mirror of
https://github.com/Oibaf66/frodo-wii.git
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147 lines
3.3 KiB
C++
147 lines
3.3 KiB
C++
/*
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* IEC.h - IEC bus routines, 1541 emulation (DOS level)
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*
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* Frodo (C) 1994-1997,2002 Christian Bauer
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*/
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#ifndef _IEC_H
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#define _IEC_H
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// Maximum length of file names
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const int NAMEBUF_LENGTH = 256;
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// C64 status codes
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enum {
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ST_OK = 0, // No error
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ST_READ_TIMEOUT = 0x02, // Timeout on reading
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ST_TIMEOUT = 0x03, // Timeout
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ST_EOF = 0x40, // End of file
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ST_NOTPRESENT = 0x80 // Device not present
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};
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// 1541 error codes
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enum {
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ERR_OK, // 00 OK
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ERR_WRITEERROR, // 25 WRITE ERROR
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ERR_WRITEPROTECT, // 26 WRITE PROTECT ON
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ERR_SYNTAX30, // 30 SYNTAX ERROR (unknown command)
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ERR_SYNTAX33, // 33 SYNTAX ERROR (wildcards on writing)
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ERR_WRITEFILEOPEN, // 60 WRITE FILE OPEN
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ERR_FILENOTOPEN, // 61 FILE NOT OPEN
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ERR_FILENOTFOUND, // 62 FILE NOT FOUND
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ERR_ILLEGALTS, // 67 ILLEGAL TRACK OR SECTOR
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ERR_NOCHANNEL, // 70 NO CHANNEL
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ERR_STARTUP, // 73 Power-up message
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ERR_NOTREADY // 74 DRIVE NOT READY
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};
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// IEC command codes
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enum {
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CMD_DATA = 0x60, // Data transfer
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CMD_CLOSE = 0xe0, // Close channel
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CMD_OPEN = 0xf0 // Open channel
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};
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// IEC ATN codes
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enum {
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ATN_LISTEN = 0x20,
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ATN_UNLISTEN = 0x30,
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ATN_TALK = 0x40,
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ATN_UNTALK = 0x50
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};
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// Drive LED states
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enum {
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DRVLED_OFF, // Inactive, LED off
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DRVLED_ON, // Active, LED on
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DRVLED_ERROR // Error, blink LED
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};
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class Drive;
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class C64Display;
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class Prefs;
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// Class for complete IEC bus system with drives 8..11
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class IEC {
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public:
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IEC(C64Display *display);
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~IEC();
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void Reset(void);
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void NewPrefs(Prefs *prefs);
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void UpdateLEDs(void);
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uint8 Out(uint8 byte, bool eoi);
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uint8 OutATN(uint8 byte);
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uint8 OutSec(uint8 byte);
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uint8 In(uint8 *byte);
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void SetATN(void);
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void RelATN(void);
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void Turnaround(void);
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void Release(void);
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private:
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uint8 listen(int device);
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uint8 talk(int device);
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uint8 unlisten(void);
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uint8 untalk(void);
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uint8 sec_listen(void);
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uint8 sec_talk(void);
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uint8 open_out(uint8 byte, bool eoi);
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uint8 data_out(uint8 byte, bool eoi);
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uint8 data_in(uint8 *byte);
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C64Display *the_display; // Pointer to display object (for drive LEDs)
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char name_buf[NAMEBUF_LENGTH]; // Buffer for file names and command strings
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char *name_ptr; // Pointer for reception of file name
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int name_len; // Received length of file name
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Drive *drive[4]; // 4 drives (8..11)
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Drive *listener; // Pointer to active listener
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Drive *talker; // Pointer to active talker
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bool listener_active; // Listener selected, listener_data is valid
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bool talker_active; // Talker selected, talker_data is valid
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bool listening; // Last ATN was listen (to decide between sec_listen/sec_talk)
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uint8 received_cmd; // Received command code ($x0)
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uint8 sec_addr; // Received secondary address ($0x)
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};
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// Abstract superclass for individual drives
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class Drive {
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public:
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Drive(IEC *iec);
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virtual ~Drive() {}
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virtual uint8 Open(int channel, char *filename)=0;
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virtual uint8 Close(int channel)=0;
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virtual uint8 Read(int channel, uint8 *byte)=0;
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virtual uint8 Write(int channel, uint8 byte, bool eoi)=0;
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virtual void Reset(void)=0;
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int LED; // Drive LED state
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bool Ready; // Drive is ready for operation
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protected:
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void set_error(int error);
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char *error_ptr; // Pointer within error message
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int error_len; // Remaining length of error message
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private:
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IEC *the_iec; // Pointer to IEC object
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};
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#endif
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