void pr8210_state::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)
{
switch (id)
{
case TIMER_ID_BIT:
{
attotime duration = attotime::from_msec(30);
uint8_t bitsleft = param >> 16;
uint8_t data = param;
// if we have bits, process
if (bitsleft != 0)
{
// assert the line and set a timer for deassertion
m_laserdisc->control_w(ASSERT_LINE);
timer_set(attotime::from_usec(250), TIMER_ID_BIT_OFF);
// space 0 bits apart by 1msec, and 1 bits by 2msec
duration = attotime::from_msec((data & 0x80) ? 2 : 1);
data <<= 1;
bitsleft--;
}
// if we're out of bits, queue up the next command
else if (bitsleft == 0 && m_command_buffer_in != m_command_buffer_out)
{
data = m_command_buffer[m_command_buffer_out++ % ARRAY_LENGTH(m_command_buffer)];
bitsleft = 12;
}
m_bit_timer->adjust(duration, (bitsleft << 16) | data);
break;
}
// deassert the control line
case TIMER_ID_BIT_OFF:
m_laserdisc->control_w(CLEAR_LINE);
break;
// others to the parent class
default:
ldplayer_state::device_timer(timer, id, param, ptr);
break;
}
}
