FreeCalypso > hg > freecalypso-reveng

annotate miscprog/tone-convert.c @ 393:6c31d8c54ae4

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se_k200i: preliminary analysis
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 06 Nov 2022 01:13:43 +0000
parents 4307b57229d3
children
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382
4307b57229d3 miscprog: tone-convert written, compiles
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1 /*
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2 * This command line utility converts a Calypso DSP tone specification from
4307b57229d3 miscprog: tone-convert written, compiles
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3 * frequency in Hz and amplitude in dBfs into the 16-bit tone control word
4307b57229d3 miscprog: tone-convert written, compiles
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4 * that would go into the DSP for the keybeep or tones audio task.
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5 *
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6 * The conversion is done in exactly the same way how RiViera Audio Service
4307b57229d3 miscprog: tone-convert written, compiles
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7 * does it, allowing the possibility of reconstructing Audio Service API
4307b57229d3 miscprog: tone-convert written, compiles
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8 * input values from DSP tone control words captured in L1 traces.
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9 */
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10
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11 #include <math.h>
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12 #include <stdio.h>
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13 #include <stdlib.h>
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14
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15 main(argc, argv)
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16 char **argv;
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17 {
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18 int freq_hz, ampl_dbfs;
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19 double frequency_index, frequency_beep;
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20 double amplitude_beep, amplitude, amplitude_index;
4307b57229d3 miscprog: tone-convert written, compiles
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21 unsigned output;
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22
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23 if (argc != 3) {
4307b57229d3 miscprog: tone-convert written, compiles
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24 fprintf(stderr, "usage: %s freq ampl\n", argv[0]);
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25 exit(1);
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26 }
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27 freq_hz = atoi(argv[1]);
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28 ampl_dbfs = atoi(argv[2]);
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29
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30 /* code from RiViera Audio Service */
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31 /* frequency computation */
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32 frequency_beep = (double) freq_hz;
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33 frequency_index = (256 * cos(6.283185*(frequency_beep/8000)));
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34 /* amplitude computation */
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35 amplitude_beep = (double) ampl_dbfs;
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36 amplitude = exp((amplitude_beep*0.115129)+(5.544625));
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37 amplitude_index = amplitude * sin(6.283185*(frequency_beep/8000));
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38 /* output word */
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39 output = (unsigned)((((unsigned)(frequency_index))<<8) |
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40 ((unsigned)(amplitude_index)));
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41
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42 printf("0x%04X\n", output);
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43 exit(0);
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44 }