summaryrefslogtreecommitdiffstatshomepage
path: root/src/devices/bus/rs232/terminal.cpp
blob: 5db97affccbbf9080f5a344ed2797e147b016610 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
// license:BSD-3-Clause
// copyright-holders:smf
#include "emu.h"
#include "terminal.h"

#include "machine/terminal.h"


namespace {

class serial_terminal_device : public generic_terminal_device,
	public device_buffered_serial_interface<16U>,
	public device_rs232_port_interface
{
public:
	serial_terminal_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock);

	virtual DECLARE_WRITE_LINE_MEMBER( input_txd ) override { device_buffered_serial_interface::rx_w(state); }

	DECLARE_WRITE_LINE_MEMBER(update_serial);

protected:
	virtual ioport_constructor device_input_ports() const override;
	virtual void device_reset() override;

	virtual void tra_callback() override;
	virtual void send_key(uint8_t code) override;

private:
	virtual void received_byte(uint8_t byte) override;

	required_ioport m_rs232_txbaud;
	required_ioport m_rs232_rxbaud;
	required_ioport m_rs232_databits;
	required_ioport m_rs232_parity;
	required_ioport m_rs232_stopbits;
};

serial_terminal_device::serial_terminal_device(const machine_config &mconfig, const char *tag, device_t *owner, const XTAL &clock)
	: generic_terminal_device(mconfig, SERIAL_TERMINAL, tag, owner, clock, TERMINAL_WIDTH, TERMINAL_HEIGHT)
	, device_buffered_serial_interface(mconfig, *this)
	, device_rs232_port_interface(mconfig, *this)
	, m_rs232_txbaud(*this, "RS232_TXBAUD")
	, m_rs232_rxbaud(*this, "RS232_RXBAUD")
	, m_rs232_databits(*this, "RS232_DATABITS")
	, m_rs232_parity(*this, "RS232_PARITY")
	, m_rs232_stopbits(*this, "RS232_STOPBITS")
{
}

static INPUT_PORTS_START(serial_terminal)
	PORT_INCLUDE(generic_terminal)

	PORT_RS232_BAUD("RS232_TXBAUD", RS232_BAUD_9600, "TX Baud", serial_terminal_device, update_serial)
	PORT_RS232_BAUD("RS232_RXBAUD", RS232_BAUD_9600, "RX Baud", serial_terminal_device, update_serial)
	PORT_RS232_DATABITS("RS232_DATABITS", RS232_DATABITS_8, "Data Bits", serial_terminal_device, update_serial)
	PORT_RS232_PARITY("RS232_PARITY", RS232_PARITY_NONE, "Parity", serial_terminal_device, update_serial)
	PORT_RS232_STOPBITS("RS232_STOPBITS", RS232_STOPBITS_1, "Stop Bits", serial_terminal_device, update_serial)
INPUT_PORTS_END

ioport_constructor serial_terminal_device::device_input_ports() const
{
	return INPUT_PORTS_NAME(serial_terminal);
}

WRITE_LINE_MEMBER(serial_terminal_device::update_serial)
{
	clear_fifo();

	int const startbits = 1;
	int const databits = convert_databits(m_rs232_databits->read());
	parity_t const parity = convert_parity(m_rs232_parity->read());
	stop_bits_t const stopbits = convert_stopbits(m_rs232_stopbits->read());

	set_data_frame(startbits, databits, parity, stopbits);

	int const txbaud = convert_baud(m_rs232_txbaud->read());
	set_tra_rate(txbaud);

	int const rxbaud = convert_baud(m_rs232_rxbaud->read());
	set_rcv_rate(rxbaud);

	output_rxd(1);

	// TODO: make this configurable
	output_dcd(0);
	output_dsr(0);
	output_cts(0);
	receive_register_reset();
	transmit_register_reset();
}

void serial_terminal_device::device_reset()
{
	generic_terminal_device::device_reset();

	update_serial(0);
}

void serial_terminal_device::send_key(uint8_t code)
{
	transmit_byte(code);
}

void serial_terminal_device::tra_callback()
{
	output_rxd(transmit_register_get_data_bit());
}

void serial_terminal_device::received_byte(uint8_t byte)
{
	term_write(byte);
}

} // anonymous namespace


DEFINE_DEVICE_TYPE_PRIVATE(SERIAL_TERMINAL, device_rs232_port_interface, serial_terminal_device, "serial_terminal", "Serial Terminal")