186 lines
5.8 KiB
C++
186 lines
5.8 KiB
C++
#if defined HAS_IF482
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/* NOTE:
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The IF482 Generator needs an high precise 1 Hz clock signal which cannot be
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acquired in suitable precision on the ESP32 SoC itself. Additional clocking
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hardware is required, ususally the clock signal is generated by external RTC or
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GPS which can generate a precise time pulse signal (+/- 2ppm).
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In this example code we use a Maxim DS3231 RTC chip, and configure the chips's
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interrupt output pin as clock. The clock signal triggers an interrupt on the
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ESP32, which controls the realtime output of IF482 telegram. This is why code in
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IF482.cpp depends on code in RTCTIME.cpp.
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*/
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///////////////////////////////////////////////////////////////////////////////
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/*
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IF482 Generator to control clocks with IF482 telegram input (e.g. BÜRK BU190)
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Example IF482 telegram: "OAL160806F170400"
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IF482 Specification:
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http://www.mobatime.com/fileadmin/user_upload/downloads/TE-112023.pdf
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The IF 482 telegram is a time telegram, which sends the time and date
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information as ASCII characters through the serial interface RS 232 or RS 422.
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Communication parameters:
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Baud rate: 9600 Bit/s
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Data bits 7
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Parity: even
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Stop bit: 1
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Jitter: < 50ms
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Interface : RS232 or RS422
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Synchronization: Telegram ends at the beginning of the second
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specified in the telegram
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Cycle: 1 second
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Format of ASCII telegram string:
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Byte Meaning ASCII Hex
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1 Start of telegram O 4F
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2 Monitoring* A 41
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3 Time-Season** W/S/U/L 57 or 53
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4 Year tens 0 .. 9 30 .. 39
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5 Year unit 0 .. 9 30 .. 39
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6 Month tens 0 or 1 30 or 31
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7 Month unit 0 .. 9 30 .. 39
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8 Day tens 0 .. 3 30 .. 33
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9 Day unit 0 .. 9 30 .. 39
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10 Day of week*** 1 .. 7 31 .. 37
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11 Hours tens 0 .. 2 30 .. 32
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12 Hours unit 0 .. 9 30 .. 39
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13 Minutes tens 0 .. 5 30 .. 35
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14 Minutes unit 0 .. 9 30 .. 39
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15 Seconds tens 0 .. 5 30 .. 35
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16 Seconds unit 0 .. 9 30 .. 39
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17 End of telegram CR 0D
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*) Monitoring:
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With a correctly received time in the sender unit, the ASCII character 'A' is
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issued. If 'M' is issued, this indicates that the sender was unable to receive
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any time signal for over 12 hours (time is accepted with ‘A’ and ‘M’).
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**) Season:
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W: Standard time,
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S: Season time,
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U: UTC time (not supported by all systems),
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L: Local Time
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***) Day of week:
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not evaluated by model BU-190
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*/
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///////////////////////////////////////////////////////////////////////////////
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#include "if482.h"
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// Local logging tag
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static const char TAG[] = "main";
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#define IF482_FRAME_SIZE (17)
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#define IF482_PULSE_DURATION (1000)
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HardwareSerial IF482(2); // use UART #2 (note: #1 may be in use for serial GPS)
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// initialize and configure IF482 Generator
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int if482_init(void) {
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// open serial interface
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IF482.begin(HAS_IF482);
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// start if482 serial output feed task
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xTaskCreatePinnedToCore(if482_loop, // task function
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"if482loop", // name of task
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2048, // stack size of task
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(void *)1, // parameter of the task
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3, // priority of the task
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&ClockTask, // task handle
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0); // CPU core
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assert(ClockTask); // has clock task started?
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#if defined RTC_INT && (RTC_CLK == IF482_PULSE_DURATION)
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pps_init(); // use pps clock
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#else
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pps_init(IF482_PULSE_DURATION); // use esp32 clock
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#endif
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pps_start(); // start pulse
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return 1; // success
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} // if482_init
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String IF482_Out(time_t tt) {
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time_t t = myTZ.toLocal(tt);
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char mon, buf[14], out[IF482_FRAME_SIZE];
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switch (timeStatus()) { // indicates if time has been set and recently synced
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case timeSet: // time is set and is synced
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mon = 'A';
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break;
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case timeNeedsSync: // time had been set but sync attempt did not succeed
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mon = 'M';
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break;
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default: // time not set, no valid time
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mon = '?';
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break;
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} // switch
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// do we have confident time/date?
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if ((timeStatus() == timeSet) || (timeStatus() == timeNeedsSync))
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snprintf(buf, sizeof(buf), "%02u%02u%02u%1u%02u%02u%02u", year(t) - 2000,
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month(t), day(t), weekday(t), hour(t), minute(t), second(t));
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else
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snprintf(buf, sizeof(buf), "000000F000000"); // no confident time/date
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// output IF482 telegram
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snprintf(out, sizeof(out), "O%cL%s\r", mon, buf);
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ESP_LOGD(TAG, "IF482 = %s", out);
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return out;
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}
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void if482_loop(void *pvParameters) {
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configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
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TickType_t wakeTime;
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const TickType_t timeOffset =
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pdMS_TO_TICKS(IF482_OFFSET); // duration of telegram transmit
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const TickType_t startTime = xTaskGetTickCount(); // now
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sync_clock(now()); // wait until begin of a new second
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BitsPending = true; // start blink in display
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// take timestamp at moment of start of new second
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const TickType_t shotTime = xTaskGetTickCount() - startTime - timeOffset;
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// task remains in blocked state until it is notified by isr
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for (;;) {
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xTaskNotifyWait(
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0x00, // don't clear any bits on entry
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ULONG_MAX, // clear all bits on exit
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&wakeTime, // receives moment of call from isr
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portMAX_DELAY); // wait forever (missing error handling here...)
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#if !defined RTC_CLK || (RTC_CLK == IF482_PULSE_DURATION) // we don't need clock rescaling
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// wait until it's time to start transmit telegram for next second
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vTaskDelayUntil(&wakeTime, shotTime); // sets waketime to moment of shot
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IF482.print(IF482_Out(now() + 1));
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#else // we need clock rescaling by software timer
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/*
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not yet implemented for IF482
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*/
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#endif
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}
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} // if482_loop()
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#endif // HAS_IF482
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