utop: Add initial implementation for ESP32.

Signed-off-by: Daniël van de Giessen <daniel@dvdgiessen.nl>

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_info()` 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
+```

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")

micropython/utop/utop.py

@@ -0,0 +1,85 @@
+import time
+
+try:
+    import esp32
+    import _thread
+except ImportError:
+    esp32 = None
+
+
+def top(update_interval_ms=1000, timeout_ms=None, thread_names={}):
+    time_start = time.ticks_ms()
+    previous_total_runtime = None
+    previous_task_runtimes = {}
+    previous_line_count = 0
+    esp32_task_state_names = dict(
+        enumerate(("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_info"):
+                print(
+                    "INFO: esp32.idf_task_info() 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_info()
+                current_thread_id = _thread.get_ident()
+                tasks.sort(key=lambda t: t[0])
+                for (
+                    task_id,
+                    task_name,
+                    task_state,
+                    task_priority,
+                    task_runtime,
+                    task_stackhighwatermark,
+                    task_coreid,
+                ) in tasks:
+                    task_runtime_percentage = "-"
+                    if (
+                        total_runtime != previous_total_runtime
+                        and task_id in previous_task_runtimes
+                    ):
+                        task_runtime_percentage = "{:.2f}%".format(
+                            100
+                            * ((task_runtime - previous_task_runtimes[task_id]) & (2**32 - 1))
+                            / ((total_runtime - previous_total_runtime) & (2**32 - 1))
+                        )
+                    print(
+                        "{:>7}  {:>4}  {:>8d}  {:<9}  {:<14d}  {}{}\x1b[K".format(
+                            task_runtime_percentage,
+                            "-" if task_coreid is None else task_coreid,
+                            task_priority,
+                            esp32_task_state_names.get(task_state, "unknown"),
+                            task_stackhighwatermark,
+                            thread_names.get(task_id, task_name),
+                            " (*)" if task_id == current_thread_id else "",
+                        )
+                    )
+                    line_count += 1
+
+                    previous_task_runtimes[task_id] = task_runtime
+                previous_total_runtime = total_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_line_count = line_count
+
+        try:
+            time.sleep_ms(update_interval_ms)
+        except KeyboardInterrupt:
+            break