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annotate cp2102/read_partno.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 9a15eb300ab0
children 8d35346f1d46
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a5c4a82d01ab cp2102-read-partno program written, compiles
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1 /*
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2 * This program locates a presumed-CP2102 device via libusb and reads its
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3 * vendor-specific part number register, seeking to distinguish between
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4 * the original CP2102 and the later CP2102N.
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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 "cp210x_defs.h"
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16
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17 main(argc, argv)
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18 char **argv;
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19 {
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20 struct usb_device *dev;
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21 usb_dev_handle *usbh;
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22 u_char partno;
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23 int rc;
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24
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25 if (argc != 2) {
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26 fprintf(stderr, "usage: %s device-selector\n", argv[0]);
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27 exit(1);
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28 }
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29 dev = find_usbdev_by_desc_string(argv[1]);
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30 if (!dev) {
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31 fprintf(stderr, "error: specified USB device not found\n");
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32 exit(1);
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33 }
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34 usbh = usb_open(dev);
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35 if (!usbh) {
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36 fprintf(stderr, "error: usb_open() failed\n");
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37 exit(1);
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38 }
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39 rc = usb_control_msg(usbh, DEVICE_IN_REQTYPE, CP210x_CONFIG,
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40 REG_PART_NUMBER, 0, (char *) &partno, 1,
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41 USB_READ_TIMEOUT);
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42 if (rc != 1) {
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43 fprintf(stderr,
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44 "REG_PART_NUMBER read error: usb_control_msg() returned %d\n",
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45 rc);
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46 exit(1);
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47 }
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48 usb_close(usbh);
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49 printf("0x%02X\n", partno);
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50 exit(0);
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51 }