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Refactored I8255 into a C++ device. (no whatsnew)

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This commit is contained in:
Curt Coder 2011-04-26 14:10:10 +00:00
parent a1d618b9da
commit 9b06486135
6 changed files with 1235 additions and 996 deletions
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4
.gitattributes vendored
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@ -799,8 +799,8 @@ src/emu/machine/i8214.c svneol=native#text/plain
src/emu/machine/i8214.h svneol=native#text/plain
src/emu/machine/i8243.c svneol=native#text/plain
src/emu/machine/i8243.h svneol=native#text/plain
src/emu/machine/i8255a.c svneol=native#text/plain
src/emu/machine/i8255a.h svneol=native#text/plain
src/emu/machine/i8255.c svneol=native#text/plain
src/emu/machine/i8255.h svneol=native#text/plain
src/emu/machine/i8355.c svneol=native#text/plain
src/emu/machine/i8355.h svneol=native#text/plain
src/emu/machine/idectrl.c svneol=native#text/plain

2
src/emu/emu.mak
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@ -175,7 +175,7 @@ EMUMACHINEOBJS = \
$(EMUMACHINE)/i8212.o \
$(EMUMACHINE)/i8214.o \
$(EMUMACHINE)/i8243.o \
$(EMUMACHINE)/i8255a.o \
$(EMUMACHINE)/i8255.o \
$(EMUMACHINE)/i8355.o \
$(EMUMACHINE)/idectrl.o \
$(EMUMACHINE)/ins8154.o \

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src/emu/machine/i8255.c Normal file
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src/emu/machine/i8255.h Normal file
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@ -0,0 +1,179 @@
/**********************************************************************
Intel 8255(A) Programmable Peripheral Interface emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
PA3 1 |* \_/ | 40 PA4
PA2 2 | | 39 PA5
PA1 3 | | 38 PA6
PA0 4 | | 37 PA7
_RD 5 | | 36 WR
_CS 6 | | 35 RESET
GND 7 | | 34 D0
A1 8 | | 33 D1
A0 9 | | 32 D2
PC7 10 | 8255 | 31 D3
PC6 11 | 8255A | 30 D4
PC5 12 | | 29 D5
PC4 13 | | 28 D6
PC0 14 | | 27 D7
PC1 15 | | 26 Vcc
PC2 16 | | 25 PB7
PC3 17 | | 24 PB6
PB0 18 | | 23 PB5
PB1 19 | | 22 PB4
PB2 20 |_____________| 21 PB3
**********************************************************************/
#pragma once
#ifndef __I8255__
#define __I8255__
#include "emu.h"
//**************************************************************************
// INTERFACE CONFIGURATION MACROS
//**************************************************************************
#define MCFG_I8255_ADD(_tag, _intrf) \
MCFG_DEVICE_ADD(_tag, I8255, 0) \
MCFG_DEVICE_CONFIG(_intrf)
#define MCFG_I8255A_ADD(_tag, _intrf) \
MCFG_DEVICE_ADD(_tag, I8255A, 0) \
MCFG_DEVICE_CONFIG(_intrf)
#define I8255_INTERFACE(name) \
const i8255_interface (name) =
#define I8255A_INTERFACE(name) \
const i8255_interface (name) =
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
// ======================> i8255_interface
struct i8255_interface
{
devcb_read8 m_in_pa_func;
devcb_write8 m_out_pa_func;
devcb_read8 m_in_pb_func;
devcb_write8 m_out_pb_func;
devcb_read8 m_in_pc_func;
devcb_write8 m_out_pc_func;
};
// ======================> i8255_device_config
class i8255_device_config : public device_config,
public i8255_interface
{
friend class i8255_device;
// construction/destruction
i8255_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
public:
// allocators
static device_config *static_alloc_device_config(const machine_config &mconfig, const char *tag, const device_config *owner, UINT32 clock);
virtual device_t *alloc_device(running_machine &machine) const;
protected:
// device_config overrides
virtual void device_config_complete();
};
// ======================> i8255_device
class i8255_device : public device_t
{
friend class i8255_device_config;
// construction/destruction
i8255_device(running_machine &_machine, const i8255_device_config &_config);
public:
DECLARE_READ8_MEMBER( read );
DECLARE_WRITE8_MEMBER( write );
DECLARE_READ8_MEMBER( pa_r );
UINT8 pa_r();
DECLARE_READ8_MEMBER( pb_r );
UINT8 pb_r();
DECLARE_WRITE_LINE_MEMBER( pc2_w );
DECLARE_WRITE_LINE_MEMBER( pc4_w );
DECLARE_WRITE_LINE_MEMBER( pc6_w );
protected:
// device-level overrides
virtual void device_start();
virtual void device_reset();
private:
inline void check_interrupt(int port);
inline void set_ibf(int port, int state);
inline void set_obf(int port, int state);
inline void set_inte(int port, int state);
inline void set_inte1(int state);
inline void set_inte2(int state);
inline void set_intr(int port, int state);
inline int group_mode(int group);
inline int port_mode(int port);
inline int port_c_lower_mode();
inline int port_c_upper_mode();
UINT8 read_mode0(int port);
UINT8 read_mode1(int port);
UINT8 read_mode2();
UINT8 read_pc();
void write_mode0(int port, UINT8 data);
void write_mode1(int port, UINT8 data);
void write_mode2(UINT8 data);
void write_pc(UINT8 data);
void output_pc();
void set_mode(UINT8 data);
void set_pc_bit(int bit, int state);
devcb_resolved_read8 m_in_port_func[3];
devcb_resolved_write8 m_out_port_func[3];
UINT8 m_control; // mode control word
UINT8 m_output[3]; // output latch
UINT8 m_input[3]; // input latch
int m_ibf[2]; // input buffer full flag
int m_obf[2]; // output buffer full flag, negative logic
int m_inte[2]; // interrupt enable
int m_inte1; // interrupt enable
int m_inte2; // interrupt enable
int m_intr[2]; // interrupt
const i8255_device_config &m_config;
};
// device type definition
extern const device_type I8255;
extern const device_type I8255A;
#endif

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src/emu/machine/i8255a.c
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@ -1,909 +0,0 @@
/**********************************************************************
Intel 8255A Programmable Peripheral Interface emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************/
#include "emu.h"
#include "i8255a.h"
/***************************************************************************
PARAMETERS
***************************************************************************/
#define LOG 0
enum
{
PORT_A = 0,
PORT_B,
PORT_C,
CONTROL
};
enum
{
GROUP_A = 0,
GROUP_B
};
enum
{
MODE_0 = 0,
MODE_1,
MODE_2
};
enum
{
MODE_OUTPUT = 0,
MODE_INPUT,
};
#define I8255A_CONTROL_PORT_C_LOWER_INPUT 0x01
#define I8255A_CONTROL_PORT_B_INPUT 0x02
#define I8255A_CONTROL_GROUP_B_MODE_1 0x04
#define I8255A_CONTROL_PORT_C_UPPER_INPUT 0x08
#define I8255A_CONTROL_PORT_A_INPUT 0x10
#define I8255A_CONTROL_GROUP_A_MODE_MASK 0x60
#define I8255A_CONTROL_MODE_SET 0x80
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
typedef struct _i8255a_t i8255a_t;
struct _i8255a_t
{
devcb_resolved_read8 in_port_func[3];
devcb_resolved_write8 out_port_func[3];
UINT8 control; /* mode control word */
UINT8 output[3]; /* output latch */
UINT8 input[3]; /* input latch */
int ibf[2]; /* input buffer full flag */
int obf[2]; /* output buffer full flag, negative logic */
int inte[2]; /* interrupt enable */
int inte1; /* interrupt enable */
int inte2; /* interrupt enable */
int intr[2]; /* interrupt */
};
/***************************************************************************
INLINE FUNCTIONS
***************************************************************************/
INLINE i8255a_t *get_safe_token(device_t *device)
{
assert(device != NULL);
return (i8255a_t *)downcast<legacy_device_base *>(device)->token();
}
INLINE const i8255a_interface *get_interface(device_t *device)
{
assert(device != NULL);
assert((device->type() == I8255A));
return (const i8255a_interface *) device->baseconfig().static_config();
}
INLINE int group_mode(i8255a_t *i8255a, int group)
{
int mode = 0;
switch (group)
{
case GROUP_A:
switch ((i8255a->control & I8255A_CONTROL_GROUP_A_MODE_MASK) >> 5)
{
case 0: mode = MODE_0; break;
case 1: mode = MODE_1; break;
case 2: case 3: mode = MODE_2; break;
}
break;
case GROUP_B:
mode = i8255a->control & I8255A_CONTROL_GROUP_B_MODE_1 ? MODE_1 : MODE_0;
break;
}
return mode;
}
INLINE int port_mode(i8255a_t *i8255a, int port)
{
int mode = 0;
switch (port)
{
case PORT_A: mode = i8255a->control & I8255A_CONTROL_PORT_A_INPUT ? MODE_INPUT : MODE_OUTPUT; break;
case PORT_B: mode = i8255a->control & I8255A_CONTROL_PORT_B_INPUT ? MODE_INPUT : MODE_OUTPUT; break;
}
return mode;
}
INLINE int port_c_lower_mode(i8255a_t *i8255a)
{
return i8255a->control & I8255A_CONTROL_PORT_C_LOWER_INPUT ? MODE_INPUT : MODE_OUTPUT;
}
INLINE int port_c_upper_mode(i8255a_t *i8255a)
{
return i8255a->control & I8255A_CONTROL_PORT_C_UPPER_INPUT ? MODE_INPUT : MODE_OUTPUT;
}
/***************************************************************************
IMPLEMENTATION
***************************************************************************/
static void output_pc(i8255a_t *i8255a)
{
UINT8 data = 0;
UINT8 mask = 0;
/* PC upper */
switch (group_mode(i8255a, GROUP_A))
{
case MODE_0:
if (port_c_upper_mode(i8255a) == MODE_OUTPUT)
{
mask |= 0xf0;
}
else
{
/* TTL inputs float high */
data |= 0xf0;
}
break;
case MODE_1:
data |= i8255a->intr[PORT_A] ? 0x08 : 0x00;
if (port_mode(i8255a, PORT_A) == MODE_OUTPUT)
{
data |= i8255a->obf[PORT_A] ? 0x80 : 0x00;
mask |= 0x30;
}
else
{
data |= i8255a->ibf[PORT_A] ? 0x20 : 0x00;
mask |= 0xc0;
}
break;
case MODE_2:
data |= i8255a->intr[PORT_A] ? 0x08 : 0x00;
data |= i8255a->ibf[PORT_A] ? 0x20 : 0x00;
data |= i8255a->obf[PORT_A] ? 0x80 : 0x00;
break;
}
/* PC lower */
switch (group_mode(i8255a, GROUP_B))
{
case MODE_0:
if (port_c_lower_mode(i8255a) == MODE_OUTPUT)
{
mask |= 0x0f;
}
else
{
/* TTL inputs float high */
data |= 0x0f;
}
break;
case MODE_1:
data |= i8255a->intr[PORT_B] ? 0x01 : 0x00;
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
{
data |= i8255a->obf[PORT_B] ? 0x02 : 0x00;
}
else
{
data |= i8255a->ibf[PORT_B] ? 0x02 : 0x00;
}
}
data |= i8255a->output[PORT_C] & mask;
devcb_call_write8(&i8255a->out_port_func[PORT_C], 0, data);
}
static void check_interrupt(i8255a_t *i8255a, int port)
{
switch (group_mode(i8255a, port))
{
case MODE_1:
switch (port_mode(i8255a, port))
{
case MODE_INPUT:
if (i8255a->inte[port] && i8255a->ibf[port])
{
if (LOG) logerror("8255A Port %c INTR: 1\n", 'A' + port);
i8255a->intr[port] = 1;
}
break;
case MODE_OUTPUT:
if (i8255a->inte[port] && i8255a->obf[port])
{
if (LOG) logerror("8255A Port %c INTR: 1\n", 'A' + port);
i8255a->intr[port] = 1;
}
break;
}
break;
case MODE_2:
if ((i8255a->inte1 && i8255a->obf[port]) || (i8255a->inte2 && i8255a->ibf[port]))
{
if (LOG) logerror("8255A Port %c INTR: 1\n", 'A' + port);
i8255a->intr[port] = 1;
}
break;
}
output_pc(i8255a);
}
static void set_ibf(i8255a_t *i8255a, int port, int state)
{
if (LOG) logerror("8255A Port %c IBF: %u\n", 'A' + port, state);
i8255a->ibf[port] = state;
check_interrupt(i8255a, port);
}
static void set_obf(i8255a_t *i8255a, int port, int state)
{
if (LOG) logerror("8255A Port %c OBF: %u\n", 'A' + port, state);
i8255a->obf[port] = state;
check_interrupt(i8255a, port);
}
static void set_inte(i8255a_t *i8255a, int port, int state)
{
if (LOG) logerror("8255A Port %c INTE: %u\n", 'A' + port, state);
i8255a->inte[port] = state;
check_interrupt(i8255a, port);
}
static void set_inte1(i8255a_t *i8255a, int state)
{
if (LOG) logerror("8255A Port A INTE1: %u\n", state);
i8255a->inte1 = state;
check_interrupt(i8255a, PORT_A);
}
static void set_inte2(i8255a_t *i8255a, int state)
{
if (LOG) logerror("8255A Port A INTE2: %u\n", state);
i8255a->inte2 = state;
check_interrupt(i8255a, PORT_A);
}
static void set_intr(i8255a_t *i8255a, int port, int state)
{
if (LOG) logerror("8255A Port %c INTR: %u\n", 'A' + port, state);
i8255a->intr[port] = state;
output_pc(i8255a);
}
static UINT8 read_mode0(i8255a_t *i8255a, int port)
{
UINT8 data = 0;
if (port_mode(i8255a, port) == MODE_OUTPUT)
{
/* read data from output latch */
data = i8255a->output[port];
}
else
{
/* read data from port */
data = devcb_call_read8(&i8255a->in_port_func[port], 0);
}
return data;
}
static UINT8 read_mode1(i8255a_t *i8255a, int port)
{
UINT8 data = 0;
if (port_mode(i8255a, port) == MODE_OUTPUT)
{
/* read data from output latch */
data = i8255a->output[port];
}
else
{
/* read data from input latch */
data = i8255a->input[port];
/* clear input buffer full flag */
set_ibf(i8255a, port, 0);
/* clear interrupt */
set_intr(i8255a, port, 0);
/* clear input latch */
i8255a->input[port] = 0;
}
return data;
}
static UINT8 read_mode2(i8255a_t *i8255a)
{
UINT8 data = 0;
/* read data from input latch */
data = i8255a->input[PORT_A];
/* clear input buffer full flag */
set_ibf(i8255a, PORT_A, 0);
/* clear interrupt */
set_intr(i8255a, PORT_A, 0);
/* clear input latch */
i8255a->input[PORT_A] = 0;
return data;
}
static UINT8 read_pc(i8255a_t *i8255a)
{
UINT8 data = 0;
UINT8 mask = 0;
/* PC upper */
switch (group_mode(i8255a, GROUP_A))
{
case MODE_0:
if (port_c_upper_mode(i8255a) == MODE_OUTPUT)
{
/* read data from output latch */
data |= i8255a->output[PORT_C] & 0xf0;
}
else
{
/* read data from port */
mask |= 0xf0;
}
break;
case MODE_1:
data |= i8255a->intr[PORT_A] ? 0x08 : 0x00;
if (port_mode(i8255a, PORT_A) == MODE_OUTPUT)
{
data |= i8255a->obf[PORT_A] ? 0x80 : 0x00;
data |= i8255a->inte[PORT_A] ? 0x40 : 0x00;
mask |= 0x30;
}
else
{
data |= i8255a->ibf[PORT_A] ? 0x20 : 0x00;
data |= i8255a->inte[PORT_A] ? 0x10 : 0x00;
mask |= 0xc0;
}
break;
case MODE_2:
data |= i8255a->intr[PORT_A] ? 0x08 : 0x00;
data |= i8255a->inte2 ? 0x10 : 0x00;
data |= i8255a->ibf[PORT_A] ? 0x20 : 0x00;
data |= i8255a->inte1 ? 0x40 : 0x00;
data |= i8255a->obf[PORT_A] ? 0x80 : 0x00;
break;
}
/* PC lower */
switch (group_mode(i8255a, GROUP_B))
{
case MODE_0:
if (port_c_lower_mode(i8255a) == MODE_OUTPUT)
{
/* read data from output latch */
data |= i8255a->output[PORT_C] & 0x0f;
}
else
{
/* read data from port */
mask |= 0x0f;
}
break;
case MODE_1:
data |= i8255a->inte[PORT_B] ? 0x04 : 0x00;
data |= i8255a->intr[PORT_B] ? 0x01 : 0x00;
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
{
data |= i8255a->obf[PORT_B] ? 0x02 : 0x00;
}
else
{
data |= i8255a->ibf[PORT_B] ? 0x02 : 0x00;
}
}
if (mask)
{
/* read data from port */
data |= devcb_call_read8(&i8255a->in_port_func[PORT_C], 0) & mask;
}
return data;
}
READ8_DEVICE_HANDLER( i8255a_r )
{
i8255a_t *i8255a = get_safe_token(device);
UINT8 data = 0;
switch (offset & 0x03)
{
case PORT_A:
switch (group_mode(i8255a, GROUP_A))
{
case MODE_0: data = read_mode0(i8255a, PORT_A); break;
case MODE_1: data = read_mode1(i8255a, PORT_A); break;
case MODE_2: data = read_mode2(i8255a); break;
}
if (LOG) logerror("8255A '%s' Port A Read: %02x\n", device->tag(), data);
break;
case PORT_B:
switch (group_mode(i8255a, GROUP_B))
{
case MODE_0: data = read_mode0(i8255a, PORT_B); break;
case MODE_1: data = read_mode1(i8255a, PORT_B); break;
}
if (LOG) logerror("8255A '%s' Port B Read: %02x\n", device->tag(), data);
break;
case PORT_C:
data = read_pc(i8255a);
//if (LOG) logerror("8255A '%s' Port C Read: %02x\n", device->tag(), data);
break;
case CONTROL:
data = i8255a->control;
if (LOG) logerror("8255A '%s' Mode Control Word Read: %02x\n", device->tag(), data);
break;
}
return data;
}
static void write_mode0(i8255a_t *i8255a, int port, UINT8 data)
{
if (port_mode(i8255a, port) == MODE_OUTPUT)
{
/* latch output data */
i8255a->output[port] = data;
/* write data to port */
devcb_call_write8(&i8255a->out_port_func[port], 0, data);
}
}
static void write_mode1(i8255a_t *i8255a, int port, UINT8 data)
{
if (port_mode(i8255a, port) == MODE_OUTPUT)
{
/* latch output data */
i8255a->output[port] = data;
/* write data to port */
devcb_call_write8(&i8255a->out_port_func[port], 0, data);
/* set output buffer full flag */
set_obf(i8255a, port, 0);
/* clear interrupt */
set_intr(i8255a, port, 0);
}
}
static void write_mode2(i8255a_t *i8255a, UINT8 data)
{
/* latch output data */
i8255a->output[PORT_A] = data;
/* write data to port */
devcb_call_write8(&i8255a->out_port_func[PORT_A], 0, data);
/* set output buffer full flag */
set_obf(i8255a, PORT_A, 0);
/* clear interrupt */
set_intr(i8255a, PORT_A, 0);
}
static void write_pc(i8255a_t *i8255a, UINT8 data)
{
int changed = 0;
if (group_mode(i8255a, GROUP_A) == MODE_0)
{
/* PC upper */
if (port_c_upper_mode(i8255a) == MODE_OUTPUT)
{
i8255a->output[PORT_C] = (data & 0xf0) | (i8255a->output[PORT_C] & 0x0f);
changed = 1;
}
/* PC lower */
if (port_c_lower_mode(i8255a) == MODE_OUTPUT)
{
i8255a->output[PORT_C] = (i8255a->output[PORT_C] & 0xf0) | (data & 0x0f);
changed = 1;
}
}
if (changed)
{
output_pc(i8255a);
}
}
static void set_mode(device_t *device, UINT8 data)
{
i8255a_t *i8255a = get_safe_token(device);
i8255a->control = data;
/* group A */
i8255a->output[PORT_A] = 0;
i8255a->input[PORT_A] = 0;
i8255a->ibf[PORT_A] = 0;
i8255a->obf[PORT_A] = 1;
i8255a->inte[PORT_A] = 0;
i8255a->inte1 = 0;
i8255a->inte2 = 0;
if (port_mode(i8255a, PORT_A) == MODE_OUTPUT)
{
devcb_call_write8(&i8255a->out_port_func[PORT_A], 0, i8255a->output[PORT_A]);
}
else
{
/* TTL inputs float high */
devcb_call_write8(&i8255a->out_port_func[PORT_A], 0, 0xff);
}
if (LOG) logerror("8255A '%s' Group A Mode: %u\n", device->tag(), group_mode(i8255a, GROUP_A));
if (LOG) logerror("8255A '%s' Port A Mode: %s\n", device->tag(), (port_mode(i8255a, PORT_A) == MODE_OUTPUT) ? "output" : "input");
if (LOG) logerror("8255A '%s' Port C Upper Mode: %s\n", device->tag(), (port_c_upper_mode(i8255a) == MODE_OUTPUT) ? "output" : "input");
if (LOG) logerror("8255A '%s' Group B Mode: %u\n", device->tag(), group_mode(i8255a, GROUP_B));
if (LOG) logerror("8255A '%s' Port B Mode: %s\n", device->tag(), (port_mode(i8255a, PORT_B) == MODE_OUTPUT) ? "output" : "input");
if (LOG) logerror("8255A '%s' Port C Lower Mode: %s\n", device->tag(), (port_c_lower_mode(i8255a) == MODE_OUTPUT) ? "output" : "input");
/* group B */
i8255a->output[PORT_B] = 0;
i8255a->input[PORT_B] = 0;
i8255a->ibf[PORT_B] = 0;
i8255a->obf[PORT_B] = 1;
i8255a->inte[PORT_B] = 0;
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
{
devcb_call_write8(&i8255a->out_port_func[PORT_B], 0, i8255a->output[PORT_B]);
}
else
{
/* TTL inputs float high */
devcb_call_write8(&i8255a->out_port_func[PORT_B], 0, 0xff);
}
i8255a->output[PORT_C] = 0;
i8255a->input[PORT_C] = 0;
output_pc(i8255a);
}
static void set_pc_bit(device_t *device, int bit, int state)
{
i8255a_t *i8255a = get_safe_token(device);
/* set output latch bit */
i8255a->output[PORT_C] &= ~(1 << bit);
i8255a->output[PORT_C] |= state << bit;
switch (group_mode(i8255a, GROUP_A))
{
case MODE_1:
if (port_mode(i8255a, PORT_A) == MODE_OUTPUT)
{
switch (bit)
{
case 3: set_intr(i8255a, PORT_A, state); break;
case 6: set_inte(i8255a, PORT_A, state); break;
case 7: set_obf(i8255a, PORT_A, state); break;
}
}
else
{
switch (bit)
{
case 3: set_intr(i8255a, PORT_A, state); break;
case 4: set_inte(i8255a, PORT_A, state); break;
case 5: set_ibf(i8255a, PORT_A, state); break;
}
}
break;
case MODE_2:
switch (bit)
{
case 3: set_intr(i8255a, PORT_A, state); break;
case 4: set_inte2(i8255a, state); break;
case 5: set_ibf(i8255a, PORT_A, state); break;
case 6: set_inte1(i8255a, state); break;
case 7: set_obf(i8255a, PORT_A, state); break;
}
break;
}
if (group_mode(i8255a, GROUP_B) == MODE_1)
{
switch (bit)
{
case 0: set_intr(i8255a, PORT_B, state); break;
case 1:
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
set_obf(i8255a, PORT_B, state);
else
set_ibf(i8255a, PORT_B, state);
break;
case 2: set_inte(i8255a, PORT_B, state); break;
}
}
output_pc(i8255a);
}
WRITE8_DEVICE_HANDLER( i8255a_w )
{
i8255a_t *i8255a = get_safe_token(device);
switch (offset & 0x03)
{
case PORT_A:
if (LOG) logerror("8255A '%s' Port A Write: %02x\n", device->tag(), data);
switch (group_mode(i8255a, GROUP_A))
{
case MODE_0: write_mode0(i8255a, PORT_A, data); break;
case MODE_1: write_mode1(i8255a, PORT_A, data); break;
case MODE_2: write_mode2(i8255a, data); break;
}
break;
case PORT_B:
if (LOG) logerror("8255A '%s' Port B Write: %02x\n", device->tag(), data);
switch (group_mode(i8255a, GROUP_B))
{
case MODE_0: write_mode0(i8255a, PORT_B, data); break;
case MODE_1: write_mode1(i8255a, PORT_B, data); break;
}
break;
case PORT_C:
if (LOG) logerror("8255A '%s' Port C Write: %02x\n", device->tag(), data);
write_pc(i8255a, data);
break;
case CONTROL:
if (data & I8255A_CONTROL_MODE_SET)
{
if (LOG) logerror("8255A '%s' Mode Control Word: %02x\n", device->tag(), data);
set_mode(device, data);
}
else
{
int bit = (data >> 1) & 0x07;
int state = BIT(data, 0);
if (LOG) logerror("8255A '%s' %s Bit %u\n", device->tag(), state ? "Set" : "Reset", bit);
set_pc_bit(device, bit, state);
}
break;
}
}
READ8_DEVICE_HANDLER( i8255a_pa_r )
{
i8255a_t *i8255a = get_safe_token(device);
UINT8 data = 0xff;
if (port_mode(i8255a, PORT_A) == MODE_OUTPUT)
{
data = i8255a->output[PORT_A];
}
return data;
}
READ8_DEVICE_HANDLER( i8255a_pb_r )
{
i8255a_t *i8255a = get_safe_token(device);
UINT8 data = 0xff;
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
{
data = i8255a->output[PORT_B];
}
return data;
}
WRITE_LINE_DEVICE_HANDLER( i8255a_pc2_w )
{
i8255a_t *i8255a = get_safe_token(device);
if (group_mode(i8255a, GROUP_B) == 1)
{
if (port_mode(i8255a, PORT_B) == MODE_OUTPUT)
{
/* port B acknowledge */
if (!i8255a->obf[PORT_B] && !state)
{
if (LOG) logerror("8255A '%s' Port B Acknowledge\n", device->tag());
/* clear output buffer flag */
set_obf(i8255a, PORT_B, 1);
}
}
else
{
/* port B strobe */
if (!i8255a->ibf[PORT_B] && !state)
{
if (LOG) logerror("8255A '%s' Port B Strobe\n", device->tag());
/* read port into latch */
i8255a->input[PORT_B] = devcb_call_read8(&i8255a->in_port_func[PORT_B], 0);
/* set input buffer flag */
set_ibf(i8255a, PORT_B, 1);
}
}
}
}
WRITE_LINE_DEVICE_HANDLER( i8255a_pc4_w )
{
i8255a_t *i8255a = get_safe_token(device);
if ((group_mode(i8255a, GROUP_A) == 2) || ((group_mode(i8255a, GROUP_A) == 1) && (port_mode(i8255a, PORT_A) == MODE_INPUT)))
{
/* port A strobe */
if (!i8255a->ibf[PORT_A] && !state)
{
if (LOG) logerror("8255A '%s' Port A Strobe\n", device->tag());
/* read port into latch */
i8255a->input[PORT_A] = devcb_call_read8(&i8255a->in_port_func[PORT_A], 0);
/* set input buffer flag */
set_ibf(i8255a, PORT_A, 1);
}
}
}
WRITE_LINE_DEVICE_HANDLER( i8255a_pc6_w )
{
i8255a_t *i8255a = get_safe_token(device);
if ((group_mode(i8255a, GROUP_A) == 2) || ((group_mode(i8255a, GROUP_A) == 1) && (port_mode(i8255a, PORT_A) == MODE_OUTPUT)))
{
/* port A acknowledge */
if (!i8255a->obf[PORT_A] && !state)
{
if (LOG) logerror("8255A '%s' Port A Acknowledge\n", device->tag());
/* clear output buffer flag */
set_obf(i8255a, PORT_A, 1);
}
}
}
/*-------------------------------------------------
DEVICE_START( i8255a )
-------------------------------------------------*/
static DEVICE_START( i8255a )
{
i8255a_t *i8255a = get_safe_token(device);
const i8255a_interface *intf = get_interface(device);
/* resolve callbacks */
devcb_resolve_read8(&i8255a->in_port_func[PORT_A], &intf->in_pa_func, device);
devcb_resolve_read8(&i8255a->in_port_func[PORT_B], &intf->in_pb_func, device);
devcb_resolve_read8(&i8255a->in_port_func[PORT_C], &intf->in_pc_func, device);
devcb_resolve_write8(&i8255a->out_port_func[PORT_A], &intf->out_pa_func, device);
devcb_resolve_write8(&i8255a->out_port_func[PORT_B], &intf->out_pb_func, device);
devcb_resolve_write8(&i8255a->out_port_func[PORT_C], &intf->out_pc_func, device);
/* register for state saving */
device->save_item(NAME(i8255a->control));
device->save_item(NAME(i8255a->output));
device->save_item(NAME(i8255a->input));
device->save_item(NAME(i8255a->ibf));
device->save_item(NAME(i8255a->obf));
device->save_item(NAME(i8255a->inte));
device->save_item(NAME(i8255a->inte1));
device->save_item(NAME(i8255a->inte2));
device->save_item(NAME(i8255a->intr));
}
/*-------------------------------------------------
DEVICE_RESET( i8255a )
-------------------------------------------------*/
static DEVICE_RESET( i8255a )
{
i8255a_w(device, CONTROL, 0x9b);
}
/*-------------------------------------------------
DEVICE_GET_INFO( i8255a )
-------------------------------------------------*/
DEVICE_GET_INFO( i8255a )
{
switch (state)
{
/* --- the following bits of info are returned as 64-bit signed integers --- */
case DEVINFO_INT_TOKEN_BYTES: info->i = sizeof(i8255a_t); break;
case DEVINFO_INT_INLINE_CONFIG_BYTES: info->i = 0; break;
/* --- the following bits of info are returned as pointers to data or functions --- */
case DEVINFO_FCT_START: info->start = DEVICE_START_NAME(i8255a); break;
case DEVINFO_FCT_STOP: /* Nothing */ break;
case DEVINFO_FCT_RESET: info->reset = DEVICE_RESET_NAME(i8255a); break;
/* --- the following bits of info are returned as NULL-terminated strings --- */
case DEVINFO_STR_NAME: strcpy(info->s, "Intel 8255A"); break;
case DEVINFO_STR_FAMILY: strcpy(info->s, "Intel 8080"); break;
case DEVINFO_STR_VERSION: strcpy(info->s, "1.0"); break;
case DEVINFO_STR_SOURCE_FILE: strcpy(info->s, __FILE__); break;
case DEVINFO_STR_CREDITS: strcpy(info->s, "Copyright MESS Team"); break;
}
}
DEFINE_LEGACY_DEVICE(I8255A, i8255a);

84
src/emu/machine/i8255a.h
View File

@ -1,84 +0,0 @@
/**********************************************************************
Intel 8255A Programmable Peripheral Interface emulation
Copyright MESS Team.
Visit http://mamedev.org for licensing and usage restrictions.
**********************************************************************
_____ _____
PA3 1 |* \_/ | 40 PA4
PA2 2 | | 39 PA5
PA1 3 | | 38 PA6
PA0 4 | | 37 PA7
_RD 5 | | 36 WR
_CS 6 | | 35 RESET
GND 7 | | 34 D0
A1 8 | | 33 D1
A0 9 | | 32 D2
PC7 10 | 8255A | 31 D3
PC6 11 | | 30 D4
PC5 12 | | 29 D5
PC4 13 | | 28 D6
PC0 14 | | 27 D7
PC1 15 | | 26 Vcc
PC2 16 | | 25 PB7
PC3 17 | | 24 PB6
PB0 18 | | 23 PB5
PB1 19 | | 22 PB4
PB2 20 |_____________| 21 PB3
**********************************************************************/
#ifndef __I8255A__
#define __I8255A__
#include "devlegcy.h"
/***************************************************************************
MACROS / CONSTANTS
***************************************************************************/
DECLARE_LEGACY_DEVICE(I8255A, i8255a);
#define MCFG_I8255A_ADD(_tag, _intrf) \
MCFG_DEVICE_ADD(_tag, I8255A, 0) \
MCFG_DEVICE_CONFIG(_intrf)
#define I8255A_INTERFACE(name) \
const i8255a_interface (name)=
/***************************************************************************
TYPE DEFINITIONS
***************************************************************************/
typedef struct _i8255a_interface i8255a_interface;
struct _i8255a_interface
{
devcb_read8 in_pa_func;
devcb_read8 in_pb_func;
devcb_read8 in_pc_func;
devcb_write8 out_pa_func;
devcb_write8 out_pb_func;
devcb_write8 out_pc_func;
};
/***************************************************************************
PROTOTYPES
***************************************************************************/
/* register access */
READ8_DEVICE_HANDLER( i8255a_r );
WRITE8_DEVICE_HANDLER( i8255a_w );
/* port access */
READ8_DEVICE_HANDLER( i8255a_pa_r );
READ8_DEVICE_HANDLER( i8255a_pb_r );
/* handshaking signals */
WRITE_LINE_DEVICE_HANDLER( i8255a_pc2_w );
WRITE_LINE_DEVICE_HANDLER( i8255a_pc4_w );
WRITE_LINE_DEVICE_HANDLER( i8255a_pc6_w );
#endif