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comparison cp2102/read_partno.c @ 50:a5c4a82d01ab

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cp2102-read-partno program written, compiles
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 11 Sep 2023 17:41:24 +0000
parents
children 9a15eb300ab0
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49:9ca4f9fa415b 50:a5c4a82d01ab
1 /*
2 * This program locates a presumed-CP2102 device via libusb and reads its
3 * vendor-specific part number register, seeking to distinguish between
4 * the original CP2102 and the later CP2102N.
5 */
6
7 #include <sys/types.h>
8 #include <string.h>
9 #include <strings.h>
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <unistd.h>
13 #include <usb.h>
14 #include "../libuwrap/find_dev.h"
15 #include "cp210x_defs.h"
16
17 main(argc, argv)
18 char **argv;
19 {
20 struct usb_device *dev;
21 usb_dev_handle *usbh;
22 u_char partno;
23 int rc;
24
25 if (argc != 2) {
26 fprintf(stderr, "usage: %s device-selector\n", argv[0]);
27 exit(1);
28 }
29 dev = find_usbdev_by_desc_string(argv[1]);
30 if (!dev) {
31 fprintf(stderr, "error: specified USB device not found\n");
32 exit(1);
33 }
34 usbh = usb_open(dev);
35 if (!usbh) {
36 fprintf(stderr, "error: usb_open() failed\n");
37 exit(1);
38 }
39 rc = usb_control_msg(usbh, DEVICE_IN_REQTYPE, CP210x_CONFIG, 0,
40 REG_PART_NUMBER, (char *) &partno, 1,
41 USB_READ_TIMEOUT);
42 if (rc != 1) {
43 fprintf(stderr,
44 "REG_PART_NUMBER read error: usb_control_msg() returned %d\n",
45 rc);
46 exit(1);
47 }
48 usb_close(usbh);
49 printf("0x%02X\n", partno);
50 exit(0);
51 }