def read_ctrl(self):
"""
If the control char device is open and it is readable, then it reads
the control structure. Every time it internally store the control; it
will be used as default when no control is provided
"""
if self.__fdc == None or not self.is_ctrl_readable():
return None
# Read the control
bin_ctrl = os.read(self.__fdc, 512)
ctrl = ZioCtrl()
self.lastctrl = ctrl
ctrl.unpack_to_ctrl(bin_ctrl)
return ctrl
def get_current_ctrl(self):
"""
It gets the current control. It is only a wrapper of the setCtrl
method of zCtrl; user can use directly that method
"""
try:
fd_num = os.open(self.cur_ctrl, os.O_RDONLY)
bin_ctrl = os.read(fd_num, 512)
os.close(fd_num)
except:
raise
else:
ctrl = ZioCtrl()
ctrl.unpack_to_ctrl(bin_ctrl)
return ctrl
def read_data(self, ctrl = None, unpack = True):
"""
If the data char device is open and it is readable, then it reads
the data
"""
if self.__fdd == None or not self.is_data_readable():
return None
if ctrl == None:
if self.lastctrl == None:
print("WARNING: you never read control, only 16 samples read")
tmpctrl = ZioCtrl()
tmpctrl.ssize = 1
tmpctrl.nsamples = 16
else:
tmpctrl = self.lastctrl
else:
tmpctrl = ctrl
data_tmp = os.read(self.__fdd, tmpctrl.ssize * tmpctrl.nsamples)
if unpack:
return self._unpack_data(data_tmp, tmpctrl.nsamples, tmpctrl.ssize)
else:
return data_tmp
