1 | void FlashRead(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command,
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2 | u8 *WriteBfrPtr, u8 *ReadBfrPtr)
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3 | {
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4 | u32 RealAddr;
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5 | u32 RealByteCnt;
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6 | u32 BankSel;
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7 | u32 BufferIndex;
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8 | u32 TotalByteCnt;
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9 | u8 ShiftSize;
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10 |
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11 | /*
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12 | * Retain the actual byte count
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13 | */
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14 | TotalByteCnt = ByteCount;
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15 |
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16 | while(((signed long)(ByteCount)) > 0) {
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17 |
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18 | /*
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19 | * Translate address based on type of connection
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20 | * If stacked assert the slave select based on address
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21 | */
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22 | RealAddr = GetRealAddr(QspiPtr, Address);
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23 |
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24 | /*
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25 | * Select bank
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26 | */
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27 | if(Flash_Config_Table[FCTIndex].FlashDeviceSize > SIXTEENMB) {
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28 | BankSel = RealAddr/SIXTEENMB;
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29 | SendBankSelect(QspiPtr, WriteBfrPtr, BankSel);
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30 | }
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31 |
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32 | /*
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33 | * If data to be read spans beyond the current bank, then
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34 | * calculate RealByteCnt in current bank. Else
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35 | * RealByteCnt is the same as ByteCount
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36 | */
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37 | if((Address & BANKMASK) != ((Address+ByteCount) & BANKMASK)) {
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38 | RealByteCnt = (Address & BANKMASK) + SIXTEENMB - Address;
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39 | }else {
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40 | RealByteCnt = ByteCount;
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41 | }
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42 |
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43 |
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44 | /*
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45 | * Setup the write command with the specified address and data for the
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46 | * Flash
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47 | */
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48 | WriteBfrPtr[COMMAND_OFFSET] = Command;
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49 | WriteBfrPtr[ADDRESS_1_OFFSET] = (u8)((RealAddr & 0xFF0000) >> 16);
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50 | WriteBfrPtr[ADDRESS_2_OFFSET] = (u8)((RealAddr & 0xFF00) >> 8);
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51 | WriteBfrPtr[ADDRESS_3_OFFSET] = (u8)(RealAddr & 0xFF);
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52 |
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53 | if ((Command == FAST_READ_CMD) || (Command == DUAL_READ_CMD) ||
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54 | (Command == QUAD_READ_CMD)) {
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55 | RealByteCnt += DUMMY_SIZE;
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56 | }
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57 | /*
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58 | * Send the read command to the Flash to read the specified number
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59 | * of bytes from the Flash, send the read command and address and
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60 | * receive the specified number of bytes of data in the data buffer
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61 | */
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62 | XQspiPs_PolledTransfer(QspiPtr, WriteBfrPtr,
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63 | &(ReadBfrPtr[TotalByteCnt - ByteCount]),
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64 | RealByteCnt + OVERHEAD_SIZE);
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65 |
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66 | /*
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67 | * To discard the first 5 dummy bytes, shift the data in read buffer
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68 | */
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69 | if((Command == FAST_READ_CMD) || (Command == DUAL_READ_CMD) ||
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70 | (Command == QUAD_READ_CMD)){
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71 | ShiftSize = OVERHEAD_SIZE + DUMMY_SIZE;
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72 | }else{
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73 | ShiftSize = OVERHEAD_SIZE;
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74 | }
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75 |
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76 | for(BufferIndex = (TotalByteCnt - ByteCount);
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77 | BufferIndex < (TotalByteCnt - ByteCount) + RealByteCnt;
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78 | BufferIndex++) {
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79 | ReadBfrPtr[BufferIndex] = ReadBfrPtr[BufferIndex + ShiftSize];
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80 | }
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81 |
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82 | /*
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83 | * Increase address to next bank
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84 | */
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85 | Address = (Address & BANKMASK) + SIXTEENMB;
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86 | /*
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87 | * Decrease byte count by bytes already read.
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88 | */
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89 | if ((Command == FAST_READ_CMD) || (Command == DUAL_READ_CMD) ||
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90 | (Command == QUAD_READ_CMD)) {
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91 | ByteCount = ByteCount - (RealByteCnt - DUMMY_SIZE);
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92 | }else {
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93 | ByteCount = ByteCount - RealByteCnt;
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94 | }
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95 |
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96 | }
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97 |
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98 | }
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