forked from ttrftech/NanoVNA
/
main.c
1938 lines (1717 loc) · 46 KB
/
main.c
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/*
* Copyright (c) 2016-2017, TAKAHASHI Tomohiro (TTRFTECH) edy555@gmail.com
* All rights reserved.
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* The software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
#include "ch.h"
#include "hal.h"
#include "usbcfg.h"
#include "si5351.h"
#include "nanovna.h"
#include <chprintf.h>
#include <shell.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#define ENABLED_DUMP
static void apply_error_term(void);
static void apply_error_term_at(int i);
static void cal_interpolate(int s);
void sweep(void);
static MUTEX_DECL(mutex);
#define DRIVE_STRENGTH_AUTO (-1)
#define FREQ_HARMONICS 300000000
int32_t frequency_offset = 5000;
int32_t frequency = 10000000;
int8_t drive_strength = DRIVE_STRENGTH_AUTO;
int8_t frequency_updated = FALSE;
int8_t sweep_enabled = TRUE;
int8_t cal_auto_interpolate = TRUE;
int8_t redraw_requested = FALSE;
int8_t stop_the_world = FALSE;
int16_t vbat = 0;
static THD_WORKING_AREA(waThread1, 640);
static THD_FUNCTION(Thread1, arg)
{
(void)arg;
chRegSetThreadName("sweep");
while (1) {
if (stop_the_world) {
__WFI();
continue;
}
if (sweep_enabled) {
chMtxLock(&mutex);
sweep();
chMtxUnlock(&mutex);
} else {
__WFI();
ui_process();
}
if (vbat != -1) {
adc_stop(ADC1);
vbat = adc_vbat_read(ADC1);
touch_start_watchdog();
draw_battery_status();
}
/* calculate trace coordinates */
plot_into_index(measured);
/* plot trace as raster */
draw_all_cells();
}
}
void
pause_sweep(void)
{
sweep_enabled = FALSE;
}
void
resume_sweep(void)
{
sweep_enabled = TRUE;
}
void
toggle_sweep(void)
{
sweep_enabled = !sweep_enabled;
}
static void cmd_pause(BaseSequentialStream *chp, int argc, char *argv[])
{
(void)chp;
(void)argc;
(void)argv;
pause_sweep();
}
static void cmd_resume(BaseSequentialStream *chp, int argc, char *argv[])
{
(void)chp;
(void)argc;
(void)argv;
resume_sweep();
}
static void cmd_reset(BaseSequentialStream *chp, int argc, char *argv[])
{
(void)argc;
(void)argv;
if (argc == 1) {
if (strcmp(argv[0], "dfu") == 0) {
chprintf(chp, "Performing reset to DFU mode\r\n");
enter_dfu();
return;
}
}
chprintf(chp, "Performing reset\r\n");
rccEnableWWDG(FALSE);
WWDG->CFR = 0x60;
WWDG->CR = 0xff;
/* wait forever */
while (1)
;
}
int set_frequency(int freq)
{
int delay = 0;
if (frequency == freq)
return delay;
if (freq > 1400000000 && frequency <= 1400000000) {
tlv320aic3204_set_gain(95, 95);
delay += 10;
} else
if (freq > 1200000000 && frequency <= 1200000000) {
tlv320aic3204_set_gain(85, 85);
delay += 10;
} else
if (freq > 900000000 && frequency <= 900000000) {
tlv320aic3204_set_gain(75, 75);
delay += 10;
} else
if (freq > 600000000 && frequency <= 600000000) {
tlv320aic3204_set_gain(50, 50);
delay += 10;
} else
if (freq > FREQ_HARMONICS && frequency <= FREQ_HARMONICS) {
tlv320aic3204_set_gain(40, 40);
delay += 10;
} else
if (freq <= FREQ_HARMONICS && frequency > FREQ_HARMONICS) {
tlv320aic3204_set_gain(0, 0);
delay += 10;
}
int8_t ds = drive_strength;
if (ds == DRIVE_STRENGTH_AUTO) {
ds = freq > FREQ_HARMONICS ? SI5351_CLK_DRIVE_STRENGTH_8MA : SI5351_CLK_DRIVE_STRENGTH_2MA;
}
delay += si5351_set_frequency_with_offset(freq, frequency_offset, ds);
frequency = freq;
return delay;
}
static void cmd_offset(BaseSequentialStream *chp, int argc, char *argv[])
{
if (argc != 1) {
chprintf(chp, "usage: offset {frequency offset(Hz)}\r\n");
return;
}
frequency_offset = atoi(argv[0]);
set_frequency(frequency);
}
static void cmd_freq(BaseSequentialStream *chp, int argc, char *argv[])
{
int freq;
if (argc != 1) {
chprintf(chp, "usage: freq {frequency(Hz)}\r\n");
return;
}
pause_sweep();
chMtxLock(&mutex);
freq = atoi(argv[0]);
set_frequency(freq);
chMtxUnlock(&mutex);
}
static void cmd_power(BaseSequentialStream *chp, int argc, char *argv[])
{
if (argc != 1) {
chprintf(chp, "usage: power {0-3|-1}\r\n");
return;
}
drive_strength = atoi(argv[0]);
set_frequency(frequency);
}
static void cmd_time(BaseSequentialStream *chp, int argc, char *argv[])
{
RTCDateTime timespec;
(void)argc;
(void)argv;
rtcGetTime(&RTCD1, ×pec);
chprintf(chp, "%d/%d/%d %d\r\n", timespec.year+1980, timespec.month, timespec.day, timespec.millisecond);
}
static void cmd_dac(BaseSequentialStream *chp, int argc, char *argv[])
{
int value;
if (argc != 1) {
chprintf(chp, "usage: dac {value(0-4095)}\r\n");
chprintf(chp, "current value: %d\r\n", config.dac_value);
return;
}
value = atoi(argv[0]);
config.dac_value = value;
dacPutChannelX(&DACD2, 0, value);
}
static void cmd_saveconfig(BaseSequentialStream *chp, int argc, char *argv[])
{
(void)argc;
(void)argv;
config_save();
chprintf(chp, "Config saved.\r\n");
}
static void cmd_clearconfig(BaseSequentialStream *chp, int argc, char *argv[])
{
if (argc != 1) {
chprintf(chp, "usage: clearconfig {protection key}\r\n");
return;
}
if (strcmp(argv[0], "1234") != 0) {
chprintf(chp, "Key unmatched.\r\n");
return;
}
clear_all_config_prop_data();
chprintf(chp, "Config and all cal data cleared.\r\n");
}
static struct {
int16_t rms[2];
int16_t ave[2];
int callback_count;
#if 0
int32_t last_counter_value;
int32_t interval_cycles;
int32_t busy_cycles;
#endif
} stat;
int16_t rx_buffer[AUDIO_BUFFER_LEN * 2];
#ifdef ENABLED_DUMP
int16_t dump_buffer[AUDIO_BUFFER_LEN];
int16_t dump_selection = 0;
#endif
volatile int16_t wait_count = 0;
float measured[2][101][2];
static void
wait_dsp(int count)
{
wait_count = count;
//reset_dsp_accumerator();
while (wait_count)
__WFI();
}
#ifdef ENABLED_DUMP
static void
duplicate_buffer_to_dump(int16_t *p)
{
if (dump_selection == 1)
p = samp_buf;
else if (dump_selection == 2)
p = ref_buf;
memcpy(dump_buffer, p, sizeof dump_buffer);
}
#endif
void i2s_end_callback(I2SDriver *i2sp, size_t offset, size_t n)
{
#if PORT_SUPPORTS_RT
int32_t cnt_s = port_rt_get_counter_value();
int32_t cnt_e;
#endif
int16_t *p = &rx_buffer[offset];
(void)i2sp;
(void)n;
if (wait_count > 0) {
if (wait_count == 1)
dsp_process(p, n);
#ifdef ENABLED_DUMP
duplicate_buffer_to_dump(p);
#endif
--wait_count;
}
#if PORT_SUPPORTS_RT
cnt_e = port_rt_get_counter_value();
stat.interval_cycles = cnt_s - stat.last_counter_value;
stat.busy_cycles = cnt_e - cnt_s;
stat.last_counter_value = cnt_s;
#endif
stat.callback_count++;
}
static const I2SConfig i2sconfig = {
NULL, // TX Buffer
rx_buffer, // RX Buffer
AUDIO_BUFFER_LEN * 2,
NULL, // tx callback
i2s_end_callback, // rx callback
0, // i2scfgr
2 // i2spr
};
static void cmd_data(BaseSequentialStream *chp, int argc, char *argv[])
{
int i;
int sel = 0;
if (argc == 1)
sel = atoi(argv[0]);
if (sel == 0 || sel == 1) {
chMtxLock(&mutex);
for (i = 0; i < sweep_points; i++) {
chprintf(chp, "%f %f\r\n", measured[sel][i][0], measured[sel][i][1]);
}
chMtxUnlock(&mutex);
} else if (sel >= 2 && sel < 7) {
chMtxLock(&mutex);
for (i = 0; i < sweep_points; i++) {
chprintf(chp, "%f %f\r\n", cal_data[sel-2][i][0], cal_data[sel-2][i][1]);
}
chMtxUnlock(&mutex);
} else {
chprintf(chp, "usage: data [array]\r\n");
}
}
#ifdef ENABLED_DUMP
static void cmd_dump(BaseSequentialStream *chp, int argc, char *argv[])
{
int i, j;
int len;
if (argc == 1)
dump_selection = atoi(argv[0]);
wait_dsp(3);
len = AUDIO_BUFFER_LEN;
if (dump_selection == 1 || dump_selection == 2)
len /= 2;
for (i = 0; i < len; ) {
for (j = 0; j < 16; j++, i++) {
chprintf(chp, "%04x ", 0xffff & (int)dump_buffer[i]);
}
chprintf(chp, "\r\n");
}
}
#endif
static void cmd_capture(BaseSequentialStream *chp, int argc, char *argv[])
{
// read pixel count at one time (PART*2 bytes required for read buffer)
#define PART 320
(void)argc;
(void)argv;
// pause sweep
stop_the_world = TRUE;
chThdSleepMilliseconds(1000);
// use uint16_t spi_buffer[1024] (defined in ili9341) for read buffer
uint16_t *buf = &spi_buffer[0];
int len = 320 * 240;
int i;
ili9341_read_memory(0, 0, 320, 240, PART, buf);
for (i = 0; i < PART; i++) {
streamPut(chp, buf[i] >> 8);
streamPut(chp, buf[i] & 0xff);
}
len -= PART;
while (len > 0) {
ili9341_read_memory_continue(PART, buf);
for (i = 0; i < PART; i++) {
streamPut(chp, buf[i] >> 8);
streamPut(chp, buf[i] & 0xff);
}
len -= PART;
}
//*/
stop_the_world = FALSE;
}
#if 0
static void cmd_gamma(BaseSequentialStream *chp, int argc, char *argv[])
{
float gamma[2];
(void)argc;
(void)argv;
pause_sweep();
chMtxLock(&mutex);
wait_dsp(4);
calculate_gamma(gamma);
chMtxUnlock(&mutex);
chprintf(chp, "%d %d\r\n", gamma[0], gamma[1]);
}
#endif
static void (*sample_func)(float *gamma) = calculate_gamma;
static void cmd_sample(BaseSequentialStream *chp, int argc, char *argv[])
{
if (argc == 1) {
if (strcmp(argv[0], "ref") == 0) {
sample_func = fetch_amplitude_ref;
return;
} else if (strcmp(argv[0], "ampl") == 0) {
sample_func = fetch_amplitude;
return;
} else if (strcmp(argv[0], "gamma") == 0) {
sample_func = calculate_gamma;
return;
}
}
chprintf(chp, "usage: sample {gamma|ampl|ref}\r\n");
}
#if 0
int32_t frequency0 = 1000000;
int32_t frequency1 = 300000000;
int16_t sweep_points = 101;
uint32_t frequencies[101];
uint16_t cal_status;
float cal_data[5][101][2];
#endif
config_t config = {
/* magic */ CONFIG_MAGIC,
/* dac_value */ 1922,
/* grid_color */ 0x1084,
/* menu_normal_color */ 0xffff,
/* menu_active_color */ 0x7777,
/* trace_colors[4] */ { RGB565(0,255,255), RGB565(255,0,40), RGB565(0,0,255), RGB565(50,255,0) },
///* touch_cal[4] */ { 620, 600, 160, 190 },
/* touch_cal[4] */ { 693, 605, 124, 171 },
/* default_loadcal */ 0,
/* checksum */ 0
};
properties_t current_props = {
/* magic */ CONFIG_MAGIC,
/* frequency0 */ 50000, // start = 50kHz
/* frequency1 */ 900000000, // end = 900MHz
/* sweep_points */ 101,
/* cal_status */ 0,
/* frequencies */ {},
/* cal_data */ {},
/* electrical_delay */ 0,
/* trace[4] */
{/*enable, type, channel, polar, scale, refpos*/
{ 1, TRC_LOGMAG, 0, 0, 1.0, 7.0 },
{ 1, TRC_LOGMAG, 1, 0, 1.0, 7.0 },
{ 1, TRC_SMITH, 0, 1, 1.0, 0.0 },
{ 1, TRC_PHASE, 1, 0, 1.0, 4.0 }
},
/* markers[4] */ {
{ 1, 30, 0 }, { 0, 40, 0 }, { 0, 60, 0 }, { 0, 80, 0 }
},
/* active_marker */ 0,
/* checksum */ 0
};
properties_t *active_props = ¤t_props;
void
ensure_edit_config(void)
{
if (active_props == ¤t_props)
return;
//memcpy(¤t_props, active_props, sizeof(config_t));
active_props = ¤t_props;
// move to uncal state
cal_status = 0;
}
#if 0
static void cmd_scan(BaseSequentialStream *chp, int argc, char *argv[])
{
float gamma[2];
int i;
int32_t freq, step;
int delay;
(void)argc;
(void)argv;
pause_sweep();
chMtxLock(&mutex);
freq = frequency0;
step = (frequency1 - frequency0) / (sweep_points-1);
set_frequency(freq);
delay = 4;
for (i = 0; i < sweep_points; i++) {
freq = freq + step;
wait_dsp(delay);
delay = set_frequency(freq);
palClearPad(GPIOC, GPIOC_LED);
calculate_gamma(gamma);
palSetPad(GPIOC, GPIOC_LED);
chprintf(chp, "%d %d\r\n", gamma[0], gamma[1]);
}
chMtxUnlock(&mutex);
}
#endif
// main loop for measurement
void sweep(void)
{
int i;
int delay;
rewind:
frequency_updated = FALSE;
//delay = 3;
for (i = 0; i < sweep_points; i++) {
delay = set_frequency(frequencies[i]);
tlv320aic3204_select_in3(); // CH0:REFLECT
wait_dsp(delay);
// blink LED while scanning
palClearPad(GPIOC, GPIOC_LED);
/* calculate reflection coeficient */
(*sample_func)(measured[0][i]);
tlv320aic3204_select_in1(); // CH1:TRANSMISSION
wait_dsp(delay);
/* calculate transmission coeficient */
(*sample_func)(measured[1][i]);
// blink LED while scanning
palSetPad(GPIOC, GPIOC_LED);
if (cal_status & CALSTAT_APPLY)
apply_error_term_at(i);
if (electrical_delay != 0)
apply_edelay_at(i);
redraw_requested = FALSE;
ui_process();
if (redraw_requested)
return; // return to redraw screen asap.
if (frequency_updated)
goto rewind;
}
}
static void
update_marker_index(void)
{
int m;
int i;
for (m = 0; m < 4; m++) {
if (!markers[m].enabled)
continue;
uint32_t f = markers[m].frequency;
if (f < frequencies[0]) {
markers[m].index = 0;
markers[m].frequency = frequencies[0];
} else if (f >= frequencies[sweep_points-1]) {
markers[m].index = sweep_points-1;
markers[m].frequency = frequencies[sweep_points-1];
} else {
for (i = 0; i < sweep_points-1; i++) {
if (frequencies[i] <= f && f < frequencies[i+1]) {
uint32_t mid = (frequencies[i] + frequencies[i+1])/2;
if (f < mid) {
markers[m].index = i;
} else {
markers[m].index = i + 1;
}
break;
}
}
}
}
}
void
update_frequencies(void)
{
int i;
int32_t span;
int32_t start;
if (frequency1 > 0) {
start = frequency0;
span = (frequency1 - frequency0)/100;
} else {
int center = frequency0;
span = -frequency1;
start = center - span/2;
span /= 100;
}
for (i = 0; i < sweep_points; i++)
frequencies[i] = start + span * i / (sweep_points - 1) * 100;
update_marker_index();
frequency_updated = TRUE;
// set grid layout
update_grid();
}
void
freq_mode_startstop(void)
{
if (frequency1 <= 0) {
int center = frequency0;
int span = -frequency1;
ensure_edit_config();
frequency0 = center - span/2;
frequency1 = center + span/2;
}
}
void
freq_mode_centerspan(void)
{
if (frequency1 > 0) {
int start = frequency0;
int stop = frequency1;
ensure_edit_config();
frequency0 = (start + stop)/2; // center
frequency1 = -(stop - start); // span
}
}
#define START_MIN 50000
//#define STOP_MAX 900000000
#define STOP_MAX 1500000000
void
set_sweep_frequency(int type, float frequency)
{
int32_t freq = frequency;
bool cal_applied = cal_status & CALSTAT_APPLY;
switch (type) {
case ST_START:
freq_mode_startstop();
if (frequency < START_MIN)
freq = START_MIN;
if (frequency > STOP_MAX)
freq = STOP_MAX;
if (frequency0 != freq) {
ensure_edit_config();
frequency0 = freq;
// if start > stop then make start = stop
if (frequency1 < freq)
frequency1 = freq;
update_frequencies();
}
break;
case ST_STOP:
freq_mode_startstop();
if (frequency > STOP_MAX)
freq = STOP_MAX;
if (frequency < START_MIN)
freq = START_MIN;
if (frequency1 != freq) {
ensure_edit_config();
frequency1 = freq;
// if start > stop then make start = stop
if (frequency0 > freq)
frequency0 = freq;
update_frequencies();
}
break;
case ST_CENTER:
ensure_edit_config();
freq_mode_centerspan();
if (frequency0 != freq) {
ensure_edit_config();
frequency0 = freq;
int center = frequency0;
int span = -frequency1;
if (center-span/2 < START_MIN) {
span = (center - START_MIN) * 2;
frequency1 = -span;
}
if (center+span/2 > STOP_MAX) {
span = (STOP_MAX - center) * 2;
frequency1 = -span;
}
update_frequencies();
}
break;
case ST_SPAN:
freq_mode_centerspan();
if (frequency1 != -freq) {
ensure_edit_config();
frequency1 = -freq;
int center = frequency0;
int span = -frequency1;
if (center-span/2 < START_MIN) {
center = START_MIN + span/2;
frequency0 = center;
}
if (center+span/2 > STOP_MAX) {
center = STOP_MAX - span/2;
frequency0 = center;
}
update_frequencies();
}
break;
case ST_CW:
freq_mode_centerspan();
if (frequency0 != freq || frequency1 != 0) {
ensure_edit_config();
frequency0 = frequency;
frequency1 = 0;
update_frequencies();
}
break;
}
if (cal_auto_interpolate && cal_applied)
cal_interpolate(lastsaveid);
}
uint32_t
get_sweep_frequency(int type)
{
if (frequency1 >= 0) {
switch (type) {
case ST_START: return frequency0;
case ST_STOP: return frequency1;
case ST_CENTER: return (frequency0 + frequency1)/2;
case ST_SPAN: return frequency1 - frequency0;
case ST_CW: return (frequency0 + frequency1)/2;
}
} else {
switch (type) {
case ST_START: return frequency0 + frequency1/2;
case ST_STOP: return frequency0 - frequency1/2;
case ST_CENTER: return frequency0;
case ST_SPAN: return -frequency1;
case ST_CW: return frequency0;
}
}
return 0;
}
static void cmd_sweep(BaseSequentialStream *chp, int argc, char *argv[])
{
if (argc == 0) {
chprintf(chp, "%d %d %d\r\n", frequency0, frequency1, sweep_points);
return;
} else if (argc > 3) {
chprintf(chp, "usage: sweep {start(Hz)} [stop] [points]\r\n");
return;
}
if (argc >= 2) {
if (strcmp(argv[0], "start") == 0) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_START, value);
return;
} else if (strcmp(argv[0], "stop") == 0) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_STOP, value);
return;
} else if (strcmp(argv[0], "center") == 0) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_CENTER, value);
return;
} else if (strcmp(argv[0], "span") == 0) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_SPAN, value);
return;
} else if (strcmp(argv[0], "cw") == 0) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_CW, value);
return;
}
}
if (argc >= 1) {
int32_t value = atoi(argv[0]);
set_sweep_frequency(ST_START, value);
}
if (argc >= 2) {
int32_t value = atoi(argv[1]);
set_sweep_frequency(ST_STOP, value);
}
}
static void
eterm_set(int term, float re, float im)
{
int i;
for (i = 0; i < sweep_points; i++) {
cal_data[term][i][0] = re;
cal_data[term][i][1] = im;
}
}
static void
eterm_copy(int dst, int src)
{
memcpy(cal_data[dst], cal_data[src], sizeof cal_data[dst]);
}
const struct open_model {
float c0;
float c1;
float c2;
float c3;
} open_model = { 50, 0, -300, 27 };
#if 0
static void
adjust_ed(void)
{
int i;
for (i = 0; i < sweep_points; i++) {
// z=1/(jwc*z0) = 1/(2*pi*f*c*z0) Note: normalized with Z0
// s11ao = (z-1)/(z+1) = (1-1/z)/(1+1/z) = (1-jwcz0)/(1+jwcz0)
// prepare 1/s11ao to avoid dividing complex
float c = 1000e-15;
float z0 = 50;
//float z = 6.2832 * frequencies[i] * c * z0;
float z = 0.02;
cal_data[ETERM_ED][i][0] += z;
}
}
#endif
static void
eterm_calc_es(void)
{
int i;
for (i = 0; i < sweep_points; i++) {
// z=1/(jwc*z0) = 1/(2*pi*f*c*z0) Note: normalized with Z0
// s11ao = (z-1)/(z+1) = (1-1/z)/(1+1/z) = (1-jwcz0)/(1+jwcz0)
// prepare 1/s11ao for effeiciency
float c = 50e-15;
//float c = 1.707e-12;
float z0 = 50;
float z = 6.2832 * frequencies[i] * c * z0;
float sq = 1 + z*z;
float s11aor = (1 - z*z) / sq;
float s11aoi = 2*z / sq;
// S11mo’= S11mo - Ed
// S11ms’= S11ms - Ed
float s11or = cal_data[CAL_OPEN][i][0] - cal_data[ETERM_ED][i][0];
float s11oi = cal_data[CAL_OPEN][i][1] - cal_data[ETERM_ED][i][1];
float s11sr = cal_data[CAL_SHORT][i][0] - cal_data[ETERM_ED][i][0];
float s11si = cal_data[CAL_SHORT][i][1] - cal_data[ETERM_ED][i][1];
// Es = (S11mo'/s11ao + S11ms’)/(S11mo' - S11ms’)
float numr = s11sr + s11or * s11aor - s11oi * s11aoi;
float numi = s11si + s11oi * s11aor + s11or * s11aoi;
float denomr = s11or - s11sr;
float denomi = s11oi - s11si;
sq = denomr*denomr+denomi*denomi;
cal_data[ETERM_ES][i][0] = (numr*denomr + numi*denomi)/sq;
cal_data[ETERM_ES][i][1] = (numi*denomr - numr*denomi)/sq;
}
cal_status &= ~CALSTAT_OPEN;
cal_status |= CALSTAT_ES;
}
static void
eterm_calc_er(int sign)
{
int i;
for (i = 0; i < sweep_points; i++) {
// Er = sign*(1-sign*Es)S11ms'
float s11sr = cal_data[CAL_SHORT][i][0] - cal_data[ETERM_ED][i][0];
float s11si = cal_data[CAL_SHORT][i][1] - cal_data[ETERM_ED][i][1];
float esr = cal_data[ETERM_ES][i][0];
float esi = cal_data[ETERM_ES][i][1];
if (sign > 0) {
esr = -esr;
esi = -esi;
}
esr = 1 + esr;
float err = esr * s11sr - esi * s11si;
float eri = esr * s11si + esi * s11sr;
if (sign < 0) {
err = -err;
eri = -eri;
}
cal_data[ETERM_ER][i][0] = err;
cal_data[ETERM_ER][i][1] = eri;
}
cal_status &= ~CALSTAT_SHORT;
cal_status |= CALSTAT_ER;
}
// CAUTION: Et is inversed for efficiency
static void
eterm_calc_et(void)
{
int i;
for (i = 0; i < sweep_points; i++) {
// Et = 1/(S21mt - Ex)(1 - Es)
float esr = 1 - cal_data[ETERM_ES][i][0];
float esi = -cal_data[ETERM_ES][i][1];
float s21mr = cal_data[CAL_THRU][i][0] - cal_data[CAL_ISOLN][i][0];
float s21mi = cal_data[CAL_THRU][i][1] - cal_data[CAL_ISOLN][i][1];
float etr = esr * s21mr - esi * s21mi;
float eti = esr * s21mi + esi * s21mr;
float sq = etr*etr + eti*eti;
float invr = etr / sq;
float invi = -eti / sq;
cal_data[ETERM_ET][i][0] = invr;
cal_data[ETERM_ET][i][1] = invi;
}
cal_status &= ~CALSTAT_THRU;
cal_status |= CALSTAT_ET;
}
void apply_error_term(void)
{
int i;
for (i = 0; i < sweep_points; i++) {
// S11m' = S11m - Ed
// S11a = S11m' / (Er + Es S11m')
float s11mr = measured[0][i][0] - cal_data[ETERM_ED][i][0];
float s11mi = measured[0][i][1] - cal_data[ETERM_ED][i][1];
float err = cal_data[ETERM_ER][i][0] + s11mr * cal_data[ETERM_ES][i][0] - s11mi * cal_data[ETERM_ES][i][1];
float eri = cal_data[ETERM_ER][i][1] + s11mr * cal_data[ETERM_ES][i][1] + s11mi * cal_data[ETERM_ES][i][0];
float sq = err*err + eri*eri;
float s11ar = (s11mr * err + s11mi * eri) / sq;
float s11ai = (s11mi * err - s11mr * eri) / sq;
measured[0][i][0] = s11ar;
measured[0][i][1] = s11ai;
// CAUTION: Et is inversed for efficiency
// S21m' = S21m - Ex
// S21a = S21m' (1-EsS11a)Et
float s21mr = measured[1][i][0] - cal_data[ETERM_EX][i][0];
float s21mi = measured[1][i][1] - cal_data[ETERM_EX][i][1];