[PATCH 3/6] shgen: Import from RTEMS

Sebastian Huber sebastian.huber at embedded-brains.de
Thu Jun 7 05:39:04 UTC 2018


Corresponding RTEMS commit is 75933d5d25cd50f80162b7a0d2f66a5534e1763f.

Update #3443.
---
 misc/shgen/AUTHORS |   3 +
 misc/shgen/COPYING | 340 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 misc/shgen/TODO    |  13 ++
 misc/shgen/sci.c   | 177 ++++++++++++++++++++++++++++
 misc/shgen/sci.h   |  11 ++
 misc/shgen/shgen.c | 114 ++++++++++++++++++
 misc/wscript       |   9 ++
 7 files changed, 667 insertions(+)
 create mode 100644 misc/shgen/AUTHORS
 create mode 100644 misc/shgen/COPYING
 create mode 100644 misc/shgen/TODO
 create mode 100644 misc/shgen/sci.c
 create mode 100644 misc/shgen/sci.h
 create mode 100644 misc/shgen/shgen.c

diff --git a/misc/shgen/AUTHORS b/misc/shgen/AUTHORS
new file mode 100644
index 0000000..225c2fa
--- /dev/null
+++ b/misc/shgen/AUTHORS
@@ -0,0 +1,3 @@
+Ralf Corsepius (corsepiu at faw.uni-ulm.de)
+	* Initial implementation
+	* generator for sci bitrate table
diff --git a/misc/shgen/COPYING b/misc/shgen/COPYING
new file mode 100644
index 0000000..8cc2ef7
--- /dev/null
+++ b/misc/shgen/COPYING
@@ -0,0 +1,340 @@
+
+		    GNU GENERAL PUBLIC LICENSE
+		       Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.
+ 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ Everyone is permitted to copy and distribute verbatim copies
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diff --git a/misc/shgen/TODO b/misc/shgen/TODO
new file mode 100644
index 0000000..bcdd1bf
--- /dev/null
+++ b/misc/shgen/TODO
@@ -0,0 +1,13 @@
+* Add support for more drivers to shgen !!!!
+
+* shgen relies on having a gnu-compatible getopt, which should be
+  available on all hosts using gcc/egcs/binutils. 
+  Using other getopt-variants may produce faulty results or shgen may also
+  refuse to compile. Probably the easiest solution to this problem would be 
+  to integrate libiberty into rtems.
+
+* shgen uses floating point mathematics. Therefore Makefile.in contains a 
+  reference to libm. In case the host doesn't have its floating point
+  support in libm, shgen will fail to compile. If we should ever meet such 
+  a host, checks for floating point libraries have to be added to rtems'
+  autoconf support.
diff --git a/misc/shgen/sci.c b/misc/shgen/sci.c
new file mode 100644
index 0000000..2b68612
--- /dev/null
+++ b/misc/shgen/sci.c
@@ -0,0 +1,177 @@
+/*
+ * Copyright (c) 1998 Ralf Corsepius (corsepiu at faw.uni-ulm.de)
+ *
+ * See the file COPYING for copyright notice.
+ */
+
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "sci.h"
+
+/*
+   n .. baudrate generator source 0,1,2,3
+
+   N .. BRR setting (0..255)
+
+   Phi .. processor baud rate
+
+   B .. bitrate
+ */
+
+typedef struct sci_tab {
+  unsigned int  B ;
+  unsigned int  n ;
+  int 		N ;
+  double        err ;
+  } sci_tab_t ;
+
+static unsigned int bitrate [] = {
+  50,
+  75,
+  110,
+  134,
+  150,
+  200,
+  300,
+  600,
+  1200,
+  1800,
+  2400,
+  4800,
+  9600,
+  19200,
+  38400,
+  7200,
+  14400,
+  28800,
+  57600,
+  76800,
+  115200,
+  230400,
+  460800,
+  921600
+};
+
+static sci_tab_t test_array[4] ;
+
+static void Compute(
+  unsigned int n,
+  unsigned int B,
+  double   Phi,
+  struct sci_tab *entry )
+{
+  int    a = ( 32 << ( 2 * n ) ) * B ;
+
+  entry->n = n ;
+  entry->B = B ;
+  entry->N = rint( ( Phi / a ) - 1.0 ) ;
+
+  if ( ( entry->N > 0 ) && ( entry->N < 256 ) )
+    entry->err =
+      ( ( Phi / ( (entry->N + 1) * a ) - 1.0 ) * 100.0 );
+  else
+  {
+    entry->err = 100.0 ;
+    entry->n = 255 ;
+    entry->N = 0 ;
+  }
+}
+
+static sci_tab_t *SelectN(
+  unsigned int 	B,
+  double 	Phi )
+{
+  unsigned int i ;
+  struct sci_tab* best = NULL ;
+
+  for ( i = 0 ; i < 4 ; i++ )
+  {
+    double err ;
+
+    Compute( i, B, Phi, &test_array[i] );
+    err = fabs( test_array[i].err );
+
+    if ( best )
+    {
+      if ( err < fabs( best->err ) )
+        best = &test_array[i] ;
+    }
+    else
+      best = &test_array[i] ;
+  }
+
+  return best ;
+}
+
+int shgen_gensci(
+  FILE		*file,
+  double	Phi ) /* Processor frequency [Hz] */
+{
+  unsigned int i ;
+
+  fprintf( file,
+    "/*\n * Bitrate table for the serial devices (sci) of the SH at %.3f MHz\n"
+    " */\n\n", Phi / 1000000.0 );
+  fprintf( file,
+    "/*\n"
+    " * n     .. SMR bits 0,1 : baud rate generator clock source\n"
+    " * N     .. BRR bits 0..7: setting for baud rate generator\n"
+    " * error .. percentual error to nominal bitrate\n"
+    " *   Hitachi's HW manual recommends bitrates with an error less than 1%%\n"
+    " *   We experienced values less than 2%% to be stable\n"
+    " */\n\n" );
+  fprintf( file, "#include <bsp.h>\n" );
+  fprintf( file, "#include <termios.h>\n\n" );
+  fprintf( file,
+    "static struct sci_bitrate_t {\n"
+    "  unsigned char n ;\n"
+    "  unsigned char N ;\n"
+    "  speed_t       B ;\n"
+    "} _sci_bitrates[] = {\n"
+    "/*  n    N      B      error */\n" );
+
+  for ( i = 0 ; i < sizeof(bitrate)/sizeof(int) ; i++ )
+  {
+    struct sci_tab* best = SelectN( bitrate[i], Phi );
+
+    if ( i > 0 )
+      fprintf( file, ",\n" );
+      fprintf( file, "  { %1d, %3d, %d } /* %+7.2f%% ; B%d ",
+      best->n,
+      best->N,
+      best->B,
+      best->err,
+      best->B );
+    if ( best->n > 3 )
+      fprintf( file, "(unusable) " );
+    fprintf( file, "*/" );
+  }
+
+  fprintf( file, "\n};\n\n" );
+
+  fprintf( file,
+    "int _sci_get_brparms( \n"
+    "  speed_t        spd,\n"
+    "  unsigned char *smr,\n"
+    "  unsigned char *brr )\n"
+    "{\n"
+    "  int offset = -1;\n"
+    "  int i;\n\n"
+    "  for(i = 0; i < sizeof(_sci_bitrates)/sizeof(_sci_bitrates[0]); i++) {\n"
+    "    if( _sci_bitrates[i].B == spd ) {\n"
+    "      offset = i;\n"
+    "      break;\n"
+    "    }\n"
+    "  }\n"
+    "  if ( offset == -1 ) return -1 ;\n"
+    "  if ( _sci_bitrates[offset].n > 3 )  return -1;\n\n"
+    "  *smr &= ~0x03;\n"
+    "  *smr |= _sci_bitrates[offset].n;\n"
+    "  *brr =  _sci_bitrates[offset].N;\n\n"
+    "  return 0;\n"
+    "}\n" );
+
+  return 0 ;
+}
diff --git a/misc/shgen/sci.h b/misc/shgen/sci.h
new file mode 100644
index 0000000..b55bbfb
--- /dev/null
+++ b/misc/shgen/sci.h
@@ -0,0 +1,11 @@
+#ifndef _shgen_sci_h
+#define _shgen_sci_h
+
+#include <stdio.h>
+
+extern int shgen_gensci(
+  FILE		*file,
+  double	Phi /* Processor frequency [Hz] */
+  );
+
+#endif
diff --git a/misc/shgen/shgen.c b/misc/shgen/shgen.c
new file mode 100644
index 0000000..19e512b
--- /dev/null
+++ b/misc/shgen/shgen.c
@@ -0,0 +1,114 @@
+/*
+ * Copyright (c) 1998,1999,2000, 2006 Ralf Corsepius, Ulm Germany.
+ *
+ * See the file COPYING for copyright notice.
+ */
+
+#include <stdio.h>
+#include <string.h>	/* strcmp, strerror */
+#include <stdlib.h>	/* exit */
+#include <errno.h>
+#include <getopt.h>
+
+#include "sci.h"
+
+static void usage( FILE* ofile, char *prog )
+{
+  fprintf( ofile, "Usage: %s [options] driver\n", prog );
+  fprintf( ofile, "\nOptions:\n" );
+  fprintf( ofile, "Processor frequency (default 20MHz):\n") ;
+  fprintf( ofile, "\t-M Phi      .. processor frequency [MHz]\n" );
+  fprintf( ofile, "\t-K Phi      .. processor frequency [KHz]\n" );
+  fprintf( ofile, "\t-H Phi      .. processor frequency [Hz]\n" );
+  fprintf( ofile, "Driver:\n" );
+  fprintf( ofile, "\tsci         .. bitrate table for sci\n" );
+
+  fprintf( ofile, "\nWritten by Ralf Corsepius <corsepiu at faw.uni-ulm.de>\n" );
+  fprintf( ofile, "\nCopyright (c) 1998,1999,2000\tRalf Corsepius\n" );
+}
+
+#if HAVE_GETOPT_LONG
+#define NOARG   0
+#define HASARG  1
+#define OPTARG  2
+
+static struct option long_options[] =
+{
+  { "version",  	NOARG,  NULL, 'v' },
+  { "help",     	NOARG,  NULL, 'h' },
+  { "mega-hertz",       HASARG, NULL, 'M' },
+  { "kilo-hertz",       HASARG, NULL, 'K' },
+  { "hertz",  		HASARG, NULL, 'H' },
+  { 0, 0, 0, 0 }
+};
+#endif
+
+static void shgen_header( FILE *file )
+{
+  fprintf( file,
+    "/*\n * DO NOT EDIT - this file is automatically generated by shgen %s\n",
+    RTEMS_RELEASE );
+  fprintf( file,
+    " * Copyright (c) 1998,1999,2000 Ralf Corsepius (corsepiu at faw.uni-ulm.de)\n */\n" );
+  fprintf( file,
+    "\n/* This file is not copyrighted */\n\n" );
+}
+
+int main( int argc, char *argv[] )
+{
+  double 	Phi = 20000000.0 ;
+
+#if HAVE_GETOPT_LONG
+  int option_index = 0 ;
+  while( ( optopt = getopt_long( argc, argv, "M:K:H:hv",
+      long_options, &option_index ) ) > 0 )
+#else
+  while ( ( optopt = getopt( argc, argv, "M:K:H:hv" ) ) > 0 )
+#endif
+  {
+    switch ( optopt )
+    {
+    case 'M' :
+      sscanf( optarg, "%lf", &Phi );
+      Phi = Phi * 1000000.0;
+      break ;
+    case 'K' :
+      sscanf( optarg, "%lf", &Phi );
+      Phi = Phi * 1000.0;
+      break ;
+    case 'H' :
+      sscanf( optarg, "%lf", &Phi );
+      break ;
+    case 'h' :
+      usage( stdout, argv[0] );
+      exit(0);
+    case 'v' :
+      fprintf( stdout, "%s version %s\n", argv[0], RTEMS_RELEASE );
+      exit(0);
+    default  :
+      usage( stderr, argv[0] );
+      exit(1);
+      break ;
+    }
+  }
+
+  if ( argc - optind != 1 )
+  {
+    fprintf( stderr, "%s: Missing argument: driver\n", argv[0] );
+    exit(1);
+  }
+
+  shgen_header( stdout );
+
+  if ( strcmp( argv[optind], "sci" ) == 0 )
+  {
+    shgen_gensci( stdout, Phi );
+  }
+  else
+  {
+    fprintf( stderr, "%s: Invalid argument: driver\n", argv[0] );
+    exit(1);
+  }
+
+  return 0 ;
+}
diff --git a/misc/wscript b/misc/wscript
index 2b1332e..5db9107 100644
--- a/misc/wscript
+++ b/misc/wscript
@@ -66,5 +66,14 @@ def build(bld):
                 cflags = conf['cflags'] + conf['warningflags'],
                 linkflags = conf['linkflags'])
 
+    #
+    # Build the shgen.
+    #
+    bld.program(target = 'rtems-shgen',
+                source = [ 'shgen/sci.c', 'shgen/shgen.c' ],
+                defines = defines,
+                cflags = conf['cflags'] + conf['warningflags'],
+                linkflags = conf['linkflags'])
+
 def tags(ctx):
     ctx.exec_command('etags $(find . -name \*.[sSch])', shell = True)
-- 
2.13.7




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