Wipy 2.0 and save data on my pc, not in flash memory
-
@robert-hh
The intention of calcolo_position(sec) is which you have write. The function collect 2 values each second, calculate mean and re-use this value in the next function "acquisizione_interval_pitch", to generate the output.
I need to mantain this time of acquisition because i work on subject and I want to extract data about their trunk posture in real time. I want to give them some feedback in real time.lib_imu is a simple library create to extract by I2c BNO055.
lib_imu.get_euler return the Euler Angle of pitch, roll and yaw. -
@vflorio94 said in Wipy 2.0 and save data on my pc, not in flash memory:
lib_imu.get_euler return the Euler Angle of pitch, roll and yaw.
I am asking about the data type: Does it return a tuple with three float values?
-
@robert-hh Sorry, I didn't understand your question before.
it returns TUPLE
thank you for your help and your patience -
@vflorio94 In the first step, i changed two functions, media and calcolo_position. I simplified calcolo_position and reordered some lines. The major problem as I guess was a termination problem. It simply never hit the 0.5 second window for termination. It still is not perfect in matters of memory allocation, because it would better preallocate the "lists" as arrays. But that is a bigger change.
I changed media(), because the way it is it would implicitely allocate a list. The way it is now it's a little bit slower.def calcolo_position(secondi): # function to calculate the position each second, the number of second is assigned gc.collect() # Configure I2C to extract euler angle lib_imu.set_configmode() time.sleep(0.03) # set unit lib_imu.set_units() time.sleep(0.03) # set mode lib_imu.set_mode('ndof') # create 3 lists lista_heading = [] lista_roll = [] lista_pitch = [] t = Timer.Chrono() t.start() time.sleep(0.1) while 1: t_now = t.read() if t_now <= secondi: eul = lib_imu.get_euler() lista_heading.append(eul[0]) lista_roll.append(eul[1]) lista_pitch.append(eul[2]) time.sleep(0.5) if t_now > (secondi - 0.5): # Calculate mean and standard deviation print(lista_heading) print(lista_roll) print(lista_pitch) print("Calcolo media") mean_pos = (media(lista_pitch), media(lista_pitch), media(lista_heading)) # Calcolo deviazione standard devstd_pos = (dev_std(lista_heading), dev_std(lista_roll), dev_std(lista_pitch)) return mean_pos, devstd_pos else: t.stop() del lista_heading del lista_pitch del lista_roll gc.collect() print("Acquisizione terminata") breakdef media(sequenza): # calculate mean mean = 0.0 for _ in range (1, len(sequenza)): mean += sequenza[_] return mean / (len(sequenza)-1) -
@robert-hh thank you for your help, but also after the changes that you suggest the error stay.
i think that I need to preallocate the list as arrays, but I don't know i can do. i've never programming with python before.
Could you help me please? -
@vflorio94 I simplified calcoco_position() slightly more and added a print statement. can you tell me how far that progresses, and what is the argument you call calcoso:position(9 with?
def calcolo_position(secondi): # function to calculate the position each second, the number of second is assigned gc.collect() # Configure I2C to extract euler angle lib_imu.set_configmode() time.sleep(0.03) # set unit lib_imu.set_units() time.sleep(0.03) # set mode lib_imu.set_mode('ndof') # create 3 lists lista_heading = [] lista_roll = [] lista_pitch = [] t = Timer.Chrono() t.start() time.sleep(0.1) while 1: t_now = t.read() if t_now <= secondi: print("t-now = ", t_now) eul = lib_imu.get_euler() lista_heading.append(eul[0]) lista_roll.append(eul[1]) lista_pitch.append(eul[2]) time.sleep(0.5) else: t.stop() print(lista_heading) print(lista_roll) print(lista_pitch) print("Calcolo media") mean_pos = (media(lista_pitch), media(lista_pitch), media(lista_heading)) # Calcolo deviazione standard devstd_pos = (dev_std(lista_heading), dev_std(lista_roll), dev_std(lista_pitch)) print("Acquisizione terminata") return mean_pos, devstd_pos -
when i call calcolo_position I pass to it calcolo_position(1). But i call the function more than one time.
i change another time the code but the same is the same.
this is my 'main'
and few comment before you can find the other function that use inside the function 'calcolo_position(1)'print("START ACQUISITION") print("Rilevazione posizione corretta") time.sleep(1) position_ok = [] position_ok = calcolo_position(6) mean_pos_ok = position_ok[0] print("media posizione corretta", mean_pos_ok[2]) dev_std_ok = position_ok[1] gc.collect() print("END FIRST ACQUISITION") time.sleep(2) print("SECOND AQUISITION ") time.sleep(1) position_no =[] position_no = calcolo_position(6) mean_pos_no = position_no[0] dev_std_no = position_no[1] gc.collect() print("END SECOND AQUISITION") time.sleep(1) print("START test pitch") time.sleep(1) acquisizione_interval_pitch(20, 1, mean_pos_ok, mean_pos_no, dev_std_no )` -
@vflorio94 said in Wipy 2.0 and save data on my pc, not in flash memory:
position_ok = calcolo_position(6)
If you run that line, will it ever return or just give the error?
-
@robert-hh And if in calcolo_posuition you add a print before the while 1: loop, will that be printed?
-
@robert-hh I understand. It is the calcolo_position(1) which crashes. That could be another problem in the function media() (division by zero).
Edit: Just to be sure: can you show how the code for calcolo_position() looks now? -
@robert-hh if i add a print before 'while 1:' each time that the function is call inside the the other function 'acquisizione_interval_pitch()' I have the print that I write. So during the first time that i run the code it works. Then, if I try to run the same file for the second time it crashes.
The problem is the function 'calcolo_position(1)'.Calcolo Position before while t-now = 0.1012856 funzione get euler t-now = 0.6119527 funzione get euler [359.25, 359.0] [-0.875, -0.5] [82.5, 70.9375] Calcolo media Acquisizione terminata``` -
@vflorio94 But when the program terminates with the call to 'calcolo_position(1)', what is the error message?
-
@robert-hh
yes, the problem is the function 'calcolo_position(1)'. But after I call this function and I acquire data during 1 second, in the next call of the function the data collected before are not important.
So, I think that I need to refresh/ release this memory allocation after the call to the function but I don't know how.
Can you help me? thank you a lot. -
@robert-hh The first time the program terminates without error.
if I run for the second time the same main program don't go on and give me the message 'memory allocation...' -
@robert-hh I suppose that the problem can be the function 'calcolo_position', but i'm not sure, beacuse the message is only which I copy before.
the first time the program terminates in the right way, with no error and everything it's ok.
then I run the program newly and it don't work.
In my opinion, for my experience with c++ for example , I have to search to release the memory allocation and restart with the allocation from the begging each time that i call the function 'calcolo_position(1). but i don't know how. can you help me?
thank you for your help -
@vflorio94 said in Wipy 2.0 and save data on my pc, not in flash memory:
hen I run the program newly and it don't work.
How do you restart the program?
Normally, when objects are not used any more, they are released and garbage collection will reclaim the space. You can fore garbage collection with the call to gc.collect(). -
@robert-hh to restart the program I mantain the program open and I reuse the command run.
I put gc.collect() in the code, you can see where in the code that I copy to you before, but the error stay. -
@vflorio94 Can you try to start and run the program from a simple terminal emulator like putty or screen. Using the intgrated environments of Atom or VSC may hide or create problems.
-
@robert-hh Is IDLE Python GUI good?
now I need to implement code with more lines, to compare the other data that calcolo_position(1) return in the same function 'acquisizione_interval_pitch()'.
I'm afraid about this, because I think that the error can be show before the end of the acquisition.And more I have to use an interval of acquisition more longer than 20 second, like 120 second.
-
@vflorio94 You can use any editor you like for writing the code on you PC. The PyCom plugin for upload and run is what may create unexpected result. To sort that out, upload your code with ftp (Filezilla) and use a simple serial terminal to run the code.
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login