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Diffstat (limited to 'plugins/sid/sidplay-libs/libsidplay/src/mos6526/mos6526.h')
| -rw-r--r-- | plugins/sid/sidplay-libs/libsidplay/src/mos6526/mos6526.h | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/plugins/sid/sidplay-libs/libsidplay/src/mos6526/mos6526.h b/plugins/sid/sidplay-libs/libsidplay/src/mos6526/mos6526.h new file mode 100644 index 00000000..5fa11bcf --- /dev/null +++ b/plugins/sid/sidplay-libs/libsidplay/src/mos6526/mos6526.h @@ -0,0 +1,156 @@ +/*************************************************************************** + mos6526.h - CIA timer to produce interrupts + ------------------- + begin : Wed Jun 7 2000 + copyright : (C) 2000 by Simon White + email : s_a_white@email.com + ***************************************************************************/ + +/*************************************************************************** + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + ***************************************************************************/ +/*************************************************************************** + * $Log: mos6526.h,v $ + * Revision 1.11 2002/12/16 22:12:27 s_a_white + * Simulate serial input from data port A to prevent kernel lockups. + * + * Revision 1.10 2002/10/02 19:49:22 s_a_white + * Revert previous change as was incorrect. + * + * Revision 1.9 2002/09/11 22:30:47 s_a_white + * Counter interval writes now go to a new register call prescaler. This is + * copied to the timer latch/counter as appropriate. + * + * Revision 1.8 2002/07/20 08:34:52 s_a_white + * Remove unnecessary and pointless conts. + * + * Revision 1.7 2001/10/18 22:35:45 s_a_white + * GCC3 fixes. + * + * Revision 1.6 2001/07/14 16:46:59 s_a_white + * Sync with sidbuilder class project. + * + * Revision 1.5 2001/07/14 13:03:33 s_a_white + * Now uses new component classes and event generation. + * + * Revision 1.4 2001/03/25 19:50:16 s_a_white + * Timer B counts timer Aer a underflows correc + * + * Revision 1.3 2001/03/23 23:20:29 s_a_white + * Removed redundant reset prototype. + * + * Revision 1.2 2001/03/22 22:41:45 s_a_white + * Replaced tab characters + * + * Revision 1.1 2001/03/21 22:41:45 s_a_white + * Non faked CIA emulation with NMI support. Removal of Hacked VIC support + * off CIA timer. + * + * Revision 1.7 2001/03/09 23:44:30 s_a_white + * Integrated more 6526 features. All timer modes and interrupts correctly + * supported. + * + * Revision 1.6 2001/02/21 22:07:10 s_a_white + * Prevent re-triggering of interrupt if it's already active. + * + * Revision 1.5 2001/02/13 21:00:01 s_a_white + * Support for real interrupts. + * + * Revision 1.3 2000/12/11 18:52:12 s_a_white + * Conversion to AC99 + * + ***************************************************************************/ + +#ifndef _mos6526_h_ +#define _mos6526_h_ + +#include "component.h" +#include "event.h" + +class MOS6526: public component +{ +private: + static const char *credit; + +protected: + uint8_t regs[0x10]; + bool cnt_high; + + // Timer A + uint8_t cra, cra_latch, dpa; + uint_least16_t ta, ta_latch; + int ta_state; + + // Timer B + uint8_t crb; + uint_least16_t tb, tb_latch; + + uint8_t icr, idr; // Interrupt Control Register + event_clock_t m_accessClk; + EventContext &event_context; + + class EventTa: public Event + { + private: + MOS6526 &m_cia; + void event (void) {m_cia.ta_event ();} + + public: + EventTa (MOS6526 *cia) + :Event("CIA Timer A"), + m_cia(*cia) {} + } event_ta; + + /* + class EventStateMachineA: public Event + { + private: + MOS6526 &m_cia; + void event (void) {m_cia.cra_event ();} + + public: + EventStateMachineA (MOS6526 *cia) + :Event("CIA Timer A (State Machine)"), + m_cia(*cia) {} + } event_stateMachineA; +*/ + class EventTb: public Event + { + private: + MOS6526 &m_cia; + void event (void) {m_cia.tb_event ();} + + public: + EventTb (MOS6526 *cia) + :Event("CIA Timer B"), + m_cia(*cia) {} + } event_tb; + + friend class EventTa; +// friend class EventStateMachineA; + friend class EventTb; + +protected: + MOS6526 (EventContext *context); + void ta_event (void); + void tb_event (void); + void trigger (int irq); +// void stateMachineA_event (void); + + // Environment Interface + virtual void interrupt (bool state) = 0; + +public: + // Component Standard Calls + void reset (void); + uint8_t read (uint_least8_t addr); + void write (uint_least8_t addr, uint8_t data); + const char *credits (void) {return credit;} +}; + +#endif // _mos6526_h_ |