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https://github.com/holub/mame
synced 2025-04-24 09:20:02 +03:00
k28: simplify display handling (nw)
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hap
parent
da3c5ca875
commit
725fa0f772
@ -72,7 +72,7 @@ public:
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m_led(*this, "led%u", 0U)
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{ }
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// machine drivers
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// machine configs
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void intel02(machine_config &config);
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// assume that reset button is tied to RESET pin
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@ -196,7 +196,7 @@ WRITE8_MEMBER(intel02_state::control_w)
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if (BIT(data, i))
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m_led_active |= 1 << i;
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// on falling edge, delay it going off to prevent flicker
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// they're strobed, so on falling edge, delay them going off to prevent flicker
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else if (BIT(m_led_select, i))
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m_led_delay[i]->adjust(attotime::from_msec(10), i);
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}
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@ -261,7 +261,7 @@ INPUT_PORTS_END
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/******************************************************************************
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Machine Drivers
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Machine Configs
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******************************************************************************/
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void intel02_state::intel02(machine_config &config)
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@ -278,7 +278,7 @@ void intel02_state::intel02(machine_config &config)
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m_ppi8255->tri_pb_callback().set_constant(0);
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m_ppi8255->out_pc_callback().set(FUNC(intel02_state::control_w));
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/* display hardware */
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/* video hardware */
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for (int i = 0; i < 6; i++)
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TIMER(config, m_led_delay[i]).configure_generic(FUNC(intel02_state::led_delay_off));
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@ -29,6 +29,7 @@
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#include "k28.lh"
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namespace {
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class k28_state : public driver_device
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{
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@ -39,57 +40,40 @@ public:
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m_tms6100(*this, "tms6100"),
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m_speech(*this, "speech"),
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m_vfd(*this, "vfd"),
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m_digit_delay(*this, "led_delay_%u", 0),
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m_onbutton_timer(*this, "on_button"),
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m_inp_matrix(*this, "IN.%u", 0),
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m_out_x(*this, "%u.%u", 0U, 0U),
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m_out_a(*this, "%u.a", 0U),
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m_out_digit(*this, "digit%u", 0U),
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m_display_wait(33),
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m_display_maxy(1),
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m_display_maxx(0)
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m_out_digit(*this, "digit%u", 0U)
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{ }
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void k28(machine_config &config);
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DECLARE_INPUT_CHANGED_MEMBER(power_on);
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protected:
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virtual void machine_start() override;
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virtual void machine_reset() override;
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private:
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// devices
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required_device<i8021_device> m_maincpu;
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required_device<tms6100_device> m_tms6100;
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required_device<votrax_sc01_device> m_speech;
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required_device<mm5445_device> m_vfd;
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required_device_array<timer_device, 9> m_digit_delay;
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required_device<timer_device> m_onbutton_timer;
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required_ioport_array<7> m_inp_matrix;
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output_finder<0x20, 0x20> m_out_x;
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output_finder<0x20> m_out_a;
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output_finder<0x20> m_out_digit;
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output_finder<9, 16> m_out_x;
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output_finder<9> m_out_digit;
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// display common
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int m_display_wait; // led/lamp off-delay in milliseconds (default 33ms)
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int m_display_maxy; // display matrix number of rows
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int m_display_maxx; // display matrix number of columns (max 31 for now)
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u32 m_display_state[0x20]; // display matrix rows data (last bit is used for always-on)
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u16 m_display_segmask[0x20]; // if not 0, display matrix row is a digit, mask indicates connected segments
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u8 m_display_decay[0x20][0x20]; // (internal use)
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TIMER_DEVICE_CALLBACK_MEMBER(display_decay_tick);
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void display_update();
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void set_display_size(int maxx, int maxy);
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void set_display_segmask(u32 digits, u32 mask);
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void display_matrix(int maxx, int maxy, u32 setx, u32 sety, bool update = true);
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TIMER_DEVICE_CALLBACK_MEMBER(digit_delay_off);
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bool m_power_on;
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u8 m_inp_mux;
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u8 m_phoneme;
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int m_speech_strobe;
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int m_vfd_data_enable;
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int m_vfd_data_in;
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int m_vfd_clock;
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u64 m_vfd_shiftreg;
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u64 m_vfd_shiftreg_out;
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int m_vfd_shiftcount;
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u64 m_vfd_data;
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DECLARE_WRITE64_MEMBER(vfd_output_w);
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DECLARE_WRITE8_MEMBER(mcu_p0_w);
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@ -98,9 +82,6 @@ private:
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DECLARE_WRITE8_MEMBER(mcu_p2_w);
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void power_off();
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virtual void machine_start() override;
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virtual void machine_reset() override;
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};
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@ -110,44 +91,21 @@ void k28_state::machine_start()
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{
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// resolve handlers
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m_out_x.resolve();
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m_out_a.resolve();
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m_out_digit.resolve();
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// zerofill
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memset(m_display_state, 0, sizeof(m_display_state));
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memset(m_display_decay, 0, sizeof(m_display_decay));
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memset(m_display_segmask, 0, sizeof(m_display_segmask));
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m_power_on = false;
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m_inp_mux = 0;
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m_phoneme = 0x3f;
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m_speech_strobe = 0;
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m_vfd_data_enable = 0;
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m_vfd_data_in = 0;
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m_vfd_clock = 0;
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m_vfd_shiftreg = 0;
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m_vfd_shiftreg_out = 0;
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m_vfd_shiftcount = 0;
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m_vfd_data = 0;
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// register for savestates
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save_item(NAME(m_display_maxy));
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save_item(NAME(m_display_maxx));
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save_item(NAME(m_display_wait));
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save_item(NAME(m_display_state));
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save_item(NAME(m_display_decay));
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save_item(NAME(m_display_segmask));
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save_item(NAME(m_power_on));
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save_item(NAME(m_inp_mux));
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save_item(NAME(m_phoneme));
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save_item(NAME(m_speech_strobe));
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save_item(NAME(m_vfd_data_enable));
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save_item(NAME(m_vfd_data_in));
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save_item(NAME(m_vfd_clock));
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save_item(NAME(m_vfd_shiftreg));
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save_item(NAME(m_vfd_shiftreg_out));
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save_item(NAME(m_vfd_shiftcount));
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save_item(NAME(m_vfd_data));
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}
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void k28_state::machine_reset()
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@ -172,108 +130,56 @@ void k28_state::power_off()
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}
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/***************************************************************************
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Helper Functions
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/******************************************************************************
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Devices, I/O
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******************************************************************************/
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***************************************************************************/
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// VFD handling
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// The device may strobe the outputs very fast, it is unnoticeable to the user.
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// To prevent flickering here, we need to simulate a decay.
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void k28_state::display_update()
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TIMER_DEVICE_CALLBACK_MEMBER(k28_state::digit_delay_off)
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{
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for (int y = 0; y < m_display_maxy; y++)
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// clear vfd outputs
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if (!BIT(m_vfd_data, param+16))
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{
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u32 active_state = 0;
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m_out_digit[param] = 0;
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for (int x = 0; x <= m_display_maxx; x++)
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{
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// turn on powered segments
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if (m_power_on && m_display_state[y] >> x & 1)
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m_display_decay[y][x] = m_display_wait;
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// determine active state
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u32 ds = (m_display_decay[y][x] != 0) ? 1 : 0;
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active_state |= (ds << x);
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// output to y.x, or y.a when always-on
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if (x != m_display_maxx)
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m_out_x[y][x] = ds;
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else
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m_out_a[y] = ds;
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}
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// output to digity
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if (m_display_segmask[y] != 0)
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m_out_digit[y] = active_state & m_display_segmask[y];
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for (int i = 0; i < 16; i++)
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m_out_x[param][i] = 0;
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}
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}
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TIMER_DEVICE_CALLBACK_MEMBER(k28_state::display_decay_tick)
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{
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// slowly turn off unpowered segments
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for (int y = 0; y < m_display_maxy; y++)
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for (int x = 0; x <= m_display_maxx; x++)
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if (m_display_decay[y][x] != 0)
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m_display_decay[y][x]--;
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display_update();
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}
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void k28_state::set_display_size(int maxx, int maxy)
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{
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m_display_maxx = maxx;
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m_display_maxy = maxy;
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}
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void k28_state::set_display_segmask(u32 digits, u32 mask)
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{
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// set a segment mask per selected digit, but leave unselected ones alone
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for (int i = 0; i < 0x20; i++)
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{
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if (digits & 1)
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m_display_segmask[i] = mask;
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digits >>= 1;
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}
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}
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void k28_state::display_matrix(int maxx, int maxy, u32 setx, u32 sety, bool update)
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{
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set_display_size(maxx, maxy);
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// update current state
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u32 mask = (1 << maxx) - 1;
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for (int y = 0; y < maxy; y++)
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m_display_state[y] = (sety >> y & 1) ? ((setx & mask) | (1 << maxx)) : 0;
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display_update();
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}
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/***************************************************************************
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I/O
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***************************************************************************/
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WRITE64_MEMBER(k28_state::vfd_output_w)
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{
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// O1-O16: digit segment data
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// O17-O25: digit select
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u16 seg_data = bitswap<16>(data,15,14,2,6,5,3,1,7,12,11,10,13,0,4,9,8);
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u16 digit_sel = data >> 16 & 0x1ff;
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set_display_segmask(0x1ff, 0x3fff);
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display_matrix(16, 9, seg_data, digit_sel);
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// O17-O25: digit select
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for (int i = 0; i < 9; i++)
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{
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if (BIT(data, i+16))
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{
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m_out_digit[i] = seg_data & 0x3fff;
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// output individual segments (2 of them are not in MAME's 16seg)
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for (int j = 0; j < 16; j++)
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m_out_x[i][j] = seg_data >> j & 1;
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}
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// they're strobed, so on falling edge, delay them going off to prevent flicker
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else if (BIT(m_vfd_data, i+16))
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m_digit_delay[i]->adjust(attotime::from_msec(50), i);
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}
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// O26: power-off request on falling edge
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if (~data & m_vfd_shiftreg_out & 0x2000000)
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if (~data & m_vfd_data & 0x2000000)
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power_off();
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m_vfd_shiftreg_out = data;
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m_vfd_data = data;
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}
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// I8021 ports
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WRITE8_MEMBER(k28_state::mcu_p0_w)
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{
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// d0,d1: phoneme high bits
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@ -337,11 +243,9 @@ WRITE8_MEMBER(k28_state::mcu_p2_w)
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/***************************************************************************
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Inputs
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***************************************************************************/
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/******************************************************************************
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Input Ports
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******************************************************************************/
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static INPUT_PORTS_START( k28 )
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PORT_START("IN.0")
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@ -417,11 +321,9 @@ INPUT_PORTS_END
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/***************************************************************************
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Machine Config
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***************************************************************************/
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/******************************************************************************
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Machine Configs
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******************************************************************************/
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void k28_state::k28(machine_config &config)
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{
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@ -442,7 +344,8 @@ void k28_state::k28(machine_config &config)
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MM5445(config, m_vfd).output_cb().set(FUNC(k28_state::vfd_output_w));
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config.set_default_layout(layout_k28);
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TIMER(config, "display_decay").configure_periodic(FUNC(k28_state::display_decay_tick), attotime::from_msec(1));
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for (int i = 0; i < 9; i++)
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TIMER(config, m_digit_delay[i]).configure_generic(FUNC(k28_state::digit_delay_off));
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/* sound hardware */
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SPEAKER(config, "mono").front_center();
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@ -451,11 +354,9 @@ void k28_state::k28(machine_config &config)
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/***************************************************************************
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ROM Defs, Game driver(s)
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***************************************************************************/
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/******************************************************************************
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ROM Definitions
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******************************************************************************/
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ROM_START( k28 )
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ROM_REGION( 0x1000, "maincpu", 0 )
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@ -466,7 +367,13 @@ ROM_START( k28 )
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ROM_LOAD( "cm62051.vsm", 0x4000, 0x4000, CRC(0fa61baa) SHA1(831be669423ba60c7f85a896b4b09a1295478bd9) )
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ROM_END
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} // anonymous namespace
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/******************************************************************************
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Drivers
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******************************************************************************/
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// YEAR NAME PARENT CMP MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS
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COMP( 1981, k28, 0, 0, k28, k28, k28_state, empty_init, "Tiger Electronics", "K28: Talking Learning Computer (model 7-230)", MACHINE_SUPPORTS_SAVE )
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