boardd: new function sync_time (#23033)

* sync_time

* add direction

* Update selfdrive/boardd/boardd.cc

Co-authored-by: Willem Melching <willem.melching@gmail.com>

* enum class

* rename

* caps

* lambda get_time_str

* Revert "lambda get_time_str"

This reverts commit 5eb6e19c51.

* static

Co-authored-by: Willem Melching <willem.melching@gmail.com>
old-commit-hash: 35c0319f6c

selfdrive/boardd/boardd.cc

@@ -62,7 +62,7 @@ std::atomic<bool> pigeon_active(false);
 
 ExitHandler do_exit;
 
-std::string get_time_str(const struct tm &time) {
+static std::string get_time_str(const struct tm &time) {
   char s[30] = {'\0'};
   std::strftime(s, std::size(s), "%Y-%m-%d %H:%M:%S", &time);
   return s;
@@ -78,6 +78,35 @@ bool check_all_connected(const std::vector<Panda *> &pandas) {
   return true;
 }
 
+enum class SyncTimeDir { TO_PANDA, FROM_PANDA };
+
+void sync_time(Panda *panda, SyncTimeDir dir) {
+  if (!panda->has_rtc) return;
+
+  setenv("TZ", "UTC", 1);
+  struct tm sys_time = util::get_time();
+  struct tm rtc_time = panda->get_rtc();
+
+  if (dir == SyncTimeDir::TO_PANDA) {
+    if (util::time_valid(sys_time)) {
+      // Write time to RTC if it looks reasonable
+      double seconds = difftime(mktime(&rtc_time), mktime(&sys_time));
+      if (std::abs(seconds) > 1.1) {
+        panda->set_rtc(sys_time);
+        LOGW("Updating panda RTC. dt = %.2f System: %s RTC: %s",
+              seconds, get_time_str(sys_time).c_str(), get_time_str(rtc_time).c_str());
+      }
+    }
+  } else if (dir == SyncTimeDir::FROM_PANDA) {
+    if (!util::time_valid(sys_time) && util::time_valid(rtc_time)) {
+      const struct timeval tv = {mktime(&rtc_time), 0};
+      settimeofday(&tv, 0);
+      LOGE("System time wrong, setting from RTC. System: %s RTC: %s",
+           get_time_str(sys_time).c_str(), get_time_str(rtc_time).c_str());
+    }
+  }
+}
+
 bool safety_setter_thread(std::vector<Panda *> pandas) {
   LOGD("Starting safety setter thread");
 
@@ -171,19 +200,7 @@ Panda *usb_connect(std::string serial="", uint32_t index=0) {
   std::call_once(connected_once, &Panda::set_usb_power_mode, panda, cereal::PeripheralState::UsbPowerMode::CDP);
 #endif
 
-  if (panda->has_rtc) {
-    setenv("TZ","UTC",1);
-    struct tm sys_time = util::get_time();
-    struct tm rtc_time = panda->get_rtc();
-
-    if (!util::time_valid(sys_time) && util::time_valid(rtc_time)) {
-      LOGE("System time wrong, setting from RTC. System: %s RTC: %s",
-           get_time_str(sys_time).c_str(), get_time_str(rtc_time).c_str());
-      const struct timeval tv = {mktime(&rtc_time), 0};
-      settimeofday(&tv, 0);
-    }
-  }
-
+  sync_time(panda.get(), SyncTimeDir::FROM_PANDA);
   return panda.release();
 }
 
@@ -516,21 +533,8 @@ void peripheral_control_thread(Panda *panda) {
     }
 
     // Write to rtc once per minute when no ignition present
-    if ((panda->has_rtc) && !ignition && (cnt % 120 == 1)) {
-      // Write time to RTC if it looks reasonable
-      setenv("TZ","UTC",1);
-      struct tm sys_time = util::get_time();
-
-      if (util::time_valid(sys_time)) {
-        struct tm rtc_time = panda->get_rtc();
-        double seconds = difftime(mktime(&rtc_time), mktime(&sys_time));
-
-        if (std::abs(seconds) > 1.1) {
-          panda->set_rtc(sys_time);
-          LOGW("Updating panda RTC. dt = %.2f System: %s RTC: %s",
-                seconds, get_time_str(sys_time).c_str(), get_time_str(rtc_time).c_str());
-        }
-      }
+    if (!ignition && (cnt % 120 == 1)) {
+      sync_time(panda, SyncTimeDir::TO_PANDA);
     }
   }
 }