FreeCalypso > hg > fc-rfcal-tools

annotate autocal/vcxomain.c @ 28:ba4b6877e227

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fc-rfcal-vcxo: afcparams computation implemented
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 22 May 2017 23:36:14 +0000
parents 841dd03d5c85
children 4cd55371d3e4
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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 <math.h>
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6 #include <stdio.h>
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7 #include <stdint.h>
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8 #include <stdlib.h>
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9 #include <rvinterf/l1tm.h>
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10 #include <rvinterf/exitcodes.h>
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11 #include "afcparams.h"
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12 #include "stdband.h"
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13
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14 #define VCXOCAL_BAND 900
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15 #define VCXOCAL_BAND_RFPW RFPW_STD_BAND(6, 0)
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16 #define VCXOCAL_ARFCN 40
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17
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18 extern float vcxo_freq_meas();
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19
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20 static float freq_max_neg, freq_max_pos;
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21 static float lin_a, lin_b, lin_a2, lin_b2;
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22 static int zero_search_dac1, zero_search_dac2, zero_search_incr;
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23 static float zero_search_freq1, zero_search_freq2;
27
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24 static float dac_min, dac_max, dac_init;
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25 static int dac_init_int;
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26 static float Psi_sta, Psi_st;
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28 struct afcparams afcparams_host, afcparams_arm;
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29
23
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30 prepare_rf_test_system()
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31 {
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32 char cmd[80];
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33
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34 printf("Preparing RF test system for VCXO calibration\n");
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35 sprintf(cmd, "vcxo-cal-setup %d %d\n", VCXOCAL_BAND, VCXOCAL_ARFCN);
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36 tsid_command(cmd);
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37 return(0);
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38 }
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39
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40 main(argc, argv)
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41 char **argv;
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42 {
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43 socket_pathname_options(argc, argv);
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44 connect_rvinterf_socket();
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45 connect_tsid_socket();
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46 prepare_rf_test_system();
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47
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48 printf("Putting the DUT into Test Mode\n");
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49 do_tms(1);
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50 do_rfpw(STD_BAND_FLAG, VCXOCAL_BAND_RFPW);
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51 do_rfpw(TCH_ARFCN, VCXOCAL_ARFCN);
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52 do_rfpw(AFC_ENA_FLAG, 0);
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53 do_txpw(TX_PWR_LEVEL, 12);
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54 printf("Starting RF Tx on the DUT\n");
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55 do_rfe(RX_TX_TCH);
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56
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57 /* initial measurements at the DAC extremes */
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58 freq_max_neg = vcxo_freq_meas(-2048, "max-neg");
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59 freq_max_pos = vcxo_freq_meas(2048, "max-pos");
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60 lin_a = (freq_max_pos - freq_max_neg) / 4096.0f;
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61 lin_b = freq_max_pos - lin_a * 2048.0f;
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62 zero_search_dac1 = -lin_b / lin_a;
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63 zero_search_freq1 = vcxo_freq_meas(zero_search_dac1, "zero-search");
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64
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65 /* search for zero crossing */
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66 if (zero_search_freq1 < 0)
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67 zero_search_incr = 100;
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68 else
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69 zero_search_incr = -100;
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70 for (;;) {
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71 zero_search_dac2 = zero_search_dac1 + zero_search_incr;
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72 zero_search_freq2 = vcxo_freq_meas(zero_search_dac2,
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73 "zero-search");
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74 if (zero_search_incr > 0 && zero_search_freq2 >= 0)
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75 break;
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76 if (zero_search_incr < 0 && zero_search_freq2 < 0)
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77 break;
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78 zero_search_dac1 = zero_search_dac2;
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79 zero_search_freq1 = zero_search_freq2;
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80 }
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81
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82 /* second linear approximation */
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83 lin_a2 = (zero_search_freq2 - zero_search_freq1) /
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84 (float)(zero_search_dac2 - zero_search_dac1);
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85 lin_b2 = zero_search_freq2 - lin_a2 * zero_search_dac2;
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86
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87 /* DAC settings */
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88 dac_min = (-13500.0f - lin_b) / lin_a;
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89 dac_max = (13500.0f - lin_b) / lin_a;
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90 dac_init = -lin_b2 / lin_a2;
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91 dac_init_int = (int) dac_init;
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92
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93 /* check the frequency offset at the final DAC value */
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94 vcxo_freq_meas(dac_init_int, "zero-check");
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95
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96 /* done with the measurements and the Tx */
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97 printf("Stopping RF Tx on the DUT\n");
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98 do_rfe(STOP_ALL);
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99
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100 /* Psi computations */
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101 Psi_sta = 2.0f * (float)M_PI * lin_a / 270833.0f;
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102 Psi_st = Psi_sta * 0.8f;
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103
28
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104 /* compute and fill afcparams */
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105 afcparams_host.psi_sta_inv = (unsigned)(1.0f / Psi_sta);
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106 afcparams_host.psi_st = (unsigned)(Psi_st * 65536.0f);
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107 afcparams_host.psi_st_32 = (unsigned)(Psi_st * 65536.0f * 65536.0f);
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108 afcparams_host.psi_st_inv = (unsigned)(1.0f / Psi_st);
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109 afcparams_host.dac_center = (int)(dac_init * 8.0f);
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110 afcparams_host.dac_min = (int)(dac_min * 8.0f);
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111 afcparams_host.dac_max = (int)(dac_max * 8.0f);
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112 afcparams_host.snr_thr = 2560;
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113
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114 /* print them out */
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115 printf("afcparams Psi_sta_inv: %u\n", afcparams_host.psi_sta_inv);
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116 printf("afcparams Psi_st: %u\n", afcparams_host.psi_st);
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117 printf("afcparams Psi_st_32: %u\n", afcparams_host.psi_st_32);
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118 printf("afcparams Psi_st_inv: %u\n", afcparams_host.psi_st_inv);
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119 printf("afcparams DAC_INIT*8: %d\n", afcparams_host.dac_center);
ba4b6877e227 fc-rfcal-vcxo: afcparams computation implemented
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
120 printf("afcparams DAC_MIN*8: %d\n", afcparams_host.dac_min);
ba4b6877e227 fc-rfcal-vcxo: afcparams computation implemented
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
121 printf("afcparams DAC_MAX*8: %d\n", afcparams_host.dac_max);
ba4b6877e227 fc-rfcal-vcxo: afcparams computation implemented
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
122 printf("afcparams snr_thr: %d\n", afcparams_host.snr_thr);
ba4b6877e227 fc-rfcal-vcxo: afcparams computation implemented
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
123
ba4b6877e227 fc-rfcal-vcxo: afcparams computation implemented
Mychaela Falconia <falcon@freecalypso.org>
parents: 27
diff changeset
124 /* conversion to LE and sending to L1 remain to be implemented */
27
841dd03d5c85 fc-rfcal-vcxo: almost done
Mychaela Falconia <falcon@freecalypso.org>
parents: 26
diff changeset
125
24
0b6881281d86 fc-rfcal-vcxo ready for first test
Mychaela Falconia <falcon@freecalypso.org>
parents: 23
diff changeset
126 exit(0);
21
a3f48378658d autocal: beginning of fc-rfcal-vcxo
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
127 }