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root/cebix/Frodo4/Src/IEC.h
Revision: 1.1
Committed: 2003-07-01T17:09:43Z (20 years, 9 months ago) by cebix
Content type: text/plain
Branch: MAIN
Log Message:
imported files

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# User Rev Content
1 cebix 1.1 /*
2     * IEC.h - IEC bus routines, 1541 emulation (DOS level)
3     *
4     * Frodo (C) 1994-1997,2002 Christian Bauer
5     *
6     * This program is free software; you can redistribute it and/or modify
7     * it under the terms of the GNU General Public License as published by
8     * the Free Software Foundation; either version 2 of the License, or
9     * (at your option) any later version.
10     *
11     * This program is distributed in the hope that it will be useful,
12     * but WITHOUT ANY WARRANTY; without even the implied warranty of
13     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14     * GNU General Public License for more details.
15     *
16     * You should have received a copy of the GNU General Public License
17     * along with this program; if not, write to the Free Software
18     * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19     */
20    
21     #ifndef _IEC_H
22     #define _IEC_H
23    
24    
25     // Maximum length of file names
26     const int NAMEBUF_LENGTH = 256;
27    
28    
29     // C64 status codes
30     enum {
31     ST_OK = 0, // No error
32     ST_READ_TIMEOUT = 0x02, // Timeout on reading
33     ST_TIMEOUT = 0x03, // Timeout
34     ST_EOF = 0x40, // End of file
35     ST_NOTPRESENT = 0x80 // Device not present
36     };
37    
38    
39     // 1541 error codes
40     enum {
41     ERR_OK, // 00 OK
42     ERR_WRITEERROR, // 25 WRITE ERROR
43     ERR_WRITEPROTECT, // 26 WRITE PROTECT ON
44     ERR_SYNTAX30, // 30 SYNTAX ERROR (unknown command)
45     ERR_SYNTAX33, // 33 SYNTAX ERROR (wildcards on writing)
46     ERR_WRITEFILEOPEN, // 60 WRITE FILE OPEN
47     ERR_FILENOTOPEN, // 61 FILE NOT OPEN
48     ERR_FILENOTFOUND, // 62 FILE NOT FOUND
49     ERR_ILLEGALTS, // 67 ILLEGAL TRACK OR SECTOR
50     ERR_NOCHANNEL, // 70 NO CHANNEL
51     ERR_STARTUP, // 73 Power-up message
52     ERR_NOTREADY // 74 DRIVE NOT READY
53     };
54    
55    
56     // IEC command codes
57     enum {
58     CMD_DATA = 0x60, // Data transfer
59     CMD_CLOSE = 0xe0, // Close channel
60     CMD_OPEN = 0xf0 // Open channel
61     };
62    
63    
64     // IEC ATN codes
65     enum {
66     ATN_LISTEN = 0x20,
67     ATN_UNLISTEN = 0x30,
68     ATN_TALK = 0x40,
69     ATN_UNTALK = 0x50
70     };
71    
72    
73     // Drive LED states
74     enum {
75     DRVLED_OFF, // Inactive, LED off
76     DRVLED_ON, // Active, LED on
77     DRVLED_ERROR // Error, blink LED
78     };
79    
80    
81     class Drive;
82     class C64Display;
83     class Prefs;
84    
85     // Class for complete IEC bus system with drives 8..11
86     class IEC {
87     public:
88     IEC(C64Display *display);
89     ~IEC();
90    
91     void Reset(void);
92     void NewPrefs(Prefs *prefs);
93     void UpdateLEDs(void);
94    
95     uint8 Out(uint8 byte, bool eoi);
96     uint8 OutATN(uint8 byte);
97     uint8 OutSec(uint8 byte);
98     uint8 In(uint8 *byte);
99     void SetATN(void);
100     void RelATN(void);
101     void Turnaround(void);
102     void Release(void);
103    
104     private:
105     uint8 listen(int device);
106     uint8 talk(int device);
107     uint8 unlisten(void);
108     uint8 untalk(void);
109     uint8 sec_listen(void);
110     uint8 sec_talk(void);
111     uint8 open_out(uint8 byte, bool eoi);
112     uint8 data_out(uint8 byte, bool eoi);
113     uint8 data_in(uint8 *byte);
114    
115     C64Display *the_display; // Pointer to display object (for drive LEDs)
116    
117     char name_buf[NAMEBUF_LENGTH]; // Buffer for file names and command strings
118     char *name_ptr; // Pointer for reception of file name
119     int name_len; // Received length of file name
120    
121     Drive *drive[4]; // 4 drives (8..11)
122    
123     Drive *listener; // Pointer to active listener
124     Drive *talker; // Pointer to active talker
125    
126     bool listener_active; // Listener selected, listener_data is valid
127     bool talker_active; // Talker selected, talker_data is valid
128     bool listening; // Last ATN was listen (to decide between sec_listen/sec_talk)
129    
130     uint8 received_cmd; // Received command code ($x0)
131     uint8 sec_addr; // Received secondary address ($0x)
132     };
133    
134    
135     // Abstract superclass for individual drives
136     class Drive {
137     public:
138     Drive(IEC *iec);
139     virtual ~Drive() {}
140    
141     virtual uint8 Open(int channel, char *filename)=0;
142     virtual uint8 Close(int channel)=0;
143     virtual uint8 Read(int channel, uint8 *byte)=0;
144     virtual uint8 Write(int channel, uint8 byte, bool eoi)=0;
145     virtual void Reset(void)=0;
146    
147     int LED; // Drive LED state
148     bool Ready; // Drive is ready for operation
149    
150     protected:
151     void set_error(int error);
152    
153     char *error_ptr; // Pointer within error message
154     int error_len; // Remaining length of error message
155    
156     private:
157     IEC *the_iec; // Pointer to IEC object
158     };
159    
160     #endif