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annotate libftmini/ft232r_magic.c @ 83:b3989befca98

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doc/CP2102-EEPROM-format: list maximum lengths of textual strings
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 17:40:04 +0000
parents 4e5c8ac4d508
children
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4e5c8ac4d508 libftmini: add function for FT232R magic
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1 /*
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2 * Programming of FT232R internal EEPROM requires a special magic sequence
4e5c8ac4d508 libftmini: add function for FT232R magic
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3 * of non-EEPROM-specific commands to be issued prior to actual EEPROM write
4e5c8ac4d508 libftmini: add function for FT232R magic
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4 * commands. This module implements this magic command sequence.
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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 <stdio.h>
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9 #include <stdlib.h>
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10 #include <usb.h>
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11 #include "ftdi_defs.h"
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12 #include "ftdi_tune.h"
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13 #include "eeprom_func.h"
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14
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15 void ft232r_eeprom_magic(usb_dev_handle *usbh)
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16 {
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17 u_char buf[2];
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18 int rc;
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19
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20 /* equivalent of ftdi_usb_reset() */
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21 rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE, SIO_RESET_REQUEST,
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22 SIO_RESET_SIO, 0, NULL, 0, USB_WRITE_TIMEOUT);
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23 if (rc != 0) {
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24 fprintf(stderr,
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25 "ftdi_usb_reset error: usb_control_msg() returned %d\n",
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26 rc);
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27 exit(1);
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28 }
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29 /* equivalent of ftdi_poll_modem_status() */
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30 rc = usb_control_msg(usbh, FTDI_DEVICE_IN_REQTYPE,
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31 SIO_POLL_MODEM_STATUS_REQUEST, 0, 0, (char *) buf,
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32 2, USB_READ_TIMEOUT);
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33 if (rc != 2) {
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34 fprintf(stderr,
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35 "ftdi_poll_modem_status error: usb_control_msg() returned %d\n",
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36 rc);
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37 exit(1);
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38 }
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39 /* equivalent of ftdi_set_latency_timer() */
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40 rc = usb_control_msg(usbh, FTDI_DEVICE_OUT_REQTYPE,
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41 SIO_SET_LATENCY_TIMER_REQUEST, 0x77, 0, NULL, 0,
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42 USB_WRITE_TIMEOUT);
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43 if (rc != 0) {
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44 fprintf(stderr,
4e5c8ac4d508 libftmini: add function for FT232R magic
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45 "ftdi_set_latency_timer error: usb_control_msg() returned %d\n",
4e5c8ac4d508 libftmini: add function for FT232R magic
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46 rc);
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47 exit(1);
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48 }
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49 }