ttrftech/NanoVNA
1
0
Fork 0
mirror of https://github.com/ttrftech/NanoVNA.git synced 2026-04-07 07:24:05 +00:00
Code Issues Projects Releases Packages Wiki Activity

feat: add marker smith value format menu

Browse source
This commit is contained in:
TT 2019-11-30 10:17:14 +09:00
parent 14a130c24b
commit 0bfa2c073e
3 changed files with 86 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

76
plot.c
View file

@ -428,7 +428,7 @@ draw_on_strut(int v0, int d, int color)
/*
* calculate log10(abs(gamma))
*/
float logmag(float *v)
float logmag(const float *v)
{
return log10f(v[0]*v[0] + v[1]*v[1]) * 10;
}
@ -436,7 +436,7 @@ float logmag(float *v)
/*
* calculate phase[-2:2] of coefficient
*/
float phase(float *v)
float phase(const float *v)
{
return 2 * atan2f(v[1], v[0]) / M_PI * 90;
}
@ -444,7 +444,7 @@ float phase(float *v)
/*
* calculate groupdelay
*/
float groupdelay(float *v, float *w, float deltaf)
float groupdelay(const float *v, const float *w, float deltaf)
{
#if 1
// atan(w)-atan(v) = atan((w-v)/(1+wv))
@ -459,7 +459,7 @@ float groupdelay(float *v, float *w, float deltaf)
/*
* calculate abs(gamma)
*/
float linear(float *v)
float linear(const float *v)
{
return - sqrtf(v[0]*v[0] + v[1]*v[1]);
}
@ -467,7 +467,7 @@ float linear(float *v)
/*
* calculate vswr; (1+gamma)/(1-gamma)
*/
float swr(float *v)
float swr(const float *v)
{
float x = sqrtf(v[0]*v[0] + v[1]*v[1]);
if (x > 1)
@ -475,14 +475,14 @@ float swr(float *v)
return (1 + x)/(1 - x);
}
float resitance(float *v) {
float resitance(const float *v) {
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
float zr = ((1+v[0])*(1-v[0]) - v[1]*v[1]) * d;
return zr;
}
float reactance(float *v) {
float reactance(const float *v) {
float z0 = 50;
float d = z0 / ((1-v[0])*(1-v[0])+v[1]*v[1]);
float zi = 2*v[1] * d;
@ -572,10 +572,11 @@ static int
string_value_with_prefix(char *buf, int len, float val, char unit)
{
char prefix;
int n;
int n = 0;
if (val < 0) {
val = -val;
*buf++ = '-';
*buf = '-';
n++;
len--;
}
if (val < 1e-12) {
@ -607,11 +608,11 @@ string_value_with_prefix(char *buf, int len, float val, char unit)
}
if (val < 10) {
n = chsnprintf(buf, len, "%.2f", val);
n += chsnprintf(&buf[n], len, "%.2f", val);
} else if (val < 100) {
n = chsnprintf(buf, len, "%.1f", val);
n += chsnprintf(&buf[n], len, "%.1f", val);
} else {
n = chsnprintf(buf, len, "%d", (int)val);
n += chsnprintf(&buf[n], len, "%d", (int)val);
}
if (prefix)
@ -626,7 +627,7 @@ string_value_with_prefix(char *buf, int len, float val, char unit)
#define PI2 6.283184
static void
gamma2imp(char *buf, int len, const float coeff[2], uint32_t frequency)
format_smith_value(char *buf, int len, const float coeff[2], uint32_t frequency)
{
// z = (gamma+1)/(gamma-1) * z0
float z0 = 50;
@ -635,15 +636,44 @@ gamma2imp(char *buf, int len, const float coeff[2], uint32_t frequency)
float zi = 2*coeff[1] * d;
int n;
n = string_value_with_prefix(buf, len, zr, S_OHM[0]);
buf[n++] = ' ';
switch (uistat.marker_smith_format) {
case MS_LIN:
chsnprintf(buf, len, "%.2f %.1f" S_DEGREE, linear(coeff), phase(coeff));
break;
if (zi < 0) {
float c = -1 / (PI2 * frequency * zi);
string_value_with_prefix(buf+n, len-n, c, 'F');
} else {
float l = zi / (PI2 * frequency);
string_value_with_prefix(buf+n, len-n, l, 'H');
case MS_LOG: {
float v = logmag(coeff);
if (v == -INFINITY)
chsnprintf(buf, len, "-INF dB");
else
chsnprintf(buf, len, "%.1fdB %.1f" S_DEGREE, v, phase(coeff));
}
break;
case MS_REIM:
n = string_value_with_prefix(buf, len, coeff[0], '\0');
if (coeff[1] >= 0) buf[n++] = '+';
string_value_with_prefix(buf+n, len-n, coeff[1], 'j');
break;
case MS_RX:
n = string_value_with_prefix(buf, len, zr, S_OHM[0]);
buf[n++] = ' ';
string_value_with_prefix(buf+n, len-n, zi, 'j');
break;
case MS_RLC:
n = string_value_with_prefix(buf, len, zr, S_OHM[0]);
buf[n++] = ' ';
if (zi < 0) {
float c = -1 / (PI2 * frequency * zi);
string_value_with_prefix(buf+n, len-n, c, 'F');
} else {
float l = zi / (PI2 * frequency);
string_value_with_prefix(buf+n, len-n, l, 'H');
}
break;
}
}
@ -695,7 +725,7 @@ trace_get_value_string(int t, char *buf, int len, float array[101][2], int i)
chsnprintf(buf, len, "%.2f", v);
break;
case TRC_SMITH:
gamma2imp(buf, len, coeff, frequencies[i]);
format_smith_value(buf, len, coeff, frequencies[i]);
break;
case TRC_REAL:
chsnprintf(buf, len, "%.2f", coeff[0]);
@ -747,7 +777,7 @@ trace_get_value_string_delta(int t, char *buf, int len, float array[101][2], int
chsnprintf(buf, len, "\004%.2f", v);
break;
case TRC_SMITH:
gamma2imp(buf, len, coeff, frequencies[index]);
format_smith_value(buf, len, coeff, frequencies[index]);
break;
case TRC_REAL:
chsnprintf(buf, len, "\004%.2f", coeff[0] - coeff_ref[0]);