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osmocom-analog
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Plot IQ data as red points on display, if overdriven (vector length >= 1.0)

This commit is contained in:
Andreas Eversberg 2017-01-13 13:55:49 +01:00
parent c0e30d35d6
commit 21c5c3195d
1 changed files with 18 additions and 6 deletions
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24
src/common/display_iq.c
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@ -29,6 +29,7 @@
#define SIZE 23
static char screen[SIZE][MAX_DISPLAY_WIDTH];
static char overdrive[SIZE][MAX_DISPLAY_WIDTH];
static int iq_on = 0;
static double db = 80;
@ -107,7 +108,7 @@ void display_iq(float *samples, int length)
int i, j, k;
int color = 9; /* default color */
int x_center, y_center;
double I, Q, l, s;
double I, Q, L, l, s;
int x, y;
int width, h;
@ -134,12 +135,14 @@ void display_iq(float *samples, int length)
buffer[pos++] = *samples++;
if (pos == MAX_DISPLAY_IQ) {
memset(&screen, ' ', sizeof(screen));
memset(&overdrive, 0, sizeof(overdrive));
for (j = 0; j < MAX_DISPLAY_IQ; j++) {
I = buffer[j * 2];
Q = buffer[j * 2 + 1];
L = I*I + Q*Q;
if (iq_on > 1) {
/* logarithmic scale */
l = sqrt(I*I + Q*Q);
l = sqrt(L);
s = log10(l) * 20 + db;
if (s < 0)
s = 0;
@ -175,6 +178,8 @@ void display_iq(float *samples, int length)
screen[y/2][x] = '\'';
else
screen[y/2][x] = '.';
if (L > 1.0)
overdrive[y/2][x] = 1;
}
if (iq_on == 1)
sprintf(screen[0], "(IQ linear");
@ -202,10 +207,17 @@ void display_iq(float *samples, int length)
} else
putchar('|');
} else if (screen[j][k] == ':' || screen[j][k] == '.' || screen[j][k] == '\'') {
/* green plot */
if (color != 2) {
color = 2;
printf("\033[1;32m");
/* red / green plot */
if (overdrive[j][k]) {
if (color != 1) {
color = 1;
printf("\033[1;31m");
}
} else {
if (color != 2) {
color = 2;
printf("\033[1;32m");
}
}
putchar(screen[j][k]);
} else if (screen[j][k] != ' ') {