src/adafruit_blinka/microcontroller/nova/i2c.py

   1 #from adafruit_blinka.microcontroller.nova.pin import Pin
   2
   3 class I2C:
   4
   5     def __init__(self):
   6         # change GPIO controller to I2C
   7         from binhoHostAdapter import binhoHostAdapter
   8         from binhoHostAdapter import binhoUtilities
   9
  10         utilities = binhoUtilities.binhoUtilities()
  11         devices = utilities.listAvailableDevices()
  12
  13         if len(devices) > 0:
  14
  15             self._nova = binhoHostAdapter.binhoHostAdapter(devices[0])
  16             self._nova.setNumericalBase(10)
  17             self._nova.setOperationMode(0, "I2C")
  18             self._nova.setPullUpStateI2C(0, "EN")
  19             self._nova.setClockI2C(0, 400000)
  20
  21         else:
  22             raise RuntimeError('No Binho host adapter found!')
  23
  24         # Pin.ft232h_gpio = self._i2c.get_gpio()
  25
  26     def scan(self):
  27
  28         scanResults = []
  29
  30         for i in range(8, 121):
  31             result = self._nova.scanAddrI2C(0, i<<1)
  32
  33             resp = result.split(" ")
  34
  35             if resp[3] == 'OK':
  36                 scanResults.append(i)
  37
  38         return scanResults
  39
  40     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
  41
  42         end = end if end else len(buffer)
  43
  44         self._nova.startI2C(0, address)
  45
  46         for i in range(start, end):
  47             self._nova.writeByteI2C(0, buffer[i])
  48
  49         if stop:
  50             self._nova.endI2C(0)
  51         else:
  52             self._nova.endI2C(0, True)
  53
  54     def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
  55
  56         end = end if end else len(buffer)
  57
  58         result = self._nova.readBytesI2C(0, address, len(buffer[start:end]))
  59         resp = result.split(" ")
  60
  61         for i in range(len(buffer[start:end])):
  62             buffer[start+i] = resp[2+i]
  63
  64     def writeto_then_readfrom(self, address, buffer_out, buffer_in, *,
  65                               out_start=0, out_end=None,
  66                               in_start=0, in_end=None, stop=False):
  67
  68         out_end = out_end if out_end else len(buffer_out)
  69         in_end = in_end if in_end else len(buffer_in)
  70
  71         self._nova.startI2C(0, address)
  72
  73         for i in range(out_start, out_end):
  74             self._nova.writeByteI2C(0, buffer_out[i])
  75
  76         self._nova.endI2C(0, True)
  77
  78         result = self._nova.readBytesI2C(0, address, len(buffer_in[in_start:in_end]))
  79         resp = result.split(" ")
  80
  81         for i in range(len(buffer_in[in_start:in_end])):
  82             buffer_in[in_start+i] = resp[2+i]