src/adafruit_blinka/microcontroller/rp2040_u2if/i2c.py

   1 """I2C Classes for RP2040s with u2if firmware"""
   2 from .rp2040_u2if import rp2040_u2if
   3
   4
   5 class I2C:
   6     """I2C Base Class for RP2040 u2if"""
   7
   8     def __init__(self, index, *, frequency=100000):
   9         self._index = index
  10         rp2040_u2if.i2c_set_port(self._index)
  11         rp2040_u2if.i2c_configure(frequency)
  12
  13     def scan(self):
  14         """Perform an I2C Device Scan"""
  15         rp2040_u2if.i2c_set_port(self._index)
  16         return rp2040_u2if.i2c_scan()
  17
  18     # pylint: disable=unused-argument
  19     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
  20         """Write data from the buffer to an address"""
  21         rp2040_u2if.i2c_set_port(self._index)
  22         rp2040_u2if.i2c_writeto(address, buffer, start=start, end=end)
  23
  24     def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
  25         """Read data from an address and into the buffer"""
  26         rp2040_u2if.i2c_set_port(self._index)
  27         rp2040_u2if.i2c_readfrom_into(address, buffer, start=start, end=end)
  28
  29     def writeto_then_readfrom(
  30         self,
  31         address,
  32         buffer_out,
  33         buffer_in,
  34         *,
  35         out_start=0,
  36         out_end=None,
  37         in_start=0,
  38         in_end=None,
  39         stop=False
  40     ):
  41         """Write data from buffer_out to an address and then
  42         read data from an address and into buffer_in
  43         """
  44         rp2040_u2if.i2c_set_port(self._index)
  45         rp2040_u2if.i2c_writeto_then_readfrom(
  46             address,
  47             buffer_out,
  48             buffer_in,
  49             out_start=out_start,
  50             out_end=out_end,
  51             in_start=in_start,
  52             in_end=in_end,
  53         )
  54
  55     # pylint: enable=unused-argument
  56
  57 class I2C_Pico(I2C):
  58     """I2C Class for Pico u2if"""
  59
  60     def __init__(self, scl, sda, *, frequency=100000):
  61         index = None
  62         if scl.id == 5 and sda.id == 4:
  63             index = 0
  64         if scl.id == 15 and sda.id == 14:
  65             index = 1
  66         if index is None:
  67             raise ValueError("I2C not found on specified pins.")
  68         self._index = index
  69
  70         super().__init__(index, frequency=frequency)
  71
  72 class I2C_Feather(I2C):
  73     """I2C Class for Feather u2if"""
  74
  75     def __init__(self, scl, sda, *, frequency=100000):
  76         index = None
  77         if scl.id == 3 and sda.id == 2:
  78             index = 1
  79         if index is None:
  80             raise ValueError("I2C not found on specified pins.")
  81         self._index = index
  82
  83         super().__init__(index, frequency=frequency)
  84