FreeCalypso > hg > freecalypso-tools

comparison rfcal/vcxo-manual/linear.c @ 181:dcab0be3f67a

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
started manual VCXO calibration code: fc-vcxo-linear utility written
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 12 Apr 2017 06:45:45 +0000
parents
children
comparison
equal deleted inserted replaced
180:e50c3aa1152a 181:dcab0be3f67a
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include "meas.h"
4
5 struct meas meas[2];
6 float lin_a, lin_b, target_off;
7 int target_dac;
8
9 main(argc, argv)
10 char **argv;
11 {
12 if (argc < 2 || argc > 3) {
13 fprintf(stderr, "usage: %s meas-file [target]\n", argv[0]);
14 exit(1);
15 }
16 read_meas_file(argv[1], meas, 2);
17 if (argc > 2)
18 target_off = atof(argv[2]);
19 else
20 target_off = 0;
21 lin_a = (float)(meas[1].freq_offset - meas[0].freq_offset) /
22 (float)(meas[1].dac_value - meas[0].dac_value);
23 lin_b = (float)meas[1].freq_offset - lin_a * meas[1].dac_value;
24 target_dac = (target_off - lin_b) / lin_a;
25 printf("%d\n", target_dac);
26 exit(0);
27 }