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src/dev/disk/woz_backup.c
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//
// woz.c
// A2Mac
//
// Created by Tamas Rudnai on 2/15/20.
// Copyright © 2020 GameAlloy. All rights reserved.
//
#include <stdlib.h>
#include <string.h>
#include "woz.h"
#include "disk.h"
#include "6502.h"
#include "common.h"
WOZread_t WOZread = {0};
uint8_t WOZlatch = 0;
int trackOffset = 0;
int bitOffset = 0;
uint64_t clkelpased;
woz_header_t woz_header;
woz_chunk_header_t woz_chunk_header;
woz_tmap_t woz_tmap;
woz_trks_t woz_trks;
int track_loaded = -1;
#pragma pack(push, 1)
typedef union trackEntry_u {
struct {
uint8_t data;
uint8_t shift;
};
uint16_t shift16;
} trackEntry_t;
#pragma pack(pop)
trackEntry_t prepared_track[WOZ_TRACK_BYTE_COUNT];
typedef enum readState_e {
readNormal = 0,
readHold,
} readState_t;
readState_t readState = readNormal;
uint8_t readLatch;
void woz_loadTrack_old( int track ) {
trackEntry_t reg = {0};
reg.shift = woz_trks[track].data[0];
reg.data = woz_trks[track].data[1];
prepared_track[0] = reg;
for ( int offs = 1; offs < WOZ_TRACK_BYTE_COUNT; offs++ ) {
for ( int i = 0; i < 8; i++ ) {
if (reg.shift & 0x80) {
reg.shift = 0;
}
reg.shift16 <<= 1;
}
reg.data = woz_trks[track].data[ (offs + 1) % WOZ_TRACK_BYTE_COUNT ];
prepared_track[offs] = reg;
}
}
typedef enum wozTrackState_e {
wozTrackState_Start = 0,
wozTrackState_D5,
wozTrackState_D5_AA,
wozTrackState_D5_AA_96,
wozTrackState_vol1,
wozTrackState_vol2,
wozTrackState_trk1,
wozTrackState_trk2,
wozTrackState_sec1,
wozTrackState_sec2,
} wozTrackState_t;
void woz_loadTrack( int track ) {
trackEntry_t reg = {0};
wozTrackState_t wozTrackState = wozTrackState_Start;
reg.shift = 0;
reg.data = 0;
prepared_track[0] = reg;
int vol = 0;
int trk = 0;
int sec = 0;
int bitOffs_D5_SecHdr = 0; // bit offset of D5 Sector Header
int bitOffs = 0;
for ( int byteOffs = 0; byteOffs < WOZ_TRACK_BYTE_COUNT; byteOffs++ ) {
reg.data = woz_trks[track].data[ byteOffs ];
for ( int i = 0; i < 8; i++ ) {
reg.shift16 <<= 1;
if (reg.shift & 0x80) {
switch (wozTrackState) {
case wozTrackState_D5:
switch (reg.shift) {
case 0xAA:
// printf("D5 AA at bitOffset:%d\n", bitOffs);
wozTrackState = wozTrackState_D5_AA;
break;
default:
wozTrackState = wozTrackState_Start;
break;
}
break;
case wozTrackState_D5_AA:
switch (reg.shift) {
case 0x96:
wozTrackState = wozTrackState_vol1;
// printf("D5 AA 96 at bitOffset:%d\n", bitOffs);
// printf("Sector Header at bitOffset:%d\n", bitOffs_D5_SecHdr);
break;
default:
wozTrackState = wozTrackState_Start;
break;
}
break;
case wozTrackState_vol1:
vol = (reg.shift << 1) | 1;
wozTrackState = wozTrackState_vol2;
break;
case wozTrackState_vol2:
vol &= reg.shift;
wozTrackState = wozTrackState_trk1;
break;
case wozTrackState_trk1:
trk = (reg.shift << 1) | 1;
wozTrackState = wozTrackState_trk2;
break;
case wozTrackState_trk2:
trk &= reg.shift;
wozTrackState = wozTrackState_sec1;
break;
case wozTrackState_sec1:
sec = (reg.shift << 1) | 1;
wozTrackState = wozTrackState_sec2;
break;
case wozTrackState_sec2:
sec &= reg.shift;
wozTrackState = wozTrackState_Start;
printf("Vol:%d Track:%d Sector:%d at bitOffset:%d\n", vol, trk, sec, bitOffs_D5_SecHdr);
break;
default:
if ( reg.shift == 0xD5 ) {
// printf("D5 at bitOffset:%d\n", bitOffs);
wozTrackState = wozTrackState_D5;
bitOffs_D5_SecHdr = bitOffs;
}
break;
}
reg.shift = 0;
}
bitOffs++;
}
}
}
uint8_t woz_read() {
int track = woz_tmap.phase[disk.phase.count];
if (outdev) fprintf(outdev, "track: %d (%d) ", track, disk.phase.count);
if ( track >= 40 ) {
dbgPrintf("TRCK TOO HIGH!\n");
return rand();
}
#ifdef WOZ_REAL_SPIN
if ( track != track_loaded ) {
woz_loadTrack(track);
track_loaded = track;
}
WOZread.shift32 = 0;
bitOffset = (m6502.clktime >> 2) & 7;
trackOffset = (m6502.clktime >> 5) % WOZ_TRACK_BYTE_COUNT;
WOZread.next = woz_trks[track].data[ (trackOffset +1) % WOZ_TRACK_BYTE_COUNT ];
WOZread.data = woz_trks[track].data[ trackOffset ];
WOZread.prev = woz_trks[track].data[ (trackOffset -1) % WOZ_TRACK_BYTE_COUNT ];
WOZread.shift = woz_trks[track].data[ (trackOffset -2) % WOZ_TRACK_BYTE_COUNT ];
printf("clk:%llu bo:%u to:%u W:%08X\n", m6502.clktime, bitOffset, trackOffset, WOZread.shift32);
uint8_t state = 0;
// simulating the continous shift register in Disk ][
for (int i = bitOffset + 16; i; --i) {
WOZread.shift32 <<= 1;
switch (state) {
case 0:
WOZlatch = WOZread.shift;
if ( WOZread.valid ) {
state = 1;
WOZread.shift = 0;
}
break;
case 1:
// we do not latch the shift register for one 4us cycle
state = 0;
break;
default:
// this should not happen
state = 0;
break;
}
// printf("shft1: W:%08X L:%02X\n", WOZread.shift32, WOZlatch);
}
printf("clk:%llu bo:%u to:%u W:%08X B:%02X\n", m6502.clktime, bitOffset, trackOffset, WOZread.shift32, WOZlatch);
if ( WOZlatch & 0x80 ) {
printf("WOZlatch: %02X\n", WOZlatch);
static int readState = 0;
static int vol = 0;
static int trk = 0;
static int sec = 0;
switch (readState) {
case 0:
if ( 0xD5 == WOZlatch ) readState = 1;
else readState = 0;
break;
case 1:
if ( 0xAA == WOZlatch ) readState = 2;
else readState = 0;
break;
case 2:
if ( 0x96 == WOZlatch ) {
readState = 3;
printf("sector header marker\n");
}
else if ( 0xAD == WOZlatch ) {
readState = 10;
printf("sector data marker\n");
}
else readState = 0;
break;
case 3: // sector header, vol number 1
readState++;
vol = (WOZlatch << 1) | 1;
break;
case 4: // sector header, vol number 2
readState++;
vol &= WOZlatch;
printf("vol:%u ", vol);
break;
case 5: // sector header, trk number 1
readState++;
trk = (WOZlatch << 1) | 1;
break;
case 6: // sector header, trk number 2
readState++;
trk &= WOZlatch;
printf("trk:%u ", trk);
break;
case 7: // sector header, sec number 1
readState++;
sec = (WOZlatch << 1) | 1;
break;
case 8: // sector header, sec number 2
readState = 0;
sec &= WOZlatch;
printf("sec:%u\n", sec);
break;
default:
readState = 0;
break;
}
}
// switch ( WOZlatch ) {
// case 0xAA:
// case 0x96:
//// printf("%02X ", WOZlatch);
// printf("clk:%llu bo:%u to:%u B:%02X\n", m6502.clktime, bitOffset, trackOffset, WOZlatch);
// break;
//
// default:
// break;
// }
return WOZlatch;
#elif defined( WOZ_REAL_SPIN2 )
// clkelpased = m6502.clktime - disk.clk_last_read;
// disk.clk_last_read = m6502.clktime;
bitOffset = (m6502.clktime >> 2) & 7;
trackOffset = (m6502.clktime >> 5) % WOZ_TRACK_BYTE_COUNT;
trackEntry_t reg = prepared_track[trackOffset];
do {
switch (readState) {
case readNormal:
readLatch = reg.shift;
break;
case readHold:
default:
readState = readNormal;
break;
}
if (reg.shift & 0x80) {
reg.shift = 0;
readState = readHold;
}
reg.shift16 <<= 1;
} while ( --bitOffset > 0 );
printf("READ: clk:%llu to:%u bo:%llu B:%02X\n", m6502.clktime, trackOffset, (m6502.clktime >> 2) & 7, readLatch);
return readLatch;
#elif defined( WOZ_SEARCH_NEXTSECT )
static int clkBeforeSync = 0;
clkelpased = m6502.clktime + clkfrm - m6502.clklast;
m6502.clklast = m6502.clktime + clkfrm;
clkBeforeSync += clkelpased;
const int clkBeforeAdjusting = 1024;
const int magicShiftOffset = 8192;
uint16_t usedBytes = woz_trks[track].bytes_used < WOZ_TRACK_BYTE_COUNT ? woz_trks[track].bytes_used : WOZ_TRACK_BYTE_COUNT;
if ( usedBytes ) {
// printf("elpased : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
if ( clkelpased > clkBeforeAdjusting ) {
// printf("NEED SYNC : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
clkBeforeSync = 0;
// bitOffset = (clkelpased >> 2) & 7;
// bitOffset = 0;
// trackOffset += clkelpased >> 5;
// trackOffset %= usedBytes;
// preroll data stream
// WOZread.shift16 = 0;
// WOZread.data = woz_trks[track].data[trackOffset++];
// trackOffset %= usedBytes;
// WOZread.shift16 <<= bitOffset;
int w = 2; // 2 x 0xD5
for ( int i = 0; i < usedBytes * 8; i++ ) {
if ( ++bitOffset >= 8 ) {
bitOffset = 0;
trackOffset++;
trackOffset %= usedBytes;
WOZread.data = woz_trks[track].data[trackOffset];
}
WOZread.shift16 <<= 1;
if ( WOZread.valid ) {
uint8_t byte = WOZread.shift;
WOZread.shift = 0;
// find next sector or end of sector
if ( byte == 0xD5 ) {
// actually 2 sectors, because of DOS 3.3 interleaving algoritm
if ( --w <= 0 ) {
return byte;
}
}
}
}
}
// to avoid infinite loop and to search for bit 7 high
for ( int i = 0; i < usedBytes * 8; i++ ) {
if ( ++bitOffset >= 8 ) {
bitOffset = 0;
// if ( ++trackOffset >= WOZ_TRACK_BYTE_COUNT ) {
// trackOffset = 0;
// }
trackOffset++;
trackOffset %= usedBytes;
// printf("offs:%u\n", trackOffset);
WOZread.data = woz_trks[track].data[trackOffset];
}
WOZread.shift16 <<= 1;
if ( WOZread.valid ) {
uint8_t byte = WOZread.shift;
// printf("%02X ", byte);
WOZread.shift = 0;
if (outdev) fprintf(outdev, "byte: %02X\n", byte);
return byte;
}
}
if (outdev) fprintf(outdev, "TIME OUT!\n");
}
return rand();
#else // WOZ_REAL_SPIN
static int clkBeforeSync = 0;
clkelpased = m6502.clktime + clkfrm - m6502.clklast;
m6502.clklast = m6502.clktime + clkfrm;
clkBeforeSync += clkelpased;
const int clkBeforeAdjusting = 512;
const int magicShiftOffset = 50;
uint16_t usedBytes = woz_trks[track].bytes_used < WOZ_TRACK_BYTE_COUNT ? woz_trks[track].bytes_used : WOZ_TRACK_BYTE_COUNT;
if ( usedBytes ) {
// printf("elpased : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
if ( clkelpased > clkBeforeAdjusting ) {
// printf("NEED SYNC : %llu (clkBefRd:%d)\n", clkelpased, clkBeforeSync);
clkBeforeSync = 0;
bitOffset = (clkelpased >> 2) & 7;
trackOffset += clkelpased >> 5;
trackOffset %= usedBytes;
// preroll data stream
WOZread.shift16 = 0;
WOZread.data = woz_trks[track].data[trackOffset++];
trackOffset %= usedBytes;
WOZread.shift16 <<= bitOffset;
for ( int i = 0; i < magicShiftOffset; i++ ) {
for ( ; bitOffset < 8; bitOffset++ ) {
WOZread.shift16 <<= 1;
if ( WOZread.valid ) {
WOZread.shift = 0;
}
}
WOZread.data = woz_trks[track].data[trackOffset++];
trackOffset %= usedBytes;
bitOffset = 0;
}
}
else {
uint64_t bitForward = (clkelpased >> 2);
// to avoid infinite loop and to search for bit 7 high
for ( uint64_t i = 0; i < bitForward; i++ ) {
if ( ++bitOffset >= 8 ) {
bitOffset = 0;
trackOffset++;
trackOffset %= usedBytes;
WOZread.data = woz_trks[track].data[trackOffset];
}
WOZread.shift16 <<= 1;
if ( WOZread.valid ) {
WOZread.shift = 0;
}
}
}
// to avoid infinite loop and to search for bit 7 high
for ( int i = 0; i < usedBytes * 8; i++ ) {
if ( WOZread.valid ) {
uint8_t byte = WOZread.shift;
WOZread.shift = 0;
// if (outdev) fprintf(outdev, "byte: %02X\n", byte);
return byte;
}
if ( ++bitOffset >= 8 ) {
bitOffset = 0;
trackOffset++;
trackOffset %= usedBytes;
WOZread.data = woz_trks[track].data[trackOffset];
}
WOZread.shift16 <<= 1;
}
// if (outdev) fprintf(outdev, "TIME OUT!\n");
}
return rand();
#endif // WOZ_REAL_SPIN
}
int woz_loadFile( const char * filename ) {
// char fullpath[256];
//
// strcpy(fullpath, resourcePath);
// strcat(fullpath, "/");
// strcat(fullpath, filename);
FILE * f = fopen(filename, "rb");
if (f == NULL) {
perror("Failed to read WOZ: ");
return WOZ_ERR_FILE_NOT_FOUND;
}
fread( &woz_header, 1, sizeof(woz_header_t), f);
if ( woz_header.magic != WOZ1_MAGIC ) {
return WOZ_ERR_NOT_WOZ_FILE;
}
while ( ! feof(f) ) {
// beginning of the chunk, so we can skip it later
long r = fread( &woz_chunk_header, 1, sizeof(woz_chunk_header_t), f);
if ( r != sizeof(woz_chunk_header_t) ) {
if ( r ) {
return WOZ_ERR_BAD_CHUNK_HDR;
}
// ok we just reached the end of the file, we should exit properly, close file handle etc
break;
}
long foffs = ftell(f);
void * buf = NULL;
switch ( woz_chunk_header.magic ) {
case WOZ_INFO_CHUNK_ID:
break;
case WOZ_TMAP_CHUNK_ID:
buf = &woz_tmap;
break;
case WOZ_TRKS_CHUNK_ID:
buf = woz_trks;
break;
case WOZ_META_CHUNK_ID:
break;
default:
break;
}
if (buf) {
r = fread( buf, 1, woz_chunk_header.size, f);
if ( r != woz_chunk_header.size ) {
return WOZ_ERR_BAD_DATA;
}
}
// make sure we are skipping unhandled chunks correctly
fseek(f, foffs + woz_chunk_header.size, SEEK_SET);
}
fclose(f);
// DO NOT COMMIT THIS! ONLY FOR DEBUG!!!
// woz_loadTrack(0x11);
return WOZ_ERR_OK;
}