USBMSD_Ram.cpp

00001 /* mbed USBMSD_Ram Library
00002  *
00003  * Permission is hereby granted, free of charge, to any person obtaining a copy
00004  * of this software and associated documentation files (the "Software"), to deal
00005  * in the Software without restriction, including without limitation the rights
00006  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00007  * copies of the Software, and to permit persons to whom the Software is
00008  * furnished to do so, subject to the following conditions:
00009  *
00010  * The above copyright notice and this permission notice shall be included in
00011  * all copies or substantial portions of the Software.
00012  *
00013  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00014  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00015  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00016  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00017  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00018  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00019  * THE SOFTWARE.
00020  */
00021 
00022 #include "USBMSD_Ram.h"
00023 
00024 typedef struct sector {
00025     const char * sect;
00026     unsigned int length;
00027 } SECTOR;
00028 
00029 #define LSByte(x) (x & 0xff)
00030 #define MSByte(x) ((x >> 8) & 0xff)
00031 
00032 const char mbr[] = {
00033     //sector 0: boot sector
00034     0xEB,0x3C,0x90,0x4D,0x53,0x44,0x4F,0x53,0x35,0x2E,0x30,    0x00,0x02,/*bytes per sector: 512*/   
00035     0x01, /*sectors per cluster*/ 0x01,0x00,/*number of reserved sector*/
00036     0x01, /* number of FATs*/ 
00037     0x10,0x00, /*Maximum number of root directory entries: 16*/ 
00038     LSByte(NB_SECTORS),MSByte(NB_SECTORS), /*Total sector count*/ 
00039     0xF0,  0x01,0x00,/*sectors per FAT: 1*/  
00040     0x01,0x00,/*Sectors per track*/  
00041     0x01,0x00, /*Number of heads*/  
00042     0x00,0x00,0x00,0x00,
00043     0x00,0x01,0x00,0x00,0x00,0x00,  0x29, /*boot signature*/ 
00044     0x74,0x19,0x02,0x27, /*volume ID*/ 
00045     'M','b','e','d',' ','U','S','B',' ',' ',' ', /*volume label: Mbed USB*/     
00046     0x46,0x41,0x54,0x31,0x32,0x20,0x20,0x20,0x33,0xC9,
00047     0x8E,0xD1,0xBC,0xF0,0x7B,0x8E,0xD9,0xB8,0x00,0x20,0x8E,0xC0,0xFC,0xBD,0x00,0x7C,
00048     0x38,0x4E,0x24,0x7D,0x24,0x8B,0xC1,0x99,0xE8,0x3C,0x01,0x72,0x1C,0x83,0xEB,0x3A,
00049     0x66,0xA1,0x1C,0x7C,0x26,0x66,0x3B,0x07,0x26,0x8A,0x57,0xFC,0x75,0x06,0x80,0xCA,
00050     0x02,0x88,0x56,0x02,0x80,0xC3,0x10,0x73,0xEB,0x33,0xC9,0x8A,0x46,0x10,0x98,0xF7,
00051     0x66,0x16,0x03,0x46,0x1C,0x13,0x56,0x1E,0x03,0x46,0x0E,0x13,0xD1,0x8B,0x76,0x11,
00052     0x60,0x89,0x46,0xFC,0x89,0x56,0xFE,0xB8,0x20,0x00,0xF7,0xE6,0x8B,0x5E,0x0B,0x03,
00053     0xC3,0x48,0xF7,0xF3,0x01,0x46,0xFC,0x11,0x4E,0xFE,0x61,0xBF,0x00,0x00,0xE8,0xE6,
00054     0x00,0x72,0x39,0x26,0x38,0x2D,0x74,0x17,0x60,0xB1,0x0B,0xBE,0xA1,0x7D,0xF3,0xA6,
00055     0x61,0x74,0x32,0x4E,0x74,0x09,0x83,0xC7,0x20,0x3B,0xFB,0x72,0xE6,0xEB,0xDC,0xA0,
00056     0xFB,0x7D,0xB4,0x7D,0x8B,0xF0,0xAC,0x98,0x40,0x74,0x0C,0x48,0x74,0x13,0xB4,0x0E,
00057     0xBB,0x07,0x00,0xCD,0x10,0xEB,0xEF,0xA0,0xFD,0x7D,0xEB,0xE6,0xA0,0xFC,0x7D,0xEB,
00058     0xE1,0xCD,0x16,0xCD,0x19,0x26,0x8B,0x55,0x1A,0x52,0xB0,0x01,0xBB,0x00,0x00,0xE8,
00059     0x3B,0x00,0x72,0xE8,0x5B,0x8A,0x56,0x24,0xBE,0x0B,0x7C,0x8B,0xFC,0xC7,0x46,0xF0,
00060     0x3D,0x7D,0xC7,0x46,0xF4,0x29,0x7D,0x8C,0xD9,0x89,0x4E,0xF2,0x89,0x4E,0xF6,0xC6,
00061     0x06,0x96,0x7D,0xCB,0xEA,0x03,0x00,0x00,0x20,0x0F,0xB6,0xC8,0x66,0x8B,0x46,0xF8,
00062     0x66,0x03,0x46,0x1C,0x66,0x8B,0xD0,0x66,0xC1,0xEA,0x10,0xEB,0x5E,0x0F,0xB6,0xC8,
00063     0x4A,0x4A,0x8A,0x46,0x0D,0x32,0xE4,0xF7,0xE2,0x03,0x46,0xFC,0x13,0x56,0xFE,0xEB,
00064     0x4A,0x52,0x50,0x06,0x53,0x6A,0x01,0x6A,0x10,0x91,0x8B,0x46,0x18,0x96,0x92,0x33,
00065     0xD2,0xF7,0xF6,0x91,0xF7,0xF6,0x42,0x87,0xCA,0xF7,0x76,0x1A,0x8A,0xF2,0x8A,0xE8,
00066     0xC0,0xCC,0x02,0x0A,0xCC,0xB8,0x01,0x02,0x80,0x7E,0x02,0x0E,0x75,0x04,0xB4,0x42,
00067     0x8B,0xF4,0x8A,0x56,0x24,0xCD,0x13,0x61,0x61,0x72,0x0B,0x40,0x75,0x01,0x42,0x03,
00068     0x5E,0x0B,0x49,0x75,0x06,0xF8,0xC3,0x41,0xBB,0x00,0x00,0x60,0x66,0x6A,0x00,0xEB,
00069     0xB0,0x4E,0x54,0x4C,0x44,0x52,0x20,0x20,0x20,0x20,0x20,0x20,0x0D,0x0A,0x52,0x65,
00070     0x6D,0x6F,0x76,0x65,0x20,0x64,0x69,0x73,0x6B,0x73,0x20,0x6F,0x72,0x20,0x6F,0x74,
00071     0x68,0x65,0x72,0x20,0x6D,0x65,0x64,0x69,0x61,0x2E,0xFF,0x0D,0x0A,0x44,0x69,0x73,
00072     0x6B,0x20,0x65,0x72,0x72,0x6F,0x72,0xFF,0x0D,0x0A,0x50,0x72,0x65,0x73,0x73,0x20,
00073     0x61,0x6E,0x79,0x20,0x6B,0x65,0x79,0x20,0x74,0x6F,0x20,0x72,0x65,0x73,0x74,0x61,
00074     0x72,0x74,0x0D,0x0A,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xAC,0xCB,0xD8,0x55,0xAA,
00075 };
00076 
00077 const char fat[] = { 0xF8,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x0F };
00078 
00079 const char root_dir[] = {
00080     //sector 3: root directory
00081     //entry 1
00082     'M','b','e','d',' ','U','S','B',' ',' ',' ',   0x28,0x00,0x00,0x00,0x00,
00083     0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
00084     //entry 2
00085     'R','E','A','D','M','E',0x20,0x20,'T','X','T', /*readme.txt*/ 0x20,0x00,0x00,0x00,0x00,
00086     0x21,0x00,0xBB,0x32,0x00,0x00,   0xDC,0x83,/*hour/min/doublesec*/  0x6A,0x3F,/*year/month/day*/  0x02,0x00, /*starting cluster*/ 0x1e,0x00,0x00,0x00, /*size*/
00087 };
00088 
00089 const char data[] = {
00090     //sector 4: data
00091     'H','e','l','l','o',' ','f','r','o','m',' ','M','b','e','d','!',
00092     '\r','\n','U','S','B',' ','M','S','D',' ','d','e','m','o',0x00,0x00
00093 };
00094 
00095 //3 sectors
00096 SECTOR sectors[4] = {
00097     {mbr , 512},
00098     {fat, 8},
00099     {root_dir, 4*16},
00100 
00101     // contains readme.txt
00102     {data, 2*16}
00103 };
00104 
00105 USBMSD_Ram::USBMSD_Ram()  {
00106     //no init
00107     _status = 0x01;
00108     memset(disk_image, 0, 512*4);
00109     for (uint8_t i = 0; i < 4; i++) {
00110         memcpy(disk_image + 512*i, sectors[i].sect, sectors[i].length);
00111     }
00112     connect();
00113 }
00114 
00115 int USBMSD_Ram::disk_initialize() {
00116     // OK
00117     _status = 0x00;
00118     return 0;
00119 }
00120 
00121 int USBMSD_Ram::disk_write(const uint8_t * buffer, uint64_t block_number, uint8_t count) { 
00122     memcpy(disk_image + block_number*512, buffer, 512*count);
00123     return 0;    
00124 }
00125 
00126 int USBMSD_Ram::disk_read(uint8_t * buffer, uint64_t block_number, uint8_t count) {
00127     memcpy(buffer, disk_image + block_number*512, 512*count);
00128     return 0;
00129 }
00130 
00131 int USBMSD_Ram::disk_status() { return _status; }
00132 int USBMSD_Ram::disk_sync() { return 0; }
00133 uint64_t USBMSD_Ram::disk_sectors() { return NB_SECTORS; }
00134 uint64_t USBMSD_Ram::disk_size() { return NB_SECTORS*512;}