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annotate autocal/vcxomeas.c @ 113:01bae2629ffd

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doc/Test-system-interface: txpwr-cal-channel addition documented
author Mychaela Falconia <falcon@freecalypso.org>
date Tue, 13 Feb 2018 04:39:33 +0000
parents 7ad0495991ed
children
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1 /*
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2 * This module contains the frequency measurement code for fc-rfcal-vcxo.
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3 */
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5 #include <math.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <unistd.h>
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9 #include <rvinterf/l1tm.h>
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10 #include <rvinterf/exitcodes.h>
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12 extern char tsid_response[];
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14 float
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15 vcxo_freq_meas(dac, hint)
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16 int dac;
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17 char *hint;
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18 {
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19 char cmd[80];
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20 double meas;
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22 printf("Performing frequency measurement at DAC=%d (%s)\n", dac, hint);
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23 do_rfpw(AFC_DAC_VALUE, dac);
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24 usleep(80000);
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25 sprintf(cmd, "freq-meas %s\n", hint);
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26 tsid_command(cmd);
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27 meas = atof(tsid_response + 1);
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28 printf("Measured frequency offset %.2f Hz\n", meas);
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29 if (isnan(meas)) {
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30 printf("Error: got NaN response, aborting\n");
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31 do_rfe(STOP_ALL);
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32 exit(ERROR_RFFAIL);
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33 }
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34 return(meas);
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35 }