readline() (and hence NSH) now accept the DEL character as well as the Backspace character for the backspace functionality

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@4428 7fd9a85b-ad96-42d3-883c-3090e2eb8679

apps/ChangeLog.txt

@@ -192,3 +192,7 @@
 	* apps/examples/qencoder:  Add a quadrature driver test.
 	* apps/examples/ostest/fpu.c:  Add a test to verify that FPU registers
 	  are properly saved and restored on context switches.
+	* apps/system/readline/readline.c:  readline() will now treat either a
+	  backspace or a DEL character as a backspace (i.e., deleting the character
+	  to the left of the cursor).  This makes NSH less dependent on particular
+	  keyboard mappings of the Backspace key.  Submitted by Mike Smith.

apps/system/readline/readline.c

@@ -68,6 +68,13 @@
 #undef  CONFIG_EOL_IS_BOTH_CRLF
 #define CONFIG_EOL_IS_EITHER_CRLF 1
 
+/* Some special characters */
+
+#define BS       0x08 /* Backspace */
+#define ESC      0x1b /* Escape */
+#define LBRACKET 0x5b /* Left bracket */
+#define DEL      0x7f /* DEL */
+
 /****************************************************************************
  * Private Type Declarations
  ****************************************************************************/
@@ -219,7 +226,7 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream)
         {
           /* Yes, is it an <esc>[, 3 byte sequence */
 
-          if (ch != 0x5b || escape == 2)
+          if (ch != LBRACKET || escape == 2)
             {
               /* We are finished with the escape sequence */
 
@@ -238,9 +245,16 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream)
             }
         }
 
-      /* Check for backspace */
+      /* Check for backspace
+       *
+       * There are several notions of backspace, for an elaborate summary see
+       * http://www.ibb.net/~anne/keyboard.html. There is no clean solution.
+       * Here both DEL and backspace are treated like backspace here.  The
+       * Unix/Linux screen terminal by default outputs  DEL (0x7f) when the
+       * backspace key is pressed.
+       */
 
-      else if (ch == 0x08)
+      else if (ch == BS || ch == DEL)
         {
           /* Eliminate that last character in the buffer. */
 
@@ -249,9 +263,12 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream)
               nch--;
 
 #ifdef CONFIG_READLINE_ECHO
-              /* Echo the backspace character on the console */
+              /* Echo the backspace character on the console.  Always output
+               * the backspace character because the VT100 terminal doesn't
+               * understand DEL properly.
+               */
 
-              readline_consoleputc(ch, outfd);
+              readline_consoleputc(BS, outfd);
               readline_consoleputs(g_erasetoeol, outfd);
 #endif
             }
@@ -259,7 +276,7 @@ ssize_t readline(FAR char *buf, int buflen, FILE *instream, FILE *outstream)
 
       /* Check for the beginning of a VT100 escape sequence */
 
-      else if (ch == 0x1b)
+      else if (ch == ESC)
         {
           /* The next character is escaped */
 

nuttx/ChangeLog

@@ -2506,3 +2506,5 @@
 	  submitted by Max Nekludov.
 	* arch/arm/src/armv7-m/up_fpu.S and arch/arm/src/stm32/stm32_vectors.S:  Fix
 	  lazy FPU register saving with CONFIG_ARCH_FPU is set in the configuration.
+	* arch/arm/src/armv7-m:  Lazy saving of floating point registers on context
+	  switches now seems to be functional.

nuttx/configs/stm3240g-eval/README.txt

@@ -909,8 +909,28 @@ Where <subdir> is one of the following:
     examples/ostest.  By default, this project assumes that you are
     using the DFU bootloader.
 
-    CONFIG_STM32_CODESOURCERYW=y  : CodeSourcery under Windows
+      CONFIG_STM32_CODESOURCERYW=y  : CodeSourcery under Windows
 
+    If you use the Atollic toolchain, then the FPU test can be enabled in the
+    examples/ostest by adding the following your NuttX configuration file:
+
+     -CONFIG_ARCH_FPU=n             : Enabled the FPU
+     +CONFIG_ARCH_FPU=y
+
+     -CONFIG_STM32_CODESOURCERYW=y  : Disable CodeSourcery under Windows
+     +CONFIG_STM32_CODESOURCERYL=n
+
+     -CONFIG_STM32_ATOLLIC=y        : Enable the Atollic toolchain
+     +CONFIG_STM32_ATOLLIC=n
+
+     -CONFIG_SCHED_WAITPID=y         : Enable the waitpid() API needed by the FPU test
+     +CONFIG_SCHED_WAITPID=n
+
+    The FPU test also needs to know the size of the FPU registers save area in
+    bytes (see arch/arm/include/armv7-m/irq_lazyfpu.h):
+
+     -CONFIG_EXAMPLES_OSTEST_FPUSIZE=(4*33)
+ 
   telnetd:
   --------
 

nuttx/configs/stm32f4discovery/README.txt

@@ -711,6 +711,27 @@ Where <subdir> is one of the following:
 
     CONFIG_STM32_CODESOURCERYW=y  : CodeSourcery under Windows
 
+
+    If you use the Atollic toolchain, then the FPU test can be enabled in the
+    examples/ostest by adding the following your NuttX configuration file:
+
+     -CONFIG_ARCH_FPU=n             : Enabled the FPU
+     +CONFIG_ARCH_FPU=y
+
+     -CONFIG_STM32_CODESOURCERYW=y  : Disable CodeSourcery under Windows
+     +CONFIG_STM32_CODESOURCERYL=n
+
+     -CONFIG_STM32_ATOLLIC=y        : Enable the Atollic toolchain
+     +CONFIG_STM32_ATOLLIC=n
+
+     -CONFIG_SCHED_WAITPID=y         : Enable the waitpid() API needed by the FPU test
+     +CONFIG_SCHED_WAITPID=n
+
+    The FPU test also needs to know the size of the FPU registers save area in
+    bytes (see arch/arm/include/armv7-m/irq_lazyfpu.h):
+
+     -CONFIG_EXAMPLES_OSTEST_FPUSIZE=(4*33)
+ 
   nsh:
   ---
     Configures the NuttShell (nsh) located at apps/examples/nsh.  The