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Commenting through most of the remaining files.

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Fixing logic errors throughout as well
This commit is contained in:
Ben V. Brown
2016-09-13 23:50:51 +10:00
parent 0b4068976c
commit 624fbe8e3f
19 changed files with 348 additions and 602 deletions
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37
workspace/ts100/src/2FAT12.c
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@@ -5,7 +5,8 @@
Author : bure & Celery
Data: 2015/08/03
History:
2015/08/03 ͳһ<CDB3><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
2016/09/13 Ben V. Brown -> English comments and cleaning up
2015/08/03
*******************************************************************************/
#include <string.h>
#include "FAT12.h"
@@ -16,11 +17,11 @@
#define FAT2_BASE 0x00002800 // FAT2
#define ROOT_BASE 0x00004000 //
#define FILE_BASE 0x00008000 //
#define SEC_LEN 0x200 //
#define FAT1_SEC 0x0C // FAT1
#define FAT2_SEC 0x0C // FAT2
#define SEC_LEN 512 //length of a sector -> 512 Bytes
#define FAT1_SEC 0x0C // FAT1 Sector
#define FAT2_SEC 0x0C // FAT2 Sector
#define OK 0 //
#define OK 0 //Error codes
#define SEC_ERR 1 //
#define FAT_ERR 2 //
#define OVER 3 //
@@ -31,7 +32,7 @@
#define RW 1 //
/*******************************************************************************
Function:
Function: NextCluster
Description:
Input:
*******************************************************************************/
@@ -49,25 +50,25 @@ u8 NextCluster(u16* pCluster) {
return OK;
}
/*******************************************************************************
Function:
Function: ReadFileSec
Description:
Input:
*******************************************************************************/
u8 ReadFileSec(u8* pBuffer, u16* pCluster) {
u32 ReadAddr = FILE_BASE + SEC_LEN * (*pCluster - 2);
//This code appears to read the data in two chunks of 256 bytes...
if (ReadDiskData(pBuffer, ReadAddr, 256) != OK)
return SEC_ERR; // <20><>ǰ<EFBFBD><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
return SEC_ERR; //
pBuffer += 256;
ReadAddr += 256;
if (ReadDiskData(pBuffer, ReadAddr, 256) != OK)
return SEC_ERR; // Failed to read the sector
if (NextCluster(pCluster) != 0)
return FAT_ERR; // ȡ<><C8A1>һ<EFBFBD><D2BB><EFBFBD>غ<EFBFBD>
return FAT_ERR; //
return OK;
}
/*******************************************************************************
Function:
Function: ProgFileSec
Description:
Input:
*******************************************************************************/
@@ -76,30 +77,30 @@ u8 ProgFileSec(u8* pBuffer, u16* pCluster) {
u32 ProgAddr = FILE_BASE + SEC_LEN * (*pCluster - 2);
if (ProgDiskPage(pBuffer, ProgAddr) != OK)
return SEC_ERR; // дǰ<D0B4><C7B0><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
return SEC_ERR; //
pBuffer += 256;
ProgAddr += 256;
if (ProgDiskPage(pBuffer, ProgAddr) != OK)
return SEC_ERR; // д<><D0B4><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
return SEC_ERR; //
Tmp = *pCluster;
switch (Tmp) {
case 0: // <20><><EFBFBD>дغ<D0B4>
case 1: // <20><><EFBFBD>дغ<D0B4>
case 0:
case 1:
if (SeekBlank(pBuffer, pCluster) != OK)
return OVER;
if (SetCluster(pBuffer, pCluster) != OK)
return SEC_ERR;
*(pCluster + 1) = Tmp;
return OK;
case END: // <20><><EFBFBD>ӽ<EFBFBD><D3BD><EFBFBD>
case END:
default:
if (NextCluster(pCluster) != OK)
return FAT_ERR; // ȡ<><C8A1>һ<EFBFBD><D2BB><EFBFBD>غ<EFBFBD>
return FAT_ERR;
return OK;
}
}
/*******************************************************************************
Function:
Function: SeekBlank
Description:
Input:
*******************************************************************************/