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Lda: replace assert with direct exception raising

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This commit is contained in:
Yann Sionneau 2015-02-20 17:15:55 +01:00 committed by Sebastien Bourdeauducq
parent 0dd5692c32
commit 5cfdac9c7c
1 changed files with 11 additions and 5 deletions
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16
artiq/devices/lda/driver.py
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@ -156,7 +156,8 @@ class Lda:
buf = struct.pack("BBB6s", 0, command, length, data)
res = self._check_error(self.hidapi.hid_write(self._dev, buf,
len(buf)))
assert res == len(buf), res
if res != len(buf):
raise IOError
def set(self, command, data):
"""Sends a SET command to the Lab Brick device.
@ -165,8 +166,10 @@ class Lda:
:param data: payload of the command.
"""
assert command & 0x80
assert data
if not data:
raise ValueError("Data is empty")
if not (command & 0x80):
raise ValueError("Set commands must have most significant bit set")
self.write(command, len(data), data)
def get(self, command, length, timeout=1000):
@ -179,14 +182,17 @@ class Lda:
:rtype: bytes
"""
assert not command & 0x80
if command & 0x80:
raise ValueError("Get commands must not have most significant bit"
" set")
status = None
self.write(command, length)
buf = ctypes.create_string_buffer(8)
while status != command:
res = self._check_error(self.hidapi.hid_read_timeout(self._dev,
buf, len(buf), timeout))
assert res == len(buf), res
if res != len(buf):
raise IOError
status, length, data = struct.unpack("BB6s", buf.raw)
data = data[:length]
logger.info("%s %s %r", command, length, data)