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annotate cp2102/read_partno.c @ 97:8d35346f1d46

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cp2102 tools: accept "default" as device-selector
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 28 Sep 2023 03:26:11 +0000
parents 9a15eb300ab0
children 1cacc1ae56f0
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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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8d35346f1d46 cp2102 tools: accept "default" as device-selector
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17 extern struct usb_device *find_cp2102_device();
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18
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19 main(argc, argv)
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20 char **argv;
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21 {
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22 struct usb_device *dev;
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23 usb_dev_handle *usbh;
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24 u_char partno;
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25 int rc;
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26
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27 if (argc != 2) {
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28 fprintf(stderr, "usage: %s device-selector\n", argv[0]);
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29 exit(1);
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30 }
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31 dev = find_cp2102_device(argv[1]);
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32 usbh = usb_open(dev);
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33 if (!usbh) {
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34 fprintf(stderr, "error: usb_open() failed\n");
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35 exit(1);
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36 }
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37 rc = usb_control_msg(usbh, DEVICE_IN_REQTYPE, CP210x_CONFIG,
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38 REG_PART_NUMBER, 0, (char *) &partno, 1,
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39 USB_READ_TIMEOUT);
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40 if (rc != 1) {
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41 fprintf(stderr,
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42 "REG_PART_NUMBER read error: usb_control_msg() returned %d\n",
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43 rc);
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44 exit(1);
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45 }
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46 usb_close(usbh);
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47 printf("0x%02X\n", partno);
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48 exit(0);
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49 }