Refactor macros in the VirtualFAT implementation of the incomplete Mass Storage bootl...

[pub/USBasp.git] / Bootloaders / Incomplete / MassStorage / Lib / VirtualFAT.c

diff --git a/Bootloaders/Incomplete/MassStorage/Lib/VirtualFAT.c b/Bootloaders/Incomplete/MassStorage/Lib/VirtualFAT.c
index 2365ba5..883586c 100644 (file)
--- a/Bootloaders/Incomplete/MassStorage/Lib/VirtualFAT.c
+++ b/Bootloaders/Incomplete/MassStorage/Lib/VirtualFAT.c
@@ -30,15 +30,6 @@
 
 #include "VirtualFAT.h"
 
-#define FAT_TIME(h, m, s)      ((h << 11) | (m << 5) | (s >> 1))
-#define FAT_DATE(d, m, y)      (((y - 1980) << 9) | (m << 5) | (d << 0))
-
-#define SECTOR_SIZE_BYTES      VIRTUAL_MEMORY_BLOCK_SIZE
-#define SECTOR_PER_CLUSTER     4
-#define CLUSTER_SIZE_BYTES     (SECTOR_PER_CLUSTER * SECTOR_SIZE_BYTES)
-
-#define FILE_CLUSTERS(size)    (size / CLUSTER_SIZE_BYTES)
-
 static const FATBootBlock_t BootBlock =
        {
                .Bootstrap               = {0xEB, 0x3C, 0x90},
@@ -47,7 +38,7 @@ static const FATBootBlock_t BootBlock =
                .SectorsPerCluster       = SECTOR_PER_CLUSTER,
                .ReservedSectors         = 1,
                .FATCopies               = 2,
-               .RootDirectoryEntries    = SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t),
+               .RootDirectoryEntries    = (SECTOR_SIZE_BYTES / sizeof(FATDirectoryEntry_t)),
                .TotalSectors16          = LUN_MEDIA_BLOCKS,
                .MediaDescriptor         = 0xF8,
                .SectorsPerFAT           = 1,
@@ -76,6 +67,7 @@ static FATDirectoryEntry_t FirmwareFileEntry =
                .FileSizeBytes   = 2049,
        };
 
+
 static void WriteBlock(uint16_t BlockNumber)
 {
        uint8_t BlockBuffer[512];
@@ -156,6 +148,8 @@ void VirtualFAT_WriteBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 {
        uint16_t CurrentBlock = (uint16_t)BlockAddress;
 
+       /* Emulated FAT is performed per-block, pass each requested block index
+        * to the emulation function */
        while (TotalBlocks--)
          WriteBlock(CurrentBlock++);
 }
@@ -166,6 +160,8 @@ void VirtualFAT_ReadBlocks(USB_ClassInfo_MS_Device_t* const MSInterfaceInfo,
 {
        uint16_t CurrentBlock = (uint16_t)BlockAddress;
 
+       /* Emulated FAT is performed per-block, pass each requested block index
+        * to the emulation function */
        while (TotalBlocks--)
          ReadBlock(CurrentBlock++);
 }