[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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