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// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/****************************************************************************
pce220_ser.h
Sharp PC-E220/PC-G850V Serial I/O
****************************************************************************/
#ifndef MAME_MACHINE_PCE220_SER_H
#define MAME_MACHINE_PCE220_SER_H
#pragma once
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> pce220_serial_device
class pce220_serial_device : public device_t,
public device_image_interface
{
public:
// construction/destruction
pce220_serial_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
virtual ~pce220_serial_device();
// image-level overrides
virtual image_init_result call_load() override;
virtual void call_unload() override;
virtual image_init_result call_create(int format_type, util::option_resolution *format_options) override;
virtual iodevice_t image_type() const noexcept override { return IO_SERIAL; }
virtual bool is_readable() const noexcept override { return true; }
virtual bool is_writeable() const noexcept override { return true; }
virtual bool is_creatable() const noexcept override { return true; }
virtual bool must_be_loaded() const noexcept override { return false; }
virtual bool is_reset_on_load() const noexcept override { return false; }
virtual const char *file_extensions() const noexcept override { return "txt,ihx"; }
// specific implementation
uint8_t in_xin(void) { return m_xin & 0x01; }
uint8_t in_din(void) { return m_din & 0x01; }
uint8_t in_ack(void) { return m_ack & 0x01; }
void out_busy(uint8_t state) { m_busy = state & 0x01; }
void out_dout(uint8_t state) { m_dout = state & 0x01; }
void out_xout(uint8_t state) { m_xout = state & 0x01; }
void enable_interface(uint8_t state) { m_enabled = state & 0x01; }
protected:
// internal helpers
int calc_parity(uint8_t data);
int get_next_state();
// 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 param, void *ptr) override;
private:
// internal device state
static const device_timer_id TIMER_SEND = 0;
static const device_timer_id TIMER_RECEIVE = 1;
emu_timer* m_send_timer; // timer for send data
emu_timer* m_receive_timer; // timer for receive data
uint8_t m_state; // transfer status
uint32_t m_bytes_count; // number of bytes transferred
uint8_t m_current_byte; // byte in transfer
uint8_t m_enabled; // enable/disable
uint8_t m_busy; // CTS
uint8_t m_dout; // DTR
uint8_t m_xout; // TXD
uint8_t m_xin; // RXD
uint8_t m_din; // DSR
uint8_t m_ack; // RTS
};
// device type definition
DECLARE_DEVICE_TYPE(PCE220SERIAL, pce220_serial_device)
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define PCE220SERIAL_TAG "serial"
#endif // MAME_MACHINE_PCE220_SER_H
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