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annotate autocal/vcxomain.c @ 26:a2e4da9d85cc

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fc-rfcal-vcxo: search for zero crossing implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 May 2017 22:27:22 +0000
parents 0b6881281d86
children 841dd03d5c85
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1 /*
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2 * This module contains the main() function for fc-rfcal-vcxo.
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3 */
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4
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5 #include <stdio.h>
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6 #include <stdlib.h>
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7 #include <rvinterf/l1tm.h>
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8 #include <rvinterf/exitcodes.h>
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9 #include "stdband.h"
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10
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11 #define VCXOCAL_BAND 900
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12 #define VCXOCAL_BAND_RFPW RFPW_STD_BAND(6, 0)
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13 #define VCXOCAL_ARFCN 40
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15 extern float vcxo_freq_meas();
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16
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17 static float freq_max_neg, freq_max_pos;
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18 static float lin_a, lin_b, lin_a2, lin_b2;
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19 static int zero_search_dac1, zero_search_dac2, zero_search_incr;
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20 static float zero_search_freq1, zero_search_freq2;
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9a9fd9ebe799 autocal/vcxomain.c: coming along
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22 prepare_rf_test_system()
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23 {
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24 char cmd[80];
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25
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26 printf("Preparing RF test system for VCXO calibration\n");
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27 sprintf(cmd, "vcxo-cal-setup %d %d\n", VCXOCAL_BAND, VCXOCAL_ARFCN);
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28 tsid_command(cmd);
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29 return(0);
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30 }
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31
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32 main(argc, argv)
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33 char **argv;
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34 {
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35 socket_pathname_options(argc, argv);
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36 connect_rvinterf_socket();
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37 connect_tsid_socket();
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38 prepare_rf_test_system();
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39
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40 printf("Putting the DUT into Test Mode\n");
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41 do_tms(1);
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42 do_rfpw(STD_BAND_FLAG, VCXOCAL_BAND_RFPW);
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43 do_rfpw(TCH_ARFCN, VCXOCAL_ARFCN);
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44 do_rfpw(AFC_ENA_FLAG, 0);
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45 do_txpw(TX_PWR_LEVEL, 12);
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46 printf("Starting RF Tx on the DUT\n");
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47 do_rfe(RX_TX_TCH);
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48
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49 /* initial measurements at the DAC extremes */
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50 freq_max_neg = vcxo_freq_meas(-2048, "max-neg");
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51 freq_max_pos = vcxo_freq_meas(2048, "max-pos");
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52 lin_a = (freq_max_pos - freq_max_neg) / 4096.0f;
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53 lin_b = freq_max_pos - lin_a * 2048.0f;
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54 zero_search_dac1 = -lin_b / lin_a;
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55 zero_search_freq1 = vcxo_freq_meas(zero_search_dac1, "zero-search");
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57 /* search for zero crossing */
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58 if (zero_search_freq1 < 0)
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59 zero_search_incr = 100;
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60 else
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61 zero_search_incr = -100;
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62 for (;;) {
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63 zero_search_dac2 = zero_search_dac1 + zero_search_incr;
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64 zero_search_freq2 = vcxo_freq_meas(zero_search_dac2,
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65 "zero-search");
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66 if (zero_search_incr > 0 && zero_search_freq2 >= 0)
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67 break;
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68 if (zero_search_incr < 0 && zero_search_freq2 < 0)
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69 break;
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70 zero_search_dac1 = zero_search_dac2;
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71 zero_search_freq1 = zero_search_freq2;
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72 }
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73
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74 printf("Stopping RF Tx on the DUT\n");
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75 do_rfe(STOP_ALL);
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76 exit(0);
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77 }