features/unit/RS485 is a TTL to RS485 convertor

Author: pandiannano

m5stack/libs/unit/rs485.py

@@ -0,0 +1,32 @@
+from driver.modbus.master.uSerial import uSerial
+
+class RS485(uSerial):
+
+    def __init__(self, port, debug=False):
+        self._port = port
+        self._debug = debug
+
+    def init(self, uart, tx_pin=17, rx_pin=18, baudrate=9600, data_bits=8, stop_bits=1, parity=None, ctrl_pin=None):
+        if tx_pin != None and rx_pin != None:
+            self._port = (rx_pin, tx_pin)
+        if data_bits == None and stop_bits == None:
+            data_bits=8
+            stop_bits=1
+        super().__init__(uart, tx=self._port[1], rx=self._port[0], baudrate=baudrate, data_bits=data_bits, parity=parity,
+                         stop_bits=stop_bits, ctrl_pin=ctrl_pin, debug=self._debug)
+
+    def write(self, payload):
+        self._mdbus_uart.write(payload)
+
+    def read(self, byte=None):
+        if byte is not None:
+            return self._mdbus_uart.read(byte)
+        else:
+            return self._mdbus_uart.read()
+
+    def readline(self):
+        return self._mdbus_uart.readline()
+
+    def any(self):
+        return self._mdbus_uart.any()
+