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Merge pull request #1096 from shattered/_1465f6a

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null_modem: rtscts flow control + relevant fix to i8251
This commit is contained in:
Vas Crabb 2016-07-14 09:10:44 +10:00 committed by GitHub
commit 28a552352b
3 changed files with 9 additions and 4 deletions
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7
src/devices/bus/rs232/null_modem.cpp
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@ -15,7 +15,8 @@ null_modem_device::null_modem_device(const machine_config &mconfig, const char *
m_rs232_stopbits(*this, "RS232_STOPBITS"), m_rs232_stopbits(*this, "RS232_STOPBITS"),
m_input_count(0), m_input_count(0),
m_input_index(0), m_input_index(0),
m_timer_poll(nullptr) m_timer_poll(nullptr),
m_rts(ASSERT_LINE)
{ {
} }
@ -68,6 +69,8 @@ WRITE_LINE_MEMBER(null_modem_device::update_serial)
output_dcd(0); output_dcd(0);
output_dsr(0); output_dsr(0);
output_cts(0); output_cts(0);
m_rts = ASSERT_LINE;
} }
void null_modem_device::device_reset() void null_modem_device::device_reset()
@ -99,7 +102,7 @@ void null_modem_device::queue()
m_input_count = m_stream->input(m_input_buffer, sizeof(m_input_buffer)); m_input_count = m_stream->input(m_input_buffer, sizeof(m_input_buffer));
} }
if (m_input_count != 0) if (m_input_count != 0 && m_rts == ASSERT_LINE)
{ {
transmit_register_setup(m_input_buffer[m_input_index++]); transmit_register_setup(m_input_buffer[m_input_index++]);

2
src/devices/bus/rs232/null_modem.h
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@ -15,6 +15,7 @@ public:
virtual machine_config_constructor device_mconfig_additions() const override; virtual machine_config_constructor device_mconfig_additions() const override;
virtual WRITE_LINE_MEMBER( input_txd ) override { device_serial_interface::rx_w(state); } virtual WRITE_LINE_MEMBER( input_txd ) override { device_serial_interface::rx_w(state); }
virtual WRITE_LINE_MEMBER( input_rts ) override { m_rts = (line_state) state; }
DECLARE_WRITE_LINE_MEMBER(update_serial); DECLARE_WRITE_LINE_MEMBER(update_serial);
@ -46,6 +47,7 @@ private:
UINT32 m_input_count; UINT32 m_input_count;
UINT32 m_input_index; UINT32 m_input_index;
emu_timer *m_timer_poll; emu_timer *m_timer_poll;
line_state m_rts;
}; };
extern const device_type NULL_MODEM; extern const device_type NULL_MODEM;

4
src/devices/machine/i8251.cpp
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@ -416,8 +416,8 @@ WRITE8_MEMBER(i8251_device::command_w)
1 = transmit enable 1 = transmit enable
*/ */
m_rts_handler(!BIT(data, 5)); m_rts_handler(BIT(data, 5));
m_dtr_handler(!BIT(data, 1)); m_dtr_handler(BIT(data, 1));
if (data & (1<<4)) if (data & (1<<4))
{ {