radio95/fm95
0
1
Fork 0
mirror of https://github.com/radio95-rnt/fm95.git synced 2026-02-27 11:33:54 +01:00
Code Issues Activity

not sure

Browse Source
This commit is contained in:
KubaPro010
2025-04-27 13:11:42 +02:00
parent ca82168784
commit c4d5c39ed5
17 changed files with 82 additions and 149 deletions
Download Patch File Download Diff File Expand all files Collapse all files

118
src/dcf95.c
View File

@@ -1,10 +1,10 @@
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <getopt.h>
#include <time.h>
#include <signal.h>
#include <string.h>
#include <math.h>
#define buffer_maxlength 2048
#define buffer_tlength_fragsize 2048
@@ -12,8 +12,8 @@
// #define DEBUG
#include "../lib/constants.h"
#include "../lib/oscillator.h"
#include "../dsp/constants.h"
#include "../dsp/oscillator.h"
#define DEFAULT_FREQ 77500.0f
#define DEFAULT_SAMPLE_RATE 192000
@@ -55,17 +55,12 @@ static void stop(int signum) {
unsigned int generate_chip() {
unsigned int chip = lfsr & 1;
lfsr >>= 1;
if (chip || !lfsr)
lfsr ^= 0x110;
if (chip || !lfsr)lfsr ^= 0x110;
return chip;
}
void reset_lfsr() {
lfsr = 0;
}
void reset_lfsr() { lfsr = 0; }
int is_cet_dst(struct tm *tm_time) {
int month = tm_time->tm_mon + 1;
@@ -74,16 +69,11 @@ int is_cet_dst(struct tm *tm_time) {
if (month == 3) {
int last_sunday = 31 - ((5 + 31) % 7);
if ((day > last_sunday) || (day == last_sunday && hour >= 2)) {
return 1;
}
} else if (month > 3 && month < 10) {
return 1;
} else if (month == 10) {
if ((day > last_sunday) || (day == last_sunday && hour >= 2)) return 1;
} else if (month > 3 && month < 10) return 1;
else if (month == 10) {
int last_sunday = 31 - ((5 + 31) % 7);
if ((day < last_sunday) || (day == last_sunday && hour < 3)) {
return 1;
}
if ((day < last_sunday) || (day == last_sunday && hour < 3)) return 1;
}
return 0;
@@ -132,41 +122,25 @@ void calculate_dcf77_bits(time_t now, int *bits) {
bits[20] = 1;
int minutes = t->tm_min;
for (int i = 0; i < 4; i++) {
bits[21 + i] = (minutes % 10 >> i) & 1;
}
for (int i = 0; i < 3; i++) {
bits[25 + i] = (minutes / 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) bits[21 + i] = (minutes % 10 >> i) & 1;
for (int i = 0; i < 3; i++) bits[25 + i] = (minutes / 10 >> i) & 1;
int minute_parity = 0;
for (int i = 21; i <= 27; i++) {
minute_parity ^= bits[i];
}
for (int i = 21; i <= 27; i++) minute_parity ^= bits[i];
bits[28] = minute_parity;
int hours = t->tm_hour;
if(cest) hours += 1;
for (int i = 0; i < 4; i++) {
bits[29 + i] = (hours % 10 >> i) & 1;
}
for (int i = 0; i < 2; i++) {
bits[33 + i] = (hours / 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) bits[29 + i] = (hours % 10 >> i) & 1;
for (int i = 0; i < 2; i++) bits[33 + i] = (hours / 10 >> i) & 1;
int hour_parity = 0;
for (int i = 29; i <= 34; i++) {
hour_parity ^= bits[i];
}
for (int i = 29; i <= 34; i++) hour_parity ^= bits[i];
bits[35] = hour_parity;
int day = t->tm_mday;
for (int i = 0; i < 4; i++) {
bits[36 + i] = (day % 10 >> i) & 1;
}
for (int i = 0; i < 2; i++) {
bits[40 + i] = (day / 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) bits[36 + i] = (day % 10 >> i) & 1;
for (int i = 0; i < 2; i++) bits[40 + i] = (day / 10 >> i) & 1;
int dow = t->tm_wday == 0 ? 7 : t->tm_wday;
bits[42] = dow & 0x01;
@@ -174,23 +148,15 @@ void calculate_dcf77_bits(time_t now, int *bits) {
bits[44] = (dow >> 2) & 0x01;
int month = t->tm_mon + 1;
for (int i = 0; i < 4; i++) {
bits[45 + i] = (month % 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) bits[45 + i] = (month % 10 >> i) & 1;
bits[49] = (month / 10) & 0x01;
int year = t->tm_year % 100;
for (int i = 0; i < 4; i++) {
bits[50 + i] = (year % 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) {
bits[54 + i] = (year / 10 >> i) & 1;
}
for (int i = 0; i < 4; i++) bits[50 + i] = (year % 10 >> i) & 1;
for (int i = 0; i < 4; i++) bits[54 + i] = (year / 10 >> i) & 1;
int year_parity = 0;
for (int i = 36; i <= 57; i++) {
year_parity ^= bits[i];
}
for (int i = 36; i <= 57; i++) year_parity ^= bits[i];
bits[58] = year_parity;
bits[59] = 2;
@@ -200,7 +166,7 @@ void print_dcf77_bits(const int *bits) {
printf("DCF77 Bit Pattern: ");
for (int i = 0; i < 60; i++) {
printf("%d", bits[i]);
if ((i+1) % 10 == 0) printf(" ");
if ((i+1) % 8 == 0) printf(" ");
}
printf("\n");
}
@@ -237,10 +203,10 @@ int main(int argc, char **argv) {
float master_volume = DEFAULT_MASTER_VOLUME;
float freq = DEFAULT_FREQ;
int sample_rate = DEFAULT_SAMPLE_RATE;
int offset = DEFAULT_OFFSET;
int test_mode = 0;
int no_phase = 0;
uint32_t sample_rate = DEFAULT_SAMPLE_RATE;
uint8_t offset = DEFAULT_OFFSET;
uint8_t test_mode = 0;
uint8_t no_phase = 0;
// #region Parse Arguments
int opt;
@@ -298,16 +264,13 @@ int main(int argc, char **argv) {
}
printf("Configuration:\n");
printf(" Output device: %s\n", audio_output_device);
printf(" Frequency: %.1f Hz\n", freq);
printf(" Sample rate: %d Hz\n", sample_rate);
printf(" Volume: %.2f\n", master_volume);
printf(" Time offset: %d seconds\n", offset);
if (no_phase) {
printf(" Phase modulation: Disabled\n");
} else {
printf(" Phase modulation: +/- %.1f degrees\n", PHASE_SHIFT);
}
printf("\tOutput device: %s\n", audio_output_device);
printf("\tFrequency: %.1f Hz\n", freq);
printf("\tSample rate: %d Hz\n", sample_rate);
printf("\tVolume: %.2f\n", master_volume);
printf("\tTime offset: %d seconds\n", offset);
if (no_phase) printf("\tPhase modulation: Disabled\n");
else printf("\tPhase modulation: +/- %.1f degrees\n", PHASE_SHIFT);
// #region Setup devices
pa_buffer_attr output_buffer_atr = {
@@ -416,11 +379,8 @@ int main(int argc, char **argv) {
unsigned int modulated_chip = chip ^ dcf77_bits[current_bit];
if (modulated_chip == 0) {
phase_offset = phase_shift_rad;
} else {
phase_offset = -phase_shift_rad;
}
if (modulated_chip == 0) phase_offset = phase_shift_rad;
else phase_offset = -phase_shift_rad;
current_chip_count++;
}
@@ -437,12 +397,8 @@ int main(int argc, char **argv) {
if ((dcf77_bits[current_bit] == 0 && ms_within_second < PULSE_0_DURATION) ||
(dcf77_bits[current_bit] == 1 && ms_within_second < PULSE_1_DURATION)) {
output[i] = carrier * master_volume * REDUCED_AMPLITUDE;
} else {
output[i] = carrier * master_volume;
}
} else {
output[i] = carrier * master_volume;
}
} else output[i] = carrier * master_volume;
} else output[i] = carrier * master_volume;
elapsed_samples++;
}