Merge pull request 'Console: Update doco to point to `sdkconfig`, and handle no-stats cases.' (#257) from tursiae/tangara-fw:tasksconfig into main

Reviewed-on: https://codeberg.org/cool-tech-zone/tangara-fw/pulls/257

src/tangara/app_console/app_console.cpp

@@ -207,8 +207,14 @@ void RegisterDbInit() {
 
 int CmdTasks(int argc, char** argv) {
 #if (configUSE_TRACE_FACILITY == 0)
-  std::cout << "configUSE_TRACE_FACILITY must be enabled" << std::endl;
-  std::cout << "also consider configTASKLIST_USE_COREID" << std::endl;
+  std::cout
+    << "FreeRTOS is not configured to track task info." << std::endl
+    << "You can enable task tracing via sdkconfig, by setting" << std::endl
+    << "CONFIG_FREERTOS_USE_TRACE_FACILITY=y. Alternately, use" << std::endl
+    << "idf.py menuconfig to enable Components/FreeRTOS/Kernel" << std::endl
+    << "configUSE_TRACE_FACILITY to do the same." << std::endl << std::endl
+    << "Also consider 'Enable display of xCoreID in vTaskList'," << std::endl
+    << "or CONFIG_FREERTOS_VTASKLIST_INCLUDE_COREID=y" << std::endl;
   return 1;
 #endif
 
@@ -218,6 +224,14 @@ int CmdTasks(int argc, char** argv) {
     return 1;
   }
 
+  // Sample the task runtime percentage over 2.5 seconds if collecting
+  // task statistics. Else, we don't need to sample for as long.
+#ifdef CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS
+  const int kSamplePeriodMs = 2500;
+#else
+  const int kSamplePeriodMs = 10;
+#endif
+
   // Pad the number of tasks so that uxTaskGetSystemState still returns info
   // if new tasks are started during measurement.
   size_t num_tasks = uxTaskGetNumberOfTasks() + 4;
@@ -229,11 +243,23 @@ int CmdTasks(int argc, char** argv) {
   size_t start_num_tasks =
       uxTaskGetSystemState(start_status, num_tasks, &start_elapsed_ticks);
 
-  vTaskDelay(pdMS_TO_TICKS(2500));
+  vTaskDelay(pdMS_TO_TICKS(kSamplePeriodMs));
 
   size_t end_num_tasks =
       uxTaskGetSystemState(end_status, num_tasks, &end_elapsed_ticks);
 
+  uint32_t elapsed_ticks = end_elapsed_ticks - start_elapsed_ticks;
+
+  if (0 == elapsed_ticks) {
+    std::cout << "Warning: the scheduler is not recording run-time" << std::endl
+              << "statistics, and this means that detailed task" << std::endl
+              << "information is not available." << std::endl
+              << "Enable CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS" << std::endl
+              << "in sdkconfig to capture these stats, or via" << std::endl
+              << "idf.py menuconfig, in Components/FreeRTOS/Kernel" << std::endl
+              << "configGENERATE_RUN_TIME_STATS." << std::endl;
+  }
+
   std::vector<std::pair<uint32_t, std::pmr::string>> info_strings;
   for (int i = 0; i < start_num_tasks; i++) {
     int k = -1;
@@ -279,8 +305,12 @@ int CmdTasks(int argc, char** argv) {
         str << "\t\t";
       }
 
+#ifdef CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS
       str << std::fixed << std::setprecision(1) << (time_percent * 100);
       str << "%";
+#else
+      str << "(unavailable)";
+#endif
 
       info_strings.push_back({run_time, std::pmr::string{str.str()}});
     }