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// license:BSD-3-Clause
// copyright-holders:Curt Coder
/**********************************************************************
Motorola MC6852 Synchronous Serial Data Adapter emulation
**********************************************************************
_____ _____
Vss 1 |* \_/ | 24 _CTS
Rx DATA 2 | | 23 _DCD
Rx CLK 3 | | 22 D0
Tx CLK 4 | | 21 D1
SM/_DTR 5 | | 20 D2
Tx DATA 6 | MC6852 | 19 D3
_IRQ 7 | | 18 D4
TUF 8 | | 17 D5
_RESET 9 | | 16 D6
_CS 9 | | 15 D7
RS 9 | | 14 E
Vcc 10 |_____________| 13 R/_W
**********************************************************************/
#ifndef MAME_MACHINE_MC6852_H
#define MAME_MACHINE_MC6852_H
#pragma once
#include "diserial.h"
#include <queue>
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> mc6852_device
class mc6852_device : public device_t,
public device_serial_interface
{
public:
// construction/destruction
mc6852_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
void set_rx_clock(int clock) { m_rx_clock = clock; }
void set_tx_clock(int clock) { m_tx_clock = clock; }
auto tx_data_callback() { return m_write_tx_data.bind(); }
auto irq_callback() { return m_write_irq.bind(); }
auto sm_dtr_callback() { return m_write_sm_dtr.bind(); }
auto tuf_callback() { return m_write_tuf.bind(); }
uint8_t read(offs_t offset);
void write(offs_t offset, uint8_t data);
DECLARE_WRITE_LINE_MEMBER( rx_data_w ) { device_serial_interface::rx_w(state); }
DECLARE_WRITE_LINE_MEMBER( rx_clk_w ) { rx_clock_w(state); }
DECLARE_WRITE_LINE_MEMBER( tx_clk_w ) { tx_clock_w(state); }
DECLARE_WRITE_LINE_MEMBER( cts_w ) { m_cts = state; }
DECLARE_WRITE_LINE_MEMBER( dcd_w ) { m_dcd = state; }
DECLARE_READ_LINE_MEMBER( sm_dtr_r ) { return m_sm_dtr; }
DECLARE_READ_LINE_MEMBER( tuf_r ) { return m_tuf; }
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// device_serial_interface overrides
virtual void tra_callback() override;
virtual void tra_complete() override;
virtual void rcv_complete() override;
private:
enum
{
S_IRQ = 0x80,
S_PE = 0x40,
S_RX_OVRN = 0x20,
S_TUF = 0x10,
S_CTS = 0x08,
S_DCD = 0x04,
S_TDRA = 0x02,
S_RDA = 0x01
};
enum
{
C1_AC_MASK = 0xc0,
C1_AC_C2 = 0x00,
C1_AC_C3 = 0x40,
C1_AC_SYNC = 0x80,
C1_AC_TX_FIFO = 0xc0,
C1_AC2 = 0x80,
C1_AC1 = 0x40,
C1_RIE = 0x20,
C1_TIE = 0x10,
C1_CLEAR_SYNC = 0x08,
C1_STRIP_SYNC = 0x04,
C1_TX_RS = 0x02,
C1_RX_RS = 0x01
};
enum
{
C2_EIE = 0x80,
C2_TX_SYNC = 0x40,
C2_WS_MASK = 0x38,
C2_WS3 = 0x20,
C2_WS2 = 0x10,
C2_WS1 = 0x08,
C2_1_2_BYTE = 0x04,
C2_PC_MASK = 0x03,
C2_PC2 = 0x02,
C2_PC1 = 0x01
};
enum
{
C3_CTUF = 0x08,
C3_CTS = 0x04,
C3_1_2_SYNC = 0x02,
C3_E_I_SYNC = 0x01
};
devcb_write_line m_write_tx_data;
devcb_write_line m_write_irq;
devcb_write_line m_write_sm_dtr;
devcb_write_line m_write_tuf;
uint8_t m_status; // status register
uint8_t m_cr[3]; // control registers
uint8_t m_scr; // sync code register
uint8_t m_tdr; // transmit data register
uint8_t m_tsr; // transmit shift register
uint8_t m_rdr; // receive data register
uint8_t m_rsr; // receive shift register
std::queue<uint8_t> m_rx_fifo;
std::queue<uint8_t> m_tx_fifo;
int m_rx_clock;
int m_tx_clock;
int m_cts; // clear to send
int m_dcd; // data carrier detect
int m_sm_dtr; // sync match/data terminal ready
int m_tuf; // transmitter underflow
};
// device type definition
DECLARE_DEVICE_TYPE(MC6852, mc6852_device)
#endif // MAME_MACHINE_MC6852_H
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