UINT16 psxrcnt_device::root_current( int n_counter )
{
psx_root *root = &root_counter[ n_counter ];
if( ( root->n_mode & PSX_RC_STOP ) != 0 )
{
return root->n_count;
}
else
{
UINT64 n_current;
n_current = gettotalcycles() - root->n_start;
n_current /= root_divider( n_counter );
n_current += root->n_count;
if( n_current > 0xffff )
{
/* TODO: use timer for wrap on 0x10000. */
root->n_count = n_current;
root->n_start = gettotalcycles();
}
return n_current;
}
}
void psxrcnt_device::root_timer_adjust( int n_counter )
{
psx_root *root = &root_counter[ n_counter ];
if( ( root->n_mode & PSX_RC_STOP ) != 0 )
{
root->timer->adjust( attotime::never, n_counter);
}
else
{
int n_duration;
n_duration = root_target( n_counter ) - root_current( n_counter );
if( n_duration < 1 )
{
n_duration += 0x10000;
}
n_duration *= root_divider( n_counter );
root->timer->adjust( attotime::from_hz(33868800) * n_duration, n_counter);
}
}
void psxrcnt_device::root_timer_adjust( int n_counter )
{
psx_root *root = &root_counter[ n_counter ];
if( ( root->n_mode & PSX_RC_STOP ) != 0 )
{
root->timer->adjust( attotime::never, n_counter);
}
else
{
int n_duration;
n_duration = root_target( n_counter ) - root_current( n_counter );
if( n_duration < 1 )
{
n_duration += 0x10000;
}
n_duration *= root_divider( n_counter );
// TODO: figure out if this should be calculated from the cpu clock for 50mhz boards?
root->timer->adjust( attotime::from_hz(33868800) * n_duration, n_counter);
}
}
