG_SYSTEM_ZMODEM_RCVSAMPLE not yet support
+#ifdef CONFIG_SYSTEM_ZMODEM_RCVSAMPLE
+#  warning CONFIG_SYSTEM_ZMODEM_RCVSAMPLE not yet supported
 #  undef CONFIG_SYSTEM_ZMODEM_RCVSAMPLE
 #endif
 
@@ -124,8 +124,8 @@
  * in the code now!
  */
 
-#ifndef CONFIG_SYSTEM_ZMODEM_SENDATTN
-#  warning CONFIG_SYSTEM_ZMODEM_SENDATTN not yet support
+#ifdef CONFIG_SYSTEM_ZMODEM_SENDATTN
+#  warning CONFIG_SYSTEM_ZMODEM_SENDATTN not yet supported
 #  undef CONFIG_SYSTEM_ZMODEM_SENDATTN
 #endif
 
diff --git a/apps/system/zmodem/.gitignore b/apps/system/zmodem/.gitignore
index fa1ec7579..01a12bcb2 100644
--- a/apps/system/zmodem/.gitignore
+++ b/apps/system/zmodem/.gitignore
@@ -9,3 +9,7 @@
 /*.adb
 /*.lib
 /*.src
+/*.exe
+sz
+rz
+
diff --git a/apps/system/zmodem/Kconfig b/apps/system/zmodem/Kconfig
index 120aa702b..7ec838efc 100644
--- a/apps/system/zmodem/Kconfig
+++ b/apps/system/zmodem/Kconfig
@@ -106,12 +106,6 @@ config SYSTEM_ZMODEM_SENDATTN
 	---help---
 		Send attention string not yet supported
 
-config SYSTEM_ZMODEM_FULLSTREAMING
-	bool "Full streaming"
-	default n
-	---help---
-		Full streaming is not yet supported
-
 config SYSTEM_ZMODEM_SENDBRAK
 	bool "Can break"
 	default n
diff --git a/apps/system/zmodem/Makefile.host b/apps/system/zmodem/Makefile.host
new file mode 100755
index 000000000..00f28ecec
--- /dev/null
+++ b/apps/system/zmodem/Makefile.host
@@ -0,0 +1,92 @@
+############################################################################
+# apps/system/zmodem/Makefile.host
+#
+#   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+#   Author: Gregory Nutt <gnutt@nuttx.org>
+#
+# 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.
+#
+############################################################################
+# TOPDIR and APPDIR must be defined on the make command line
+
+-include $(TOPDIR)/.config
+-include $(TOPDIR)/Make.defs
+include $(APPDIR)/Make.defs
+
+NUTTXINC = $(TOPDIR)/include
+APPSINC  = $(APPDIR)/include
+
+ZMODEM   = $(APPDIR)/system/zmodem
+HOSTDIR  = $(ZMODEM)/host
+HOSTAPPS = $(ZMODEM)/host/apps
+
+HOSTCFLAGS  += -isystem $(HOSTDIR) -I $(ZMODEM)
+HOSTCFLAGS  += -Dsz_main=main -Drz_main=main
+ifeq ($(CONFIG_DEBUG),y)
+HOSTCFLAGS  += -DCONFIG_DEBUG_ZMODEM=1 -DCONFIG_SYSTEM_ZMODEM_DUMPBUFFER=1
+endif
+
+# Zmodem sz and rz commands
+
+SZSRCS   = sz_main.c zm_send.c
+RZSRCS   = rz_main.c zm_receive.c
+CMNSRCS  = zm_state.c zm_proto.c zm_watchdog.c zm_utils.c zm_dumpbuffer.c
+CMNSRCS += crc16.c crc32.c
+SRCS     = $(SZSRCS) $(RZSRCS) $(CMNSRCS)
+
+SZOBJS   = $(SZSRCS:.c=$(OBJEXT))
+RZOBJS   = $(RZSRCS:.c=$(OBJEXT))
+CMNOBJS  = $(CMNSRCS:.c=$(OBJEXT))
+OBJS     = $(SRCS:.c=$(OBJEXT))
+
+RZBIN    = rz$(EXEEXT)
+SZBIN    = sz$(EXEEXT)
+
+VPATH    = host
+
+all: $(RZBIN) $(SZBIN)
+.PHONY: clean
+
+$(OBJS): %$(OBJEXT): %.c
+	$(Q) $(HOSTCC) -c $(HOSTCFLAGS) -o $@ $<
+
+$(HOSTAPPS)/zmodem.h: $(APPSINC)/zmodem.h
+	$(Q) cp $(APPSINC)/zmodem.h $(HOSTAPPS)/zmodem.h
+
+$(RZBIN): $(HOSTAPPS)/zmodem.h $(RZOBJS) $(CMNOBJS)
+	$(Q) $(HOSTCC) $(HOSTCFLAGS) -o $@ $(RZOBJS) $(CMNOBJS)
+
+$(SZBIN): $(HOSTAPPS)/zmodem.h $(SZOBJS) $(CMNOBJS)
+	$(Q) $(HOSTCC) $(HOSTCFLAGS) -o $@ $(SZOBJS) $(CMNOBJS)
+
+clean:
+ifneq ($(OBJEXT),)
+	rm -f *$(OBJEXT)
+endif
+	rm -f $(RZBIN) $(SZBIN)
+	rm -f $(HOSTAPPS)/zmodem.h
diff --git a/apps/system/zmodem/host/apps/.gitignore b/apps/system/zmodem/host/apps/.gitignore
new file mode 100644
index 000000000..44dfc6691
--- /dev/null
+++ b/apps/system/zmodem/host/apps/.gitignore
@@ -0,0 +1,2 @@
+zmodem.h
+
diff --git a/apps/system/zmodem/host/crc16.c b/apps/system/zmodem/host/crc16.c
new file mode 100644
index 000000000..f37609996
--- /dev/null
+++ b/apps/system/zmodem/host/crc16.c
@@ -0,0 +1,138 @@
+/************************************************************************************************
+ * apps/system/zmodem/host/crc16.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * References:
+ *
+ *   crc16_tab calculated by Mark G. Mendel, Network Systems Corporation.
+ *   crc16part() logic derived from article Copyright (C) 1986 Stephen Satchell.
+ *
+ * "Programmers may incorporate any or all code into their programs,
+ *  giving proper credit within the source. Publication of the
+ *  source routines is permitted so long as proper credit is given
+ *  to Stephen Satchell, Satchell Evaluations and Chuck Forsberg,
+ *  Omen Technology."
+ *
+ * Re-released under the Modified BSD license which, I believe, is consistent with the
+ * original authors' intent:
+ *
+ * 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.
+ *
+ ************************************************************************************************/
+
+/************************************************************************************************
+ * Included Files
+ ************************************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <crc16.h>
+
+/************************************************************************************************
+ * Private Data
+ ************************************************************************************************/
+
+/* crc16_tab calculated by Mark G. Mendel, Network Systems Corporation */
+
+static uint16_t crc16_tab[256] =
+{
+  0x0000,  0x1021,  0x2042,  0x3063,  0x4084,  0x50a5,  0x60c6,  0x70e7,
+  0x8108,  0x9129,  0xa14a,  0xb16b,  0xc18c,  0xd1ad,  0xe1ce,  0xf1ef,
+  0x1231,  0x0210,  0x3273,  0x2252,  0x52b5,  0x4294,  0x72f7,  0x62d6,
+  0x9339,  0x8318,  0xb37b,  0xa35a,  0xd3bd,  0xc39c,  0xf3ff,  0xe3de,
+  0x2462,  0x3443,  0x0420,  0x1401,  0x64e6,  0x74c7,  0x44a4,  0x5485,
+  0xa56a,  0xb54b,  0x8528,  0x9509,  0xe5ee,  0xf5cf,  0xc5ac,  0xd58d,
+  0x3653,  0x2672,  0x1611,  0x0630,  0x76d7,  0x66f6,  0x5695,  0x46b4,
+  0xb75b,  0xa77a,  0x9719,  0x8738,  0xf7df,  0xe7fe,  0xd79d,  0xc7bc,
+  0x48c4,  0x58e5,  0x6886,  0x78a7,  0x0840,  0x1861,  0x2802,  0x3823,
+  0xc9cc,  0xd9ed,  0xe98e,  0xf9af,  0x8948,  0x9969,  0xa90a,  0xb92b,
+  0x5af5,  0x4ad4,  0x7ab7,  0x6a96,  0x1a71,  0x0a50,  0x3a33,  0x2a12,
+  0xdbfd,  0xcbdc,  0xfbbf,  0xeb9e,  0x9b79,  0x8b58,  0xbb3b,  0xab1a,
+  0x6ca6,  0x7c87,  0x4ce4,  0x5cc5,  0x2c22,  0x3c03,  0x0c60,  0x1c41,
+  0xedae,  0xfd8f,  0xcdec,  0xddcd,  0xad2a,  0xbd0b,  0x8d68,  0x9d49,
+  0x7e97,  0x6eb6,  0x5ed5,  0x4ef4,  0x3e13,  0x2e32,  0x1e51,  0x0e70,
+  0xff9f,  0xefbe,  0xdfdd,  0xcffc,  0xbf1b,  0xaf3a,  0x9f59,  0x8f78,
+  0x9188,  0x81a9,  0xb1ca,  0xa1eb,  0xd10c,  0xc12d,  0xf14e,  0xe16f,
+  0x1080,  0x00a1,  0x30c2,  0x20e3,  0x5004,  0x4025,  0x7046,  0x6067,
+  0x83b9,  0x9398,  0xa3fb,  0xb3da,  0xc33d,  0xd31c,  0xe37f,  0xf35e,
+  0x02b1,  0x1290,  0x22f3,  0x32d2,  0x4235,  0x5214,  0x6277,  0x7256,
+  0xb5ea,  0xa5cb,  0x95a8,  0x8589,  0xf56e,  0xe54f,  0xd52c,  0xc50d,
+  0x34e2,  0x24c3,  0x14a0,  0x0481,  0x7466,  0x6447,  0x5424,  0x4405,
+  0xa7db,  0xb7fa,  0x8799,  0x97b8,  0xe75f,  0xf77e,  0xc71d,  0xd73c,
+  0x26d3,  0x36f2,  0x0691,  0x16b0,  0x6657,  0x7676,  0x4615,  0x5634,
+  0xd94c,  0xc96d,  0xf90e,  0xe92f,  0x99c8,  0x89e9,  0xb98a,  0xa9ab,
+  0x5844,  0x4865,  0x7806,  0x6827,  0x18c0,  0x08e1,  0x3882,  0x28a3,
+  0xcb7d,  0xdb5c,  0xeb3f,  0xfb1e,  0x8bf9,  0x9bd8,  0xabbb,  0xbb9a,
+  0x4a75,  0x5a54,  0x6a37,  0x7a16,  0x0af1,  0x1ad0,  0x2ab3,  0x3a92,
+  0xfd2e,  0xed0f,  0xdd6c,  0xcd4d,  0xbdaa,  0xad8b,  0x9de8,  0x8dc9,
+  0x7c26,  0x6c07,  0x5c64,  0x4c45,  0x3ca2,  0x2c83,  0x1ce0,  0x0cc1,
+  0xef1f,  0xff3e,  0xcf5d,  0xdf7c,  0xaf9b,  0xbfba,  0x8fd9,  0x9ff8,
+  0x6e17,  0x7e36,  0x4e55,  0x5e74,  0x2e93,  0x3eb2,  0x0ed1,  0x1ef0
+};
+
+#define updcrc(cp, crc) ( crc16_tab[((crc >> 8) & 255)] ^ (crc << 8) ^ cp)
+
+/************************************************************************************************
+ * Public Functions
+ ************************************************************************************************/
+/************************************************************************************************
+ * Name: crc16part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ************************************************************************************************/
+
+uint16_t crc16part(const uint8_t *src, size_t len, uint16_t crc16val)
+{
+  size_t i;
+
+  for (i = 0;  i < len;  i++)
+    {
+      crc16val = crc16_tab[((crc16val >> 8) & 255)] ^ (crc16val << 8) ^ src[i];
+    }
+
+  return crc16val;
+}
+
+/************************************************************************************************
+ * Name: crc16
+ *
+ * Description:
+ *   Return a 16-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ************************************************************************************************/
+
+uint16_t crc16(const uint8_t *src, size_t len)
+{
+  return crc16part(src, len, 0);
+}
diff --git a/apps/system/zmodem/host/crc16.h b/apps/system/zmodem/host/crc16.h
new file mode 100644
index 000000000..7e0ac5e85
--- /dev/null
+++ b/apps/system/zmodem/host/crc16.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+ * apps/system/zmodem/host/crc16.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_CRC16_H
+#define __APPS_SYSTEM_ZMODEM_HOST_CRC16_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: crc16part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ****************************************************************************/
+
+uint16_t crc16part(const uint8_t *src, size_t len, uint16_t crc16val);
+
+/****************************************************************************
+ * Name: crc16
+ *
+ * Description:
+ *   Return a 16-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ****************************************************************************/
+
+uint16_t crc16(const uint8_t *src, size_t len);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_CRC16_H */
diff --git a/apps/system/zmodem/host/crc32.c b/apps/system/zmodem/host/crc32.c
new file mode 100644
index 000000000..01b92a32c
--- /dev/null
+++ b/apps/system/zmodem/host/crc32.c
@@ -0,0 +1,123 @@
+/************************************************************************************************
+ * apps/system/zmodem/host/crc32.c
+ *
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *
+ * The logic in this file was developed by Gary S. Brown:
+ *
+ *   COPYRIGHT (C) 1986 Gary S. Brown.  You may use this program, or code or tables
+ *   extracted from it, as desired without restriction.
+ *
+ * First, the polynomial itself and its table of feedback terms.  The polynomial is:
+ *
+ *    X^32+X^26+X^23+X^22+X^16+X^12+X^11+X^10+X^8+X^7+X^5+X^4+X^2+X^1+X^0
+ *
+ * Note that we take it "backwards" and put the highest-order term in the lowest-order bit.
+ * The X^32 term is "implied"; the LSB is the X^31 term, etc.  The X^0 term (usually shown
+ * as "+1") results in the MSB being 1
+ *
+ * Note that the usual hardware shift register implementation, which is what we're using
+ * (we're merely optimizing it by doing eight-bit chunks at a time) shifts bits into the
+ * lowest-order term.  In our implementation, that means shifting towards the right.  Why
+ * do we do it this way?  Because the calculated CRC must be transmitted in order from
+ * highest-order term to lowest-order term.  UARTs transmit characters in order from LSB
+ * to MSB.  By storing the CRC this way we hand it to the UART in the order low-byte to
+ * high-byte; the UART sends each low-bit to hight-bit; and the result is transmission bit
+ * by bit from highest- to lowest-order term without requiring any bit shuffling on our
+ * part.  Reception works similarly
+ *
+ * The feedback terms table consists of 256, 32-bit entries.  Notes
+ *
+ * - The table can be generated at runtime if desired; code to do so is shown later.  It
+ *   might not be obvious, but the feedback terms simply represent the results of eight
+ *   shift/xor operations for all combinations of data and CRC register values
+ *
+ * - The values must be right-shifted by eight bits by the updcrc logic; the shift must
+ *   be u_(bring in zeroes).  On some hardware you could probably optimize the shift in
+ *   assembler by using byte-swap instructions polynomial $edb88320
+  ************************************************************************************************/
+
+/************************************************************************************************
+ * Included Files
+ ************************************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+#include <crc32.h>
+
+/************************************************************************************************
+ * Private Data
+ ************************************************************************************************/
+ 
+static const uint32_t crc32_tab[] =
+{
+  0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
+  0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
+  0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
+  0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
+  0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
+  0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
+  0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
+  0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
+  0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
+  0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
+  0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
+  0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
+  0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
+  0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
+  0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
+  0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
+  0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
+  0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
+  0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
+  0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
+  0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
+  0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
+  0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
+  0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
+  0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
+  0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
+  0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
+  0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
+  0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
+  0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
+  0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
+  0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
+};
+
+/************************************************************************************************
+ * Public Functions
+ ************************************************************************************************/
+/************************************************************************************************
+ * Name: crc32part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ************************************************************************************************/
+
+uint32_t crc32part(const uint8_t *src, size_t len, uint32_t crc32val)
+{
+  size_t i;
+
+  for (i = 0;  i < len;  i++)
+    {
+      crc32val = crc32_tab[(crc32val ^ src[i]) & 0xff] ^ (crc32val >> 8);
+    }
+  return crc32val;
+}
+
+/************************************************************************************************
+ * Name: crc32
+ *
+ * Description:
+ *   Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ************************************************************************************************/
+
+uint32_t crc32(const uint8_t *src, size_t len)
+{
+  return crc32part(src, len, 0);
+}
diff --git a/apps/system/zmodem/host/crc32.h b/apps/system/zmodem/host/crc32.h
new file mode 100644
index 000000000..b73e62e6c
--- /dev/null
+++ b/apps/system/zmodem/host/crc32.h
@@ -0,0 +1,83 @@
+/****************************************************************************
+ * apps/system/zmodem/host/crc16.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_CRC32_H
+#define __APPS_SYSTEM_ZMODEM_HOST_CRC32_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <sys/types.h>
+#include <stdint.h>
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#ifdef __cplusplus
+#define EXTERN extern "C"
+extern "C"
+{
+#else
+#define EXTERN extern
+#endif
+
+/****************************************************************************
+ * Name: crc32part
+ *
+ * Description:
+ *   Continue CRC calculation on a part of the buffer.
+ *
+ ****************************************************************************/
+
+uint32_t crc32part(const uint8_t *src, size_t len, uint32_t crc32val);
+
+/****************************************************************************
+ * Name: crc32
+ *
+ * Description:
+ *   Return a 32-bit CRC of the contents of the 'src' buffer, length 'len'
+ *
+ ****************************************************************************/
+
+uint32_t crc32(const uint8_t *src, size_t len);
+
+#undef EXTERN
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_CRC32_H */
diff --git a/apps/system/zmodem/host/debug.h b/apps/system/zmodem/host/debug.h
new file mode 100644
index 000000000..de9194f79
--- /dev/null
+++ b/apps/system/zmodem/host/debug.h
@@ -0,0 +1,69 @@
+/****************************************************************************
+ * apps/system/zmodem/host/debug.h
+ *
+ *   Copyright (C) 2007-2011, 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_DEBUG_H
+#define __APPS_SYSTEM_ZMODEM_HOST_DEBUG_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+
+#ifdef CONFIG_HAVE_FUNCTIONNAME
+# define EXTRA_FMT "%s: "
+# define EXTRA_ARG ,__FUNCTION__
+#else
+# define EXTRA_FMT
+# define EXTRA_ARG
+#endif
+
+/****************************************************************************
+ * Public Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_DEBUG_H */
diff --git a/apps/system/zmodem/host/nuttx/ascii.h b/apps/system/zmodem/host/nuttx/ascii.h
new file mode 100644
index 000000000..19bde9242
--- /dev/null
+++ b/apps/system/zmodem/host/nuttx/ascii.h
@@ -0,0 +1,202 @@
+/****************************************************************************
+ * apps/system/zmodem/host/ascii.h
+ * ASCII Control Codes
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_NUTTX_ASCII_H
+#define __APPS_SYSTEM_ZMODEM_HOST_NUTTX_ASCII_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+/* All 7-bit ASCII codes */
+
+#define ASCII_NUL        0x00 /* Null character (^@) */
+#define ASCII_SOH        0x01 /* Start of header (^A) */
+#define ASCII_STX        0x02 /* Start of tex (^B) */
+#define ASCII_ETX        0x03 /* End of text (^C) */
+#define ASCII_EOT        0x04 /* End of transmission (^D) */
+#define ASCII_ENQ        0x05 /* Enquiry (^E) */
+#define ASCII_ACK        0x06 /* Acknowledge (^F) */
+#define ASCII_BEL        0x07 /* Bell (^G) */
+#define ASCII_BS         0x08 /* Backspace (^H) */
+#define ASCII_TAB        0x09 /* Horizontal tab (^I) */
+#define ASCII_LF         0x0a /* Line Feed (^J) */
+#define ASCII_VT         0x0b /* Vertical tab(^K) */
+#define ASCII_FF         0x0c /* Form Feed (^L) */
+#define ASCII_CR         0x0d /* Carriage Return (^M) */
+#define ASCII_SO         0x0e /* Shift Out (^N) */
+#define ASCII_SI         0x0f /* Shift In (^O) */
+
+#define ASCII_DLE        0x10 /* Data link escape (^P) */
+#define ASCII_DC1        0x11 /* Device control 1, XON (^Q) */
+#define ASCII_XON        ASCII_DC1
+#define ASCII_DC2        0x12 /* Device control 2, block-mode flow control (^R) */
+#define ASCII_DC3        0x13 /* Device control 3, XOFF (^S) */
+#define ASCII_XOFF       ASCII_DC3
+#define ASCII_DC4        0x14 /* Device control 4  (^T) */
+#define ASCII_NAK        0x15 /* Negative acknowledge (^U) */
+#define ASCII_SYN        0x16 /* Synchronous idle (^V) */
+#define ASCII_ETB        0x17 /* End transmission block(^W) */
+#define ASCII_CAN        0x18 /* Cancel line(^X) */
+#define ASCII_EM         0x19 /* End of medium(^Y) */
+#define ASCII_SUB        0x1a /* Substitute (^Z) */
+#define ASCII_ESC        0x1b /* Escape (^[) */
+#define ASCII_FS         0x1c /* File separator (^\) */
+#define ASCII_GS         0x1d /* Group separator (^]) */
+#define ASCII_RS         0x1e /* Record separator, block-mode terminator (^^) */
+#define ASCII_US         0x1f /* Unit separator (^_) */
+
+#define ASCII_SPACE      0x20 /* Space ( ) */
+#define ASCII_EXCLAM     0x21 /* Exclamation mark (!) */
+#define ASCII_QUOTE      0x22 /* Quotation mark (") */
+#define ASCII_NUMBER     0x23 /* Number sign (#) */
+#define ASCII_HASH       0x23 /* Hash (#) */
+#define ASCII_DOLLAR     0x24 /* Dollar sign ($) */
+#define ASCII_PERCENT    0x25 /* Percent sign (%) */
+#define ASCII_AMPERSAND  0x26 /* Ampersand (&) */
+#define ASCII_RSQUOTE    0x27 /* Closing single quote (') */
+#define ASCII_APOSTROPHE 0x27 /* Apostrophe (') */
+#define ASCII_LPAREN     0x28 /* Opening parenthesis (() */
+#define ASCII_RPAREN     0x29 /* Closing parenthesis ()) */
+#define ASCII_ASTERISK   0x2a /* Asterisk (*) */
+#define ASCII_PLUS       0x2b /* Plus sign (+) */
+#define ASCII_COMMA      0x2c /* Comma (,) */
+#define ASCII_HYPHEN     0x2d /* Hyphen (-) */
+#define ASCII_DASH       0x2d /* Dash (-) */
+#define ASCII_MINUS      0x2d /* Minus sign (-) */
+#define ASCII_PERIOD     0x2e /* Period (.) */
+#define ASCII_SLASH      0x2f /* Forward Slash (/) */
+#define ASCII_DIVIDE     0x2f /* Divide (/) */
+
+#define ASCII_0          0x30 /* Numbers */
+#define ASCII_1          0x31 /* "     " */
+#define ASCII_2          0x32 /* "     " */
+#define ASCII_3          0x33 /* "     " */
+#define ASCII_4          0x34 /* "     " */
+#define ASCII_5          0x35 /* "     " */
+#define ASCII_6          0x36 /* "     " */
+#define ASCII_7          0x37 /* "     " */
+#define ASCII_8          0x38 /* "     " */
+#define ASCII_9          0x39 /* "     " */
+#define ASCII_COLON      0x3a /* Colon (:) */
+#define ASCII_SEMICOLON  0x3b /* Semicolon (;) */
+#define ASCII_LT         0x3c /* Less than (<) */
+#define ASCII_EQUAL      0x3d /* Equal (=) */
+#define ASCII_GT         0x3e /* Greater than (>) */
+#define ASCII_QUESTION   0x3f /* Question mark (?) */
+
+#define ASCII_AT         0x40 /* At sign (@) */
+#define ASCII_A          0x41 /* Upper case letters */
+#define ASCII_B          0x42 /* "   " "  " "     " */
+#define ASCII_C          0x43 /* "   " "  " "     " */
+#define ASCII_D          0x44 /* "   " "  " "     " */
+#define ASCII_E          0x45 /* "   " "  " "     " */
+#define ASCII_F          0x46 /* "   " "  " "     " */
+#define ASCII_G          0x47 /* "   " "  " "     " */
+#define ASCII_H          0x48 /* "   " "  " "     " */
+#define ASCII_I          0x49 /* "   " "  " "     " */
+#define ASCII_J          0x4a /* "   " "  " "     " */
+#define ASCII_K          0x4b /* "   " "  " "     " */
+#define ASCII_L          0x4c /* "   " "  " "     " */
+#define ASCII_M          0x4d /* "   " "  " "     " */
+#define ASCII_N          0x4e /* "   " "  " "     " */
+#define ASCII_O          0x4f /* "   " "  " "     " */
+
+#define ASCII_P          0x50 /* "   " "  " "     " */
+#define ASCII_Q          0x51 /* "   " "  " "     " */
+#define ASCII_R          0x52 /* "   " "  " "     " */
+#define ASCII_S          0x53 /* "   " "  " "     " */
+#define ASCII_T          0x54 /* "   " "  " "     " */
+#define ASCII_U          0x55 /* "   " "  " "     " */
+#define ASCII_V          0x56 /* "   " "  " "     " */
+#define ASCII_W          0x57 /* "   " "  " "     " */
+#define ASCII_X          0x58 /* "   " "  " "     " */
+#define ASCII_Y          0x59 /* "   " "  " "     " */
+#define ASCII_Z          0x5a /* "   " "  " "     " */
+#define ASCII_LBRACKET   0x5b /* Left bracket ([) */
+#define ASCII_BACKSLASH  0x5c /* Back slash (\) */
+#define ASCII_RBRACKET   0x5d /* Right bracket (]) */
+#define ASCII_CARET      0x5e /* Caret (^) */
+#define ASCII_CIRCUMFLEX 0x5e /* Circumflex (^) */
+#define ASCII_UNDERSCORE 0x5f /* Underscore (_) */
+
+#define ASCII_RSQUOT     0x60 /* Closing single quote */
+#define ASCII_a          0x61 /* Lower case letters */
+#define ASCII_b          0x62 /* "   " "  " "     " */
+#define ASCII_c          0x63 /* "   " "  " "     " */
+#define ASCII_d          0x64 /* "   " "  " "     " */
+#define ASCII_e          0x65 /* "   " "  " "     " */
+#define ASCII_f          0x66 /* "   " "  " "     " */
+#define ASCII_g          0x67 /* "   " "  " "     " */
+#define ASCII_h          0x68 /* "   " "  " "     " */
+#define ASCII_i          0x69 /* "   " "  " "     " */
+#define ASCII_j          0x6a /* "   " "  " "     " */
+#define ASCII_k          0x6b /* "   " "  " "     " */
+#define ASCII_l          0x6c /* "   " "  " "     " */
+#define ASCII_m          0x6d /* "   " "  " "     " */
+#define ASCII_n          0x6e /* "   " "  " "     " */
+#define ASCII_o          0x6f /* "   " "  " "     " */
+
+#define ASCII_p          0x70 /* "   " "  " "     " */
+#define ASCII_q          0x71 /* "   " "  " "     " */
+#define ASCII_r          0x72 /* "   " "  " "     " */
+#define ASCII_s          0x73 /* "   " "  " "     " */
+#define ASCII_t          0x74 /* "   " "  " "     " */
+#define ASCII_u          0x75 /* "   " "  " "     " */
+#define ASCII_v          0x76 /* "   " "  " "     " */
+#define ASCII_w          0x77 /* "   " "  " "     " */
+#define ASCII_x          0x78 /* "   " "  " "     " */
+#define ASCII_y          0x79 /* "   " "  " "     " */
+#define ASCII_z          0x7a /* "   " "  " "     " */
+#define ASCII_LBRACE     0x7b /* Left brace ({) */
+#define ASCII_VERTBAR    0x7c /* Vertical bar (|) */
+#define ASCII_PIPE       0x7c /* Pipe (|) */
+#define ASCII_RBRACE     0x7d /* Right brace (}) */
+#define ASCII_TILDE      0x7e /* Tilde (~) */
+#define ASCII_DEL        0x7f /* Delete (rubout) */
+
+/****************************************************************************
+ * Public Data
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_NUTTX_ASCII_H */
diff --git a/apps/system/zmodem/host/nuttx/compiler.h b/apps/system/zmodem/host/nuttx/compiler.h
new file mode 100644
index 000000000..ed80571e2
--- /dev/null
+++ b/apps/system/zmodem/host/nuttx/compiler.h
@@ -0,0 +1,167 @@
+/****************************************************************************
+ * include/nuttx/compiler.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_NUTTX_COMPILER_H
+#define __APPS_SYSTEM_ZMODEM_HOST_NUTTX_COMPILER_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/* GCC-specific definitions *************************************************/
+
+#ifdef __GNUC__
+
+/* Pre-processor */
+
+# define CONFIG_CPP_HAVE_VARARGS 1 /* Supports variable argument macros */
+# define CONFIG_CPP_HAVE_WARNING 1 /* Supports #warning */
+
+/* Intriniscs */
+
+# define CONFIG_HAVE_FUNCTIONNAME 1 /* Has __FUNCTION__ */
+# define CONFIG_HAVE_FILENAME     1 /* Has __FILE__ */
+
+/* Attributes
+ *
+ * GCC supports weak symbols which can be used to reduce code size because
+ * unnecessary "weak" functions can be excluded from the link.
+ */
+
+# ifndef __CYGWIN__
+#  define CONFIG_HAVE_WEAKFUNCTIONS 1
+#  define weak_alias(name, aliasname) \
+   extern __typeof (name) aliasname __attribute__ ((weak, alias (#name)));
+#  define weak_function __attribute__ ((weak))
+#  define weak_const_function __attribute__ ((weak, __const__))
+# else
+#  undef  CONFIG_HAVE_WEAKFUNCTIONS
+#  define weak_alias(name, aliasname)
+#  define weak_function
+#  define weak_const_function
+# endif
+
+/* The noreturn attribute informs GCC that the function will not return. */
+
+# define noreturn_function __attribute__ ((noreturn))
+
+/* The farcall_function attribute informs GCC that is should use long calls
+ * (even though -mlong-calls does not appear in the compilation options)
+ */
+
+# define farcall_function __attribute__ ((long_call))
+
+/* The packed attribute informs GCC that the stucture elements are packed,
+ * ignoring other alignment rules.
+ */
+
+# define packed_struct __attribute__ ((packed))
+
+/* GCC does not support the reentrant attribute */
+
+# define reentrant_function
+
+/* The naked attribute informs GCC that the programmer will take care of
+ * the function prolog and epilog.
+ */
+
+# define naked_function __attribute__ ((naked,no_instrument_function))
+ 
+/* The inline_function attribute informs GCC that the function should always
+ * be inlined, regardless of the level of optimization.  The noinline_function
+ * indicates that the function should never be inlined.
+ */
+
+# define inline_function __attribute__ ((always_inline))
+# define noinline_function __attribute__ ((noinline))
+
+/* GCC has does not use storage classes to qualify addressing */
+
+# define FAR
+# define NEAR
+# define DSEG
+# define CODE
+
+/* Unknown compiler *********************************************************/
+
+#else
+
+# undef  CONFIG_CPP_HAVE_VARARGS
+# undef  CONFIG_CPP_HAVE_WARNING
+# undef  CONFIG_HAVE_FUNCTIONNAME
+# undef  CONFIG_HAVE_FILENAME
+# undef  CONFIG_HAVE_WEAKFUNCTIONS
+# define weak_alias(name, aliasname)
+# define weak_function
+# define weak_const_function
+# define noreturn_function
+# define farcall_function
+# define packed_struct
+# define reentrant_function
+# define naked_function
+# define inline_function
+# define noinline_function
+
+# define FAR
+# define NEAR
+# define DSEG
+# define CODE
+
+# undef  CONFIG_SMALL_MEMORY
+# undef  CONFIG_LONG_IS_NOT_INT
+# undef  CONFIG_PTR_IS_NOT_INT
+# undef  CONFIG_HAVE_INLINE
+# define inline 1
+# undef  CONFIG_HAVE_LONG_LONG
+# define CONFIG_HAVE_FLOAT 1
+# undef  CONFIG_HAVE_DOUBLE
+# undef  CONFIG_HAVE_LONG_DOUBLE
+# undef  CONFIG_CAN_PASS_STRUCTS
+
+#endif
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Function Prototypes
+ ****************************************************************************/
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_NUTTX_COMPILER_H */
diff --git a/apps/system/zmodem/host/nuttx/config.h b/apps/system/zmodem/host/nuttx/config.h
new file mode 100644
index 000000000..002a60d55
--- /dev/null
+++ b/apps/system/zmodem/host/nuttx/config.h
@@ -0,0 +1,91 @@
+/****************************************************************************
+ * include/nuttx/compiler.h
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 __APPS_SYSTEM_ZMODEM_HOST_NUTTX_CONFIG_H
+#define __APPS_SYSTEM_ZMODEM_HOST_NUTTX_CONFIG_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdlib.h>
+#include <string.h>
+
+/****************************************************************************
+ * Pre-processor Definitions
+ ****************************************************************************/
+/* Environment stuff */
+
+#define OK 0
+#define ERROR -1
+#define FAR
+#define DEBUGASSERT assert
+
+/* Configuration */
+
+#define CONFIG_SYSTEM_ZMODEM_DEVNAME "/dev/ttyS0"
+#define CONFIG_SYSTEM_ZMODEM_RCVBUFSIZE 512
+#define CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE 1024
+#define CONFIG_SYSTEM_ZMODEM_SNDBUFSIZE 512
+#define CONFIG_SYSTEM_ZMODEM_MOUNTPOINT "/tmp"
+#undef CONFIG_SYSTEM_ZMODEM_RCVSAMPLE
+#undef CONFIG_SYSTEM_ZMODEM_SENDATTN
+#define CONFIG_SYSTEM_ZMODEM_RESPTIME 10
+#define CONFIG_SYSTEM_ZMODEM_CONNTIME 30
+#define CONFIG_SYSTEM_ZMODEM_SERIALNO 1
+#define CONFIG_SYSTEM_ZMODEM_MAXERRORS 20
+#define CONFIG_SYSTEM_ZMODEM_WRITESIZE 0
+#define CONFIG_SYSTEM_ZMODEM_MOUNTPOINT "/tmp"
+
+/* Cannot control pre-emption from Linux (don't need to) */
+
+#define sched_lock()
+#define sched_unlock()
+
+/****************************************************************************
+ * Inline Functions
+ ****************************************************************************/
+
+static inline void *zalloc(unsigned long size)
+{
+  void *ret = malloc(size);
+  if (ret)
+    {
+      memset(ret, 0, size);
+    }
+  return ret;
+}
+
+#endif /* __APPS_SYSTEM_ZMODEM_HOST_NUTTX_CONFIG_H */
diff --git a/apps/system/zmodem/zm.h b/apps/system/zmodem/zm.h
index d025e94ef..ec653d796 100644
--- a/apps/system/zmodem/zm.h
+++ b/apps/system/zmodem/zm.h
@@ -50,6 +50,7 @@
 #include <stdint.h>
 #include <debug.h>
 
+#include <nuttx/compiler.h>
 #include <nuttx/ascii.h>
 
 #include <apps/zmodem.h>
diff --git a/apps/system/zmodem/zm_send.c b/apps/system/zmodem/zm_send.c
index f93a90304..df8e8414f 100644
--- a/apps/system/zmodem/zm_send.c
+++ b/apps/system/zmodem/zm_send.c
@@ -1065,8 +1065,8 @@ static int zms_sendpacket(FAR struct zm_state_s *pzm)
 
       /* And send the packet */
 
-      dbg("Sending %d bytes. New offset: %ld\n",
-          pktsize, (unsigned long)pzms->offset);
+      zmdbg("Sending %d bytes. New offset: %ld\n",
+            pktsize, (unsigned long)pzms->offset);
 
       nwritten = zm_remwrite(pzm->remfd, pzm->scratch, pktsize);
       if (nwritten < 0)
diff --git a/nuttx/configs/olimex-lpc1766stk/zmodem/defconfig b/nuttx/configs/olimex-lpc1766stk/zmodem/defconfig
index 6fabe918d..789ef197b 100644
--- a/nuttx/configs/olimex-lpc1766stk/zmodem/defconfig
+++ b/nuttx/configs/olimex-lpc1766stk/zmodem/defconfig
@@ -799,9 +799,8 @@ CONFIG_SYSTEM_ZMODEM_PKTBUFSIZE=1024
 CONFIG_SYSTEM_ZMODEM_SNDBUFSIZE=512
 CONFIG_SYSTEM_ZMODEM_MOUNTPOINT="/mnt/sdcard"
 # CONFIG_SYSTEM_ZMODEM_RCVSAMPLE is not set
-CONFIG_SYSTEM_ZMODEM_SENDATTN=y
+# CONFIG_SYSTEM_ZMODEM_SENDATTN is not set
 CONFIG_SYSTEM_ZMODEM_ALWAYSSINT=y
-# CONFIG_SYSTEM_ZMODEM_FULLSTREAMING is not set
 # CONFIG_SYSTEM_ZMODEM_SENDBRAK is not set
 CONFIG_SYSTEM_ZMODEM_RESPTIME=10
 CONFIG_SYSTEM_ZMODEM_SERIALNO=0