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upd7759: Fixes to switching between slave and stand alone mode. (nw) (#9772)

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wilbertpol 2022-05-17 03:31:53 +01:00 committed by GitHub
parent c504690af5
commit 9a33d69261
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1 changed files with 12 additions and 7 deletions
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19
src/devices/sound/upd7759.cpp
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@ -390,8 +390,6 @@ void upd775x_device::advance_state()
{
// Idle state: we stick around here while there's nothing to do
case STATE_IDLE:
// If we have dropped back to idle state we always switch back to stand alone mode
m_mode = MODE_STAND_ALONE;
m_clocks_left = 4;
break;
@ -678,7 +676,7 @@ void upd7759_device::internal_start_w(int state)
m_channel->update();
if (m_state == STATE_IDLE && oldstart && !m_start && m_reset)
if (m_state == STATE_IDLE && m_mode == MODE_STAND_ALONE && oldstart && !m_start && m_reset)
{
m_state = STATE_START;
@ -725,11 +723,18 @@ void upd7759_device::internal_md_w(int state)
m_channel->update();
if (m_state == STATE_IDLE && old_md && !m_md && m_reset)
if (m_state == STATE_IDLE && m_reset)
{
m_mode = MODE_SLAVE;
m_state = STATE_START;
m_timer->adjust(attotime::zero);
if (old_md && !m_md)
{
m_mode = MODE_SLAVE;
m_state = STATE_START;
m_timer->adjust(attotime::zero);
}
else if (!old_md && m_md)
{
m_mode = MODE_STAND_ALONE;
}
}
}