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annotate autocal/txlevels.c @ 98:615df2fb1ec3

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doc/Tx-cal-theory: update with both theory and practice
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 17 Jul 2017 22:49:35 +0000
parents a2d4cab0a592
children b0618796d28d
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1 /*
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2 * The calibration of Tx power levels is implemented here.
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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 "txband.h"
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10
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11 extern double tx_power_meas();
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12 extern vout_t dbm_to_vout();
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13
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14 extern struct txcal_band *txcal_band;
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15 extern struct tx_basis_point tx_basis[MAX_BASIS_POINTS];
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16 extern unsigned num_basis_points;
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17 extern struct tx_level tx_levels[MAX_TX_LEVELS];
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18
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19 unsigned
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20 find_apc_for_target(target_dbm, pslope)
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21 double target_dbm;
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22 vout_t *pslope;
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23 {
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24 vout_t target_vout;
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25 unsigned n;
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26 int apc_delta;
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27
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28 target_vout = dbm_to_vout(target_dbm);
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29 for (n = 0; n < num_basis_points - 1; n++)
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30 if (target_vout < tx_basis[n+1].vout)
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31 break;
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32 if (pslope)
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33 *pslope = tx_basis[n].slope;
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34 apc_delta = (target_vout - tx_basis[n].vout) / tx_basis[n].slope;
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35 return tx_basis[n].apc + apc_delta;
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36 }
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37
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38 calibrate_tx_levels()
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39 {
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40 unsigned plnum, plidx, apc;
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41 double target, meas;
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42
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43 printf("Calibrating Tx power levels\n");
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44 printf("Starting RF Tx on the DUT\n");
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45 do_rfe(RX_TX_TCH);
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46
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47 for (plnum = txcal_band->start_plnum; plnum <= txcal_band->end_plnum;
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48 plnum++) {
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49 do_txpw(TX_PWR_LEVEL, plnum);
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50 plidx = plnum - txcal_band->start_plnum;
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51 target = tx_levels[plidx].target;
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52 apc = find_apc_for_target(target, &tx_levels[plidx].slope);
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53 tx_levels[plidx].apc = apc;
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54 do_txpw(TX_APC_DAC, apc);
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55 usleep(20000);
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56 meas = tx_power_meas();
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57 printf(
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58 "Tx power level #%u: target %.1f dBm, APC=%u, meas %.2f dBm (%+.2f)\n",
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59 plnum, target, apc, meas, meas - target);
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60 }
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61
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62 printf("Stopping RF Tx on the DUT\n");
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63 do_rfe(STOP_ALL);
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64 return(0);
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65 }