timekeeper fixes (experimental)

src/dcf77.cpp

@@ -22,6 +22,8 @@ void DCF77_Pulse(time_t t, uint8_t const *DCFpulse) {
   TickType_t startTime = xTaskGetTickCount();
   uint8_t sec = second(t);
 
+  ESP_LOGD (TAG, "DCF second %d", sec);
+
   // induce 10 pulses
   for (uint8_t pulse = 0; pulse <= 9; pulse++) {
 

src/gpsread.cpp

@@ -92,9 +92,9 @@ time_t get_gpstime(void) {
 
   time_t t = 0;
 
-  if ((gps.time.age() < gpsDelay_ms) && (gps.time.isValid())) {
+  if ((gps.time.age() < gpsDelay_ms) && (gps.time.isValid()) && (gps.date.isValid())) {
 
-    ESP_LOGD(TAG, "GPS time age: %dms, is valid: %s", gps.time.age(),
+      ESP_LOGD(TAG, "GPS time age: %dms, second: %d, is valid: %s", gps.time.age(), gps.time.second(),
                gps.time.isValid() ? "yes" : "no");
 
       t = tmConvert(gps.date.year(), gps.date.month(), gps.date.day(),

src/main.cpp

@@ -27,11 +27,11 @@ Uused tasks and timers:
 
 Task          Core  Prio  Purpose
 ====================================================================================
-clockloop     0     4     generates realtime telegrams for external clock
 ledloop       0     3     blinks LEDs
 spiloop       0     2     reads/writes data on spi interface
 IDLE          0     0     ESP32 arduino scheduler -> runs wifi sniffer
 
+clockloop     1     4     generates realtime telegrams for external clock
 looptask      1     1     arduino core -> runs the LMIC LoRa stack
 irqhandler    1     1     executes tasks triggered by hw irq, see table below
 gpsloop       1     2     reads data from GPS via serial or i2c
@@ -362,7 +362,6 @@ void setup() {
   ESP_LOGI(TAG, "Starting Timekeeper...");
   assert(timepulse_init()); // setup timepulse
   timepulse_start();
-  timeSync();
 
   // start wifi in monitor mode and start channel rotation timer
   ESP_LOGI(TAG, "Starting Wifi...");
@@ -417,6 +416,7 @@ void setup() {
 
 #if defined HAS_IF482 || defined HAS_DCF77
   ESP_LOGI(TAG, "Starting Clock Controller...");
+  timeSync();
   clock_init();
 #endif
 

src/timekeeper.cpp

@@ -8,7 +8,6 @@ const char timeSetSymbols[] = {'G', 'R', 'L', '?'};
 
 getExternalTime TimeSourcePtr; // pointer to time source function
 
-
 // syncs systime from external time source and sets/reads RTC, called by
 // cyclic.cpp
 void timeSync(void) {
@@ -16,22 +15,17 @@ void timeSync(void) {
   time_t t = 0;
 
 #ifdef HAS_GPS
-    // do we have a valid GPS time?
+  xSemaphoreTake(TimePulse, pdMS_TO_TICKS(1100)); // wait for pps
-    if (get_gpstime()) { // then let's sync GPS time on top of second
+  t = get_gpstime(); // fetch recent time from last NEMA record
-
-      xSemaphoreTake(TimePulse, pdMS_TO_TICKS(1000)); // wait for pps
-      vTaskDelay(gpsDelay_ticks);
-      t = get_gpstime(); // fetch time from recent NEMA record
   if (t) {
-        t++; // gps time concerns past second, so we add one
+    / t++; // last NMEA record concerns past second, so we add one
-        xSemaphoreTake(TimePulse, pdMS_TO_TICKS(1000)); // wait for pps
+    ESP_LOGD(TAG, "millis: %d, second: %d", millis(), second(t));
     setTime(t);
 #ifdef HAS_RTC
     set_rtctime(t); // calibrate RTC
 #endif
     timeSource = _gps;
-        goto exit;
+    return;
-      }
   }
 #endif
 
@@ -41,8 +35,7 @@ void timeSync(void) {
   if (t) {
     setTime(t);
     timeSource = _rtc;
-    } else
+  }
-      ESP_LOGW(TAG, "no confident RTC time");
 #endif
 
 // try lora sync if we have
@@ -50,12 +43,7 @@ void timeSync(void) {
   LMIC_requestNetworkTime(user_request_network_time_callback, &userUTCTime);
 #endif
 
-exit:
+  if (!t)
-
-    if (t)
-      ESP_LOGD(TAG, "Time was set by %c to %02d:%02d:%02d",
-               timeSetSymbols[timeSource], hour(t), minute(t), second(t));
-    else
     timeSource = _unsynced;
 
 } // timeSync()
@@ -66,7 +54,7 @@ uint8_t timepulse_init() {
 // use time pulse from GPS as time base with fixed 1Hz frequency
 #ifdef GPS_INT
 
-  // setup external interupt pin for GPS INT output
+  // setup external interupt pin for rising edge GPS INT
   pinMode(GPS_INT, INPUT_PULLDOWN);
   // setup external rtc 1Hz clock as pulse per second clock
   ESP_LOGI(TAG, "Timepulse: external (GPS)");
@@ -75,7 +63,7 @@ uint8_t timepulse_init() {
 // use pulse from on board RTC chip as time base with fixed frequency
 #elif defined RTC_INT
 
-  // setup external interupt pin for active low RTC INT output
+  // setup external interupt pin for falling edge RTC INT
   pinMode(RTC_INT, INPUT_PULLUP);
 
   // setup external rtc 1Hz clock as pulse per second clock
@@ -114,12 +102,15 @@ void timepulse_start(void) {
 
 // interrupt service routine triggered by either pps or esp32 hardware timer
 void IRAM_ATTR CLOCKIRQ(void) {
+
   if (ClockTask != NULL)
-    xTaskNotifyFromISR(ClockTask, xTaskGetTickCountFromISR(), eSetBits, NULL);
+    xTaskNotifyFromISR(ClockTask, uint32_t(now()), eSetBits, NULL);
+
 #if defined GPS_INT || defined RTC_INT
-  xSemaphoreGiveFromISR(TimePulse, NULL);
+  xSemaphoreGiveFromISR(TimePulse, &xHigherPriorityTaskWoken);
   TimePulseTick = !TimePulseTick; // flip ticker
 #endif
+
   portYIELD_FROM_ISR();
 }
 
@@ -181,7 +172,7 @@ void clock_init(void) {
                           (void *)1,   // task parameter
                           4,           // priority of the task
                           &ClockTask,  // task handle
-                          0);          // CPU core
+                          1);          // CPU core
 
   assert(ClockTask); // has clock task started?
 } // clock_init
@@ -191,10 +182,11 @@ void clock_loop(void *pvParameters) { // ClockTask
   configASSERT(((uint32_t)pvParameters) == 1); // FreeRTOS check
 
   TickType_t wakeTime;
+  uint32_t ppstime;
   time_t t;
 
-#define t1(t) (t + DCF77_FRAME_SIZE + 1) // future time for next DCF77 frame
+#define t1(t) (t + DCF77_FRAME_SIZE + 1) // future minute for next DCF77 frame
-#define t2(t) (t + 1) // future time for sync with 1pps trigger
+#define t2(t) (t + 1) // future second after sync with 1pps trigger
 
   // preload first DCF frame before start
 #ifdef HAS_DCF77
@@ -204,14 +196,14 @@ void clock_loop(void *pvParameters) { // ClockTask
 
   // output time telegram for second following sec beginning with timepulse
   for (;;) {
-    xTaskNotifyWait(0x00, ULONG_MAX, &wakeTime,
+    xTaskNotifyWait(0x00, ULONG_MAX, &ppstime,
                     portMAX_DELAY); // wait for timepulse
 
     // no confident time -> suppress clock output
     if (timeStatus() == timeNotSet)
       continue;
 
-    t = now(); // payload to send to clock
+    t = time_t(ppstime);
 
 #if defined HAS_IF482
 
@@ -222,8 +214,10 @@ void clock_loop(void *pvParameters) { // ClockTask
     if (second(t) == DCF77_FRAME_SIZE - 1) // is it time to load new frame?
       DCFpulse = DCF77_Frame(t1(t));       // generate next frame
 
-    if (DCFpulse[DCF77_FRAME_SIZE] ==
+    if (DCFpulse[DCF77_FRAME_SIZE] !=
-        minute(t1(t))) // have recent frame? (pulses could be missed!)
+        minute(t1(t))) // have recent frame? (timepulses could be missed!)
+      continue;
+    else
       DCF77_Pulse(t2(t), DCFpulse); // then output next second of this frame
 
 #endif