// 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
**********************************************************************/
#pragma once
#ifndef __MC6852__
#define __MC6852__
#include "emu.h"
#include <queue>
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_MC6852_RX_CLOCK(_clock) \
mc6852_device::set_rx_clock(*device, _clock);
#define MCFG_MC6852_TX_CLOCK(_clock) \
mc6852_device::set_tx_clock(*device, _clock);
#define MCFG_MC6852_TX_DATA_CALLBACK(_write) \
devcb = &mc6852_device::set_tx_data_wr_callback(*device, DEVCB_##_write);
#define MCFG_MC6852_IRQ_CALLBACK(_write) \
devcb = &mc6852_device::set_irq_wr_callback(*device, DEVCB_##_write);
#define MCFG_MC6852_SM_DTR_CALLBACK(_write) \
devcb = &mc6852_device::set_sm_dtr_wr_callback(*device, DEVCB_##_write);
#define MCFG_MC6852_TUF_CALLBACK(_write) \
devcb = &mc6852_device::set_tuf_wr_callback(*device, DEVCB_##_write);
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> mc6852_device
class mc6852_device : public device_t,
public device_serial_interface
{
public:
// construction/destruction
mc6852_device(const machine_config &mconfig, std::string tag, device_t *owner, UINT32 clock);
static void set_rx_clock(device_t &device, int clock) { downcast<mc6852_device &>(device).m_rx_clock = clock; }
static void set_tx_clock(device_t &device, int clock) { downcast<mc6852_device &>(device).m_tx_clock = clock; }
template<class _Object> static devcb_base &set_tx_data_wr_callback(device_t &device, _Object object) { return downcast<mc6852_device &>(device).m_write_tx_data.set_callback(object); }
template<class _Object> static devcb_base &set_irq_wr_callback(device_t &device, _Object object) { return downcast<mc6852_device &>(device).m_write_irq.set_callback(object); }
template<class _Object> static devcb_base &set_sm_dtr_wr_callback(device_t &device, _Object object) { return downcast<mc6852_device &>(device).m_write_sm_dtr.set_callback(object); }
template<class _Object> static devcb_base &set_tuf_wr_callback(device_t &device, _Object object) { return downcast<mc6852_device &>(device).m_write_tuf.set_callback(object); }
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
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;
virtual void device_timer(emu_timer &timer, device_timer_id id, int m_param, void *ptr) override;
// device_serial_interface overrides
virtual void tra_callback() override;
virtual void tra_complete() override;
virtual void rcv_complete() override;
private:
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 m_status; // status register
UINT8 m_cr[3]; // control registers
UINT8 m_scr; // sync code register
UINT8 m_tdr; // transmit data register
UINT8 m_tsr; // transmit shift register
UINT8 m_rdr; // receive data register
UINT8 m_rsr; // receive shift register
std::queue<UINT8> m_rx_fifo;
std::queue<UINT8> 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
extern const device_type MC6852;
#endif