diff options
Diffstat (limited to 'tools/cpu/sh/sci.c')
| -rw-r--r-- | tools/cpu/sh/sci.c | 38 |
1 files changed, 19 insertions, 19 deletions
diff --git a/tools/cpu/sh/sci.c b/tools/cpu/sh/sci.c index 2b0cbd758f..bc7fdd83a8 100644 --- a/tools/cpu/sh/sci.c +++ b/tools/cpu/sh/sci.c @@ -12,11 +12,11 @@ /* n .. baudrate generator source 0,1,2,3 - + N .. BRR setting (0..255) - + Phi .. processor baud rate - + B .. bitrate */ @@ -51,20 +51,20 @@ static unsigned int bitrate [] = { static sci_tab_t test_array[4] ; -static void Compute( - unsigned int n, - unsigned int B, +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 = + if ( ( entry->N > 0 ) && ( entry->N < 256 ) ) + entry->err = ( ( Phi / ( (entry->N + 1) * a ) - 1.0 ) * 100.0 ); else { @@ -74,17 +74,17 @@ static void Compute( } } -static sci_tab_t *SelectN( +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 ); @@ -97,7 +97,7 @@ static sci_tab_t *SelectN( best = &test_array[i] ; } - return best ; + return best ; } int shgen_gensci( @@ -106,7 +106,7 @@ int shgen_gensci( { unsigned int i ; - fprintf( file, + fprintf( file, "/*\n * Bitrate table for the serial devices (sci) of the SH at %.3f MHz\n" " */\n\n", Phi / 1000000.0 ); fprintf( file, @@ -118,13 +118,13 @@ int shgen_gensci( " * We experienced values less than 2%% to be stable\n" " */\n\n" ); fprintf( file, "#include <termios.h>\n\n" ); - fprintf( file, + fprintf( file, "static struct sci_bitrate_t {\n" " unsigned char n ;\n" " unsigned char N ;\n" "} _sci_bitrates[] = {\n" "/* n N error */\n" ); - + for ( i = 0 ; i < sizeof(bitrate)/sizeof(int) ; i++ ) { struct sci_tab* best = SelectN( bitrate[i], Phi ); @@ -143,7 +143,7 @@ int shgen_gensci( fprintf( file, "\n};\n\n" ); - fprintf( file, + fprintf( file, "int _sci_get_brparms( \n" " tcflag_t cflag,\n" " unsigned char *smr,\n" @@ -160,6 +160,6 @@ int shgen_gensci( " *brr = _sci_bitrates[offset].N;\n\n" " return 0;\n" "}\n" ); - + return 0 ; } |