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// license:BSD-3-Clause
// copyright-holders:Sandro Ronco
/****************************************************************************
pce220_ser.h
Sharp PC-E220/PC-G850V Serial I/O
****************************************************************************/
#ifndef __PCE220_SER_H__
#define __PCE220_SER_H__
/***************************************************************************
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 clock);
virtual ~pce220_serial_device();
// image-level overrides
virtual bool call_load();
virtual void call_unload();
virtual bool call_create(int format_type, option_resolution *format_options);
virtual iodevice_t image_type() const { return IO_SERIAL; }
virtual bool is_readable() const { return 1; }
virtual bool is_writeable() const { return 1; }
virtual bool is_creatable() const { return 1; }
virtual bool must_be_loaded() const { return 0; }
virtual bool is_reset_on_load() const { return 0; }
virtual const char *image_interface() const { return NULL; }
virtual const char *file_extensions() const { return "txt,ihx"; }
virtual const option_guide *create_option_guide() const { return NULL; }
// specific implementation
UINT8 in_xin(void) { return m_xin & 0x01; }
UINT8 in_din(void) { return m_din & 0x01; }
UINT8 in_ack(void) { return m_ack & 0x01; }
void out_busy(UINT8 state) { m_busy = state & 0x01; }
void out_dout(UINT8 state) { m_dout = state & 0x01; }
void out_xout(UINT8 state) { m_xout = state & 0x01; }
void enable_interface(UINT8 state) { m_enabled = state & 0x01; }
protected:
// internal helpers
int calc_parity(UINT8 data);
int get_next_state();
// device-level overrides
virtual void device_start();
virtual void device_reset();
virtual void device_config_complete();
virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
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 m_state; // transfer status
UINT32 m_bytes_count; // number of bytes transferred
UINT8 m_current_byte; // byte in transfer
UINT8 m_enabled; // enable/disable
UINT8 m_busy; // CTS
UINT8 m_dout; // DTR
UINT8 m_xout; // TXD
UINT8 m_xin; // RXD
UINT8 m_din; // DSR
UINT8 m_ack; // RTS
};
// device type definition
extern const device_type PCE220SERIAL;
/***************************************************************************
DEVICE CONFIGURATION MACROS
***************************************************************************/
#define PCE220SERIAL_TAG "serial"
#define MCFG_PCE220_SERIAL_ADD(_tag) \
MCFG_DEVICE_ADD(_tag, PCE220SERIAL, 0)
#endif /* __PCE220_SER_H__ */
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