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annotate cp2102/intel_hex_out.c @ 68:5cbde3c80c24

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fteeprom-{erase,prog}: detach logic: change to detach by default As it turns out, detaching all ttyUSB interfaces of a multichannel device does not require outside knowledge of how many channels there are, as in our previous -d option design that is being removed here - instead we can read the bNumInterfaces constant from the USB device's config descriptor and thus know how many interfaces there are in total. Based on this discovery, change the design of fteeprom-{erase,prog} as follows: * remove -d option; * flip the default to where we detach all interfaces by default; * add -n option to NOT detach any interfaces.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 13 Sep 2023 06:37:03 +0000
parents 842cff427588
children
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1 /*
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2 * This module implements a function for writing out the same Intel HEX
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3 * format as used by cp210x-program-1.0, the Python-language tool from 2014.
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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 <string.h>
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8 #include <strings.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include "cp210x_defs.h"
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12
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13 void
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14 intel_hex_out(eeprom, outf)
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15 u_char *eeprom;
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16 FILE *outf;
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17 {
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18 unsigned linecnt, bytecnt;
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19 unsigned addr;
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20 u_char *sp;
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21 u_char record[21], *dp, csum;
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22
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23 sp = eeprom;
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24 addr = EEPROM_START_ADDR;
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25 for (linecnt = 0; linecnt < 64; linecnt++) {
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26 dp = record;
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27 *dp++ = 0x10;
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28 *dp++ = addr >> 8;
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29 *dp++ = addr;
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30 *dp++ = 0x00;
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31 for (bytecnt = 0; bytecnt < 16; bytecnt++)
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32 *dp++ = *sp++;
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33 csum = 0;
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34 for (bytecnt = 0; bytecnt < 20; bytecnt++)
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842cff427588 cp2102: fix Intel HEX read/write bugs
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35 csum += record[bytecnt];
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36 csum = 0x100 - csum;
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37 record[20] = csum;
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38 putc(':', outf);
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39 for (bytecnt = 0; bytecnt < 21; bytecnt++)
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40 fprintf(outf, "%02X", record[bytecnt]);
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41 putc('\n', outf);
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42 addr += 16;
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43 }
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44 fputs(":00000001FF\n", outf);
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45 }