utop: Add initial implementation for ESP32.

Signed-off-by: Daniël van de Giessen <[email protected]>

Author: DvdGiessen

Diff for: micropython/utop/README.md

@@ -0,0 +1,12 @@
+# utop
+
+Provides a top-like live overview of the running system.
+
+On the `esp32` port this depends on the `esp32.idf_task_stats()` function, which
+can be enabled by adding the following lines to the board `sdkconfig`:
+
+```ini
+CONFIG_FREERTOS_USE_TRACE_FACILITY=y
+CONFIG_FREERTOS_VTASKLIST_INCLUDE_COREID=y
+CONFIG_FREERTOS_GENERATE_RUN_TIME_STATS=y
+```

Diff for: micropython/utop/manifest.py

@@ -0,0 +1,6 @@
+metadata(
+    version="0.1.0",
+    description="Provides a top-like live overview of the running system.",
+)
+
+module("utop.py")

Diff for: micropython/utop/utop.py

@@ -0,0 +1,86 @@
+import gc
+import time
+
+try:
+    import esp32
+except ImportError:
+    esp32 = None
+
+
+def top(update_interval_ms=1000, timeout_ms=None):
+    time_start = time.ticks_ms()
+    previous_total_runtime = None
+    previous_task_runtimes = {}
+    previous_line_count = 0
+    esp32_task_state_names = ("running", "ready", "blocked", "suspended", "deleted", "invalid")
+
+    while timeout_ms is None or abs(time.ticks_diff(time.ticks_ms(), time_start)) < timeout_ms:
+        if previous_line_count > 0:
+            print("\x1B[{}A".format(previous_line_count), end="")
+        line_count = 0
+
+        if esp32 is not None:
+            if not hasattr(esp32, "idf_task_stats"):
+                print(
+                    "INFO: esp32.idf_task_stats() is not available, cannot list active tasks.\x1B[K"
+                )
+                line_count += 1
+            else:
+                print("   CPU%  CORE  PRIORITY  STATE      STACKWATERMARK  NAME\x1B[K")
+                line_count += 1
+
+                total_runtime, tasks = esp32.idf_task_stats()
+                tasks.sort(key=lambda t: t[1])
+                for (
+                    task_name,
+                    task_id,
+                    task_state,
+                    task_priority,
+                    task_runtime,
+                    task_stackhighwatermark,
+                    task_coreid,
+                ) in tasks:
+                    task_runtime_percentage = "-"
+                    if total_runtime > 0:
+                        if (
+                            previous_total_runtime is not None
+                            and task_id in previous_task_runtimes
+                        ):
+                            task_cpu_percentage = (
+                                100
+                                * (task_runtime - previous_task_runtimes[task_id])
+                                / (total_runtime - previous_total_runtime)
+                            )
+                        else:
+                            task_cpu_percentage = 100 * task_runtime / total_runtime
+                        task_runtime_percentage = "{:.2f}%".format(task_cpu_percentage)
+                    task_state_name = "unknown"
+                    if task_state >= 0 and task_state < len(esp32_task_state_names):
+                        task_state_name = esp32_task_state_names[task_state]
+
+                    print(
+                        "{:>7}  {:>4d}  {:>8d}  {:<9}  {:<14d}  {}\x1B[K".format(
+                            task_runtime_percentage,
+                            task_coreid,
+                            task_priority,
+                            task_state_name,
+                            task_stackhighwatermark,
+                            task_name,
+                        )
+                    )
+                    line_count += 1
+
+                    previous_task_runtimes[task_id] = task_runtime
+        else:
+            print("INFO: Platform does not support listing active tasks.\x1B[K")
+            line_count += 1
+
+        if previous_line_count > line_count:
+            for _ in range(previous_line_count - line_count):
+                print("\x1B[K")
+            print("\x1B[{}A".format(previous_line_count - line_count), end="")
+
+        previous_total_runtime = total_runtime
+        previous_line_count = line_count
+
+        time.sleep_ms(update_interval_ms)