void gaelco_serial_device::device_stop()
{
shmem_lock(m_shmem);
buf_reset(m_out_ptr);
buf_reset(m_in_ptr);
shmem_unlock(m_shmem);
osd_sharedmem_free(m_os_shmem);
}
static TIMER_CALLBACK( link_cb )
{
gaelco_serial_state *state = (gaelco_serial_state *) ptr;
shmem_lock(state->m_shmem);
state->m_out_ptr->cnt++;
sync_link(state);
shmem_unlock(state->m_shmem);
}
static DEVICE_STOP( gaelco_serial )
{
gaelco_serial_state *state = get_token(device);
shmem_lock(state->m_shmem);
buf_reset(state->m_out_ptr);
buf_reset(state->m_in_ptr);
shmem_unlock(state->m_shmem);
osd_sharedmem_free(state->m_os_shmem);
}
void gaelco_serial_device::device_reset()
{
m_status = GAELCOSER_STATUS_READY |GAELCOSER_STATUS_IRQ_ENABLE ;
m_last_in_msg_cnt = -1;
m_slack_cnt = LINK_SLACK_B;
shmem_lock(m_shmem);
buf_reset(m_out_ptr);
buf_reset(m_in_ptr);
shmem_unlock(m_shmem);
}
static DEVICE_RESET( gaelco_serial )
{
gaelco_serial_state *state = get_token(device);
state->m_status = GAELCOSER_STATUS_READY |GAELCOSER_STATUS_IRQ_ENABLE ;
state->m_last_in_msg_cnt = -1;
state->m_slack_cnt = LINK_SLACK_B;
shmem_lock(state->m_shmem);
buf_reset(state->m_out_ptr);
buf_reset(state->m_in_ptr);
shmem_unlock(state->m_shmem);
}
static void sync_link(gaelco_serial_state *state)
{
volatile buf_t *buf = state->m_in_ptr;
int breakme = 1;
do
{
shmem_lock(state->m_shmem);
process_in(state);
/* HACK: put some timing noise on the line */
if (buf->cnt + state->m_slack_cnt > state->m_out_ptr->cnt)
breakme = 0;
/* stop if not connected .. */
if ((state->m_out_ptr->stat & GAELCOSER_STATUS_RESET) != 0)
breakme = 0;
shmem_unlock(state->m_shmem);
} while (breakme);
state->m_slack_cnt++;
state->m_slack_cnt = (state->m_slack_cnt % LINK_SLACK) + LINK_SLACK_B;
shmem_lock(state->m_shmem);
state->m_out_ptr->stat &= ~GAELCOSER_STATUS_RESET;
shmem_unlock(state->m_shmem);
}
