src/adafruit_blinka/microcontroller/nova/uart.py

   1 import time
   2
   3 class UART():
   4     ESCAPE_SEQUENCE = "+++UART0"
   5     def __init__(self,
   6                  portid,
   7                  baudrate=9600,
   8                  bits=8,
   9                  parity=None,
  10                  stop=1,
  11                  timeout=1000,
  12                  read_buf_len=None,
  13                  flow=None):
  14         from adafruit_blinka.microcontroller.nova import Connection
  15         self._nova = Connection.getInstance()
  16
  17         self._id = portid
  18         self._baudrate = baudrate
  19         self._parity = parity
  20         self._bits = bits
  21         self._stop = stop
  22         self._timeout = timeout
  23
  24         if flow is not None:  # default 0
  25             raise NotImplementedError(
  26                 "Parameter '{}' unsupported on Binho Nova".format(
  27                     "flow"))
  28
  29         self._nova.setOperationMode(self._id, 'UART')
  30         self._nova.setBaudRateUART(self._id, baudrate)
  31         self._nova.setDataBitsUART(self._id, bits)
  32         self._nova.setParityUART(self._id, parity)
  33         self._nova.setStopBitsUART(self._id, stop)
  34         self._nova.setEscapeSequenceUART(self._id, UART.ESCAPE_SEQUENCE)
  35         self._nova.beginBridgeUART(self._id)
  36
  37     def deinit(self):
  38         self._nova.writeBridgeUART(UART.ESCAPE_SEQUENCE)
  39         self._nova.stopBridgeUART(UART.ESCAPE_SEQUENCE)
  40
  41     def read(self, nbytes=None):
  42         if nbytes is None:
  43             return None
  44         data = bytearray()
  45         for i in range(nbytes):
  46             data.append(ord(self._nova.readBridgeUART()))
  47         return data
  48
  49     def readinto(self, buf, nbytes=None):
  50         if nbytes is None:
  51             return None
  52         for i in range(nbytes):
  53             buf.append(ord(self._nova.readBridgeUART()))
  54         return buf
  55
  56     def readline(self):
  57         out = self._nova.readBridgeUART()
  58         line = out
  59         while out != '\r':
  60             out = self._nova.readBridgeUART()
  61             line += out
  62         return line
  63
  64     def write(self, buf):
  65         return self._nova.writeBridgeUART(buf)