// license:BSD-3-Clause // copyright-holders:Ryan Holtz /********************************************************************** Craft, an ATmega88-based demo by Linus Åkesson **********************************************************************/ #include "emu.h" #include "cpu/avr8/avr8.h" #include "sound/dac.h" #include "sound/volt_reg.h" #include "screen.h" #include "emupal.h" #include "speaker.h" #define MASTER_CLOCK 20000000 #define VISIBLE_CYCLES 480 #define HSYNC_CYCLES 155 #define LINE_CYCLES (VISIBLE_CYCLES + HSYNC_CYCLES) #define VISIBLE_LINES 480 #define VSYNC_LINES 45 #define LINES_PER_FRAME (VISIBLE_LINES + VSYNC_LINES) #define CYCLES_PER_FRAME (LINES_PER_FRAME * LINE_CYCLES) #define PIXELS_PER_FRAME (CYCLES_PER_FRAME) class lft_craft_state : public driver_device { public: lft_craft_state(const machine_config &mconfig, device_type type, const char *tag) : driver_device(mconfig, type, tag) , m_maincpu(*this, "maincpu") , m_dac(*this, "dac") , m_screen(*this, "screen") , m_palette(*this, "palette") { } void craft(machine_config &config); protected: virtual void machine_start() override; virtual void machine_reset() override; void prg_map(address_map &map); void data_map(address_map &map); void io_map(address_map &map); uint8_t port_r(offs_t offset); void port_w(offs_t offset, uint8_t data); void init_palette(palette_device &palette) const; void video_update(); uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect); required_device m_maincpu; required_device m_dac; required_device m_screen; required_device m_palette; enum port : uint8_t { PORT_A, PORT_B, PORT_C, PORT_D, PORT_COUNT }; uint8_t m_ports[PORT_COUNT]; uint32_t m_last_cycles; uint64_t m_frame_start_cycle; uint8_t m_latched_color; std::unique_ptr m_pixels; }; //************************************************************************** // GPIO //************************************************************************** uint8_t lft_craft_state::port_r(offs_t offset) { return m_ports[offset]; } void lft_craft_state::port_w(offs_t offset, uint8_t data) { const uint8_t old = m_ports[offset]; m_ports[offset] = data; const uint8_t changed = data ^ old; switch (offset) { case AVR8_IO_PORTB: if (BIT(changed, 1) && BIT(data, 1)) { m_frame_start_cycle = machine().time().as_ticks(MASTER_CLOCK); video_update(); } if (BIT(changed, 3)) { video_update(); m_latched_color = (data & 0x08) ? (m_ports[PORT_C] & 0x3f) : 0x3f; } break; case AVR8_IO_PORTC: video_update(); m_latched_color = data; break; case AVR8_IO_PORTD: m_dac->write((data & 0x02) | ((data & 0xf4) >> 2)); break; } } //************************************************************************** // MEMORY //************************************************************************** void lft_craft_state::prg_map(address_map &map) { map(0x0000, 0x1fff).rom(); } void lft_craft_state::data_map(address_map &map) { map(0x0100, 0x04ff).ram(); } void lft_craft_state::io_map(address_map &map) { map(AVR8_IO_PORTA, AVR8_IO_PORTD).rw(FUNC(lft_craft_state::port_r), FUNC(lft_craft_state::port_w)); } //************************************************************************** // VIDEO //************************************************************************** void lft_craft_state::init_palette(palette_device &palette) const { for (int i = 0; i < 0x40; i++) { uint8_t r = 0x55 * ((i & 0x30) >> 4); uint8_t g = 0x55 * ((i & 0x0c) >> 2); uint8_t b = 0x55 * (i & 0x03); palette.set_pen_color(i, rgb_t(r, g, b)); } } void lft_craft_state::video_update() { uint64_t cycles = machine().time().as_ticks(MASTER_CLOCK); uint32_t frame_cycles = (uint32_t)(cycles - m_frame_start_cycle); if (m_last_cycles < frame_cycles) { for (uint32_t pixidx = m_last_cycles; pixidx < frame_cycles && pixidx < PIXELS_PER_FRAME; pixidx++) { m_pixels[pixidx] = m_latched_color; } } m_last_cycles = frame_cycles; } uint32_t lft_craft_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect) { const pen_t *pens = m_palette->pens(); for(int y = 0; y < LINES_PER_FRAME; y++) { uint32_t *dst = &bitmap.pix32(y); uint8_t *src = &m_pixels[y * LINE_CYCLES]; for(int x = 0; x < LINE_CYCLES; x++) { *dst++ = pens[*src++]; } } return 0; } //************************************************************************** // MACHINE //************************************************************************** static INPUT_PORTS_START( empty_input ) INPUT_PORTS_END void lft_craft_state::machine_start() { m_pixels = std::make_unique(PIXELS_PER_FRAME); save_item(NAME(m_ports)); save_item(NAME(m_last_cycles)); save_item(NAME(m_frame_start_cycle)); save_item(NAME(m_latched_color)); save_pointer(NAME(m_pixels), PIXELS_PER_FRAME); } void lft_craft_state::machine_reset() { memset(m_ports, 0, PORT_COUNT); m_frame_start_cycle = 0; m_last_cycles = 0; m_latched_color = 0; memset(&m_pixels[0], 0, PIXELS_PER_FRAME); } void lft_craft_state::craft(machine_config &config) { ATMEGA88(config, m_maincpu, MASTER_CLOCK); m_maincpu->set_addrmap(AS_PROGRAM, &lft_craft_state::prg_map); m_maincpu->set_addrmap(AS_DATA, &lft_craft_state::data_map); m_maincpu->set_addrmap(AS_IO, &lft_craft_state::io_map); m_maincpu->set_eeprom_tag("eeprom"); PALETTE(config, m_palette, FUNC(lft_craft_state::init_palette), 64); SCREEN(config, m_screen, SCREEN_TYPE_RASTER); m_screen->set_raw(MASTER_CLOCK, 635, 47, 527, 525, 36, 516); m_screen->set_screen_update(FUNC(lft_craft_state::screen_update)); SPEAKER(config, "avr8").front_center(); voltage_regulator_device &vref(VOLTAGE_REGULATOR(config, "vref", 0)); vref.add_route(0, m_dac, 1.0, DAC_VREF_POS_INPUT); vref.add_route(0, m_dac, -1.0, DAC_VREF_NEG_INPUT); DAC_6BIT_R2R(config, m_dac, 0).add_route(0, "avr8", 0.25); // pd1/pd2/pd4/pd5/pd6/pd7 + 2k(x7) + 1k(x5) } ROM_START( craft ) ROM_REGION( 0x2000, "maincpu", 0 ) ROM_LOAD( "craft.bin", 0x0000, 0x2000, CRC(2e6f9ad2) SHA1(75e495bf18395d74289ca7ee2649622fc4010457) ) ROM_REGION( 0x200, "eeprom", 0 ) ROM_LOAD( "eeprom.raw", 0x0000, 0x0200, CRC(e18a2af9) SHA1(81fc6f2d391edfd3244870214fac37929af0ac0c) ) ROM_END /* YEAR NAME PARENT COMPAT MACHINE INPUT CLASS INIT COMPANY FULLNAME */ CONS(2008, craft, 0, 0, craft, empty_input, lft_craft_state, empty_init, u8"Linus Åkesson", "Craft", MACHINE_IMPERFECT_GRAPHICS)