1 files changed, 121 insertions, 0 deletions
diff --git a/nuttx/tools/b16.c b/nuttx/tools/b16.c
new file mode 100644
index 000000000..66d581ffa
--- /dev/null
+++ b/nuttx/tools/b16.c
@@ -0,0 +1,121 @@
+/****************************************************************************
+ * tools/b16.c
+ *
+ *   Copyright (C) 2007-2012 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+static void show_usage(const char *progname)
+{
+  fprintf(stderr, "\nUSAGE: %s <b16_t>|<float>\n", progname);
+  fprintf(stderr, "\nWhere:\n");
+  fprintf(stderr, "  <b16_t>:\n");
+  fprintf(stderr, "    A b16 fixed precision value in hexadecimal form: E.g., 0x00010000\n");
+  fprintf(stderr, "    Any value begininning with '0' will assumed by be hexadecimal format\n");
+  fprintf(stderr, "  <float>:\n");
+  fprintf(stderr, "    A floating value in standard form: E.g., 5.1\n");
+  exit(EXIT_FAILURE);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+int main(int argc, char **argv, char **envp)
+{
+  double fvalue;
+  unsigned long ulvalue;
+  long lvalue;
+  const char *str;
+  char *endptr;
+
+  /* There must be exactly one argument */
+
+  if (argc != 2)
+    {
+      fprintf(stderr, "\nExpected a single argument\n");
+      show_usage(argv[0]);
+    }
+  str = argv[1];
+
+  /* If the value begins with a zero, we will assume that it is a hexadecimal
+   * representation.
+   */
+
+  if (str[0] == '0')
+    {
+      endptr = NULL;
+      ulvalue = strtoul(str, &endptr, 16);
+      if (!endptr || *endptr != '\0')
+        {
+          fprintf(stderr, "\nHexadecimal argument not fully converted\n");
+          show_usage(argv[0]);
+        }
+
+      if (ulvalue >= 0x80000000)
+        {
+          lvalue = ~ulvalue + 1;
+        }
+      else
+        {
+          lvalue = ulvalue;
+        }
+
+      fvalue = ((double)lvalue) / 65536.0;
+      printf("0x%08lx -> %10.5f\n", ulvalue, fvalue);
+    }
+  else
+    {
+      endptr = NULL;
+      fvalue = strtod(str, &endptr);
+      if (!endptr || *endptr != '\0')
+        {
+          fprintf(stderr, "\nFloating point argument not fully converted\n");
+          show_usage(argv[0]);
+        }
+
+      lvalue = 65536.0 * fvalue;
+      printf("%10.5f -> 0x%08lx\n", fvalue, lvalue);
+    }
+   
+  return 0;
+}