src/adafruit_blinka/microcontroller/nova/i2c.py

   1 class I2C:
   2
   3     def __init__(self, *, frequency=400000):
   4         from adafruit_blinka.microcontroller.nova import Connection
   5         self._nova = Connection.getInstance()
   6         self._nova.setNumericalBase(10)
   7         self._nova.setOperationMode(0, "I2C")
   8         self._nova.setPullUpStateI2C(0, "EN")
   9         self._nova.setClockI2C(0, frequency)
  10
  11     def scan(self):
  12
  13         scanResults = []
  14
  15         for i in range(8, 121):
  16             result = self._nova.scanAddrI2C(0, i<<1)
  17
  18             resp = result.split(" ")
  19
  20             if resp[3] == 'OK':
  21                 scanResults.append(i)
  22
  23         return scanResults
  24
  25     def writeto(self, address, buffer, *, start=0, end=None, stop=True):
  26
  27         end = end if end else len(buffer)
  28
  29         self._nova.startI2C(0, address<<1)
  30
  31         for i in range(start, end):
  32             self._nova.writeByteI2C(0, buffer[i])
  33
  34         if stop:
  35             self._nova.endI2C(0)
  36         else:
  37             self._nova.endI2C(0, True)
  38
  39     def readfrom_into(self, address, buffer, *, start=0, end=None, stop=True):
  40
  41         end = end if end else len(buffer)
  42
  43         result = self._nova.readBytesI2C(0, address<<1, len(buffer[start:end]))
  44
  45         if result != "-NG":
  46             resp = result.split(" ")
  47
  48             for i in range(len(buffer[start:end])):
  49                 buffer[start+i] = int(resp[2+i])
  50         else:
  51             raise RuntimeError("Received error response from Binho Nova, result = " + result)
  52
  53     def writeto_then_readfrom(self, address, buffer_out, buffer_in, *,
  54                               out_start=0, out_end=None,
  55                               in_start=0, in_end=None, stop=False):
  56
  57         out_end = out_end if out_end else len(buffer_out)
  58         in_end = in_end if in_end else len(buffer_in)
  59
  60         self._nova.startI2C(0, address<<1)
  61
  62         for i in range(out_start, out_end):
  63             self._nova.writeByteI2C(0, buffer_out[i])
  64
  65         self._nova.endI2C(0, True)
  66
  67         result = self._nova.readBytesI2C(0, address<<1, len(buffer_in[in_start:in_end]))
  68
  69         if result != "-NG":
  70             resp = result.split(" ")
  71
  72             for i in range(len(buffer_in[in_start:in_end])):
  73                 buffer_in[in_start+i] = int(resp[2+i])
  74         else:
  75             raise RuntimeError("Received error response from Binho Nova, result = " + result)