From 24f3d5c021bfa7d0a99870d363d86e4e17e4ca63 Mon Sep 17 00:00:00 2001
From: patacongo <patacongo@42af7a65-404d-4744-a932-0658087f49c3>
Date: Wed, 26 Dec 2012 21:37:50 +0000
Subject: Verified USB HID KBD driver encoding of special characters;
 apps/examples/hidkbd now decodes encoded keyboar characters.

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5463 42af7a65-404d-4744-a932-0658087f49c3
---
 apps/examples/hidkbd/hidkbd_main.c | 106 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 105 insertions(+), 1 deletion(-)

(limited to 'apps/examples/hidkbd/hidkbd_main.c')

diff --git a/apps/examples/hidkbd/hidkbd_main.c b/apps/examples/hidkbd/hidkbd_main.c
index 8c9f6fa95..8a632bab7 100644
--- a/apps/examples/hidkbd/hidkbd_main.c
+++ b/apps/examples/hidkbd/hidkbd_main.c
@@ -46,10 +46,18 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <sched.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
 #include <errno.h>
 
 #include <nuttx/usb/usbhost.h>
 
+#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
+#  include <nuttx/streams.h>
+#  include <nuttx/input/kbd_codec.h>
+#endif
+
 /****************************************************************************
  * Definitions
  ****************************************************************************/
@@ -83,10 +91,23 @@
 #  define CONFIG_EXAMPLES_HIDKBD_DEVNAME "/dev/kbda"
 #endif
 
+#if !defined(CONFIG_HIDKBD_ENCODED) || !defined(CONFIG_LIB_KBDCODEC)
+#  undef CONFIG_EXAMPLES_HIDKBD_ENCODED
+#endif
+
 /****************************************************************************
  * Private Types
  ****************************************************************************/
 
+#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
+struct hidbkd_instream_s
+{
+  struct lib_instream_s stream;
+  FAR char *buffer;
+  ssize_t nbytes;
+};
+#endif
+
 /****************************************************************************
  * Private Data
  ****************************************************************************/
@@ -98,9 +119,84 @@ static struct usbhost_driver_s *g_drvr;
  ****************************************************************************/
 
 /****************************************************************************
- * Public Functions
+ * Name: hidkbd_getstream
+ *
+ * Description:
+ *   Get one character from the keyboard.
+ *
  ****************************************************************************/
 
+#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
+static int hidkbd_getstream(FAR struct lib_instream_s *this)
+{
+  FAR struct hidbkd_instream_s *kbdstream = (FAR struct hidbkd_instream_s *)this;
+
+  DEBUGASSERT(kbdstream && kbdstream->buffer);
+  if (kbdstream->nbytes > 0)
+    {
+      kbdstream->nbytes--;
+      kbdstream->stream.nget++;
+      return (int)*kbdstream->buffer++;
+    }
+
+  return EOF;
+}
+#endif
+
+/****************************************************************************
+ * Name: hidkbd_decode
+ *
+ * Description:
+ *   Decode encoded keyboard input
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
+static void hidkbd_decode(FAR char *buffer, ssize_t nbytes)
+{
+  struct hidbkd_instream_s kbdstream;
+  struct kbd_getstate_s state;
+  uint8_t ch;
+  int ret;
+
+  /* Initialize */
+
+  memset(&state, 0, sizeof(struct kbd_getstate_s));
+  kbdstream.stream.get  = hidkbd_getstream;
+  kbdstream.stream.nget = 0;
+  kbdstream.buffer      = buffer;
+  kbdstream.nbytes      = nbytes;
+
+  /* Loop until all of the bytes have been consumed.  We implicitly assume
+   * that the the escaped sequences do not cross buffer boundaries.  That
+   * might be true if the read buffer were small or the data rates high.
+   */
+
+  for (;;)
+    {
+      /* Decode the next thing from the buffer */
+
+      ret = kbd_get((FAR struct lib_instream_s *)&kbdstream, &state, &ch);
+      if (ret == KBD_ERROR)
+        {
+          break;
+        }
+
+      /* Normal data?  Or special key? */
+
+      if (ret == KBD_NORMAL)
+        {
+          printf("Data:   %c [%02x]\n", isprint(ch) ? ch : '.', ch);
+        }
+      else
+        {
+          DEBUGASSERT(ret == KBD_SPECIAL);
+          printf("Special: %d\n", ch);
+        }
+    }
+}
+#endif
+
 /****************************************************************************
  * Name: hidkbd_waiter
  *
@@ -140,6 +236,10 @@ static int hidkbd_waiter(int argc, char *argv[])
   return 0;
 }
 
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
 /****************************************************************************
  * Name: hidkbd_main
  ****************************************************************************/
@@ -217,7 +317,11 @@ int hidkbd_main(int argc, char *argv[])
                 {
                   /* On success, echo the buffer to stdout */
 
+#ifdef CONFIG_EXAMPLES_HIDKBD_ENCODED
+                  hidkbd_decode(buffer, nbytes);
+#else
                   (void)write(1, buffer, nbytes);
+#endif
                 }
             }
           while (nbytes > 0);
-- 
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