1 | // Altera requires configuration bytes to be sent LSB first but the |
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2 | // SD Card reads bytes MSB first |
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3 | // This code reverses the bits of the altera bitstream so |
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4 | // it will come out correct when read from the SD card |
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5 | // $Log: bit_reverse.c,v $ |
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6 | // Revision 1.1 2006/01/06 14:44:17 mbl |
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7 | // initial version |
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8 | // |
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9 | |
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10 | |
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11 | |
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12 | #include "stdio.h" |
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13 | #include "string.h" |
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14 | |
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15 | FILE* fileOut; |
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16 | FILE* fileIn; |
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17 | |
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18 | void outIOerror(char* pfn); |
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19 | void inIOerror(char* pfn); |
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20 | |
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21 | int main(int argc, char* arg[]) |
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22 | { |
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23 | unsigned char input, output; |
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24 | unsigned char in_mask, out_mask; |
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25 | int i; |
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26 | |
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27 | fileOut = fopen(arg[2],"wb"); |
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28 | if (fileOut == NULL) |
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29 | { |
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30 | outIOerror(arg[2]); |
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31 | exit(-1); |
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32 | } |
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33 | |
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34 | printf("Opening input file %s\n", arg[1]); |
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35 | fileIn = fopen(arg[1],"rb"); |
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36 | if (fileIn == NULL) |
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37 | { |
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38 | inIOerror(arg[1]); |
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39 | exit(-1); |
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40 | } |
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41 | |
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42 | while (!feof(fileIn) && fgets((char*)&input, 2 ,fileIn) != NULL) |
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43 | { |
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44 | in_mask = 1; |
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45 | out_mask = 0x80; |
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46 | output = 0; |
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47 | |
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48 | for ( i=0; i < 8; ++i ) |
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49 | { |
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50 | if (input & in_mask) |
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51 | { |
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52 | output |= out_mask; |
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53 | } |
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54 | out_mask = out_mask >> 1; |
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55 | in_mask = in_mask << 1; |
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56 | } |
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57 | fwrite((void*)&output,sizeof(char),1,fileOut); |
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58 | } |
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59 | |
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60 | fclose(fileIn); |
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61 | fclose(fileOut); |
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62 | printf("\n%s has been created\n", arg[2]); |
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63 | exit(0); |
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64 | } |
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65 | |
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66 | void outIOerror(char *pfn) |
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67 | { |
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68 | printf("I/O Error while writing to file=%s\n",pfn); |
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69 | } |
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70 | |
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71 | void inIOerror(char *pfn) |
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72 | { |
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73 | printf("I/O Error while reading file=%s\n",pfn); |
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74 | } |
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