src/adafruit_blinka/microcontroller/nova/i2c.py

   1 """I2C Class for Binho Nova"""
   2
   3 from adafruit_blinka.microcontroller.nova import Connection
   4
   5
   6 class I2C:
   7     """Custom I2C Class for Binho Nova"""
   8
   9     def __init__(self, *, frequency=400000):
  10         self._nova = Connection.getInstance()
  11         self._nova.setNumericalBase(10)
  12         self._nova.setOperationMode(0, "I2C")
  13         self._nova.setPullUpStateI2C(0, "EN")
  14         self._nova.setClockI2C(0, frequency)
  15
  16     def scan(self):
  17         """Perform an I2C Device Scan"""
  18         scanResults = []
  19
  20         for i in range(8, 121):
  21             result = self._nova.scanAddrI2C(0, i << 1)
  22
  23             resp = result.split(" ")
  24
  25             if resp[3] == "OK":
  26                 scanResults.append(i)
  27
  28         return scanResults
  29
  30     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
  31         """Write data from the buffer to an address"""
  32         end = end if end else len(buffer)
  33
  34         self._nova.startI2C(0, address << 1)
  35
  36         for i in range(start, end):
  37             self._nova.writeByteI2C(0, buffer[i])
  38
  39         if stop:
  40             self._nova.endI2C(0)
  41         else:
  42             self._nova.endI2C(0, True)
  43
  44     def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
  45         """Read data from an address and into the buffer"""
  46         end = end if end else len(buffer)
  47
  48         result = self._nova.readBytesI2C(0, address << 1, len(buffer[start:end]))
  49
  50         if result != "-NG":
  51             resp = result.split(" ")
  52
  53             for i in range(len(buffer[start:end])):
  54                 buffer[start + i] = int(resp[2 + i])
  55         else:
  56             raise RuntimeError(
  57                 "Received error response from Binho Nova, result = " + result
  58             )
  59
  60     # pylint: disable=unused-argument
  61     def writeto_then_readfrom(
  62         self,
  63         address,
  64         buffer_out,
  65         buffer_in,
  66         *,
  67         out_start=0,
  68         out_end=None,
  69         in_start=0,
  70         in_end=None,
  71         stop=False
  72     ):
  73         """Write data from buffer_out to an address and then
  74         read data from an address and into buffer_in
  75         """
  76         out_end = out_end if out_end else len(buffer_out)
  77         in_end = in_end if in_end else len(buffer_in)
  78
  79         self._nova.startI2C(0, address << 1)
  80
  81         for i in range(out_start, out_end):
  82             self._nova.writeByteI2C(0, buffer_out[i])
  83
  84         self._nova.endI2C(0, True)
  85
  86         result = self._nova.readBytesI2C(
  87             0, address << 1, len(buffer_in[in_start:in_end])
  88         )
  89
  90         if result != "-NG":
  91             resp = result.split(" ")
  92
  93             for i in range(len(buffer_in[in_start:in_end])):
  94                 buffer_in[in_start + i] = int(resp[2 + i])
  95         else:
  96             raise RuntimeError(
  97                 "Received error response from Binho Nova, result = " + result
  98             )
  99
 100
 101 # pylint: enable=unused-argument