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annotate rfcal/vcxo-manual/genparams.c @ 186:9968717eedd7

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doc/VCXO_calibration written
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 14 Apr 2017 07:45:57 +0000
parents 3eb53be9e667
children
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9099a35a705f manual VCXO calibration code: fc-vcxo-param utility written
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1 #include <math.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include "meas.h"
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5
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6 struct meas meas[4];
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7 float lin_a, lin_b, lin_a2, lin_b2;
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8 float dac_min, dac_max, dac_init;
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9 float Psi_sta, Psi_st;
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10
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11 write_output(filename)
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12 char *filename;
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13 {
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14 FILE *outf;
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15
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16 if (filename) {
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17 outf = fopen(filename, "w");
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18 if (!outf) {
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19 perror(filename);
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20 exit(1);
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21 }
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22 } else
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23 outf = stdout;
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24
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25 fputs("rf_table afcparams\n\n", outf);
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26 /* Psi parameters */
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27 fprintf(outf, "%10u\t# Psi_sta_inv\n", (unsigned)(1.0f / Psi_sta));
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28 fprintf(outf, "%10u\t# Psi_st\n", (unsigned)(Psi_st * 65536.0f));
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29 fprintf(outf, "%10u\t# Psi_st_32\n",
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30 (unsigned)(Psi_st * 65536.0f * 65536.0f));
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31 fprintf(outf, "%10u\t# Psi_st_inv\n\n", (unsigned)(1.0f / Psi_st));
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32 /* DAC settings */
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33 fprintf(outf, "%10d\t# DAC_INIT * 8\n", (int)(dac_init * 8.0f));
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34 fprintf(outf, "%10d\t# DAC_MIN * 8\n", (int)(dac_min * 8.0f));
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35 fprintf(outf, "%10d\t# DAC_MAX * 8\n", (int)(dac_max * 8.0f));
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36 fprintf(outf, "%10d\t# snr_thr\n", 2560);
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37 /* rfpw 10 setting in a comment line */
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38 fprintf(outf, "\n# DAC_INIT: rfpw 10 %d\n", (int)dac_init);
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39
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40 if (filename)
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41 fclose(outf);
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42 }
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43
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44 main(argc, argv)
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45 char **argv;
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46 {
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47 if (argc < 2 || argc > 3) {
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48 fprintf(stderr, "usage: %s meas-file [outfile]\n", argv[0]);
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49 exit(1);
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50 }
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51 read_meas_file(argv[1], meas, 4);
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52
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53 /* first linear approximation */
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54 lin_a = (float)(meas[1].freq_offset - meas[0].freq_offset) /
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55 (float)(meas[1].dac_value - meas[0].dac_value);
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56 lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value;
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57
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58 /* second linear approximation */
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59 lin_a2 = (float)(meas[3].freq_offset - meas[2].freq_offset) /
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60 (float)(meas[3].dac_value - meas[2].dac_value);
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61 lin_b2 = (float)meas[3].freq_offset - lin_a2 * meas[3].dac_value;
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62
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63 /* DAC settings */
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64 dac_min = (-13500.0f - lin_b) / lin_a;
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65 dac_max = (13500.0f - lin_b) / lin_a;
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66 dac_init = -lin_b2 / lin_a2;
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67
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68 /* Psi computations */
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69 Psi_sta = 2.0f * (float)M_PI *
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70 (float)(meas[1].freq_offset - meas[0].freq_offset) /
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71 ((float)(meas[1].dac_value - meas[0].dac_value) * 270833.0f);
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72 Psi_st = Psi_sta * 0.8f;
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73
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74 /* spit it all out */
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75 write_output(argv[2]);
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76 exit(0);
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77 }