Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-05-29 17:13:05 +03:00
Code Issues Actions Packages Projects Releases Wiki Activity

(MESS) rainbow: added IRQ management framework and vector control. [R. Belmont, Bavarese]

Browse Source
This commit is contained in:
R. Belmont 2014-02-23 02:21:49 +00:00
parent 6e5679d873
commit 9490ca46a2
1 changed files with 69 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
src/mess/drivers/rainbow.c
View File

@ -248,6 +248,8 @@ public:
DECLARE_WRITE_LINE_MEMBER(kbd_rxready_w);
DECLARE_WRITE_LINE_MEMBER(kbd_txready_w);
DECLARE_WRITE_LINE_MEMBER(irq_hi_w);
UINT32 screen_update_rainbow(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
INTERRUPT_GEN_MEMBER(vblank_irq);
DECLARE_WRITE_LINE_MEMBER(write_keyboard_clock);
@ -257,6 +259,15 @@ protected:
virtual void machine_start();
private:
enum
{
IRQ_8088_MAILBOX = 0, // vector 0x27/a7
IRQ_8088_VBL, // vector 0x20/a0
IRQ_8088_KBD, // vector 0x26/a6
IRQ_8088_MAX
};
required_ioport m_inp1;
required_ioport m_inp2;
required_ioport m_inp3;
@ -279,6 +290,10 @@ private:
required_shared_ptr<UINT8> m_shared;
required_device<cpu_device> m_maincpu;
void raise_8088_irq(int ref);
void lower_8088_irq(int ref);
void update_8088_irqs();
bool m_SCREEN_BLANK;
int INT88, INTZ80;
@ -304,6 +319,9 @@ private:
int m_unit;
device_t *m_image[4];
int m_irq_high;
UINT32 m_irq_mask;
};
@ -324,6 +342,8 @@ void rainbow_state::machine_start()
save_item(NAME(m_zflip));
save_item(NAME(m_kbd_tx_ready));
save_item(NAME(m_kbd_rx_ready));
save_item(NAME(m_irq_high));
save_item(NAME(m_irq_mask));
#ifdef FORCE_RAINBOW_100_LOGO
UINT8 *rom = memregion("maincpu")->base();
@ -531,6 +551,7 @@ void rainbow_state::machine_reset()
m_kbd8251->write_cts(1);
m_KBD = 0;
m_irq_high = 0;
// RESET ALL LEDs
output_set_value("led1", 1);
@ -549,7 +570,7 @@ void rainbow_state::machine_reset()
MOTOR_DISABLE_counter = 2; // soon resets drv.LEDs
m_unit = 0;
m_irq_mask = 0;
}
UINT32 rainbow_state::screen_update_rainbow(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
@ -600,6 +621,39 @@ WRITE8_MEMBER(rainbow_state::floating_bus_w)
space.write_byte(offset,data);
}
// interrupt handling and arbitration. priorities currently unknown.
void rainbow_state::update_8088_irqs()
{
static const int vectors[] = { 0x27, 0x20, 0x26 };
if (m_irq_mask != 0)
{
for (int i = 0; i < IRQ_8088_MAX; i++)
{
if (m_irq_mask & (1<<i))
{
m_i8088->set_input_line_and_vector(INPUT_LINE_INT0, ASSERT_LINE, vectors[i] | m_irq_high);
break;
}
}
}
else
{
m_i8088->set_input_line(INPUT_LINE_INT0, CLEAR_LINE);
}
}
void rainbow_state::raise_8088_irq(int ref)
{
m_irq_mask |= (1<<ref);
update_8088_irqs();
}
void rainbow_state::lower_8088_irq(int ref)
{
m_irq_mask &= ~(1<<ref);
update_8088_irqs();
}
READ8_MEMBER(rainbow_state::share_z80_r)
{
@ -728,7 +782,7 @@ WRITE8_MEMBER(rainbow_state::comm_control_w)
READ8_MEMBER(rainbow_state::i8088_latch_r)
{
// printf("Read %02x from 8088 mailbox\n", m_8088_mailbox);
m_i8088->set_input_line(INPUT_LINE_INT0, CLEAR_LINE);
lower_8088_irq(IRQ_8088_MAILBOX);
INT88 = false; // BISLANG: INTZ80 = false; //
return m_8088_mailbox;
@ -760,7 +814,7 @@ READ8_MEMBER(rainbow_state::z80_latch_r)
WRITE8_MEMBER(rainbow_state::z80_latch_w)
{
// printf("%02x to 8088 mailbox\n", data);
m_i8088->set_input_line_and_vector(INPUT_LINE_INT0, ASSERT_LINE, 0x27);
raise_8088_irq(IRQ_8088_MAILBOX);
m_8088_mailbox = data;
INT88 = true;
@ -938,12 +992,12 @@ READ8_MEMBER( rainbow_state::read_video_ram_r )
INTERRUPT_GEN_MEMBER(rainbow_state::vblank_irq)
{
device.execute().set_input_line_and_vector(INPUT_LINE_INT0, ASSERT_LINE, 0x20);
raise_8088_irq(IRQ_8088_VBL);
}
WRITE8_MEMBER( rainbow_state::clear_video_interrupt )
{
m_i8088->set_input_line(INPUT_LINE_INT0, CLEAR_LINE);
lower_8088_irq(IRQ_8088_VBL);
}
READ8_MEMBER( rainbow_state::diagnostic_r )
@ -1007,11 +1061,11 @@ void rainbow_state::update_kbd_irq()
{
if ((m_kbd_rx_ready) || (m_kbd_tx_ready))
{
m_i8088->set_input_line_and_vector(INPUT_LINE_INT0, ASSERT_LINE, 0x26);
raise_8088_irq(IRQ_8088_KBD);
}
else
{
m_i8088->set_input_line(INPUT_LINE_INT0, CLEAR_LINE);
lower_8088_irq(IRQ_8088_KBD);
}
}
@ -1036,7 +1090,7 @@ WRITE_LINE_MEMBER(rainbow_state::kbd_txready_w)
update_kbd_irq();
}
DECLARE_WRITE_LINE_MEMBER(rainbow_state::write_keyboard_clock)
WRITE_LINE_MEMBER(rainbow_state::write_keyboard_clock)
{
m_kbd8251->write_txc(state);
m_kbd8251->write_rxc(state);
@ -1068,6 +1122,12 @@ TIMER_DEVICE_CALLBACK_MEMBER(rainbow_state::motor_tick)
m_beep_counter--;
}
// on 100-B, DTR from the keyboard 8051 controls bit 7 of IRQ vectors
WRITE_LINE_MEMBER(rainbow_state::irq_hi_w)
{
m_irq_high = (state == ASSERT_LINE) ? 0x80 : 0;
}
static const vt_video_interface video_interface =
{
"chargen",
@ -1146,6 +1206,7 @@ static MACHINE_CONFIG_START( rainbow, rainbow_state )
MCFG_DEVICE_ADD("kbdser", I8251, 0)
MCFG_I8251_TXD_HANDLER(WRITELINE(rainbow_state, kbd_tx))
MCFG_I8251_DTR_HANDLER(WRITELINE(rainbow_state, irq_hi_w))
MCFG_I8251_RXRDY_HANDLER(WRITELINE(rainbow_state, kbd_rxready_w))
MCFG_I8251_TXRDY_HANDLER(WRITELINE(rainbow_state, kbd_txready_w))