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Diffstat (limited to 'trunk/src/emu/video/mc6845.h')
-rw-r--r-- | trunk/src/emu/video/mc6845.h | 374 |
1 files changed, 374 insertions, 0 deletions
diff --git a/trunk/src/emu/video/mc6845.h b/trunk/src/emu/video/mc6845.h new file mode 100644 index 00000000000..d7ef6be2300 --- /dev/null +++ b/trunk/src/emu/video/mc6845.h @@ -0,0 +1,374 @@ +/********************************************************************** + + Motorola MC6845 and compatible CRT controller emulation + + Copyright Nicola Salmoria and the MAME Team. + Visit http://mamedev.org for licensing and usage restrictions. + +**********************************************************************/ + +#ifndef __MC6845__ +#define __MC6845__ + +#include "emu.h" +#include "machine/devhelpr.h" + + +#define MC6845_INTERFACE(name) \ + const mc6845_interface (name) = + +#define MCFG_MC6845_ADD(_tag, _variant, _clock, _config) \ + MCFG_DEVICE_ADD(_tag, _variant, _clock) \ + MCFG_DEVICE_CONFIG(_config) + + +class mc6845_device; + +/* callback definitions */ +typedef void * (*mc6845_begin_update_func)(mc6845_device *device, bitmap_t *bitmap, const rectangle *cliprect); +#define MC6845_BEGIN_UPDATE(name) void *name(mc6845_device *device, bitmap_t *bitmap, const rectangle *cliprect) + + +typedef void (*mc6845_update_row_func)(mc6845_device *device, bitmap_t *bitmap, + const rectangle *cliprect, UINT16 ma, UINT8 ra, + UINT16 y, UINT8 x_count, INT8 cursor_x, void *param); + + +#define MC6845_UPDATE_ROW(name) void name(mc6845_device *device, bitmap_t *bitmap, \ + const rectangle *cliprect, UINT16 ma, UINT8 ra, \ + UINT16 y, UINT8 x_count, INT8 cursor_x, void *param) + + +typedef void (*mc6845_end_update_func)(mc6845_device *device, bitmap_t *bitmap, const rectangle *cliprect, void *param); +#define MC6845_END_UPDATE(name) void name(mc6845_device *device, bitmap_t *bitmap, const rectangle *cliprect, void *param) + + +typedef void (*mc6845_on_update_addr_changed_func)(mc6845_device *device, int address, int strobe); +#define MC6845_ON_UPDATE_ADDR_CHANGED(name) void name(mc6845_device *device, int address, int strobe) + + +/* interface */ +typedef struct _mc6845_interface mc6845_interface; +struct _mc6845_interface +{ + const char *m_screen_tag; /* screen we are acting on */ + int m_hpixels_per_column; /* number of pixels per video memory address */ + + /* if specified, this gets called before any pixel update, + optionally return a pointer that will be passed to the + update and tear down callbacks */ + mc6845_begin_update_func m_begin_update; + + /* this gets called for every row, the driver must output + x_count * hpixels_per_column pixels. + cursor_x indicates the character position where the cursor is, or -1 + if there is no cursor on this row */ + mc6845_update_row_func m_update_row; + + /* if specified, this gets called after all row updating is complete */ + mc6845_end_update_func m_end_update; + + /* if specified, this gets called for every change of the disply enable pin (pin 18) */ + devcb_write_line m_out_de_func; + + /* if specified, this gets called for every change of the cursor pin (pin 19) */ + devcb_write_line m_out_cur_func; + + /* if specified, this gets called for every change of the HSYNC pin (pin 39) */ + devcb_write_line m_out_hsync_func; + + /* if specified, this gets called for every change of the VSYNC pin (pin 40) */ + devcb_write_line m_out_vsync_func; + + /* Called whenenever the update address changes + * For vblank/hblank timing strobe indicates the physical update. + * vblank/hblank timing not supported yet! */ + + mc6845_on_update_addr_changed_func m_on_update_addr_changed; +}; + + +class mc6845_device : public device_t, + public mc6845_interface +{ + friend class mc6845_1_device; + friend class r6545_1_device; + friend class c6545_1_device; + friend class h46505_device; + friend class hd6845_device; + friend class sy6545_1_device; + friend class sy6845e_device; + friend class hd6345_device; + friend class ams40041_device; + +public: + // construction/destruction + mc6845_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + mc6845_device(const machine_config &mconfig, device_type type, const char *name, const char *tag, device_t *owner, UINT32 clock); + + /* select one of the registers for reading or writing */ + DECLARE_WRITE8_MEMBER( address_w ); + + /* read from the status register */ + DECLARE_READ8_MEMBER( status_r ); + + /* read from the currently selected register */ + DECLARE_READ8_MEMBER( register_r ); + + /* write to the currently selected register */ + DECLARE_WRITE8_MEMBER( register_w ); + + // read display enable line state + DECLARE_READ_LINE_MEMBER( de_r ); + + // read cursor line state + DECLARE_READ_LINE_MEMBER( cursor_r ); + + // read horizontal sync line state + DECLARE_READ_LINE_MEMBER( hsync_r ); + + // read vertical sync line state + DECLARE_READ_LINE_MEMBER( vsync_r ); + + /* return the current value on the MA0-MA13 pins */ + UINT16 get_ma(); + + /* return the current value on the RA0-RA4 pins */ + UINT8 get_ra(); + + /* simulates the LO->HI clocking of the light pen pin (pin 3) */ + void assert_light_pen_input(); + + /* set the clock (pin 21) of the chip */ + void set_clock(int clock); + + /* set number of pixels per video memory address */ + void set_hpixels_per_column(int hpixels_per_column); + + /* updates the screen -- this will call begin_update(), + followed by update_row() reapeatedly and after all row + updating is complete, end_update() */ + void update(bitmap_t *bitmap, const rectangle *cliprect); + +protected: + // device-level overrides + virtual void device_config_complete(); + virtual void device_start(); + virtual void device_reset(); + virtual void device_post_load(); + virtual void device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr); + +private: + bool m_supports_disp_start_addr_r; + bool m_supports_vert_sync_width; + bool m_supports_status_reg_d5; + bool m_supports_status_reg_d6; + bool m_supports_status_reg_d7; + bool m_supports_transparent; + + devcb_resolved_write_line m_res_out_de_func; + devcb_resolved_write_line m_res_out_cur_func; + devcb_resolved_write_line m_res_out_hsync_func; + devcb_resolved_write_line m_res_out_vsync_func; + + int m_device_type; + screen_device *m_screen; + + /* register file */ + UINT8 m_horiz_char_total; /* 0x00 */ + UINT8 m_horiz_disp; /* 0x01 */ + UINT8 m_horiz_sync_pos; /* 0x02 */ + UINT8 m_sync_width; /* 0x03 */ + UINT8 m_vert_char_total; /* 0x04 */ + UINT8 m_vert_total_adj; /* 0x05 */ + UINT8 m_vert_disp; /* 0x06 */ + UINT8 m_vert_sync_pos; /* 0x07 */ + UINT8 m_mode_control; /* 0x08 */ + UINT8 m_max_ras_addr; /* 0x09 */ + UINT8 m_cursor_start_ras; /* 0x0a */ + UINT8 m_cursor_end_ras; /* 0x0b */ + UINT16 m_disp_start_addr; /* 0x0c/0x0d */ + UINT16 m_cursor_addr; /* 0x0e/0x0f */ + UINT16 m_light_pen_addr; /* 0x10/0x11 */ + UINT16 m_update_addr; /* 0x12/0x13 */ + + /* other internal state */ + UINT8 m_register_address_latch; + bool m_cursor_state; + UINT8 m_cursor_blink_count; + bool m_update_ready_bit; + /* output signals */ + int m_cur; + int m_hsync; + int m_vsync; + int m_de; + + /* internal counters */ + UINT8 m_character_counter; /* Not used yet */ + UINT8 m_hsync_width_counter; /* Not used yet */ + UINT8 m_line_counter; + UINT8 m_raster_counter; + UINT8 m_adjust_counter; + UINT8 m_vsync_width_counter; + + bool m_line_enable_ff; /* Internal flip flop which is set when the line_counter is reset and reset when vert_disp is reached */ + UINT8 m_vsync_ff; + UINT8 m_adjust_active; + UINT16 m_line_address; + INT16 m_cursor_x; + + /* timers */ + static const device_timer_id TIMER_LINE = 0; + static const device_timer_id TIMER_DE_OFF = 1; + static const device_timer_id TIMER_CUR_ON = 2; + static const device_timer_id TIMER_CUR_OFF = 3; + static const device_timer_id TIMER_HSYNC_ON = 4; + static const device_timer_id TIMER_HSYNC_OFF = 5; + static const device_timer_id TIMER_LIGHT_PEN_LATCH = 6; + static const device_timer_id TIMER_UPD_ADR = 7; + static const device_timer_id TIMER_UPD_TRANS = 8; + + emu_timer *m_line_timer; + emu_timer *m_de_off_timer; + emu_timer *m_cur_on_timer; + emu_timer *m_cur_off_timer; + emu_timer *m_hsync_on_timer; + emu_timer *m_hsync_off_timer; + emu_timer *m_light_pen_latch_timer; + emu_timer *m_upd_adr_timer; + emu_timer *m_upd_trans_timer; + + /* computed values - do NOT state save these! */ + /* These computed are used to define the screen parameters for a driver */ + UINT16 m_horiz_pix_total; + UINT16 m_vert_pix_total; + UINT16 m_max_visible_x; + UINT16 m_max_visible_y; + UINT16 m_hsync_on_pos; + UINT16 m_hsync_off_pos; + UINT16 m_vsync_on_pos; + UINT16 m_vsync_off_pos; + bool m_has_valid_parameters; + + UINT16 m_current_disp_addr; /* the display address currently drawn (used only in mc6845_update) */ + + bool m_light_pen_latched; + attotime m_upd_time; + + void update_upd_adr_timer(); + void call_on_update_address(int strobe); + void recompute_parameters(bool postload); + void update_counters(); + void set_de(int state); + void set_hsync(int state); + void set_vsync(int state); + void set_cur(int state); + void handle_line_timer(); + void update_cursor_state(); +}; + + +class mc6845_1_device : public mc6845_device +{ +public: + mc6845_1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class r6545_1_device : public mc6845_device +{ +public: + r6545_1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class c6545_1_device : public mc6845_device +{ +public: + c6545_1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class h46505_device : public mc6845_device +{ +public: + h46505_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class hd6845_device : public mc6845_device +{ +public: + hd6845_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class sy6545_1_device : public mc6845_device +{ +public: + sy6545_1_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class sy6845e_device : public mc6845_device +{ +public: + sy6845e_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class hd6345_device : public mc6845_device +{ +public: + hd6345_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + +class ams40041_device : public mc6845_device +{ +public: + ams40041_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock); + +protected: + virtual void device_start(); + virtual void device_reset(); +}; + + +extern const device_type MC6845; +extern const device_type MC6845_1; +extern const device_type R6545_1; +extern const device_type C6545_1; +extern const device_type H46505; +extern const device_type HD6845; +extern const device_type SY6545_1; +extern const device_type SY6845E; +extern const device_type HD6345; +extern const device_type AMS40041; + + +#endif |