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     def scan(self):
  25
  26         scanResults = []
  27
  28         for i in range(8, 121):
  29             result = self._nova.scanAddrI2C(0, i<<1)
  30
  31             resp = result.split(" ")
  32
  33             if resp[3] == 'OK':
  34                 scanResults.append(i)
  35
  36         return scanResults
  37
  38     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
  39
  40         end = end if end else len(buffer)
  41
  42         self._nova.startI2C(0, address)
  43
  44         for i in range(start, end):
  45             self._nova.writeByteI2C(0, buffer[i])
  46
  47         if stop:
  48             self._nova.endI2C(0)
  49         else:
  50             self._nova.endI2C(0, True)
  51
  52     def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
  53
  54         end = end if end else len(buffer)
  55
  56         result = self._nova.readBytesI2C(0, address, len(buffer[start:end]))
  57         resp = result.split(" ")
  58
  59         for i in range(len(buffer[start:end])):
  60             buffer[start+i] = resp[2+i]
  61
  62     def writeto_then_readfrom(self, address, buffer_out, buffer_in, *,
  63                               out_start=0, out_end=None,
  64                               in_start=0, in_end=None, stop=False):
  65
  66         out_end = out_end if out_end else len(buffer_out)
  67         in_end = in_end if in_end else len(buffer_in)
  68
  69         self._nova.startI2C(0, address)
  70
  71         for i in range(out_start, out_end):
  72             self._nova.writeByteI2C(0, buffer_out[i])
  73
  74         self._nova.endI2C(0, True)
  75
  76         result = self._nova.readBytesI2C(0, address, len(buffer_in[in_start:in_end]))
  77         resp = result.split(" ")
  78
  79         for i in range(len(buffer_in[in_start:in_end])):
  80             buffer_in[in_start+i] = resp[2+i]