emUSB USB_MSD_StorageRAM nicht vorhanden

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  • emUSB USB_MSD_StorageRAM nicht vorhanden

    Hello everybody,

    I try to use emUSB and want to implement an easy MSD using RAM on an TMPA900CM. I have a lot of problems to get the code to this point because the documentation of the emXXX packages is very imprecise.
    The problem is that I don't find USB_MSD_StorageRAM in the Library. We only purchased the object code variant and not the source code variant of emUSB and I think there USB_MSD_StorageRAM is not included. I tried to implement this very easy RAM API myself but the documentation of USB_MSD_STORAGE_API is not enough for me to understand what the functions have to do. Could anybody help with a detailed description of what the function have to do?

    C Source Code

    1. // USB_MSD_RAM Implementation
    3. #include "USB.h"
    4. #include "USB_MSD.h"
    6. U8 RAMLun;
    7. U8* RAM;
    8. U32 RAMSize;
    9. U32 RAMNumSectors;
    10. U32 RAMSectorSize;
    12. U8* RAMReadBuffer;
    13. U8* RAMWriteBuffer;
    15. U32 RAMSectorIndex;
    17. void _pfInit(U8 Lun, const USB_MSD_INST_DATA_DRIVER * pDriverData)
    18. {
    19. RAMLun = Lun;
    20. RAM = pDriverData->pStart;
    21. RAMSize = pDriverData->NumSectors * pDriverData->SectorSize;
    22. RAMSectorSize = pDriverData->SectorSize;
    23. RAMNumSectors = pDriverData->NumSectors;
    24. return;
    25. }
    27. void _pfGetInfo(U8 Lun, USB_MSD_INFO * pInfo)
    28. {
    29. if(Lun == RAMLun)
    30. {
    31. pInfo->NumSectors = RAMNumSectors;
    32. pInfo->SectorSize = RAMSectorSize;
    33. }
    34. return;
    35. }
    37. U32 _pfGetReadBuffer(U8 Lun, U32 SectorIndex, void ** ppData, U32 NumSectors)
    38. {
    39. if(RAMNumSectors < (SectorIndex+NumSectors))
    40. return 0;
    41. ppData[0] = RAM+(SectorIndex*RAMSectorSize);
    42. return NumSectors;
    43. }
    45. char _pfRead(U8 Lun, U32 SectorIndex, void * pData, U32 NumSector)
    46. {
    47. if(Lun == RAMLun)
    48. {
    49. if(SectorIndex > RAMNumSectors)
    50. return 1;
    51. for(int i=NumSector; i > 0; i--)
    52. {
    53. if((SectorIndex + (NumSector-i)) > RAMNumSectors)
    54. return 1;
    55. else
    56. memset((U8*)(pData)+((SectorIndex + (NumSector - i)) * RAMSectorSize), (U8)(RAM[((SectorIndex + (NumSector - i)) * RAMSectorSize)]), 1);
    57. }
    58. return 0;
    59. }
    60. return 1; // Success
    61. }
    63. U32 _pfGetWriteBuffer(U8 Lun, U32 SectorIndex, void ** ppData, U32 NumSectors)
    64. {
    65. if(RAMNumSectors < NumSectors)
    66. return 0;
    67. ppData[0] = RAM+(SectorIndex*RAMSectorSize);
    68. return NumSectors;
    69. }
    71. char _pfWrite(U8 Lun, U32 SectorIndex, const void * pData, U32 NumSectors)
    72. {
    73. if(Lun == RAMLun)
    74. {
    75. if(SectorIndex > RAMNumSectors)
    76. return 1;
    77. for(int i=NumSectors; i > 0; i--)
    78. {
    79. if((SectorIndex + (NumSectors-i)) > RAMNumSectors)
    80. return 1;
    81. else
    82. memset(RAM+((SectorIndex + (NumSectors-i))*RAMSectorSize), *((U8*)(pData)), 1);
    83. }
    84. return 0;
    85. }
    86. return 1; // Success
    87. }
    89. char _pfMediumIsPresent(U8 Lun)
    90. {
    91. if(Lun == RAMLun)
    92. return 1;
    93. else return 0;
    94. }
    96. void _pfDeInit(U8 Lun)
    97. {
    98. return;
    99. }
    101. const USB_MSD_STORAGE_API USB_MSD_StorageRAM = {
    102. _pfInit,
    103. _pfGetInfo,
    104. _pfGetReadBuffer,
    105. _pfRead,
    106. _pfGetWriteBuffer,
    107. _pfWrite,
    108. _pfMediumIsPresent,
    109. 0
    110. };
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    P.S: For everybody who has problems in getting the USB Device Driver running. Don't forget to activate clocks on USB. The driver doesn't do it.

    Any help is appreciated.
    lowlevel