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Diffstat (limited to 'trunk/src/emu/machine/6532riot.h')
-rw-r--r-- | trunk/src/emu/machine/6532riot.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/trunk/src/emu/machine/6532riot.h b/trunk/src/emu/machine/6532riot.h new file mode 100644 index 00000000000..88ee8482e93 --- /dev/null +++ b/trunk/src/emu/machine/6532riot.h @@ -0,0 +1,136 @@ +/*************************************************************************** + + RIOT 6532 emulation + +***************************************************************************/ + +#pragma once + +#ifndef __RIOT6532_H__ +#define __RIOT6532_H__ + +#include "emu.h" + + + +//************************************************************************** +// INTERFACE CONFIGURATION MACROS +//************************************************************************** + +#define MCFG_RIOT6532_ADD(_tag, _clock, _intrf) \ + MCFG_DEVICE_ADD(_tag, RIOT6532, _clock) \ + MCFG_DEVICE_CONFIG(_intrf) + + + +/*************************************************************************** + TYPE DEFINITIONS +***************************************************************************/ + + +// ======================> riot6532_interface + +struct riot6532_interface +{ + devcb_read8 m_in_a_cb; + devcb_read8 m_in_b_cb; + devcb_write8 m_out_a_cb; + devcb_write8 m_out_b_cb; + devcb_write_line m_irq_cb; +}; + + + +// ======================> riot6532_device + +class riot6532_device : public device_t, + public riot6532_interface +{ +public: + // construction/destruction + riot6532_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + + DECLARE_READ8_MEMBER( read ); + DECLARE_WRITE8_MEMBER( write ); + + UINT8 reg_r(UINT8 offset); + 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_resolved_read8 m_in_func; + devcb_resolved_write8 m_out_func; + }; + + // device-level overrides + virtual void device_config_complete(); + virtual void device_start(); + virtual void device_reset(); + virtual void device_post_load() { } + virtual void device_clock_changed() { } + + static TIMER_CALLBACK( timer_end_callback ); + +private: + void update_irqstate(); + UINT8 apply_ddr(const riot6532_port *port); + void update_pa7_state(); + UINT8 get_timer(); + + int m_index; + + riot6532_port m_port[2]; + + devcb_resolved_write_line m_irq_func; + + 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; +}; + + +// device type definition +extern const device_type RIOT6532; + + + +/*************************************************************************** + PROTOTYPES +***************************************************************************/ + +READ8_DEVICE_HANDLER( riot6532_r ); +WRITE8_DEVICE_HANDLER( riot6532_w ); + +void riot6532_porta_in_set(device_t *device, UINT8 data, UINT8 mask); +void riot6532_portb_in_set(device_t *device, UINT8 data, UINT8 mask); + +UINT8 riot6532_porta_in_get(device_t *device); +UINT8 riot6532_portb_in_get(device_t *device); + +UINT8 riot6532_porta_out_get(device_t *device); +UINT8 riot6532_portb_out_get(device_t *device); + +#endif |