src/adafruit_blinka/microcontroller/pico_u2if/spi.py

   1 """SPI Class for Pico u2if"""
   2 from .pico_u2if import pico_u2if
   3
   4 # pylint: disable=protected-access, no-self-use
   5 class SPI:
   6     """Custom SPI Class for Pico u2if"""
   7
   8     MSB = 0
   9
  10     def __init__(self, clock, *, baudrate=100000):
  11         index = None
  12         if clock.id == 18:
  13             index = 0
  14         if clock.id == 10:
  15             index = 1
  16         if index is None:
  17             raise ValueError("No SPI port on specified pin.")
  18         self._index = index
  19         self._frequency = baudrate
  20         pico_u2if.spi_set_port(self._index)
  21         pico_u2if.spi_configure(self._frequency)
  22
  23     # pylint: disable=too-many-arguments,unused-argument
  24     def init(
  25         self,
  26         baudrate=1000000,
  27         polarity=0,
  28         phase=0,
  29         bits=8,
  30         firstbit=MSB,
  31         sck=None,
  32         mosi=None,
  33         miso=None,
  34     ):
  35         """Initialize the Port"""
  36         self._frequency = baudrate
  37         pico_u2if.spi_set_port(self._index)
  38         pico_u2if.spi_configure(self._frequency)
  39
  40     # pylint: enable=too-many-arguments
  41
  42     @property
  43     def frequency(self):
  44         """Return the current frequency"""
  45         return self._frequency
  46
  47     def write(self, buf, start=0, end=None):
  48         """Write data from the buffer to SPI"""
  49         pico_u2if.spi_write(buf, start=start, end=end)
  50
  51     def readinto(self, buf, start=0, end=None, write_value=0):
  52         """Read data from SPI and into the buffer"""
  53         pico_u2if.spi_readinto(buf, start=start, end=end, write_value=write_value)
  54
  55     # pylint: disable=too-many-arguments
  56     def write_readinto(
  57         self, buffer_out, buffer_in, out_start=0, out_end=None, in_start=0, in_end=None
  58     ):
  59         """Perform a half-duplex write from buffer_out and then
  60         read data into buffer_in
  61         """
  62         pico_u2if.spi_write_readinto(
  63             buffer_out,
  64             buffer_in,
  65             out_start=out_start,
  66             out_end=out_end,
  67             in_start=in_start,
  68             in_end=in_end,
  69         )
  70
  71     # pylint: enable=too-many-arguments