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annotate cp2102/read_partno.c @ 107:bc3367755586 default tip

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author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 21 Nov 2023 22:11:09 +0000
parents 1cacc1ae56f0
children
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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 extern struct usb_device *find_cp2102_device();
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18 char *device_selector;
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19
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20 process_cmdline(argc, argv)
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21 char **argv;
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22 {
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23 int c;
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24 extern int optind;
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25 extern char *optarg;
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26
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27 while ((c = getopt(argc, argv, "d:")) != EOF) {
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28 switch (c) {
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29 case 'd':
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30 device_selector = optarg;
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31 continue;
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32 default:
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33 usage:
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34 fprintf(stderr, "usage: %s [-d device-selector]\n",
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35 argv[0]);
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36 exit(1);
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37 }
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38 }
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39 if (argc != optind)
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40 goto usage;
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41 }
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42
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43 main(argc, argv)
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44 char **argv;
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45 {
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46 struct usb_device *dev;
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47 usb_dev_handle *usbh;
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48 u_char partno;
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49 int rc;
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50
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51 process_cmdline(argc, argv);
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52 dev = find_cp2102_device(device_selector);
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53 usbh = usb_open(dev);
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54 if (!usbh) {
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55 fprintf(stderr, "error: usb_open() failed\n");
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56 exit(1);
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57 }
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58 rc = usb_control_msg(usbh, DEVICE_IN_REQTYPE, CP210x_CONFIG,
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59 REG_PART_NUMBER, 0, (char *) &partno, 1,
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60 USB_READ_TIMEOUT);
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61 if (rc != 1) {
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62 fprintf(stderr,
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63 "REG_PART_NUMBER read error: usb_control_msg() returned %d\n",
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64 rc);
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65 exit(1);
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66 }
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67 usb_close(usbh);
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68 printf("0x%02X\n", partno);
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69 exit(0);
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70 }