FreeCalypso > hg > fc-usbser-tools

annotate cp2102/decode_usb_desc.c @ 87:4393e1b4b245

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cp2102-decode-ee-desc: decode config descriptor
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 19:15:29 +0000
parents b7397959ae68
children ea7b411aad27
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1 /*
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2 * This program reads a CP2102 EEPROM image from an Intel HEX file
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3 * and decodes the USB descriptors portion thereof.
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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 "cp210x_defs.h"
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10
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11 u_char eeprom[SIZE_EEPROM];
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12
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13 static void
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14 print_device_desc(desc)
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15 u_char *desc;
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16 {
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17 printf(" bLength: %u", desc[0]);
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18 if (desc[0] != 18)
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19 fputs(" (WRONG!)", stdout);
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20 putchar('\n');
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21 printf(" bDescriptorType: 0x%02X", desc[1]);
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22 if (desc[1] != 0x01)
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23 fputs(" (WRONG!)", stdout);
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24 putchar('\n');
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25 printf(" bcdUSB: 0x%02X%02X\n", desc[3], desc[2]);
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26 printf(" bDeviceClass: 0x%02X\n", desc[4]);
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27 printf(" bDeviceSubClass: 0x%02X\n", desc[5]);
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28 printf(" bDeviceProtocol: 0x%02X\n", desc[6]);
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29 printf(" bMaxPacketSize0: %u\n", desc[7]);
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30 printf(" idVendor: 0x%02X%02X\n", desc[9], desc[8]);
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31 printf(" idProduct: 0x%02X%02X\n", desc[11], desc[10]);
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32 printf(" bcdDevice: 0x%02X%02X\n", desc[13], desc[12]);
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33 printf(" iManufacturer: %u\n", desc[14]);
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34 printf(" iProduct: %u\n", desc[15]);
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35 printf(" iSerialNumber: %u\n", desc[16]);
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36 printf(" bNumConfigurations: %u\n", desc[17]);
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37 }
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38
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39 static void
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40 print_config_desc(desc)
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41 u_char *desc;
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42 {
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43 printf(" bLength: %u", desc[0]);
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44 if (desc[0] != 9)
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45 fputs(" (WRONG!)", stdout);
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46 putchar('\n');
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47 printf(" bDescriptorType: 0x%02X", desc[1]);
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48 if (desc[1] != 0x02)
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49 fputs(" (WRONG!)", stdout);
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50 putchar('\n');
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51 printf(" wTotalLength: %u\n", desc[2] | (desc[3] << 8));
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52 printf(" bNumInterfaces: %u\n", desc[4]);
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53 printf(" bConfigurationValue: 0x%02X\n", desc[5]);
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54 printf(" iConfiguration: %u\n", desc[6]);
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55 printf(" bmAttributes: 0x%02X\n", desc[7]);
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56 printf(" bMaxPower: 0x%02X (%u mA)\n", desc[8], desc[8] * 2);
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57 }
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58
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59 main(argc, argv)
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60 char **argv;
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61 {
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62 if (argc != 2) {
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63 fprintf(stderr, "usage: %s ihex-file\n", argv[0]);
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64 exit(1);
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65 }
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66 read_intel_hex(argv[1]);
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67 printf("USB device descriptor at 0x3988:\n");
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68 print_device_desc(eeprom + 0x388);
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69 printf("USB configuration descriptor at 0x399A:\n");
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70 print_config_desc(eeprom + 0x39A);
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71 /* decoding of other descriptors remains to be implemented */
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72 exit(0);
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73 }