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lda: style

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This commit is contained in:
Sebastien Bourdeauducq 2015-02-18 11:31:44 -07:00
parent dc132bd248
commit 05824fd3be
1 changed files with 10 additions and 13 deletions
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23
artiq/devices/lda/driver.py
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@ -41,13 +41,12 @@ class Ldasim:
"""Stores the new attenuation value and prints it to console.
:param attenuation: The attenuation value in dB.
:type attenuation: int, float or Fraction
"""
step = self.get_att_step_size()
if isinstance(attenuation, Quantity):
check_unit(attenuation, 'dB')
check_unit(attenuation, "dB")
att = attenuation
else:
att = attenuation*dB
@ -55,13 +54,13 @@ class Ldasim:
att = round(att/step)*step
if att > self.get_att_max():
raise ValueError('Cannot set attenuation {} > {}'
raise ValueError("Cannot set attenuation {} > {}"
.format(att, self.get_att_max()))
elif att < 0*dB:
raise ValueError('Cannot set attenuation {} < 0'.format(att))
raise ValueError("Cannot set attenuation {} < 0".format(att))
else:
att = round(att.amount*4)/4. * dB
print("[LDA-sim] setting attenuation to {}".format(att))
print("setting attenuation to {}".format(att))
self._attenuation = att
@ -118,7 +117,6 @@ class Lda:
def close(self):
"""Close the device.
"""
self.hidapi.hid_close(self._dev)
def get_att_step_size(self):
@ -174,9 +172,9 @@ class Lda:
def get(self, command, length, timeout=1000):
"""Sends a GET command to read back some value of the Lab Brick device.
:param int command: Command ID, most significant bit must be cleared.
:param int length: Length of the command, "count" in the datasheet.
:param int timeout: Timeout of the HID read in ms.
:param command: Command ID, most significant bit must be cleared.
:param length: Length of the command, "count" in the datasheet.
:param timeout: Timeout of the HID read in ms.
:return: Returns the value read from the device.
:rtype: bytes
"""
@ -207,13 +205,12 @@ class Lda:
"""Sets attenuation value of the Lab Brick device.
:param attenuation: Attenuation value in dB.
:type attenuation: int, float or Fraction
"""
step = self.get_att_step_size()
if isinstance(attenuation, Quantity):
check_unit(attenuation, 'dB')
check_unit(attenuation, "dB")
att = attenuation
else:
att = attenuation*dB
@ -221,9 +218,9 @@ class Lda:
att = round(att/step)*step
if att > self.get_att_max():
raise ValueError('Cannot set attenuation {} > {}'
raise ValueError("Cannot set attenuation {} > {}"
.format(att, self.get_att_max()))
elif att < 0*dB:
raise ValueError('Cannot set attenuation {} < 0'.format(att))
raise ValueError("Cannot set attenuation {} < 0".format(att))
else:
self.set(0x8d, bytes([int(round(att.amount*4))]))