From 5e23e42a0d5f7256bb284bdd8ffbe7b52eef0cef Mon Sep 17 00:00:00 2001
From: Gregory Nutt <gnutt@nuttx.org>
Date: Sun, 26 May 2013 09:28:57 -0600
Subject: Extentions SCLD test; SCLD CODEC and LCD1602 driver bug fixes

---
 nuttx/libc/misc/lib_slcddecode.c | 36 +++++++++++++++++++++++++++++++++++-
 nuttx/libc/misc/lib_slcdencode.c |  2 +-
 2 files changed, 36 insertions(+), 2 deletions(-)

(limited to 'nuttx/libc')

diff --git a/nuttx/libc/misc/lib_slcddecode.c b/nuttx/libc/misc/lib_slcddecode.c
index 97fa951c8..79c549b39 100644
--- a/nuttx/libc/misc/lib_slcddecode.c
+++ b/nuttx/libc/misc/lib_slcddecode.c
@@ -52,6 +52,21 @@
 /****************************************************************************
  * Pre-Processor Definitions
  ****************************************************************************/
+/* Configuration ************************************************************/
+/* Define CONFIG_DEBUG_LCD to enable detailed LCD debug output. Verbose
+ * debug must also be enabled.
+ */
+
+#ifndef CONFIG_DEBUG
+#  undef CONFIG_DEBUG_VERBOSE
+#  undef CONFIG_DEBUG_LCD
+#endif
+
+#ifndef CONFIG_DEBUG_VERBOSE
+#  undef CONFIG_DEBUG_LCD
+#endif
+
+/* Indices, counts, helper macros ******************************************/
 
 #define NDX_ESC        0
 #define NDX_BRACKET    1
@@ -74,6 +89,16 @@
 #define IS_CODE(a)     (((a) >= CODE_MIN) && ((a) <= CODE_MAX))
 #define CODE_RETURN(a) (enum slcdcode_e)((a) - 'A')
 
+/* Debug ********************************************************************/
+
+#ifdef CONFIG_DEBUG_LCD
+#  define lcddbg         dbg
+#  define lcdvdbg        vdbg
+#else
+#  define lcddbg(x...)
+#  define lcdvdbg(x...)
+#endif
+
 /****************************************************************************
  * Private Functions
  ****************************************************************************/
@@ -239,6 +264,7 @@ enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
        * return the following characters later.
        */
 
+      lcddbg("Parsing failed: ESC followed by %02x\n", ch);
       return slcd_reget(state, pch, parg);
     }
 
@@ -269,6 +295,8 @@ enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
 
       if (code < (int)FIRST_SLCDCODE || code > (int)LAST_SLCDCODE)
         {
+          lcddbg("Parsing failed: ESC-L followed by %02x\n", ch);
+
           /* Not a special command code.. put the character in the reget
            * buffer.
            */
@@ -310,6 +338,9 @@ enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
            * following characters later.
            */
 
+          lcddbg("Parsing failed: ESC-L-%c followed by %02x\n",
+                 state->buf[NDX_COUNTH], ch);
+
           return slcd_reget(state, pch, parg);
         }
 
@@ -342,7 +373,7 @@ enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
        */
 
       code  = CODE_RETURN(ch);
-      count = slcd_nibble(state->buf[NDX_COUNTH]) << 4;
+      count = slcd_nibble(state->buf[NDX_COUNTH]) << 4 |
               slcd_nibble(state->buf[NDX_COUNTL]);
 
       /* Verify the special CLCD action code */
@@ -353,6 +384,9 @@ enum slcdret_e slcd_decode(FAR struct lib_instream_s *stream,
            * of the characters later.
            */
 
+          lcddbg("Parsing failed: ESC-L-%c-%c followed by %02x, count=%d\n",
+                 state->buf[NDX_COUNTH], state->buf[NDX_COUNTL], ch, count);
+
           return slcd_reget(state, pch, parg);
         }
     }
diff --git a/nuttx/libc/misc/lib_slcdencode.c b/nuttx/libc/misc/lib_slcdencode.c
index 148cb3a99..12454ca8e 100644
--- a/nuttx/libc/misc/lib_slcdencode.c
+++ b/nuttx/libc/misc/lib_slcdencode.c
@@ -70,7 +70,7 @@ static uint8_t slcd_nibble(uint8_t binary)
 {
   binary &= 0x0f;
 
-  if (binary > 9)
+  if (binary <= 9)
     {
       return '0' + binary;
     }
-- 
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