FreeCalypso > hg > fc-rfcal-tools
view autocal/vcxomain.c @ 26:a2e4da9d85cc
fc-rfcal-vcxo: search for zero crossing implemented
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Mon, 22 May 2017 22:27:22 +0000 |
parents | 0b6881281d86 |
children | 841dd03d5c85 |
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/* * This module contains the main() function for fc-rfcal-vcxo. */ #include <stdio.h> #include <stdlib.h> #include <rvinterf/l1tm.h> #include <rvinterf/exitcodes.h> #include "stdband.h" #define VCXOCAL_BAND 900 #define VCXOCAL_BAND_RFPW RFPW_STD_BAND(6, 0) #define VCXOCAL_ARFCN 40 extern float vcxo_freq_meas(); static float freq_max_neg, freq_max_pos; static float lin_a, lin_b, lin_a2, lin_b2; static int zero_search_dac1, zero_search_dac2, zero_search_incr; static float zero_search_freq1, zero_search_freq2; prepare_rf_test_system() { char cmd[80]; printf("Preparing RF test system for VCXO calibration\n"); sprintf(cmd, "vcxo-cal-setup %d %d\n", VCXOCAL_BAND, VCXOCAL_ARFCN); tsid_command(cmd); return(0); } main(argc, argv) char **argv; { socket_pathname_options(argc, argv); connect_rvinterf_socket(); connect_tsid_socket(); prepare_rf_test_system(); printf("Putting the DUT into Test Mode\n"); do_tms(1); do_rfpw(STD_BAND_FLAG, VCXOCAL_BAND_RFPW); do_rfpw(TCH_ARFCN, VCXOCAL_ARFCN); do_rfpw(AFC_ENA_FLAG, 0); do_txpw(TX_PWR_LEVEL, 12); printf("Starting RF Tx on the DUT\n"); do_rfe(RX_TX_TCH); /* initial measurements at the DAC extremes */ freq_max_neg = vcxo_freq_meas(-2048, "max-neg"); freq_max_pos = vcxo_freq_meas(2048, "max-pos"); lin_a = (freq_max_pos - freq_max_neg) / 4096.0f; lin_b = freq_max_pos - lin_a * 2048.0f; zero_search_dac1 = -lin_b / lin_a; zero_search_freq1 = vcxo_freq_meas(zero_search_dac1, "zero-search"); /* search for zero crossing */ if (zero_search_freq1 < 0) zero_search_incr = 100; else zero_search_incr = -100; for (;;) { zero_search_dac2 = zero_search_dac1 + zero_search_incr; zero_search_freq2 = vcxo_freq_meas(zero_search_dac2, "zero-search"); if (zero_search_incr > 0 && zero_search_freq2 >= 0) break; if (zero_search_incr < 0 && zero_search_freq2 < 0) break; zero_search_dac1 = zero_search_dac2; zero_search_freq1 = zero_search_freq2; } printf("Stopping RF Tx on the DUT\n"); do_rfe(STOP_ALL); exit(0); }