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annotate cp2102/decode_baudtab.c @ 70:09da7db45dce

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doc/FTDI-EEPROM-format: document FT232R specifics
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 24 Sep 2023 21:31:37 +0000
parents 672c7adc8bc9
children
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4890ded06a8b cp2102-decode-baudtab program written, compiles
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1 /*
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2 * The function implemented in this module decodes the baud rate table
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3 * contained in the captured CP2102 EEPROM image.
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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 "cp210x_defs.h"
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10
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11 extern u_char eeprom[SIZE_EEPROM];
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12
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13 void
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14 decode_baud_table(outf)
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15 FILE *outf;
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16 {
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17 unsigned entry;
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18 u_char *dp;
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19 unsigned baudrate, baudgen, timegen, prescaler, sparebyte;
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20 unsigned baud_div, calc_baud, time_us;
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21
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22 dp = eeprom;
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23 for (entry = 0; entry < SIZE_BAUDRATES; entry++) {
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24 baudgen = (dp[0] << 8) | dp[1];
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25 timegen = (dp[2] << 8) | dp[3];
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26 prescaler = dp[4];
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27 sparebyte = dp[5];
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28 baudrate = dp[6] | (dp[7] << 8) | (dp[8] << 16) | (dp[9] << 24);
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29 dp += SIZE_BAUDRATE_CFG;
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30 fprintf(outf, "baud-entry %2u: %7u = %04X, %04X, %u, %u",
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31 entry, baudrate, baudgen, timegen, prescaler,
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32 sparebyte);
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33 if (prescaler) {
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34 baud_div = (0x10000 - baudgen) * prescaler;
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35 calc_baud = 24000000 / baud_div;
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36 fprintf(outf, "\t# %u baud, ", calc_baud);
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37 time_us = (0x10000 - timegen) * 2;
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38 if (time_us >= 1000)
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39 fprintf(outf, "%u.%03u ms", time_us / 1000,
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40 time_us % 1000);
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41 else
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42 fprintf(outf, "%u us", time_us);
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43 }
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44 putc('\n', outf);
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45 }
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46 }