added IF482 time telegram generator (experimental)

include/if482.h

@@ -2,5 +2,9 @@
 #define _IF482_H
 
 #include "globals.h"
+#include "irqhandler.h"
+
+void if482_init(void);
+void sendIF482(time_t t);
 
 #endif

include/irqhandler.h

@@ -5,6 +5,7 @@
 #define BUTTON_IRQ 0x02
 #define SENDCOUNTER_IRQ 0x04
 #define CYCLIC_IRQ 0x08
+#define IF482_IRQ 0x10
 
 #include "globals.h"
 #include "cyclic.h"
@@ -25,4 +26,10 @@ void IRAM_ATTR DisplayIRQ();
 void IRAM_ATTR ButtonIRQ();
 #endif
 
+#ifdef HAS_IF482
+#include "if482.h"
+void IRAM_ATTR IF482IRQ();
+#endif
+
+
 #endif

include/rtctime.h

@@ -18,6 +18,8 @@ typedef enum {
   synced_GPS = 4   // best possible quality, clock is driven by GPS
 } clock_state_t;
 
+extern RtcDS3231<TwoWire> Rtc; // make RTC instance globally available
+
 int rtc_init(void);
 void sync_rtctime(void);
 int set_rtctime(uint32_t UTCTime);

src/hal/ttgofox.h

@@ -10,7 +10,6 @@
 
 #define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C
 #define HAS_LED NOT_A_PIN // green on board LED is useless, is GPIO25, which switches power for Lora+Display
-//#define LED_ACTIVE_LOW 1  // Onboard LED is active when pin is LOW
 #define HAS_LOWPOWER_SWITCH GPIO_NUM_25 // switches power for LoRa chip + display (0 = off / 1 = on)
 #define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL
 #define BATT_FACTOR 2 // voltage divider 100k/100k on board
@@ -23,6 +22,11 @@
 
 // Pins for on board DS3231 RTC chip
 #define HAS_RTC MY_OLED_SDA, MY_OLED_SCL // SDA, SCL
+#define RTC_INT GPIO_NUM_34 // interrupt input from rtc
+
+// Settings for IF482 interface
+#define HAS_IF482 9600, SERIAL_7E1, GPIO_NUM_12, GPIO_NUM_15 // IF482 serial port parameters
+#define IF482_PORT 1 // serial port 1
 
 // Pins for LORA chip SPI interface, reset line and interrupt lines
 #define LORA_SCK  (5) 

src/if482.cpp

@@ -1,6 +1,7 @@
-#ifdef HAS_IF482
+#if defined HAS_IF482 && defined HAS_RTC
 
 /*
+
 IF482 Generator to control clocks with IF482 timeframe input (e.g. BÜRK BU190)
    
 Example IF482 timeframe: "OAL160806F170400"
@@ -51,5 +52,64 @@ Wird überprüft, jedoch nicht vom Uhrwerk ausgewertet.
 // Local logging tag
 static const char TAG[] = "main";
 
+HardwareSerial IF482(IF482_PORT); // serial port 1
+
+// initialize and configure GPS
+void if482_init(void) {
+
+  IF482.begin(HAS_IF482);
+  ESP_LOGI(TAG, "IF482 serial port opened");
+
+  // use rtc 1Hz clock for triggering IF482 telegram send
+  Rtc.SetSquareWavePinClockFrequency(DS3231SquareWaveClock_1Hz);
+  Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeClock);
+
+  // setup external interupt for active low RTC INT pin
+  attachInterrupt(RTC_INT, IF482IRQ, FALLING);
+
+} // if482_init
+
+char * if482Telegram(time_t t) {
+
+  static char out[17] = {0}; // 16 bytes IF482 telegram plus null termination char
+  char buf[14] = {0};
+
+  strcat_P(out, "O"); // <STX>
+
+  switch (timeStatus()) { // indicates if time has been set and recently synced
+
+  case timeSet: // time is set and is synced
+    strcat_P(out, "A");
+    break;
+
+  case timeNeedsSync: // time had been set but sync attempt did not succeed
+    strcat_P(out, "M");
+    break;
+
+  default: // time not set, no valid time
+    strcat_P(out, "?");
+    break;
+
+  } // switch
+
+  strcat_P(out, "L"); // local time
+
+  if (!timeNotSet) { // do we have valid time?
+    sprintf(buf, "%02u%02u%02uF%02u%02u%02u", year(t), month(t), day(t), hour(t),
+            minute(t), second(t));
+    strcat(out, buf);
+  } else {
+    strcat_P(out, "000000F000000");
+  }
+
+  strcat_P(out, "\r"); // <ETX>
+
+  return out;
+}
+
+// interrupt triggered routine
+void sendIF482(time_t t) {
+        IF482.write(if482Telegram(t));
+}
 
 #endif // HAS_IF482

src/irqhandler.cpp

@@ -18,6 +18,12 @@ void irqHandler(void *pvParameters) {
         &InterruptStatus, // Receives the notification value
         portMAX_DELAY);   // wait forever (missing error handling here...)
 
+// IF482 interrupt?
+#ifdef HAS_IF482
+    if (InterruptStatus & IF482_IRQ)
+      sendIF482(now());
+#endif
+
 // button pressed?
 #ifdef HAS_BUTTON
     if (InterruptStatus & BUTTON_IRQ)
@@ -72,3 +78,10 @@ void IRAM_ATTR ButtonIRQ() {
   portYIELD_FROM_ISR();
 }
 #endif
+
+#ifdef HAS_IF482
+void IRAM_ATTR IF482IRQ() {
+  xTaskNotifyFromISR(irqHandlerTask, IF482_IRQ, eSetBits, NULL);
+  portYIELD_FROM_ISR();
+}
+#endif

src/rtctime.cpp

@@ -42,6 +42,7 @@ int rtc_init(void) {
     // configure RTC chip
     Rtc.Enable32kHzPin(false);
     Rtc.SetSquareWavePin(DS3231SquareWavePin_ModeNone);
+
   } else {
     ESP_LOGE(TAG, "I2c bus busy - RTC initialization error");
     goto error;