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annotate cp2102/update_eeprom.c @ 101:ba741a1af0e3

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doc/CP2102-EEPROM-tools: article started
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 06:35:39 +0000
parents c59011177e2e
children
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1 /*
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2 * This program locates a CP2102 device via libusb, reads its internal EEPROM,
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3 * applies user-requested patches to the EEPROM image, and then reprograms
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4 * the physical EEPROM with the patched version.
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5 */
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6
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7 #include <sys/types.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13 #include <usb.h>
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14 #include "../libuwrap/find_dev.h"
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15 #include "../libuwrap/open_close.h"
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16 #include "cp210x_defs.h"
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17
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18 extern struct usb_device *find_cp2102_device();
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19
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20 u_char eeprom[SIZE_EEPROM];
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21 char *device_selector, *baud_change;
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22 int no_detach;
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23
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24 process_cmdline(argc, argv)
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25 char **argv;
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26 {
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27 int c;
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28 extern int optind;
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29 extern char *optarg;
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30
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31 while ((c = getopt(argc, argv, "b:d:n")) != EOF) {
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32 switch (c) {
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33 case 'b':
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34 baud_change = optarg;
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35 continue;
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36 case 'd':
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37 device_selector = optarg;
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38 continue;
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39 case 'n':
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40 no_detach = 1;
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41 continue;
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42 default:
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43 usage:
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44 fprintf(stderr,
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45 "usage: %s [hw-options] eeprom-changes\n",
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46 argv[0]);
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47 exit(1);
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48 }
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49 }
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50 if (argc == optind && !baud_change)
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51 goto usage;
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52 }
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53
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54 main(argc, argv)
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55 char **argv;
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56 {
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57 struct usb_device *dev;
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58 usb_dev_handle *usbh;
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59 extern int optind;
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61 process_cmdline(argc, argv);
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62 dev = find_cp2102_device(device_selector);
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63 usbh = usb_open(dev);
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64 if (!usbh) {
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65 fprintf(stderr, "error: usb_open() failed\n");
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66 exit(1);
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67 }
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68 read_eeprom(usbh);
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69 if (baud_change)
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70 apply_eeprom_patch_baud(baud_change);
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71 for (; optind < argc; optind++)
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72 apply_eeprom_patch_file(argv[optind]);
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73 if (!no_detach)
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74 usbwrap_claim_all_ifs(usbh);
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75 write_eeprom(usbh);
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76 usb_close(usbh);
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77 exit(0);
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78 }