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annotate fteeprom/ftee-fix-cksum.c @ 69:065f68a94b6b

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doc/FTDI-EEPROM-format: beginning of article
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 14 Sep 2023 23:56:25 +0000
parents 85256d5aa559
children
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1 /*
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2 * Sometimes it is useful to be able to edit FTDI EEPROM hex images
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3 * by hand, for special situations and experiments that are too unique
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4 * to automate. However, the need for passing checksum gets in the way.
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5 * This program reads an FTDI EEPROM image from a file (or from stdin),
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6 * recomputes a new checksum and re-emits the checksum-fixed EEPROM hex
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7 * image on stdout.
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8 */
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9
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10 #include <sys/types.h>
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11 #include <string.h>
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12 #include <strings.h>
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13 #include <stdio.h>
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14 #include <stdlib.h>
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15
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16 extern unsigned eeprom_size;
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17 extern u_short eeprom[256];
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18
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19 static unsigned chksum_size;
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20
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21 static void
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22 do_checksum()
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23 {
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24 u_short chksum = 0xAAAA;
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25 unsigned n;
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26
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27 for (n = 0; n < chksum_size - 1; n++) {
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28 chksum ^= eeprom[n];
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29 chksum = (chksum << 1) | (chksum >> 15);
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30 }
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31 eeprom[n] = chksum;
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32 }
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33
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34 static void
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35 emit_output()
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36 {
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37 unsigned n, col;
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38
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39 for (n = 0; n < eeprom_size; n++) {
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40 col = n & 7;
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41 if (col == 0)
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42 printf("%02X:", n * 2);
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43 printf(" %04X", eeprom[n]);
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44 if (col == 7)
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45 putchar('\n');
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46 }
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47 }
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48
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49 main(argc, argv)
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50 char **argv;
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51 {
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52 if (argc != 2) {
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53 fprintf(stderr, "usage: %s eeprom-image-file\n", argv[0]);
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54 exit(1);
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55 }
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56 if (strcmp(argv[1], "-"))
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57 read_eeprom_from_file(argv[1]);
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58 else
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59 read_eeprom_from_stdin();
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60 switch (eeprom_size) {
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61 case 64:
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62 chksum_size = 64;
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63 break;
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64 case 128:
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65 case 256:
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66 chksum_size = 128;
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67 break;
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68 default:
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69 fprintf(stderr,
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70 "BUG: invalid EEPROM size not caught earlier\n");
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71 exit(1);
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72 }
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73 do_checksum();
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74 emit_output();
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75 exit(0);
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76 }