I'm trying to simulate the transmit and receive of a simple message (like "Helloworld") using an MSK/GMSK modulation but I seem to have some trouble receiving the message. I used the relatively new Symbol Sync block but I seem to be unable to get my input and output signals to align. I'm guessing I haven't set the Symbol Sync parameters properly. Does anyone have any suggestions on how to do that? (See below for flowgraph and current output)
I would like to eventually be able to implement this using USRP but am trying to simulate it first. Any help would be appreciated. Thanks.
Related
We are using an ICE video streaming solution using GStreamer. But for some reason I can't find out how to detect if the receiver has suddenly vanished. GStreamer just keeps happily sending data to no recipient.
I already had thoughts about using webrtcbin's "connection-state" property but not sure if this will actually work if the client just quietly drops. Seems like it will just stay in connected state. Plus very unsure about the implementation.
Any help would be greatly appreciated.
I'm working on a BMS project for an electric car. I'm using LTC6804-2 for voltage and temperature measurement in each cells. As a first step of development, I would like to establish a successful communication with the monitoring IC (LTC6804-2). So, I'm sending set config register command and trying to read back the config register values that I have written. If I receive the configuration register values without a CRC error, I consider my communication as successful.
In my case, I do not receive expected register values with proper CRC when I read back. Let me break down my situation into small segments.
I'm working on a custom BMS board for this project(LTC6804-2 and STM32F072). I will attach the schematics below. To test my code, I tested my program with DC1942C demo board and arduino UNO. And it is working fine. I can read back the config register and I can calculate the cell voltage and Auxiliary values.
When I try to implement the same program in my custom BMS board, I'm not getting the correct values. I always get CRC error in the received data.
Following the guidelines from the Analog Devices forum, I tested the Vref2 value after sending the config register command, and the voltage goes up to ~3V as expected. So the IC is receiving the message properly. But Why it is not transmitting back?
Below are the captures from the demo board and BMS custom board.
Register read capture from Arduino Uno and demo board DC1942C
Register read capture from the custom board
In fact I tested the program with STM32 development board and DC1942 demo board, I get the correct values.
Thank you for your help. If you want any additional details, please let me know.
LTC6810-2 datasheet
I am currently working on getting a location of a vehicle to a server. I am using TK103 as my GPS device. It is sending ##,imei:<my_imei>,A; to the server when the server is started.
This is the only document of the protocol I could find on internet: https://web.archive.org/web/20140401000000*/http://www.zhyichina.com/en/gpstracking/gprs-data-protocol.xls
I followed it. But it does not work properly. It needs to send "ON" command many times to work and any of other commands did not work. Could you please help me to identify the problem.
When you get message like ##,imei:123456789012345,A; you need to respond with LOAD.
When you receive just IMEI number like 123456789012345; you need to respond with ON.
Here you can find the source code of the decoder for this protocol:
https://github.com/tananaev/traccar/blob/master/src/org/traccar/protocol/Gps103ProtocolDecoder.java
Folks
I am using ORG447x to obtain GPS fixes.
Whenever I power up my GPS module
Only response I get is
$PSRF150,1,*3E
Even if I have to write a series of input messages
"$PSRF103,01,00,01,01*24" --> Query rate for GGL message
"$PSRF100,1,4800,8,1,0*0E" --> setting serial port
I have never got any GGL output messages.
Is there any specific initialization routine I need to follow after powering up my GPS module?
Any tips or pointers appreciated
Thanks
AK
I am working on a project which uses a PIC24FJ64GA002 mcu.
I am working on a bit-banged serial communication function that will use one wire to send data and then switch to receive mode to receive data on the same pin. A separate pin will be used for clocking which will always be controlled by a different board (always an input). I am wondering is there a way to configure the pin for open-collector operation that that it can be used as an input and and output or do I have to change the pin configuration every time i go from reading to writing?
You need to change the direction of the pin each time by using the TRIS register. If the pin is set up as an output, reading the PORT register will most likely only tell you what level you are driving the pin to (assuming there is a high impedance on the pin). If the pin is set for input, you won't be able to drive your desired output value.
Also, make sure that you read incoming data using the PORT register, but output the data using the LAT register. This ensures that you don't suffer any issues if your code (I assume you are programming in C here) gets converted into bset/bclr/btgl instructions which are Read-Modify-Write. If you are writing in assembler, the same rule applies but you know when you are using these R-M-W type instructions. If you want more reasoning on this, please ask.