1 | void find_highest_song_number(void){
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2 | int32 clust_high;
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3 | int32 eocmark;
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4 | root_ccl= BPB_RootClus;
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5 | clust_high=0;
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6 | do{
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7 | root_p_cl=root_ccl;
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8 | root_ccl=readfat(root_p_cl);
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9 | // printf("cluster seek:%4LX ",root_ccl);
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10 | eocmark=root_ccl & 0x0FFFFFFF;
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11 | clust_high++;
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12 | }while(eocmark<0x0fffffef);
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13 | highestsong=clust_high * BPB_SecPerClus;
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14 | highestsong= highestsong*16;
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15 | highestsong--;
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16 | }
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17 |
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18 |
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19 | int32 readfat(int32 fatoffset){
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20 | int16 temp;
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21 | int32 tempb;
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22 | char los;
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23 |
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24 | temp=0;
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25 | fatoffset=fatoffset*2;
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26 | los = *(((char*)&fatoffset)+0); //the bottom byte of the address goes directly to a word in the FAT
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27 | fatoffset=fatoffset / 256;
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28 | fatoffset+=fatstart;
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29 | if(mmc_open_block(fatoffset)==1){
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30 | putc('^');
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31 | // printf("fat retry...");
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32 | if(mmc_open_block(fatoffset)==1){
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33 | putc('&');
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34 | mmc_init(0);
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35 | // printf("fat RETRY...");
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36 | if(mmc_open_block(fatoffset)==1){
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37 | putc('*');
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38 | mmc_init(0);
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39 | // printf("fat LOOKS BAD...");
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40 | if(mmc_open_block(fatoffset)==1){
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41 | printf("problem reading fat table, quitting chain. Sorry!");
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42 | return 0xffffffff;
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43 | songkill=1;
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44 | }
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45 | }
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46 | }
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47 | }
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48 | mmc_skip(los);
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49 | mmc_read();
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50 | temp = ((int16) data_hi * 256)+ (int16) data_lo;
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51 | mmc_read();//for fat32, four bytes per entry
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52 | tempb=0;
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53 | tempb = ((int16) data_hi * 256)+ (int16) data_lo;
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54 | tempb=tempb<<16;
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55 | tempb=tempb+(int32) temp;
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56 | mmc_skip(255-(los));//trouble???
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57 | mmc_read();
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58 | mmc_read();
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59 | mmc_close_block();
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60 | return tempb;
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61 | }
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62 |
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63 |
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64 | char mmc_open_block(int32 block_number){
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65 | char tries,i;
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66 | int32 block_number_temp;
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67 |
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68 | for(tries=0;tries<10;tries++){
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69 | SSPCON1=throttle;
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70 | block_number_temp=block_number*512;
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71 | // PUTC(13);PUTC(10);
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72 | // printf("opening boolach");
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73 | // printf("try:%u",tries);
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74 | SPI_WRITE(0xFF);
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75 | SPI_WRITE(0xFF);
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76 | MMCSS=0; // set MMCSS = 0 (on)
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77 | // SPI_WRITE(0xFF);
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78 | // SPI_WRITE(0xFF);
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79 | SPI_WRITE(0x51); // send mmc read single block command
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80 | SPI_WRITE(*(((char*)&block_number_temp)+3)); // arguments are address
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81 | SPI_WRITE(*(((char*)&block_number_temp)+2));
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82 | SPI_WRITE(*(((char*)&block_number_temp)+1));
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83 | SPI_WRITE(0x00);
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84 | SPI_WRITE(0xFF); // checksum is no longer required but we always send 0xFF
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85 | if((mmc_response(0x00))==0){//((mmc_response(0x00))==0){
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86 | if((mmc_response(0xFE))==0){
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87 | return(0);
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88 | }
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89 | // printf("NOFENOFE");
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90 | for(i=0;i<255;i++){
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91 | SPI_WRITE(0xFF);
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92 | SPI_WRITE(0xFF);
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93 | }
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94 | }
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95 | MMCSS=1; // set MMCSS = 1 (off)
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96 | SPI_WRITE(0xFF);// give mmc the clocks it needs to finish off
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97 | SPI_WRITE(0xFF);// give mmc the clocks it needs to finish off
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98 | // SPI_WRITE(0xFF);// give mmc the clocks it needs to finish off
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99 | // SPI_WRITE(0xFF);// give mmc the clocks it needs to finish off
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100 |
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101 | // printf("minorcrash%d",tries);
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102 | // if((throttle==mmc_high_speed)&(tries>3)){throttle=mmc_med_speed; printf("now med speed");}
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103 | // else if((throttle==mmc_med_speed)&(tries>5)){throttle=mmc_low_speed; printf("now low speed");}
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104 | // mmc_init(0);
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105 | }
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106 | // puts("MMC crash in: mmc open block.\n\r");
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107 | return 1;
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108 | }
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109 |
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110 | void mmc_close_block(void){
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111 | //printf("close block");
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112 | SPI_READ(0xFF); // CRC bytes that are not needed
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113 | SPI_READ(0xFF);
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114 | MMCSS=1; // set MMCSS = 1 (off)
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115 | SPI_WRITE(0xFF); // give mmc the clocks it needs to finish off
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116 | SPI_WRITE(0xff);
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117 | // SPI_WRITE(0xff);
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118 | // SPI_WRITE(0xff);
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119 | }
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120 |
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121 | void mmc_skip(char count){
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122 | for (;count>0;count--){
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123 | SPI_WRITE(0xFF);
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124 | SPI_WRITE(0xFF);
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125 | }
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126 | }
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