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Merge pull request #6738 from shattered/_074282f0be1

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rs232 null_modem: XON/XOFF flow control (nw)
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ajrhacker 2020-05-24 11:33:16 -04:00 committed by GitHub
commit a3ca22a41b
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2 changed files with 32 additions and 4 deletions
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35
src/devices/bus/rs232/null_modem.cpp
View File

@ -19,7 +19,8 @@ null_modem_device::null_modem_device(const machine_config &mconfig, const char *
m_input_index(0),
m_timer_poll(nullptr),
m_rts(0),
m_dtr(0)
m_dtr(0),
m_xoff(0)
{
}
@ -37,10 +38,11 @@ static INPUT_PORTS_START(null_modem)
PORT_RS232_STOPBITS("RS232_STOPBITS", RS232_STOPBITS_1, "Stop Bits", null_modem_device, update_serial)
PORT_START("FLOW_CONTROL")
PORT_CONFNAME(0x03, 0x00, "Flow Control")
PORT_CONFNAME(0x07, 0x00, "Flow Control")
PORT_CONFSETTING(0x00, "Off")
PORT_CONFSETTING(0x01, "RTS")
PORT_CONFSETTING(0x02, "DTR")
PORT_CONFSETTING(0x04, "XON/XOFF")
INPUT_PORTS_END
ioport_constructor null_modem_device::device_input_ports() const
@ -77,6 +79,7 @@ WRITE_LINE_MEMBER(null_modem_device::update_serial)
m_rts = 0;
m_dtr = 0;
m_xoff = 0;
}
void null_modem_device::device_reset()
@ -112,7 +115,7 @@ void null_modem_device::queue()
{
uint8_t fc = m_flow->read();
if (fc == 0 || (fc == 1 && m_rts == 0) || (fc == 2 && m_dtr == 0))
if (fc == 0 || (fc == 1 && m_rts == 0) || (fc == 2 && m_dtr == 0) || (fc == 4 && m_xoff == 0))
{
transmit_register_setup(m_input_buffer[m_input_index++]);
m_timer_poll->adjust(attotime::never);
@ -137,8 +140,32 @@ void null_modem_device::tra_complete()
void null_modem_device::rcv_complete()
{
u8 data;
receive_register_extract();
m_stream->output(get_received_char());
data = get_received_char();
if (m_flow->read() != 4)
{
m_stream->output(data);
}
else
{
switch (data)
{
case 0x13: // XOFF
m_xoff = 1;
return;
case 0x11: // XON
m_xoff = 0;
return;
default:
break;
}
m_stream->output(data);
}
}
DEFINE_DEVICE_TYPE(NULL_MODEM, null_modem_device, "null_modem", "RS232 Null Modem")

1
src/devices/bus/rs232/null_modem.h
View File

@ -52,6 +52,7 @@ private:
emu_timer *m_timer_poll;
int m_rts;
int m_dtr;
int m_xoff;
};
DECLARE_DEVICE_TYPE(NULL_MODEM, null_modem_device)