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