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upd765: Externalize the fdc [O. Galibert]

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This commit is contained in:
Olivier Galibert 2012-11-27 16:55:25 +00:00
parent 958c5307e1
commit a219677251
5 changed files with 153 additions and 120 deletions
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1
src/emu/emu.mak
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@ -181,6 +181,7 @@ EMUMACHINEOBJS = \
$(EMUMACHINE)/eeprom.o \
$(EMUMACHINE)/er2055.o \
$(EMUMACHINE)/f3853.o \
$(EMUMACHINE)/fdc_pll.o \
$(EMUMACHINE)/generic.o \
$(EMUMACHINE)/i2cmem.o \
$(EMUMACHINE)/i8155.o \

121
src/emu/machine/fdc_pll.c
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@ -0,0 +1,121 @@
#include "fdc_pll.h"
void fdc_pll_t::set_clock(attotime _period)
{
period = _period;
period_adjust_base = period * 0.05;
min_period = period * 0.75;
max_period = period * 1.25;
}
void fdc_pll_t::reset(attotime when)
{
ctime = when;
phase_adjust = attotime::zero;
freq_hist = 0;
write_position = 0;
write_start_time = attotime::never;
}
void fdc_pll_t::start_writing(attotime tm)
{
write_start_time = tm;
write_position = 0;
}
void fdc_pll_t::stop_writing(floppy_image_device *floppy, attotime tm)
{
commit(floppy, tm);
write_start_time = attotime::never;
}
void fdc_pll_t::commit(floppy_image_device *floppy, attotime tm)
{
if(write_start_time.is_never() || tm == write_start_time)
return;
if(floppy)
floppy->write_flux(write_start_time, tm, write_position, write_buffer);
write_start_time = tm;
write_position = 0;
}
int fdc_pll_t::get_next_bit(attotime &tm, floppy_image_device *floppy, attotime limit)
{
attotime edge = floppy ? floppy->get_next_transition(ctime) : attotime::never;
attotime next = ctime + period + phase_adjust;
#if 0
if(!edge.is_never())
fprintf(stderr, "ctime=%s, transition_time=%s, next=%s, pha=%s\n", tts(ctime).cstr(), tts(edge).cstr(), tts(next).cstr(), tts(phase_adjust).cstr());
#endif
if(next > limit)
return -1;
ctime = next;
tm = next;
if(edge.is_never() || edge >= next) {
// No transition in the window means 0 and pll in free run mode
phase_adjust = attotime::zero;
return 0;
}
// Transition in the window means 1, and the pll is adjusted
attotime delta = edge - (next - period/2);
if(delta.seconds < 0)
phase_adjust = attotime::zero - ((attotime::zero - delta)*65)/100;
else
phase_adjust = (delta*65)/100;
if(delta < attotime::zero) {
if(freq_hist < 0)
freq_hist--;
else
freq_hist = -1;
} else if(delta > attotime::zero) {
if(freq_hist > 0)
freq_hist++;
else
freq_hist = 1;
} else
freq_hist = 0;
if(freq_hist) {
int afh = freq_hist < 0 ? -freq_hist : freq_hist;
if(afh > 1) {
attotime aper = attotime::from_double(period_adjust_base.as_double()*delta.as_double()/period.as_double());
period += aper;
if(period < min_period)
period = min_period;
else if(period > max_period)
period = max_period;
}
}
return 1;
}
bool fdc_pll_t::write_next_bit(bool bit, attotime &tm, floppy_image_device *floppy, attotime limit)
{
if(write_start_time.is_never()) {
write_start_time = ctime;
write_position = 0;
}
attotime etime = ctime + period;
if(etime > limit)
return true;
if(bit && write_position < ARRAY_LENGTH(write_buffer))
write_buffer[write_position++] = ctime + period/2;
tm = etime;
ctime = etime;
return false;
}

29
src/emu/machine/fdc_pll.h
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@ -0,0 +1,29 @@
#ifndef __FDC_PLL_H__
#define __FDC_PLL_H__
/*
* Generic pll class for floppy controllers with analog plls
*/
#include "emu.h"
#include "imagedev/floppy.h"
class fdc_pll_t {
public:
attotime ctime, period, min_period, max_period, period_adjust_base, phase_adjust;
attotime write_start_time;
attotime write_buffer[32];
int write_position;
int freq_hist;
void set_clock(attotime period);
void reset(attotime when);
int get_next_bit(attotime &tm, floppy_image_device *floppy, attotime limit);
bool write_next_bit(bool bit, attotime &tm, floppy_image_device *floppy, attotime limit);
void start_writing(attotime tm);
void commit(floppy_image_device *floppy, attotime tm);
void stop_writing(floppy_image_device *floppy, attotime tm);
};
#endif

119
src/emu/machine/upd765.c
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@ -2153,125 +2153,6 @@ bool upd765_family_device::sector_matches() const
cur_live.idbuf[3] == command[5];
}
void upd765_family_device::pll_t::set_clock(attotime _period)
{
period = _period;
period_adjust_base = period * 0.05;
min_period = period * 0.75;
max_period = period * 1.25;
}
void upd765_family_device::pll_t::reset(attotime when)
{
ctime = when;
phase_adjust = attotime::zero;
freq_hist = 0;
write_position = 0;
write_start_time = attotime::never;
}
void upd765_family_device::pll_t::start_writing(attotime tm)
{
write_start_time = tm;
write_position = 0;
}
void upd765_family_device::pll_t::stop_writing(floppy_image_device *floppy, attotime tm)
{
commit(floppy, tm);
write_start_time = attotime::never;
}
void upd765_family_device::pll_t::commit(floppy_image_device *floppy, attotime tm)
{
if(write_start_time.is_never() || tm == write_start_time)
return;
if(floppy)
floppy->write_flux(write_start_time, tm, write_position, write_buffer);
write_start_time = tm;
write_position = 0;
}
int upd765_family_device::pll_t::get_next_bit(attotime &tm, floppy_image_device *floppy, attotime limit)
{
attotime edge = floppy ? floppy->get_next_transition(ctime) : attotime::never;
attotime next = ctime + period + phase_adjust;
#if 0
if(!edge.is_never())
fprintf(stderr, "ctime=%s, transition_time=%s, next=%s, pha=%s\n", tts(ctime).cstr(), tts(edge).cstr(), tts(next).cstr(), tts(phase_adjust).cstr());
#endif
if(next > limit)
return -1;
ctime = next;
tm = next;
if(edge.is_never() || edge >= next) {
// No transition in the window means 0 and pll in free run mode
phase_adjust = attotime::zero;
return 0;
}
// Transition in the window means 1, and the pll is adjusted
attotime delta = edge - (next - period/2);
if(delta.seconds < 0)
phase_adjust = attotime::zero - ((attotime::zero - delta)*65)/100;
else
phase_adjust = (delta*65)/100;
if(delta < attotime::zero) {
if(freq_hist < 0)
freq_hist--;
else
freq_hist = -1;
} else if(delta > attotime::zero) {
if(freq_hist > 0)
freq_hist++;
else
freq_hist = 1;
} else
freq_hist = 0;
if(freq_hist) {
int afh = freq_hist < 0 ? -freq_hist : freq_hist;
if(afh > 1) {
attotime aper = attotime::from_double(period_adjust_base.as_double()*delta.as_double()/period.as_double());
period += aper;
if(period < min_period)
period = min_period;
else if(period > max_period)
period = max_period;
}
}
return 1;
}
bool upd765_family_device::pll_t::write_next_bit(bool bit, attotime &tm, floppy_image_device *floppy, attotime limit)
{
if(write_start_time.is_never()) {
write_start_time = ctime;
write_position = 0;
}
attotime etime = ctime + period;
if(etime > limit)
return true;
if(bit && write_position < ARRAY_LENGTH(write_buffer))
write_buffer[write_position++] = ctime + period/2;
tm = etime;
ctime = etime;
return false;
}
upd765a_device::upd765a_device(const machine_config &mconfig, const char *tag, device_t *owner, UINT32 clock) : upd765_family_device(mconfig, UPD765A, "UPD765A", tag, owner, clock)
{

3
src/emu/machine/upd765.h
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@ -3,6 +3,7 @@
#include "emu.h"
#include "imagedev/floppy.h"
#include "fdc_pll.h"
/*
* ready = true if the ready line is physically connected to the floppy drive
@ -272,7 +273,7 @@ protected:
bool data_separator_phase, data_bit_context;
UINT8 data_reg;
UINT8 idbuf[6];
pll_t pll;
fdc_pll_t pll;
};
static int rates[4];