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Diffstat (limited to 'src/devices/video/bt431.h')
-rw-r--r-- | src/devices/video/bt431.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/src/devices/video/bt431.h b/src/devices/video/bt431.h new file mode 100644 index 00000000000..86241a8d87b --- /dev/null +++ b/src/devices/video/bt431.h @@ -0,0 +1,95 @@ +// license:BSD-3-Clause +// copyright-holders:Patrick Mackinlay + +#ifndef MAME_VIDEO_BT431_H +#define MAME_VIDEO_BT431_H + +#pragma once + +class bt431_device : public device_t +{ +public: + bt431_device(machine_config const &mconfig, char const *tag, device_t *owner, u32 clock); + + enum register_number : unsigned + { + REG_COMMAND = 0, + REG_CURSOR_X_LO = 1, + REG_CURSOR_X_HI = 2, + REG_CURSOR_Y_LO = 3, + REG_CURSOR_Y_HI = 4, + REG_WINDOW_X_LO = 5, + REG_WINDOW_X_HI = 6, + REG_WINDOW_Y_LO = 7, + REG_WINDOW_Y_HI = 8, + REG_WINDOW_W_LO = 9, + REG_WINDOW_W_HI = 10, + REG_WINDOW_H_LO = 11, + REG_WINDOW_H_HI = 12, + }; + + enum command_mask : u8 + { + CR_D1D0 = 0x03, // cross hair cursor thickness + CR_D3D2 = 0x0c, // multiplex control + CR_D4 = 0x10, // cursor format control + CR_D5 = 0x20, // cross hair cursor enable + CR_D6 = 0x40, // 64x64 cursor enable + }; + + enum cr_d1d0_mask : u8 + { + CR_D1D0_1PIX = 0x00, // 1 pixel + CR_D1D0_3PIX = 0x01, // 3 pixels + CR_D1D0_5PIX = 0x02, // 5 pixels + CR_D1D0_7PIX = 0x03, // 7 pixels + }; + enum cr_d3d2_mask : u8 + { + CR_D3D2_11 = 0x00, // 1:1 multiplexing + CR_D3D2_41 = 0x04, // 4:1 multiplexing + CR_D3D2_51 = 0x08, // 5:1 multiplexing + }; + + void map(address_map &map); + bool cur_r(unsigned x, unsigned y) const; + +protected: + static constexpr u16 ADDRESS_MASK = 0x01ff; + + // device_t overrides + virtual void device_start() override; + virtual void device_reset() override; + + template <unsigned S> u8 addr_r() { return m_address >> S; } + template <unsigned S> void addr_w(u8 data) { m_address = (m_address & (0xff00 >> S)) | (u16(data) << S); } + + u8 ram_r(); + void ram_w(u8 data); + + u8 reg_r(); + void reg_w(u8 data); + +private: + void update(); + + // registers + u16 m_address; + u8 m_command; + u16 m_cursor_x; + u16 m_cursor_y; + u16 m_window_x; + u16 m_window_y; + u16 m_window_w; + u16 m_window_h; + + u8 m_ram[512]; + + rectangle m_bm_window; + rectangle m_ch_h; + rectangle m_ch_v; +}; + +DECLARE_DEVICE_TYPE(BT431, bt431_device) + +#endif // MAME_VIDEO_BT431_H |