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Rewrote the implementation of the SwapEndian_16() and SwapEndian_32() functions so that they compile down in most instances to minimal loads and stores rather than complicated shifts.

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Fixed SCSI.c implementations of all the demos/projects casting the block count to a 32-bit temporary before calling SwapEndian_16().
This commit is contained in:
Dean Camera 2010-07-09 07:24:34 +00:00
parent 2b0e86243f
commit c326fe9605
8 changed files with 60 additions and 37 deletions
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16
Demos/Device/ClassDriver/MassStorageKeyboard/Lib/SCSI.c
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@ -170,7 +170,7 @@ static bool SCSI_Command_Inquiry(USB_ClassInfo_MS_Device_t* MSInterfaceInfo)
uint8_t PadBytes[AllocationLength - BytesTransferred];
/* Pad out remaining bytes with 0x00 */
Endpoint_Write_Stream_LE(&PadBytes, (AllocationLength - BytesTransferred), NO_STREAM_CALLBACK);
Endpoint_Write_Stream_LE(&PadBytes, sizeof(PadBytes), NO_STREAM_CALLBACK);
/* Finalize the stream transfer to send the last packet */
Endpoint_ClearIN();
@ -196,7 +196,7 @@ static bool SCSI_Command_Request_Sense(USB_ClassInfo_MS_Device_t* MSInterfaceInf
uint8_t PadBytes[AllocationLength - BytesTransferred];
Endpoint_Write_Stream_LE(&SenseData, BytesTransferred, NO_STREAM_CALLBACK);
Endpoint_Write_Stream_LE(&PadBytes, (AllocationLength - BytesTransferred), NO_STREAM_CALLBACK);
Endpoint_Write_Stream_LE(&PadBytes, sizeof(PadBytes), NO_STREAM_CALLBACK);
Endpoint_ClearIN();
/* Succeed the command and update the bytes transferred counter */
@ -306,15 +306,11 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* MSInterfaceInfo
uint32_t BlockAddress;
uint16_t TotalBlocks;
/* Load in the 32-bit block address (SCSI uses big-endian, so have to do it byte-by-byte) */
((uint8_t*)&BlockAddress)[3] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[2];
((uint8_t*)&BlockAddress)[2] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[3];
((uint8_t*)&BlockAddress)[1] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[4];
((uint8_t*)&BlockAddress)[0] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[5];
/* Load in the 32-bit block address (SCSI uses big-endian, so have to reverse the byte order) */
BlockAddress = SwapEndian_32(*(uint32_t*)&CommandBlock.SCSICommandData[2]);
/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to do it byte-by-byte) */
((uint8_t*)&TotalBlocks)[1] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[7];
((uint8_t*)&TotalBlocks)[0] = MSInterfaceInfo->State.CommandBlock.SCSICommandData[8];
/* Load in the 16-bit total blocks (SCSI uses big-endian, so have to reverse the byte order) */
TotalBlocks = SwapEndian_16(*(uint16_t*)&CommandBlock.SCSICommandData[7]);
/* Check if the block address is outside the maximum allowable value for the LUN */
if (BlockAddress >= LUN_MEDIA_BLOCKS)