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add 2nd dcf77 clock sync app
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‎non_catalog_apps/dcf77_clock_sync/LICENSE

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MIT License
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Copyright (c) 2024 Milko Daskalov
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎non_catalog_apps/dcf77_clock_sync/README.md

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# Flipper-Zero DCF77 Clock Sync
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Emulates the [DCF77](https://en.wikipedia.org/wiki/DCF77) time signal on the RFID antenna and on GPIO A4 pin.
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Uses PWM with frequency of 77.5 kHz on the GPIO pin to simulate the signal.
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# Usage
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Normally the clock gets syncrhonized in two to five minutes depending on the signal strength.
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The OK button changes the transmitted signal between CET and CEST (dst) time.
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# Antenna
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The RFID antenna wokrs best at distances of up to 50cm. The signal gets recognized in few seconds.
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When using the GPIO, best results are achieved if you connect a ferrite antenna over 330 ohm resistor and a capactior to ground.
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It also works with analog beeper or small in-ear headphone connected to the GPIO pin.

‎non_catalog_apps/dcf77_clock_sync/application.fam

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App(
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appid="dcf77_clock_sync",
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name="[DCF77] Clock Sync",
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apptype=FlipperAppType.EXTERNAL,
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entry_point="dcf77_clock_sync_app_main",
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requires=["gui"],
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stack_size=1 * 1024,
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order=10,
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fap_icon="icons/app_10x10.png",
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fap_category="Tools",
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fap_author="@mdaskalov",
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fap_weburl="https://github.com/mdaskalov/dcf77-clock-sync.git",
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fap_version="1.1",
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fap_description="Emulate DCF77 time signal on the RFID antena and the A4 GPIO pin",
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)

‎non_catalog_apps/dcf77_clock_sync/dcf77.c

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#include <furi_hal.h>
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#define DST_BIT 17
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#define MIN_BIT 21
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#define HOUR_BIT 29
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#define DAY_BIT 36
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#define WEEKDAY_BIT 42
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#define MONTH_BIT 45
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#define YEAR_BIT 50
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static uint8_t dcf77_bits[] = {
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0, // 00: Start of minute
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8, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 01: Weather broadcast / Civil warning bits
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8, // 15: Call bit: abnormal transmitter operation
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0, // 16: Summer time announcement. Set during hour before change
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0, 1, // 17: 01=CET, 10=CEST
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0, // 19: Leap second announcement. Set during hour before leap second
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1, // 20: Start of encoded time
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8, 0, 0, 0, 0, 0, 0, 0, // 21: Minutes (7bit + parity, 00-59)
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8, 0, 0, 0, 0, 0, 0, // 29: Hours (6bit + parity, 0-23)
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8, 0, 0, 0, 0, 0, // 36: Day of month (6bit, 1-31)
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8, 0, 0, // 42: Day of week (3bit, 1-7, Monday=1)
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8, 0, 0, 0, 0, // 45: Month number (5bit, 1-12)
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8, 0, 0, 0, 0, 0, 0, 0, 0, // 50: Year within century (8bit + parity, 00-99)
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0 // 59: Not used
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};
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void dcf77_encode(int start, int len, int val, int par) {
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uint8_t parity = (par != -1 ? par : dcf77_bits[start]) & 1;
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uint8_t byte = ((val / 10) << 4) + (val % 10);
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for(int bit = 0; bit < len; bit++) {
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uint8_t dcf77_bit = (byte >> bit) & 1;
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parity ^= dcf77_bit;
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dcf77_bits[start + bit] = (dcf77_bits[start + bit] & 0x0E) + dcf77_bit;
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}
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dcf77_bits[start + len] = (dcf77_bits[start + len] & 0xE) + (parity & 1);
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}
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void set_dcf77_time(DateTime* dt, bool is_dst) {
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dcf77_encode(DST_BIT, 2, is_dst > 0 ? 1 : 2, 1); // parity = leap second -> 0
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dcf77_encode(MIN_BIT, 7, dt->minute, 0);
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dcf77_encode(HOUR_BIT, 6, dt->hour, 0);
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dcf77_encode(DAY_BIT, 6, dt->day, 0);
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dcf77_encode(WEEKDAY_BIT, 3, dt->weekday, -1);
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dcf77_encode(MONTH_BIT, 5, dt->month, -1);
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dcf77_encode(YEAR_BIT, 8, dt->year % 100, -1);
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}
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bool get_dcf77_bit(int sec) {
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return dcf77_bits[sec % 60] & 1;
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}
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char* get_dcf77_data(int sec) {
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static char data[70];
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int idx = 0;
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int start = sec > 25 ? sec - 25 : 0;
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for(int bit = start; bit <= sec; bit++) {
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if(dcf77_bits[bit] & 8) data[idx++] = '-';
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data[idx++] = '0' + (dcf77_bits[bit] & 1);
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}
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data[idx] = 0;
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return data;
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}

‎non_catalog_apps/dcf77_clock_sync/dcf77.h

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#pragma once
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#include <furi_hal.h>
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void set_dcf77_time(DateTime* dt, bool is_dst);
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int get_dcf77_bit(int sec);
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char* get_dcf77_data(int sec);

‎non_catalog_apps/dcf77_clock_sync/dcf77_clock_sync.c

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#include <furi_hal.h>
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#include <furi_hal_pwm.h>
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#include <gui/gui.h>
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#include <notification/notification.h>
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#include <notification/notification_messages.h>
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#include "dcf77.h"
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#define SCREEN_SIZE_X 128
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#define SCREEN_SIZE_Y 64
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#define DCF77_FREQ 77500
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#define DCF77_OFFSET 60
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#define SYNC_DELAY 50
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#define UPDATES 8
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#define SECONDS_PER_MINUTE 60
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#define SECONDS_PER_HOUR (SECONDS_PER_MINUTE * 60)
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#define SECONDS_PER_DAY (SECONDS_PER_HOUR * 24)
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#define MONTHS_COUNT 12
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#define EPOCH_START_YEAR 1970
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char* WEEKDAYS[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
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typedef struct {
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DateTime dt;
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DateTime dcf_dt;
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bool is_dst;
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} AppData;
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static void app_draw_callback(Canvas* canvas, void* context) {
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AppData* app_data = (AppData*)context;
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char buffer[64];
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snprintf(
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buffer,
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sizeof(buffer),
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"%02u:%02u:%02u",
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app_data->dt.hour,
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app_data->dt.minute,
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app_data->dt.second);
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canvas_set_font(canvas, FontBigNumbers);
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canvas_draw_str_aligned(
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canvas, SCREEN_SIZE_X / 2, SCREEN_SIZE_Y / 2, AlignCenter, AlignCenter, buffer);
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const char* dow_str = WEEKDAYS[(app_data->dt.weekday - 1) % 7];
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const char* dst_str = app_data->is_dst ? "CEST" : "CET";
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snprintf(
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buffer,
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sizeof(buffer),
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"%s %02u-%02u-%04u %s",
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dow_str,
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app_data->dt.day,
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app_data->dt.month,
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app_data->dt.year,
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dst_str);
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canvas_set_font(canvas, FontSecondary);
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canvas_draw_str_aligned(canvas, SCREEN_SIZE_X / 2, 0, AlignCenter, AlignTop, buffer);
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if(app_data->dt.second < 59) {
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char* data = get_dcf77_data(app_data->dt.second);
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canvas_draw_str_aligned(
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canvas, SCREEN_SIZE_X, SCREEN_SIZE_Y, AlignRight, AlignBottom, data);
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}
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}
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static void app_input_callback(InputEvent* input_event, void* ctx) {
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furi_assert(ctx);
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FuriMessageQueue* event_queue = ctx;
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furi_message_queue_put(event_queue, input_event, FuriWaitForever);
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}
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void time_add(DateTime* from, DateTime* to, int add) {
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uint32_t timestamp = datetime_datetime_to_timestamp(from) + add;
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uint32_t days = timestamp / SECONDS_PER_DAY;
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uint32_t seconds_in_day = timestamp % SECONDS_PER_DAY;
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to->year = EPOCH_START_YEAR;
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while(days >= datetime_get_days_per_year(to->year)) {
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days -= datetime_get_days_per_year(to->year);
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(to->year)++;
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}
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to->month = 1;
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while(days >= datetime_get_days_per_month(datetime_is_leap_year(to->year), to->month)) {
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days -= datetime_get_days_per_month(datetime_is_leap_year(to->year), to->month);
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(to->month)++;
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}
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to->weekday = ((days + 4) % 7) + 1;
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to->day = days + 1;
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to->hour = seconds_in_day / SECONDS_PER_HOUR;
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to->minute = (seconds_in_day % SECONDS_PER_HOUR) / SECONDS_PER_MINUTE;
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to->second = seconds_in_day % SECONDS_PER_MINUTE;
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}
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int dcf77_clock_sync_app_main(void* p) {
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UNUSED(p);
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AppData app_data;
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InputEvent event;
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app_data.is_dst = false;
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furi_hal_rtc_get_datetime(&app_data.dt);
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time_add(&app_data.dt, &app_data.dcf_dt, DCF77_OFFSET);
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set_dcf77_time(&app_data.dcf_dt, app_data.is_dst);
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ViewPort* view_port = view_port_alloc();
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FuriMessageQueue* event_queue = furi_messa ge_queue_alloc(8, sizeof(InputEvent));
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view_port_draw_callback_set(view_port, app_draw_callback, &app_data);
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view_port_input_callback_set(view_port, app_input_callback, event_queue);
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Gui* gui = furi_record_open(RECORD_GUI);
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gui_add_view_port(gui, view_port, GuiLayerFullscreen);
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NotificationApp* notification = furi_record_open(RECORD_NOTIFICATION);
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notification_message_block(notification, &sequence_display_backlight_enforce_on);
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bool running = false;
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bool exit = false;
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int sec = app_data.dt.second;
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while(!exit) {
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int silence_ms = 0;
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// wait next second
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while(app_data.dt.second == sec) furi_hal_rtc_get_datetime(&app_data.dt);
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if(app_data.dt.second < 59) {
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furi_hal_light_set(LightRed | LightGreen | LightBlue, 0);
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if(running) {
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furi_hal_rfid_tim_read_stop();
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furi_hal_pwm_stop(FuriHalPwmOutputIdLptim2PA4);
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furi_hal_gpio_init(
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&gpio_ext_pa4, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh);
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}
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silence_ms = get_dcf77_bit(app_data.dt.second) ? 200 : 100;
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furi_delay_ms(silence_ms);
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furi_hal_rfid_tim_read_start(DCF77_FREQ, 0.5);
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furi_hal_pwm_start(FuriHalPwmOutputIdLptim2PA4, DCF77_FREQ, 50);
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running = true;
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furi_hal_light_set(LightBlue, 0xFF);
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} else {
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time_add(&app_data.dt, &app_data.dcf_dt, DCF77_OFFSET + 1);
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set_dcf77_time(&app_data.dcf_dt, app_data.is_dst);
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}
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sec = app_data.dt.second;
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int wait_ms = (1000 - silence_ms - SYNC_DELAY) / UPDATES;
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for(int i = 0; i < UPDATES; i++) {
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if(furi_message_queue_get(event_queue, &event, wait_ms) == FuriStatusOk) {
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if((event.type == InputTypePress) || (event.type == InputTypeRepeat)) {
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switch(event.key) {
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case InputKeyOk:
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app_data.is_dst = !app_data.is_dst;
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break;
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case InputKeyBack:
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exit = true;
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break;
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default:
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break;
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}
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}
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}
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view_port_update(view_port);
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if(exit) break;
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}
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}
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if(running) {
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furi_hal_rfid_tim_read_stop();
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furi_hal_pwm_stop(FuriHalPwmOutputIdLptim2PA4);
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furi_hal_light_set(LightRed | LightGreen | LightBlue, 0);
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}
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notification_message_block(notification, &sequence_display_backlight_enforce_auto);
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view_port_enabled_set(view_port, false);
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gui_remove_view_port(gui, view_port);
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furi_record_close(RECORD_NOTIFICATION);
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furi_record_close(RECORD_GUI);
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furi_message_queue_free(event_queue);
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view_port_free(view_port);
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return 0;
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}

‎non_catalog_apps/dcf77_clock_sync/icons/app_10x10.png

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‎non_catalog_apps/dcf77_clock_sync/img/1.png

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