/*
 * The basis steps of Tx power level calibration are implemented here.
 */

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <rvinterf/l1tm.h>
#include <rvinterf/exitcodes.h>
#include "txband.h"

extern double tx_power_meas();
extern vout_t dbm_to_vout();

extern struct txcal_band *txcal_band;
extern struct tx_basis_point tx_basis[MAX_BASIS_POINTS];
extern unsigned num_basis_points;

txcal_basis_run()
{
	unsigned n;
	double meas;
	int nanflag = 0;

	printf("Performing the calibration basis run\n");
	do_txpw(TX_PWR_LEVEL, txcal_band->start_plnum);
	printf("Starting RF Tx on the DUT\n");
	do_rfe(RX_TX_TCH);

	for (n = 0; n < num_basis_points; n++) {
		do_txpw(TX_APC_DAC, tx_basis[n].apc);
		usleep(20000);
		meas = tx_power_meas();
		printf("APC DAC=%u: %.2f dBm\n", tx_basis[n].apc, meas);
		if (isnan(meas))
			nanflag = 1;
		tx_basis[n].vout = dbm_to_vout(meas);
	}

	printf("Stopping RF Tx on the DUT\n");
	do_rfe(STOP_ALL);
	if (nanflag) {
		printf("Error: got NaN power measurement, aborting\n");
		exit(ERROR_RFFAIL);
	}
	return(0);
}

txcal_basis_compute()
{
	unsigned n;

	for (n = 0; n < num_basis_points - 1; n++) {
		if (tx_basis[n+1].vout <= tx_basis[n].vout) {
			fprintf(stderr,
			"error: Vout at APC=%u is not greater than at APC=%u\n",
				tx_basis[n+1].apc, tx_basis[n].apc);
			exit(ERROR_RFFAIL);
		}
		tx_basis[n].slope = (tx_basis[n+1].vout - tx_basis[n].vout) /
				    (tx_basis[n+1].apc - tx_basis[n].apc);
	}
	return(0);
}