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DiskFormat: tweaks and fixed some TODOs in comments

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This commit is contained in:
tomcw 2018-01-20 17:18:24 +00:00
parent 4a69ba8a97
commit 02a6df73c5
5 changed files with 27 additions and 27 deletions
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2
source/DiskDefs.h
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@ -1,3 +1,5 @@
#pragma once
#define NIBBLES_PER_TRACK 0x1A00
const UINT NUM_SECTORS = 16;

30
source/DiskFormatTrack.cpp
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@ -120,13 +120,13 @@ void FormatTrack::DriveSwitchedToReadMode(Disk_t* const fptr)
// Either up to 0x18F0 (if less than 0x18F0) or up to 0x1A00 (for .nib).
// When there's no spin (enhanced=1), then 0x18F0 is still too long, eg: (see GH#125)
// Gap1 = 0x81, Gap3 = 0x1D (29), TrackSize = 0x1963
// Gap1 = 0x81, Gap3 = 0x1C (28), TrackSize = 0x1954
// Gap1 = 0x81, Gap3 = 0x1B (27), TrackSize = 0x1945
// Gap1 = 0x81, Gap3 = 0x1A (26), TrackSize = 0x1936
// Gap1 = 0x81, Gap2 = 0x05, Gap3 = 0x1D (29), TrackSize = 0x1963
// Gap1 = 0x81, Gap2 = 0x05, Gap3 = 0x1C (28), TrackSize = 0x1954
// Gap1 = 0x81, Gap2 = 0x05, Gap3 = 0x1B (27), TrackSize = 0x1945
// Gap1 = 0x81, Gap2 = 0x05, Gap3 = 0x1A (26), TrackSize = 0x1936
//
// 0x1936 - 0x81(gap1) = 0x18B5
// So need a track size of 0x18B0 (rounding down)
// And 0x1936 - 0x81(gap1) = 0x18B5
// So need a track size between 0x18B0 (rounding down) and 0x182F
const UINT kShortTrackLen = 0x18B0;
LPBYTE TrackBuffer = fptr->trackimage;
@ -171,22 +171,18 @@ void FormatTrack::DriveSwitchedToReadMode(Disk_t* const fptr)
void FormatTrack::DriveSwitchedToWriteMode(UINT uTrackIndex)
{
DecodeLatchNibbleReset();
if (m_bmWrittenSectorAddrFields == 0x0000) // written no sectors
{
m_WriteTrackStartIndex = (UINT)-1; // wait for 1st write
}
}
void FormatTrack::DecodeLatchNibbleReset(void)
{
// ProDOS: switches to write mode between Address Field & Gap2; and between Data Field & Gap3
// ProDOS/DOS3.3: during track write, switches to read mode then back to write mode:
// . between Address Field & Gap2; and between Data Field & Gap3
// . so if at TS_GAP2_START then stay at TS_GAP2_START
if (m_trackState != TS_GAP2_START)
m_trackState = (m_bmWrittenSectorAddrFields == 0x0000) ? TS_GAP1 : TS_GAP3;
m_uLast3Bytes = 0;
m_4and4idx = 0;
if (m_bmWrittenSectorAddrFields == 0x0000) // written no sectors
{
m_WriteTrackStartIndex = (UINT)-1; // wait for 1st write
}
}
// This is just for debug/logging: used to output when a new Address Field has been read

1
source/DiskFormatTrack.h
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@ -43,7 +43,6 @@ public:
void LoadSnapshot(class YamlLoadHelper& yamlLoadHelper);
private:
void DecodeLatchNibbleReset(void);
void UpdateOnWriteLatch(UINT uSpinNibbleCount, const Disk_t* const fptr);
void DecodeLatchNibble(BYTE floppylatch, BOOL bIsWrite);

18
source/DiskImageHelper.cpp
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@ -419,8 +419,8 @@ void CImageBase::DenibblizeTrack(LPBYTE trackimage, SectorOrder_e SectorOrder, i
#endif
int offset = 0;
int partsleft = 33; // TODO-TC: 32 = 16*2 prologues
int sector = 0;
int partsleft = NUM_SECTORS*2+1; // TC: 32+1 prologues - need 1 extra if trackimage starts between Addr Field & Data Field
int sector = -1;
while (partsleft--)
{
BYTE byteval[3] = {0,0,0};
@ -454,8 +454,8 @@ void CImageBase::DenibblizeTrack(LPBYTE trackimage, SectorOrder_e SectorOrder, i
| (*(ms_pWorkBuffer+TRACK_DENIBBLIZED_SIZE+5) & 0x55);
#ifdef _DEBUG
_ASSERT( sector <= 15 );
if (partsleft != 0) // Don't need this if partsleft is initialised to 32 (not 33)
_ASSERT( sector < NUM_SECTORS );
if (partsleft != 0)
{
_ASSERT( (bmWrittenSectorAddrFields & (1<<sector)) == 0 );
bmWrittenSectorAddrFields |= (1<<sector);
@ -464,12 +464,14 @@ void CImageBase::DenibblizeTrack(LPBYTE trackimage, SectorOrder_e SectorOrder, i
}
else if (byteval[2] == 0xAD)
{
if (sector >= 0 && sector < NUM_SECTORS)
{
#ifdef _DEBUG
uWriteDataFieldPrologueCount++;
_ASSERT(uWriteDataFieldPrologueCount <= 16);
uWriteDataFieldPrologueCount++;
_ASSERT(uWriteDataFieldPrologueCount <= NUM_SECTORS);
#endif
Decode62(ms_pWorkBuffer+(ms_SectorNumber[SectorOrder][sector] << 8));
Decode62(ms_pWorkBuffer+(ms_SectorNumber[SectorOrder][sector] << 8));
}
sector = 0;
}
}

3
source/DiskImageHelper.h
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@ -1,5 +1,6 @@
#pragma once
#include "DiskDefs.h"
#include "zip.h"
#define GZ_SUFFIX ".gz"
@ -90,7 +91,7 @@ public:
protected:
static BYTE ms_DiskByte[0x40];
static BYTE ms_SectorNumber[NUM_SECTOR_ORDERS][0x10];
static BYTE ms_SectorNumber[NUM_SECTOR_ORDERS][NUM_SECTORS];
BYTE m_uVolumeNumber;
};