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// 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
CR_WM = 0x7f, // write mask
};
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) ATTR_COLD;
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)) & ADDRESS_MASK; }
u8 ram_r();
void ram_w(u8 data);
u8 reg_r();
void reg_w(u8 data);
bool cur_r(unsigned x, unsigned y) const;
protected:
static constexpr u16 ADDRESS_MASK = 0x01ff;
// device_t overrides
virtual void device_start() override ATTR_COLD;
virtual void device_reset() override ATTR_COLD;
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
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