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-rw-r--r--src/devices/machine/6532riot.h127
1 files changed, 127 insertions, 0 deletions
diff --git a/src/devices/machine/6532riot.h b/src/devices/machine/6532riot.h
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+++ b/src/devices/machine/6532riot.h
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+// license:BSD-3-Clause
+// copyright-holders:Aaron Giles
+/***************************************************************************
+
+ RIOT 6532 emulation
+
+***************************************************************************/
+
+#pragma once
+
+#ifndef __RIOT6532_H__
+#define __RIOT6532_H__
+
+#include "emu.h"
+
+
+//**************************************************************************
+// INTERFACE CONFIGURATION MACROS
+//**************************************************************************
+
+#define MCFG_RIOT6532_IN_PA_CB(_devcb) \
+ devcb = &riot6532_device::set_in_pa_callback(*device, DEVCB_##_devcb);
+
+#define MCFG_RIOT6532_OUT_PA_CB(_devcb) \
+ devcb = &riot6532_device::set_out_pa_callback(*device, DEVCB_##_devcb);
+
+#define MCFG_RIOT6532_IN_PB_CB(_devcb) \
+ devcb = &riot6532_device::set_in_pb_callback(*device, DEVCB_##_devcb);
+
+#define MCFG_RIOT6532_OUT_PB_CB(_devcb) \
+ devcb = &riot6532_device::set_out_pb_callback(*device, DEVCB_##_devcb);
+
+#define MCFG_RIOT6532_IRQ_CB(_devcb) \
+ devcb = &riot6532_device::set_irq_callback(*device, DEVCB_##_devcb);
+
+
+/***************************************************************************
+ TYPE DEFINITIONS
+***************************************************************************/
+
+
+// ======================> riot6532_device
+
+class riot6532_device : public device_t
+{
+public:
+ // construction/destruction
+ riot6532_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock);
+
+ template<class _Object> static devcb_base &set_in_pa_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_in_pa_cb.set_callback(object); }
+ template<class _Object> static devcb_base &set_out_pa_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_out_pa_cb.set_callback(object); }
+ template<class _Object> static devcb_base &set_in_pb_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_in_pb_cb.set_callback(object); }
+ template<class _Object> static devcb_base &set_out_pb_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_out_pb_cb.set_callback(object); }
+ template<class _Object> static devcb_base &set_irq_callback(device_t &device, _Object object) { return downcast<riot6532_device &>(device).m_irq_cb.set_callback(object); }
+
+ DECLARE_READ8_MEMBER( read );
+ DECLARE_WRITE8_MEMBER( write );
+
+ UINT8 reg_r(UINT8 offset, bool debugger_access = false);
+ void reg_w(UINT8 offset, UINT8 data);
+
+ void porta_in_set(UINT8 data, UINT8 mask);
+ void portb_in_set(UINT8 data, UINT8 mask);
+
+ UINT8 porta_in_get();
+ UINT8 portb_in_get();
+
+ UINT8 porta_out_get();
+ UINT8 portb_out_get();
+
+ void timer_end();
+
+protected:
+ class riot6532_port
+ {
+ public:
+ UINT8 m_in;
+ UINT8 m_out;
+ UINT8 m_ddr;
+ devcb_read8 *m_in_cb;
+ devcb_write8 *m_out_cb;
+ };
+
+ // device-level overrides
+ virtual void device_start();
+ virtual void device_reset();
+ virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr);
+ virtual void device_post_load() { }
+ virtual void device_clock_changed() { }
+
+
+private:
+ void update_irqstate();
+ UINT8 apply_ddr(const riot6532_port *port);
+ void update_pa7_state();
+ UINT8 get_timer();
+
+ riot6532_port m_port[2];
+
+ devcb_read8 m_in_pa_cb;
+ devcb_write8 m_out_pa_cb;
+ devcb_read8 m_in_pb_cb;
+ devcb_write8 m_out_pb_cb;
+ devcb_write_line m_irq_cb;
+
+ UINT8 m_irqstate;
+ UINT8 m_irqenable;
+ int m_irq;
+
+ UINT8 m_pa7dir; /* 0x80 = high-to-low, 0x00 = low-to-high */
+ UINT8 m_pa7prev;
+
+ UINT8 m_timershift;
+ UINT8 m_timerstate;
+ emu_timer * m_timer;
+
+ enum
+ {
+ TIMER_END_CB
+ };
+};
+
+
+// device type definition
+extern const device_type RIOT6532;
+
+#endif