real field test

test.py

@@ -0,0 +1,67 @@
+from machine import UART, Pin
+import time
+
+CANDIDATES = [4, 12, 13, 14, 16, 17, 21, 22, 23, 25, 26, 27, 32, 33]
+
+BAUDRATES = [921600]
+
+HEADER = 0x55  # IMU WIT frame header
+
+def test_uart(rx, tx, baud):
+    try:
+        uart = UART(
+            2,
+            baudrate=baud,
+            rx=Pin(rx),
+            tx=Pin(tx),
+            timeout=100,
+            rxbuf=1024
+        )
+
+        time.sleep(0.1)
+
+        start = time.ticks_ms()
+        samples = []
+
+        while time.ticks_diff(time.ticks_ms(), start) < 1000:
+            if uart.any():
+                data = uart.read()
+                if data:
+                    samples.append(data)
+
+        uart.deinit()
+
+        # 合并所有数据
+        if samples:
+            merged = b''.join(samples)
+
+            print(f"\nRX={rx}, TX={tx}, BAUD={baud}")
+            print("RAW HEX:", merged[:80])  # 前80字节
+            print("HEX:", merged[:80].hex())
+
+            return merged
+        else:
+            return b""
+
+    except Exception as e:
+        return b""
+
+print("=== UART PIN SCAN START ===")
+
+best = (0, None, None, None)
+
+for rx in CANDIDATES:
+    for tx in CANDIDATES:
+        if rx == tx:
+            continue
+
+        for baud in BAUDRATES:
+            c, t = test_uart(rx, tx, baud)
+
+            print(f"RX={rx}, TX={tx}, BAUD={baud} -> 0x55={c}, bytes={t}")
+
+            if c > best[0]:
+                best = (c, rx, tx, baud)
+
+print("\n=== BEST MATCH ===")
+print(best)