/
stream.py
executable file
·148 lines (141 loc) · 6 KB
/
stream.py
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__author__ = 'Frederick NEY'
from labjack import ljm
import sys
class Stream:
def __init__(self, handles, rate):
"""
function to instance the streamer
:param rate: scanner rate
:param handles: connection to labjack devices
:return:
"""
self.rate = rate
self.handles = handles
def readStreamOn(self, io_name, request_num, scansPerRead):
"""
Function use for consulting value on the streamer
:param io_name: input output name to scan
:param request_num: number of request on the streamer -1 will be an infinite loop
:param scansPerRead: number of scan per read
:return:
"""
i = 0
request = request_num
if request_num == -1:
request = 0
totScans = 0
index = 0
array = []
totSkip = 0 # Total skipped samples
for handle in self.handles:
scanRate = ljm.eStreamStart(handle, scansPerRead, len(io_name), io_name, self.rate)
array.append([0, 0])
try:
while i <= request:
for handle in self.handles:
stream = ljm.eStreamRead(handle)
data = stream[0]
scans = len(data)/len(io_name)
totScans += scans
# Count the skipped samples which are indicated by -9999 values. Missed
# samples occur after a device's stream buffer overflows and are
# reported after auto-recover mode ends.
curSkip = data.count(-9999.0)
totSkip += curSkip
array[handle] = [array[handle][0] + data[0], array[handle][1] + data[1]]
if i % self.rate == 0 and i != 0:
ainStr = ""
for j in range(0, len(io_name)):
ainStr += "%s = %0.5f " % (io_name[j], array[handle][j] / self.rate)
print(ainStr)
array[handle] = [0, 0]
"""print("\neStreamRead %i" % i)
ainStr = ""
for j in range(0, len(io_name)):
ainStr += "%s = %0.5f " % (io_name[j], data[j])
print(ainStr)"""
if request_num != -1:
i += 1
index += 1
index = 0
except ljm.LJMError:
ljm_err = sys.exc_info()[1]
print(ljm_err)
except Exception:
e = sys.exc_info()[1]
print(e)
def syncStream(self, io_name, request_num, scansPerRead, array):
"""
Function use for consulting value on the streamer
:param io_name: input output name to scan
:param request_num: number of request on the streamer
:param scansPerRead: number of scan per read
:return:
"""
io_addr = ljm.namesToAddresses(len(io_name), io_name)[0]
i = 0
index = 0
arraymed = []
for handle in self.handles:
"""
start stream on all devices.
"""
scanRate = ljm.eStreamStart(handle, scansPerRead, len(io_addr), io_addr, self.rate)
arraymed.append([])
for j in range(len(io_name)):
arraymed[index].append(0)
index += 1
index = 0
try:
while i <= request_num:
j = 0
for handle in self.handles:
"""
append all data into an array of stream.
Example:
+---------+------+------------------------------+
| devices | scan | stream |
+---------+------+------------------------------+
| 0 | 0 | first scan out for a device |
| +------+------------------------------+
| | 1 | second scan out for a device |
| +------+------------------------------+
| | 2 | third scan out for a device |
| +------+------------------------------+
| | ... | ............................ |
+---------+------+------------------------------+
| ... | ... | ............................ |
+---------+------+------------------------------+
"""
stream = ljm.eStreamRead(handle)
data = stream[0]
array[j].append(data)
for j in range(len(io_name)):
arraymed[index][j] = arraymed[index][j] + data[j]
if i % self.rate == 0 and i != 0:
print("\neStreamRead from %i to %i" % (i - self.rate, i))
ainStr = ""
for j in range(0, len(io_name)):
ainStr += "%s = %0.5f " % (io_name[j], arraymed[index][j] / self.rateself.rat * 2)
print(ainStr)
for j in range(0, len(arraymed[index])):
arraymed[index][j] = 0
"""print("\neStreamRead %i" % i)
ainStr = ""
for j in range(0, len(io_name)):
ainStr += "%s = %0.5f " % (io_name[j], data[j])
print(ainStr)"""
j += 1
index += 1
index = 0
i += 1
except ljm.LJMError:
ljm_err = sys.exc_info()
print(ljm.ljm.errorToString(1279))
print(ljm_err)
except Exception:
e = sys.exc_info()
print(e)
"""for i in range(len(self.handles)):
for j in range(len(array[i])):
print(array[i][j])"""