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
|
/****************************************************************************
serial.h
Code for handling serial port image devices
****************************************************************************/
#ifndef __SERIAL_H__
#define __SERIAL_H__
#include "diimage.h"
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
// ======================> serial_data_stream
struct serial_data_stream
{
/* pointer to buffer */
UINT8 *pData;
/* length of buffer */
unsigned long DataLength;
/* bit offset within current byte */
unsigned long BitCount;
/* byte offset within data */
unsigned long ByteCount;
};
// ======================> serial_image_interface
struct serial_image_interface
{
int m_baud_rate;
int m_data_bits;
int m_stop_bits;
int m_parity;
bool m_transmit_on_start;
const char *m_tag_connected;
};
// ======================> serial_image_device
class serial_image_device : public device_t,
public serial_image_interface,
public device_serial_interface,
public device_image_interface
{
public:
// construction/destruction
serial_image_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
virtual ~serial_image_device();
// image-level overrides
virtual bool call_load();
virtual void call_unload();
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 ""; }
virtual const option_guide *create_option_guide() const { return NULL; }
// specific implementation
void timer_callback();
virtual void input_callback(UINT8 state);
void sent_char();
void set_transmit_state(int state);
int load_internal(unsigned char **ptr, int *pDataSize);
// data stream
int data_stream_get_data_bit_from_data_byte(serial_data_stream *stream);
void data_stream_reset(serial_data_stream *stream);
void data_stream_free(serial_data_stream *stream);
void data_stream_init(serial_data_stream *stream, unsigned char *pData, unsigned long DataLength) ;
protected:
// device-level overrides
virtual void device_config_complete();
virtual void device_start();
private:
/* transmit data bit-stream */
serial_data_stream m_transmit;
/* receive data bit-stream */
serial_data_stream m_receive;
int m_transmit_state;
/* baud rate timer */
emu_timer *m_timer;
};
// device type definition
extern const device_type SERIAL;
#define MCFG_SERIAL_ADD(_tag,_config) \
MCFG_DEVICE_ADD(_tag, SERIAL, 0) \
MCFG_DEVICE_CONFIG(_config)
#endif /* __SERIAL_H__ */
|