pyserial

How to expand input buffer size of pyserial

由 a 夏天 提交于 2019-12-04 11:13:03
问题 I want to communicate with the phone via serial port. After writing some command to phone, I used ser.read(ser.inWaiting()) to get its return value, but I always got total 1020 bytes of characters, and actually, the desired returns is supposed to be over 50KB . I have tried to set ser.read(50000) , but the interpreter will hang on. How would I expand the input buffer to get all of the returns at once? 回答1: I have had exactly the same problem, including the 1020 byte buffer size and haven't

Identifying serial/usb device python

由 我怕爱的太早我们不能终老 提交于 2019-12-04 08:37:23
The solution to this problem is probably pretty simple, but I am new to interfacing with a device dynamically. What I'm doing is I am making a python executable code, so the user doesn't have to have Idle on their computer or any kind of python interpreter, which means I don't know which USB port the device will be plugged in to. The program needs to be able to open a connection to a device that is connected through a serial to usb converter. How can I determine which connected device is the correct device to open a port to? I am using pySerial to interact with the device. Any help would be

How to read serial data with multiprocessing in python?

由 二次信任 提交于 2019-12-04 06:48:49
问题 I have a device that outputs data at irregular intervals. I want to write data onto a csv in 2 second intervals. So I figured multiprocessing with a queue might work. Here I'm trying to just pass data from one process to another but I get Serial Exception. Also, I'm unable to run it on IDLE. So I'm stuck with using the terminal. As a result, the error message closes as soon as it opens. Here's the code: import multiprocessing import time import datetime import serial try: fio2_ser = serial

pySerial sends ASCII data but recieving device does not respond to it

由 三世轮回 提交于 2019-12-04 06:37:00
问题 I have been trying to get pySerial to send commands to a device (Weight scale, and mass flow controller) both use ASCII format, and both do not respond to comands sent. However I can easely control both with use of Terminal. I have create a virtual comport to see whats being sent to my devices from pySerial but it sends correct data. (T\r\n is sent as T 13 10, same as what Terminal sends ) so I am at a loss. It seems as though pySerial sends out the right data to my device but for what ever

usb automatic detection in python for linux env

由 只愿长相守 提交于 2019-12-04 05:52:09
问题 I'm using polling command(glob('/dev/tty[A-Za-z]*')) in python to detect usb devices connected to my linux pc in regular interval for my application. Is there any way to detect usb devices connected automatically? 回答1: Here is a start. You can find your usb vendor here. You got to code yourself a current_list_usb , set a time interval to check so you can compare and see if a new device is attached or not. Some code to use when importing usb module: import usb, usb.core, usb.util, usb.backend

python and serial. how to send a message and receive an answer

由 情到浓时终转凉″ 提交于 2019-12-04 04:48:09
问题 I have to send ZANE:1:00004:XX_X.X_XXXX_000XX:\r\n via serial communication with python. here is my code: import serial ser = serial.Serial('/dev/cu.usbserial-A901HOQC') ser.baudrate = 57600 msg = 'ZANE:1:00004:XX_X.X_XXXX_000XX:\r\n' If I write: >>> ser.write(msg) the answer will be 33 , which is the length in byte of the message I'm sending. How can I receive the answer? The connected device will answer just after he gets the message, but if I type >>> ser.write(msg); ser.readline() the

Kill process that raises Device or resource busy: '/dev/ttyUSB0'?

由 社会主义新天地 提交于 2019-12-03 23:23:25
I connect to my Arduino board with the following Python code. device=glob.glob("/dev/ttyUSB*")[0] time.sleep(1) arduino = serial.Serial(device, 115200, timeout=5) It generally works, but somehow some other process must be accessing the board after reboot giving me the error serial.serialutil.SerialException: could not open port /dev/ttyUSB0: [Errno 16] Device or resource busy: '/dev/ttyUSB0' When unplugging and replugging the USB-plug I can execute the Python code normally, without the error occuring. How can I avoid any other process blocking the port? And how do I find out the reason for

Microprocessor to RS-232 realtime plot using PySerial/Matplotlib?

由 守給你的承諾、 提交于 2019-12-03 20:32:29
I'm new to the world of Python and my programming skills are fairly poor but I'm trying to figure a way to use Python to display the output from an EEG circuit (using the OpenEEG circuit http://openeeg.sourceforge.net ) The analogue output is amplified and processed via an ADC (in an ATmega8 microcontroller) and is converted to RS232 by a MAX232. The RS232 Signal is as follows: Byte 1: sync value 0xa5 Byte 2: sync value 0x5a Byte 3: version Byte 4: Frame number Byte 5: Channel 1 Low Byte Byte 6: Channel 1 High Byte Byte 7: Channel 2 Low Byte Byte 8: Channel 2 High Byte ... Bytes 9-16 are for

Python Numpy Installation Windows 10 64-bit

由 别等时光非礼了梦想. 提交于 2019-12-03 16:53:03
I know that there have been multiple posts on numpy and pyserial installation in python on stack overflow, but somehow none of them seem to work for me. Possibly, i am not able to clearly understand what i have done and am stuck I will list down the things i did that i think are relevant to solving the question. A request- Please help me reach a solution before marking my question as a repeat. Things you need to know- 64bit, Windows10, Python3.4, Python2.6.1, Python 2.7 Things i tried- 1) used the Official git repository for NUMPY -> tried to install it using the command prompt as:- C:\Desktop

Using a QThread in PyQT for serial communication (w. pyserial)

由 微笑、不失礼 提交于 2019-12-03 16:03:36
I am pretty much a beginner when it comes to GUI programming. I am using QT in combination with python bindings (PyQT4). What I am trying to do: Setting up a QThread to read from & write to a Serial Port with pyserial. The main application should be able to emit new serial data via a signal to the running QThread . and receive serial data from the QThread with a signal. I started my own test implementation based on this code ( Link ). Prior to this I read the basics about QThread s and tried to understand how they are intended to be used. The following test code is what I have come up with. I
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