src/adafruit_blinka/microcontroller/generic_micropython/spi.py

   1 """SPI Class for Generic MicroPython"""
   2 from machine import SPI as _SPI
   3
   4 # pylint: disable=protected-access, no-self-use
   5 class SPI:
   6     """SPI Class for Generic MicroPython"""
   7
   8     MSB = _SPI.MSB
   9     LSB = _SPI.LSB
  10
  11     def __init__(self, portId, baudrate=100000):
  12         self._frequency = baudrate
  13         self._spi = _SPI(portId)
  14
  15     # pylint: disable=too-many-arguments,unused-argument
  16     def init(
  17         self,
  18         baudrate=1000000,
  19         polarity=0,
  20         phase=0,
  21         bits=8,
  22         firstbit=_SPI.MSB,
  23     ):
  24         """Initialize the Port"""
  25         self._frequency = baudrate
  26         self._spi.init(
  27             baudrate=baudrate,
  28             polarity=polarity,
  29             phase=phase,
  30             bits=bits,
  31             firstbit=firstbit,
  32             mode=_SPI.MASTER,
  33         )
  34
  35     # pylint: enable=too-many-arguments
  36
  37     @property
  38     def frequency(self):
  39         """Return the current frequency"""
  40         return self._frequency
  41
  42     def write(self, buf, start=0, end=None):
  43         """Write data from the buffer to SPI"""
  44         self._spi.write(buf)
  45
  46     def readinto(self, buf, start=0, end=None, write_value=0):
  47         """Read data from SPI and into the buffer"""
  48         self._spi.readinto(buf)
  49
  50     # pylint: disable=too-many-arguments
  51     def write_readinto(
  52         self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None
  53     ):
  54         """Perform a half-duplex write from buffer_out and then
  55         read data into buffer_in
  56         """
  57         self._spi.write_readinto(
  58             buffer_out,
  59             buffer_in,
  60             out_start=out_start,
  61             out_end=out_end,
  62             in_start=in_start,
  63             in_end=in_end,
  64         )
  65
  66     # pylint: enable=too-many-arguments