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/* Copyright (c) 2010, Peter Barrett
**
** Permission to use, copy, modify, and/or distribute this software for
** any purpose with or without fee is hereby granted, provided that the
** above copyright notice and this permission notice appear in all copies.
**
** THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
** WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
** WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR
** BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES
** OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
** WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
** ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
** SOFTWARE.
*/
#include "Platform.h"
#ifdef MSC_ENABLED
// SCSI Commands
#define TEST_UNIT_READY 0x00
#define REQUEST_SENSE 0x03
#define FORMAT_UNIT 0x04
#define INQUIRY 0x12
#define MODE_SENSE 0x1A
#define START_STOP_UNIT 0x1B
#define MEDIA_REMOVAL 0x1E
#define READ_FORMAT_CAPACITIES 0x23
#define READ_CAPACITY 0x25
#define READ10 0x28
#define WRITE10 0x2A
#define VERIFY10 0x2F
// In FakeFAT
void SendSector(u8 b);
void RecvSector(u8 b);
// In USBCore
u8 RecvPacket(u8 ep, u8* dst, u8 len);
u8 SendPacket(u8 ep, const u8* src, u8 len);
void Reboot();
#define MSC_TX MSC_ENDPOINT_IN
#define MSC_RX MSC_ENDPOINT_OUT
extern const u8 P_Inquiry[36] PROGMEM;
extern const u8 P_RequestSense[18] PROGMEM;
extern const u8 P_ReadCapacity[8-3] PROGMEM;
extern const u8 P_ModeSense[4] PROGMEM;
typedef struct
{
u8 signature[4];
u8 tag[4];
u32 transferLength;
u8 flags;
u8 lun;
u8 cblength;
u8 cb[16];
} CBW;
const u8 P_Inquiry[36] =
{
0x00, // Direct Access Device
0x80, // Removable Medium
0x00, // Version
0x01,
36-4, // Additional Length
0x80, // Storage Controller Component
0x00,
0x00,
'r','o','s','s','u','m','u','r', // Vendor
'm','i','c','r','o','t','o','u', // Product
'c','h',' ',' ',' ',' ',' ',' ',
'2','.','4',' ' // Revision
};
const u8 P_RequestSense[18] =
{
0x70, // Response Code
0x00,
// 0x02, // Sense Key
0x00,
0x00,
0x00,
0x00,
0x00,
0x0A, // Additional Length
0x00,
0x00,
0x00,
0x00,
0x30, // ASC
0x01, // ASCQ
0x00,
0x00,
0x00,
0x00
};
// Save 3 bytes if merging
const u8 P_ReadCapacity[8-3] =
{
// 0x00,
// 0x00,
// 0x00, // Steal 3 zero bytes from end of P_RequestSense
64+4, // block count 64 + 4
0x00,
0x00,
0x02, // block size = 512
0x00
};
const u8 P_ModeSense[4] =
{
0x03,
0x00,
0x00,
0x00
};
extern volatile u8 _ejected;
void SCSI(CBW& cbw)
{
const u8* pgm = 0;
u8 status = 0;
u8 blen = 0;
u8 cmd = cbw.cb[0];
if (START_STOP_UNIT == cmd)
{
_ejected = 1; // Stopped; going away
}
else if (TEST_UNIT_READY == cmd || MEDIA_REMOVAL == cmd)
{
#ifdef MSC_NO_MEDIA
status = 1;
#else
status = _ejected;
#endif
}
else if (REQUEST_SENSE == cmd)
{
pgm = P_RequestSense;
blen = sizeof(P_RequestSense);
}
else if (INQUIRY == cmd)
{
pgm = P_Inquiry;
blen = sizeof(P_Inquiry);
}
else if (WRITE10 == cmd || READ10 == cmd)
{
// Write 10 byte form
// Read 10 byte form
{
u8 lba = cbw.cb[5];
u8 count = cbw.cb[8];
u8 read = READ10 == cbw.cb[0];
while (count--)
{
if (read)
SendSector(lba);
else
RecvSector(lba);
lba++;
cbw.transferLength -= 512; // 24 bytes
}
}
}
else if (MODE_SENSE == cmd)
{
pgm = P_ModeSense;
blen = 4;
}
else
{
pgm = P_ReadCapacity-3;
blen = 8;
if (READ_CAPACITY != cmd)
status = 1; // Faking a data phase for unknown commands
}
if (pgm)
Transfer(MSC_TX | TRANSFER_PGM | TRANSFER_RELEASE,pgm,blen);
cbw.flags = status;
cbw.transferLength -= blen;
cbw.signature[3] = 'S';
Transfer(MSC_TX | TRANSFER_RELEASE,(u8*)&cbw,13);
}
CBW cbw; // 38 byte savings by making this global
void SCSITask()
{
Recv(MSC_RX,(u8*)&cbw,sizeof(CBW));
SCSI(cbw);
}
#endif
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