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annotate duart28/eeprom_wr.c @ 84:b36397a56bda

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doc/CP2102-EEPROM-format: small error in analysis
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 18:38:10 +0000
parents 530ec3792de8
children
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1 /*
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2 * This module implements the final step of modifying the EEPROM
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3 * for the desired configuration.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <string.h>
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10 #include <strings.h>
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11 #include <usb.h>
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12 #include "../libftmini/eeprom_func.h"
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14 extern u_short eeprom[64];
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16 static void
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17 recompute_checksum()
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18 {
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19 u_short chksum = 0xAAAA;
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20 unsigned n;
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22 for (n = 0; n < 63; n++) {
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23 chksum ^= eeprom[n];
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24 chksum = (chksum << 1) | (chksum >> 15);
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25 }
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26 eeprom[63] = chksum;
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27 }
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29 void
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30 update_eeprom(usbh, newconf)
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31 usb_dev_handle *usbh;
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32 {
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33 switch (newconf) {
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34 case 'C':
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35 eeprom[2] = 0x7152;
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36 break;
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37 case 'S':
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38 eeprom[2] = 0x6010;
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39 break;
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40 default:
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41 fprintf(stderr, "BUG: wrong argument to update_eeprom()\n");
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42 abort();
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43 }
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44 eeprom[31] = newconf;
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45 recompute_checksum();
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46 ftmini_write_eeprom_loc(usbh, 2, eeprom[2]);
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47 ftmini_write_eeprom_loc(usbh, 31, eeprom[31]);
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48 ftmini_write_eeprom_loc(usbh, 63, eeprom[63]);
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49 }