utilities.c

/* utilities.c: miscellaneous utility routines
   Copyright (c) 2011 Philip Kendall

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License along
   with this program; if not, write to the Free Software Foundation, Inc.,
   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

   Author contact information:

   E-mail: Philip Kendall <philip-fuse@shadowmagic.org.uk>

*/

#include <config.h>

#include "internals.h"

#define TZX_HZ 3500000


static const libspectrum_dword tstates_per_ms = TZX_HZ / 1000;


libspectrum_dword libspectrum_ms_to_tstates(libspectrum_dword ms)
{
    return ms * tstates_per_ms;
}


libspectrum_dword libspectrum_tstates_to_ms(libspectrum_dword tstates)
{
    return tstates / tstates_per_ms;
}


void libspectrum_set_pause_ms(libspectrum_tape_block *block, libspectrum_dword pause_ms)
{
    libspectrum_tape_block_set_pause(block, pause_ms);
    libspectrum_tape_block_set_pause_tstates(block, libspectrum_ms_to_tstates(pause_ms));
}


void libspectrum_set_pause_tstates(libspectrum_tape_block *block, libspectrum_dword pause_tstates)
{
    libspectrum_tape_block_set_pause_tstates(block, pause_tstates);
    libspectrum_tape_block_set_pause(block, libspectrum_tstates_to_ms(pause_tstates));
}


size_t libspectrum_bits_to_bytes(size_t bits)
{
    return (bits + LIBSPECTRUM_BITS_IN_BYTE - 1) / LIBSPECTRUM_BITS_IN_BYTE;
}