FreeCalypso > hg > fc-usbser-tools

annotate libftmini/eeprom_rd.c @ 106:de3b299561b3

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udev: add rules file that works on my system
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 05 Oct 2023 01:08:28 +0000
parents 67ecb394b24f
children
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67ecb394b24f libftmini: starting with EEPROM read
Mychaela Falconia <falcon@freecalypso.org>
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1 /* elementary FTDI EEPROM read function */
67ecb394b24f libftmini: starting with EEPROM read
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2
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3 #include <sys/types.h>
67ecb394b24f libftmini: starting with EEPROM read
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4 #include <stdio.h>
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5 #include <stdlib.h>
67ecb394b24f libftmini: starting with EEPROM read
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6 #include <usb.h>
67ecb394b24f libftmini: starting with EEPROM read
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7 #include "ftdi_defs.h"
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8 #include "ftdi_tune.h"
67ecb394b24f libftmini: starting with EEPROM read
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9 #include "eeprom_func.h"
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67ecb394b24f libftmini: starting with EEPROM read
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11 u_short ftmini_read_eeprom_loc(usb_dev_handle *usbh, u_short addr)
67ecb394b24f libftmini: starting with EEPROM read
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12 {
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13 u_char buf[2];
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14 int rc;
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15
67ecb394b24f libftmini: starting with EEPROM read
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16 rc = usb_control_msg(usbh, FTDI_DEVICE_IN_REQTYPE,
67ecb394b24f libftmini: starting with EEPROM read
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17 SIO_READ_EEPROM_REQUEST, 0, addr, (char *) buf, 2,
67ecb394b24f libftmini: starting with EEPROM read
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18 USB_READ_TIMEOUT);
67ecb394b24f libftmini: starting with EEPROM read
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19 if (rc != 2) {
67ecb394b24f libftmini: starting with EEPROM read
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20 fprintf(stderr,
67ecb394b24f libftmini: starting with EEPROM read
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21 "EEPROM read error: usb_control_msg() returned %d\n",
67ecb394b24f libftmini: starting with EEPROM read
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22 rc);
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23 exit(1);
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24 }
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25 return buf[0] | (buf[1] << 8);
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26 }