// 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<avr8_device> m_maincpu;
required_device<dac_byte_interface> m_dac;
required_device<screen_device> m_screen;
required_device<palette_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<uint8_t[]> 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<uint8_t[]>(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)