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annotate cp2102/read_eeprom.c @ 88:ea7b411aad27

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cp2102-decode-ee-desc: decode interface descriptor
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 27 Sep 2023 19:39:44 +0000
parents d4d3531d342a
children
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d4d3531d342a cp2102-read-eeprom program written, compiles
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This module implements the elementary function for reading the EEPROM
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3 * content out of a CP2102 device.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <stdio.h>
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8 #include <stdlib.h>
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9 #include <unistd.h>
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10 #include <usb.h>
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11 #include "cp210x_defs.h"
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12
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13 extern u_char eeprom[SIZE_EEPROM];
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14
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15 void
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16 read_eeprom(usbh)
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17 usb_dev_handle *usbh;
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18 {
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19 int rc;
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20
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21 rc = usb_control_msg(usbh, DEVICE_IN_REQTYPE, CP210x_CONFIG,
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22 REG_EEPROM, 0, (char *) eeprom, SIZE_EEPROM,
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23 USB_READ_TIMEOUT);
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24 if (rc != SIZE_EEPROM) {
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25 fprintf(stderr,
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26 "EEPROM read error: usb_control_msg() returned %d\n",
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27 rc);
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28 exit(1);
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29 }
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30 }