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annotate vcxo-manual/linear.c @ 11:aeffe53e110d

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fc-cmu200d: freq-meas works
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 May 2017 19:22:11 +0000
parents bd62be88259d
children
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bd62be88259d initial import of rfcal code and docs from freecalypso-tools repository
Mychaela Falconia <falcon@freecalypso.org>
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include "meas.h"
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4
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5 struct meas meas[2];
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6 float lin_a, lin_b, target_off;
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7 int target_dac;
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8
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9 main(argc, argv)
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10 char **argv;
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11 {
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12 if (argc < 2 || argc > 3) {
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13 fprintf(stderr, "usage: %s meas-file [target]\n", argv[0]);
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14 exit(1);
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15 }
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16 read_meas_file(argv[1], meas, 2);
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17 if (argc > 2)
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18 target_off = atof(argv[2]);
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19 else
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20 target_off = 0;
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21 lin_a = (float)(meas[1].freq_offset - meas[0].freq_offset) /
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22 (float)(meas[1].dac_value - meas[0].dac_value);
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23 lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value;
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24 target_dac = (target_off - lin_b) / lin_a;
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25 printf("%d\n", target_dac);
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26 exit(0);
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27 }