FreeCalypso > hg > freecalypso-tools

annotate rfcal/vcxo-manual/linear.c @ 215:1a658ab756fe

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doc/Loadtools-on-GTA0x article added, replacing the corresponding section of the old loadtools/README file
author Mychaela Falconia <falcon@freecalypso.org>
date Fri, 19 May 2017 06:57:19 +0000
parents dcab0be3f67a
children
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dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
Mychaela Falconia <falcon@freecalypso.org>
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1 #include <stdio.h>
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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2 #include <stdlib.h>
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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3 #include "meas.h"
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4
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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5 struct meas meas[2];
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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6 float lin_a, lin_b, target_off;
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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7 int target_dac;
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8
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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9 main(argc, argv)
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10 char **argv;
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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11 {
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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12 if (argc < 2 || argc > 3) {
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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13 fprintf(stderr, "usage: %s meas-file [target]\n", argv[0]);
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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14 exit(1);
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15 }
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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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]);
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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19 else
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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20 target_off = 0;
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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21 lin_a = (float)(meas[1].freq_offset - meas[0].freq_offset) /
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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22 (float)(meas[1].dac_value - meas[0].dac_value);
dcab0be3f67a started manual VCXO calibration code: fc-vcxo-linear utility written
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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 }