src/adafruit_blinka/microcontroller/nxp_lpc4330/uart.py

   1 # SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
   2 #
   3 # SPDX-License-Identifier: MIT
   4 """UART Class for NXP LPC4330"""
   5 from greatfet import GreatFET
   6 from greatfet.interfaces.uart import UART as _UART
   7
   8
   9 class UART:
  10     """Custom UART Class for NXP LPC4330"""
  11
  12     PARITY_NONE = 0
  13     PARITY_ODD = 1
  14     PARITY_EVEN = 2
  15     PARITY_STUCK_AT_ONE = 3
  16     PARITY_STUCK_AT_ZERO = 4
  17
  18     # pylint: disable=too-many-arguments,unused-argument
  19     def __init__(
  20         self,
  21         portid,
  22         baudrate=9600,
  23         bits=8,
  24         parity=None,
  25         stop=1,
  26         timeout=1000,
  27         read_buf_len=None,
  28         flow=None,
  29     ):
  30         self._gf = GreatFET()
  31         self._uart = _UART(
  32             self._gf,
  33             baud=baudrate,
  34             data_bits=bits,
  35             stop_bits=stop,
  36             parity=parity,
  37             uart_number=portid,
  38         )
  39
  40         if flow is not None:  # default None
  41             raise NotImplementedError(
  42                 "Parameter '{}' unsupported on GreatFET One".format("flow")
  43             )
  44
  45     # pylint: enable=too-many-arguments,unused-argument
  46
  47     def deinit(self):
  48         """Deinitialize"""
  49         self._uart.initialized = False
  50
  51     def read(self, nbytes=None):
  52         """Read data from UART and return it"""
  53         if nbytes is None:
  54             return None
  55         return self._uart.read(nbytes)
  56
  57     def readinto(self, buf, nbytes=None):
  58         """Read data from UART and into the buffer"""
  59         if nbytes is None:
  60             return None
  61         result = self.read(nbytes)
  62         for _ in range(nbytes):
  63             buf.append(result)
  64         return buf
  65
  66     def readline(self):
  67         """Read a single line of data from UART"""
  68         out = self.read(nbytes=1)
  69         line = out
  70         while out != "\r":
  71             out = self.read(nbytes=1)
  72             line += out
  73         return line
  74
  75     def write(self, buf):
  76         """Write data from the buffer to UART"""
  77         return self._uart.write(buf)