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comparison libftmini/ft232r_magic.c @ 22:4e5c8ac4d508

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libftmini: add function for FT232R magic
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 09 Sep 2023 01:06:43 +0000
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21:af801ab43a33 22:4e5c8ac4d508
1 /*
2 * Programming of FT232R internal EEPROM requires a special magic sequence
3 * of non-EEPROM-specific commands to be issued prior to actual EEPROM write
4 * commands. This module implements this magic command sequence.
5 */
6
7 #include <sys/types.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <usb.h>
11 #include "ftdi_defs.h"
12 #include "ftdi_tune.h"
13 #include "eeprom_func.h"
14
15 void ft232r_eeprom_magic(usb_dev_handle *usbh)
16 {
17 u_char buf[2];
18 int rc;
19
20 /* equivalent of ftdi_usb_reset() */
21 rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
22 SIO_RESET_SIO, 0, NULL, 0, USB_WRITE_TIMEOUT);
23 if (rc != 0) {
24 fprintf(stderr,
25 "ftdi_usb_reset error: usb_control_msg() returned %d\n",
26 rc);
27 exit(1);
28 }
29 /* equivalent of ftdi_poll_modem_status() */
30 rc = usb_control_msg(usbh, FTDI_DEVICE_IN_REQTYPE,
31 SIO_POLL_MODEM_STATUS_REQUEST, 0, 0, (char *) buf,
32 2, USB_READ_TIMEOUT);
33 if (rc != 2) {
34 fprintf(stderr,
35 "ftdi_poll_modem_status error: usb_control_msg() returned %d\n",
36 rc);
37 exit(1);
38 }
39 /* equivalent of ftdi_set_latency_timer() */
40 rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE,
41 SIO_SET_LATENCY_TIMER_REQUEST, 0x77, 0, NULL, 0,
42 USB_WRITE_TIMEOUT);
43 if (rc != 0) {
44 fprintf(stderr,
45 "ftdi_set_latency_timer error: usb_control_msg() returned %d\n",
46 rc);
47 exit(1);
48 }
49 }