def update_stream_out_buffer(handle, out_context):
# Write values to the stream-out buffer. Note that once a set of values have
# been written to the stream out buffer (STREAM_OUT0_BUFFER_F32, for
# example) and STREAM_OUT#_SET_LOOP has been set, that set of values will
# continue to be output in order and will not be interrupted until their
# "loop" is complete. Only once that set of values have been output in their
# entirety will the next set of values that have been set using
# STREAM_OUT#_SET_LOOP start being used.
out_names = out_context["names"]
ljm.eWriteName(handle, out_names["loop_size"], out_context["state_size"])
state_index = out_context["current_index"]
error_address = -1
current_state = out_context["states"][state_index]
values = current_state["values"]
info = ljm.getHandleInfo(handle)
max_bytes = info[5]
SINGLE_ARRAY_SEND_MAX_BYTES = 520
if max_bytes > SINGLE_ARRAY_SEND_MAX_BYTES:
max_bytes = SINGLE_ARRAY_SEND_MAX_BYTES
NUM_HEADER_BYTES = 12
NUM_BYTES_PER_F32 = 4
max_samples = int((max_bytes - NUM_HEADER_BYTES) / NUM_BYTES_PER_F32)
start = 0
while start < len(values):
num_samples = len(values) - start
if num_samples > max_samples:
num_samples = max_samples
end = start + num_samples
write_values = values[start:end]
ljm.eWriteNameArray(handle, out_names["buffer"], num_samples,
write_values)
start = start + num_samples
ljm.eWriteName(handle, out_names["set_loop"], out_context["set_loop"])
print(" Wrote " + \
out_context["names"]["stream_out"] + \
" state: " + \
current_state["state_name"]
)
# Increment the state and wrap it back to zero
out_context["current_index"] = (state_index + 1) % len(
out_context["states"])
def update_stream_out_buffer(handle, out_context):
# Write values to the stream-out buffer. Note that once a set of values have
# been written to the stream out buffer (STREAM_OUT0_BUFFER_F32, for
# example) and STREAM_OUT#_SET_LOOP has been set, that set of values will
# continue to be output in order and will not be interrupted until their
# "loop" is complete. Only once that set of values have been output in their
# entirety will the next set of values that have been set using
# STREAM_OUT#_SET_LOOP start being used.
out_names = out_context["names"]
ljm.eWriteName(handle, out_names["loop_size"], out_context["state_size"])
state_index = out_context["current_index"]
error_address = -1
current_state = out_context["states"][state_index]
values = current_state["values"]
info = ljm.getHandleInfo(handle)
max_bytes = info[5]
SINGLE_ARRAY_SEND_MAX_BYTES = 520
if max_bytes > SINGLE_ARRAY_SEND_MAX_BYTES:
max_bytes = SINGLE_ARRAY_SEND_MAX_BYTES
NUM_HEADER_BYTES = 12
NUM_BYTES_PER_F32 = 4
max_samples = int((max_bytes - NUM_HEADER_BYTES) / NUM_BYTES_PER_F32)
start = 0
while start < len(values):
num_samples = len(values) - start
if num_samples > max_samples:
num_samples = max_samples
end = start + num_samples
write_values = values[start:end]
ljm.eWriteNameArray(handle, out_names["buffer"], num_samples, write_values)
start = start + num_samples
ljm.eWriteName(handle, out_names["set_loop"], out_context["set_loop"])
print(" Wrote " + \
out_context["names"]["stream_out"] + \
" state: " + \
current_state["state_name"]
)
# Increment the state and wrap it back to zero
out_context["current_index"] = (state_index + 1) % len(out_context["states"])
def initialise_streamout(handle,waveform,size=1): '''Intialise a labjack handle object open for Stream-Out with a buffer sufficient for a loop size of 127 values on DAC0 from a waveform iterable given. If the loop is bigger than 127, specify the multiplier with the size variable''' #Writing constants for Stream-Out ljm.eWriteName(handle,"STREAM_OUT0_ENABLE",0) ljm.eWriteName(handle,"STREAM_OUT0_TARGET",1000) ljm.eWriteName(handle,"STREAM_OUT0_BUFFER_SIZE",256*size) ljm.eWriteName(handle,"STREAM_OUT0_ENABLE",1) #Writing the waveform onto the labjack ljm.eWriteName(handle,"STREAM_OUT0_LOOP_SIZE",size*127) for x in range(size): ljm.eWriteNameArray(handle,"STREAM_OUT0_BUFFER_F32",127,waveform[x*128:(x+1)*127]) ljm.eWriteName(handle,"STREAM_OUT0_SET_LOOP",1)
handle = ljm.openS("T7", "ETHERNET", "470010370")
#Writing constants for Stream-Out
ljm.eWriteName(handle, "STREAM_OUT0_ENABLE", 0)
ljm.eWriteName(handle, "STREAM_OUT0_TARGET", 1000)
ljm.eWriteName(handle, "STREAM_OUT0_BUFFER_SIZE", 2048)
ljm.eWriteName(handle, "STREAM_OUT0_ENABLE", 1)
size = 1
val = np.arange(2.5, 5, 2.5 / (size * 128))
#Writing the waveform onto the labjack
ljm.eWriteName(handle, "STREAM_OUT0_LOOP_SIZE", size * 127)
for x in range(4):
ljm.eWriteNameArray(handle, "STREAM_OUT0_BUFFER_F32", 127,
val[x * 128:(x + 1) * 127])
ljm.eWriteName(handle, "STREAM_OUT0_SET_LOOP", 1)
ljm.eStreamStart(handle, size * 127, 2, [4800, 0], 150)
for x in range(2):
read = ljm.eStreamRead(handle)
data = np.append(data, read[0][0:size * 127])
print x
ljm.eStreamStop(handle)
print("Stream finished")
theospace = np.linspace(size * 127, 2 * size * 127, size * 127)
slope = ((2.5 * theospace) / (size * 127))
space = np.linspace(2.5, 5, size * 127)
#Paramters for acquisition
scanres = int(args.scantime * int(127))
data = []
#Opening labjack and generating handle object
handle = ljm.openS("T7","ETHERNET","470010370")
#Writing constants for Stream-Out
ljm.eWriteName(handle, "STREAM_OUT0_ENABLE",0)
ljm.eWriteName(handle,"STREAM_OUT0_TARGET",1000)
ljm.eWriteName(handle,"STREAM_OUT0_BUFFER_SIZE",256)
ljm.eWriteName(handle,"STREAM_OUT0_ENABLE",1)
#Writing the waveform onto the labjack
ljm.eWriteName(handle,"STREAM_OUT0_LOOP_SIZE",127)
ljm.eWriteNameArray(handle,"STREAM_OUT0_BUFFER_F32",127,val[0:127])
ljm.eWriteName(handle,"STREAM_OUT0_SET_LOOP",1)
#Start streaming. 4800 is Stream-Out. 0 is Stream-In
ljm.eStreamStart(handle,scanres,2,[4800,2],fqreal*127)
for i in range(args.acqtime):
read = ljm.eStreamRead(handle)
data.append(read[0][0:scanres])
if args.verbosity >0:
print(ljm.eStreamRead(handle)[1:])
ljm.eStreamStop(handle)
ljm.close(handle)
def ctrl_antenna_motor(self, state):
if state in DRIVE_BITS:
bits = DRIVE_BITS[state]
ljm.eWriteNameArray(self.lj_handle, port.DRIVE, len(bits), bits)
