Fixed 8051 printf bug

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@57 42af7a65-404d-4744-a932-0658087f49c3

arch/pjrc-8051/README.txt

@@ -21,7 +21,10 @@ compatible with this build.  First start with the usual steps
   ./configure
   make
 
-But before installing,
+But before installing, we need to apply a patch to the SDCC 2.6.0 source.
+WARNING:  This patch is specific to the particular combination of CFLAGS
+that are used in the compilation.  If you change Make.defs, then you will
+likely have to change the patch as well.
 
   Apply sdcc-2.6.0.patch
   cd sdcc/device/lib

arch/pjrc-8051/defconfig

@@ -40,7 +40,8 @@
 # CONFIG_PJRC_LEDS - Use LEDs to show state. Unique to 8051.
 #
 CONFIG_ARCH=pjrc-8051
-CONFIG_ARCH_8051=y
+CONFIG_ARCH_8052=y
+CONFIG_ARCH_PJRC=y
 CONFIG_8051_LEDS=n
 
 #

arch/pjrc-8051/include/arch.h

@@ -67,6 +67,13 @@ extern "C" {
 #define EXTERN extern
 #endif
 
+/* The 805x family has a tiny, 256 stack and can be easily
+ * overflowed. The following macro can be used to instrument
+ * code to dump the stack pointer at critical locations.
+ */
+
+EXTERN void up_showsp(ubyte ch) __naked;
+
 #undef EXTERN
 #ifdef __cplusplus
 }

arch/pjrc-8051/include/irq.h

@@ -44,6 +44,8 @@
  * Included Files
  ************************************************************/
 
+#include <nuttx/config.h>
+
 /************************************************************
  * Definitions
  ************************************************************/
@@ -65,7 +67,7 @@
 #define IRAM_BASE    0x0000
 #define IRAM_SIZE    0x0100
 
-#define STACK_BASE   0x0030
+#define STACK_BASE   0x0024
 #define STACK_SIZE   (IRAM_SIZE - STACK_BASE)
 
 /* This is the form of initial stack frame

arch/pjrc-8051/sdcc-2.6.0.patch

+diff -u sdcc/device/lib/Makefile.orig sdcc/device/lib/Makefile
 --- sdcc/device/lib/Makefile.orig	2007-03-06 09:55:01.000000000 -0600
 +++ sdcc/device/lib/Makefile	2007-03-06 09:58:32.000000000 -0600
 @@ -242,7 +242,7 @@
@@ -9,3 +10,19 @@
  	  done \
  	fi
  
+diff -u sdcc/device/include/stdarg.h.orig sdcc/device/include/stdarg.h 
+--- sdcc/device/include/stdarg.h.orig	2007-03-11 13:21:15.000000000 -0600
++++ sdcc/device/include/stdarg.h	2007-03-11 13:26:59.000000000 -0600
+@@ -25,9 +25,9 @@
+ 
+ #else
+ 
+-typedef	unsigned char __data * va_list ;
+-#define va_arg(marker,type) *((type __data * )(marker -= sizeof(type)))
+-#define	va_start(marker,first) { marker = (va_list) ((char __data * )&first); }
++typedef	unsigned char * va_list ;
++#define va_arg(marker,type) *((type * )(marker -= sizeof(type)))
++#define	va_start(marker,first) { marker = (va_list) ((char * )&first); }
+ 
+ #endif
+ 

arch/pjrc-8051/src/up_debug.c

@@ -160,3 +160,28 @@ void up_dumpframe(FAR struct xcptcontext *context)
   _up_dump8(" PSW  ", start[FRAME_PSW]);
 }
 #endif
+
+/************************************************************
+ * Name: up_dumpframe
+ ************************************************************/
+
+/* The 805x family has a tiny, 256 stack and can be easily
+ * overflowed. The following macro can be used to instrument
+ * code to dump the stack pointer at critical locations.
+ */
+
+#ifdef CONFIG_ARCH_PJRC
+void up_showsp(ubyte ch) __naked
+{
+  ch;
+  _asm
+	mov	a, dpl
+	lcall	PM2_ENTRY_COUT
+	mov	a, sp
+	lcall	PM2_ENTRY_PHEX
+	lcall	PM2_ENTRY_NEWLINE
+  _endasm;
+}
+#endif
+
+

arch/pjrc-8051/src/up_initialstate.c

@@ -96,10 +96,7 @@ void up_initial_state(FAR _TCB *tcb)
    frame[FRAME_RETLS] = (((uint16)tcb->start) & 0xff);
    frame[FRAME_RETMS] = (((uint16)tcb->start) >> 8);
 
-  /* Then the context save area which can be indexed with
-   * the following definitions (relative to the beginning of
-   * the initial frame.
-   */
+  /* The context save area follows the return address. */
 
   frame[FRAME_IE]     = 0x80;
   frame[FRAME_PSW]    = 0;

arch/pjrc-8051/src/up_internal.h

@@ -40,7 +40,10 @@
  * Included Files
  **************************************************************************/
 
-#include "pjrc.h"
+#include <nuttx/config.h>
+#ifdef CONFIG_ARCH_PJRC
+# include "pjrc.h"
+#endif
 
 /**************************************************************************
  * Public Definitions

examples/ostest/main.c

@@ -59,21 +59,35 @@
  * Private Data
  ************************************************************/
 
-static FAR char arg1[]    = "Arg1";
-static FAR char arg2[]    = "Arg2";
-static FAR char arg3[]    = "Arg3";
-static FAR char arg4[]    = "Arg4";
+static const char arg1[] = "Arg1";
+static const char arg2[] = "Arg2";
+static const char arg3[] = "Arg3";
+static const char arg4[] = "Arg4";
 
 #if CONFIG_NFILE_DESCRIPTORS > 0
-static char write_data1[] = "Standard I/O Check: write fd=1\n";
-static char write_data2[] = "Standard I/O Check: write fd=2\n";
+static const char write_data1[] = "stdio_test: write fd=1\n";
+static const char write_data2[] = "stdio_test: write fd=2\n";
+#endif
+
+#ifdef SDCC
+/* I am not yet certain why SDCC does not like the following
+ * initializer.  It involves some issues with 2- vs 3-byte
+ * pointer types.
+ */
+
+static const char *g_argv[NARGS+1];
+#else
+static const char *g_argv[NARGS+1] = { arg1, arg2, arg3, arg4, NULL };
 #endif
-static const char *g_argv[NARGS]  = { arg1, arg2, arg3, arg4 };
 
 /************************************************************
  * Private Functions
  ************************************************************/
 
+/************************************************************
+ * Name: user_main
+ ************************************************************/
+
 static int user_main(int argc, char *argv[])
 {
   int i;
@@ -90,7 +104,7 @@ static int user_main(int argc, char *argv[])
 
   for (i = 0; i <= NARGS; i++)
     {
-      printf("user_main: argv[%d]=\"%s\"\n", i, (FAR char*)argv[i]);
+      printf("user_main: argv[%d]=\"%s\"\n", i, argv[i]);
     }
 
   for (i = 1; i <= NARGS; i++)
@@ -154,6 +168,27 @@ static int user_main(int argc, char *argv[])
   return 0;
 }
 
+/************************************************************
+ * Name: stdio_test
+ ************************************************************/
+
+static void stdio_test(void)
+{
+  /* Verify that we can communicate */
+
+#if CONFIG_NFILE_DESCRIPTORS > 0
+  write(1, write_data1, sizeof(write_data1)-1);
+#endif
+  printf("stdio_test: Standard I/O Check: printf\n");
+
+#if CONFIG_NFILE_DESCRIPTORS > 1
+  write(2, write_data2, sizeof(write_data2)-1);
+#endif
+#if CONFIG_NFILE_STREAMS > 0
+  fprintf(stderr, "stdio_test: Standard I/O Check: fprintf to stderr\n");
+#endif
+}
+
 /************************************************************
  * Public Functions
  ************************************************************/
@@ -175,18 +210,20 @@ int user_start(int argc, char *argv[])
 {
   int result;
 
-  /* Verify that we can communicate */
+  /* Verify that stdio works first */
 
-#if CONFIG_NFILE_DESCRIPTORS > 0
-  write(1, write_data1, sizeof(write_data1)-1);
-#endif
-  printf("user_start: Standard I/O Check: printf\n");
+  stdio_test();
 
-#if CONFIG_NFILE_DESCRIPTORS > 1
-  write(2, write_data2, sizeof(write_data2)-1);
-#endif
-#if CONFIG_NFILE_STREAMS > 0
-  fprintf(stderr, "user_start: Standard I/O Check: fprintf to stderr\n");
+#ifdef SDCC
+  /* I am not yet certain why SDCC does not like the initilizer.
+   * It involves some issues with 2- vs 3-byte pointer types.
+   */
+
+  g_argv[0] = arg1;
+  g_argv[1] = arg2;
+  g_argv[2] = arg3;
+  g_argv[3] = arg4;
+  g_argv[4] = NULL;
 #endif
 
   /* Verify that we can spawn a new task */

sched/task_create.c

@@ -433,11 +433,13 @@ int task_create(const char *name, int priority,
 
   /* Associate file descriptors with the new task */
 
+#if CONFIG_NFILE_DESCRIPTORS > 0
   if (sched_setuptaskfiles(tcb) != OK)
     {
       sched_releasetcb(tcb);
       return ERROR;
     }
+#endif
 
   /* Allocate the stack for the TCB */