Merge pull request #24 from kattni/add-debug-to-i2cdevice

Added debug to i2c_device.

Author: ladyada

adafruit_bus_device/i2c_device.py

@@ -57,7 +57,7 @@ class I2CDevice:
  device.write(bytes_read)
  """
 
- def __init__(self, i2c, device_address):
+ def __init__(self, i2c, device_address, *, debug=False):
  """
  Try to read a byte from an address,
  if you get an OSError it means the device is not there
@@ -79,6 +79,7 @@ def __init__(self, i2c, device_address):
 
  self.i2c = i2c
  self.device_address = device_address
+ self._debug = debug
 
  def readinto(self, buf, **kwargs):
  """
@@ -94,6 +95,8 @@ def readinto(self, buf, **kwargs):
  :param int end: Index to write up to but not include
  """
  self.i2c.readfrom_into(self.device_address, buf, **kwargs)
+ if self._debug:
+ print("i2c_device.readinto:", [hex(i) for i in buf])
 
  def write(self, buf, **kwargs):
  """
@@ -110,6 +113,8 @@ def write(self, buf, **kwargs):
  :param bool stop: If true, output an I2C stop condition after the buffer is written
  """
  self.i2c.writeto(self.device_address, buf, **kwargs)
+ if self._debug:
+ print("i2c_device.write:", [hex(i) for i in buf])
 
 #pylint: disable-msg=too-many-arguments
  def write_then_readinto(self, out_buffer, in_buffer, *,
@@ -143,14 +148,26 @@ def write_then_readinto(self, out_buffer, in_buffer, *,
  if in_end is None:
  in_end = len(in_buffer)
  if hasattr(self.i2c, 'writeto_then_readfrom'):
+ if self._debug:
+ print("i2c_device.writeto_then_readfrom.out_buffer:",
+ [hex(i) for i in out_buffer[out_start:out_end]])
  # In linux, at least, this is a special kernel function call
  self.i2c.writeto_then_readfrom(self.device_address, out_buffer, in_buffer,
  out_start=out_start, out_end=out_end,
  in_start=in_start, in_end=in_end, stop=stop)
+ if self._debug:
+ print("i2c_device.writeto_then_readfrom.in_buffer:",
+ [hex(i) for i in in_buffer[in_start:in_end]])
  else:
  # If we don't have a special implementation, we can fake it with two calls
  self.write(out_buffer, start=out_start, end=out_end, stop=stop)
+ if self._debug:
+ print("i2c_device.write_then_readinto.write.out_buffer:",
+ [hex(i) for i in out_buffer[out_start:out_end]])
  self.readinto(in_buffer, start=in_start, end=in_end)
+ if self._debug:
+ print("i2c_device.write_then_readinto.readinto.in_buffer:",
+ [hex(i) for i in in_buffer[in_start:in_end]])
 
 #pylint: enable-msg=too-many-arguments