add uart

Author: junhuanchen

02.inputs/uart.py

@@ -0,0 +1,12 @@
+import time
+from machine import UART
+
+uart = UART(2)  # UART(2) RX16 TX17
+uart.init(57600, bits=8, parity=None, stop=1)
+
+while True:
+    recvlen = uart.any()
+    if recvlen > 0:
+        uart.write(uart.read(1))
+    # uart.write("hello\n")
+    # time.sleep(1)