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don't transmit anything when driven by an external clock and nothing has been queued. [smf]

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smf- 2013-12-27 23:26:53 +00:00
parent 0f05353374
commit dbcd354ab3
1 changed files with 9 additions and 4 deletions
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13
src/emu/diserial.c
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@ -44,7 +44,7 @@ device_serial_interface::device_serial_interface(const machine_config &mconfig,
m_tra_clock_state = false;
m_tra_rate = attotime::never;
m_rcv_rate = attotime::never;
m_tra_flags = 0;
m_tra_flags = TRANSMIT_REGISTER_EMPTY;
m_rcv_register_data = 0x8000;
m_rcv_bit_count = 0;
m_connection_state = 0;
@ -80,11 +80,16 @@ void device_serial_interface::set_tra_rate(attotime rate)
void device_serial_interface::tra_edge()
{
tra_callback();
if(is_transmit_register_empty())
if (!is_transmit_register_empty())
{
tra_callback();
if (is_transmit_register_empty())
tra_complete();
}
if (is_transmit_register_empty() && !m_tra_rate.is_never())
{
m_tra_clock->adjust(attotime::never);
tra_complete();
}
}