src/adafruit_blinka/microcontroller/nxp_lpc4330/uart.py

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