I've had some level of success building out my benchtop lab of nrf52840dk and nrf5340dk devices for BLE and Thread.
Moving on to Matter.
My OTBR and Matter CHIPTool are operational and I have loaded the nrf mesh light bulb and nrf mesh light switch samples.
When Matter Joining it is required to know certain pairing information from the client devices that you intend to join into the network. Makes sense.
But my sample nrf devices are showing blank data for all of the pairing data. Using the uart interface to the devices I can query matter data fields but only the VendorID and ProductID are populated. The paring pin and qrcodes are blank.
Anyone else seen this behavior?
Also, I needed to add one config item to the sample prj.cfg file to enable the uart cli matter commands.
These commands are not available by default and to enable using them, set the CONFIG_CHIP_LIB_SHELL=y Kconfig option in the prj.conf file of the given example.
Related
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 trying to communicate with my board which uses efm32lg230f256 controller.
I want to buy a cable for RS232 UART communication which properties shown in the table and link bellow.
In the table bellow from the data sheet i cant see to what voltage the controller can accept?
There could be situation where my PC will send a command with a higher values then the controller can handle and damage it.
How can i make sure it wont happen?
Thanks.
https://www.silabs.com/documents/public/data-sheets/efm32lg-datasheet.pdf
https://www.mouser.co.il/datasheet/2/163/DS_C232HD_UART_CABLE-4313.pdf
Chapter 4.2 of the data sheet shows the maximum values. Since the shown cable works at 3.3V levels, it should match perecftly if you power your controller with 3.3V.
I have LV application, where user can specify input and output channels for connected DAQ device. I want to synchronise both channels using trigger on the input channel, with analog output start as a trigger source (image on this site shows part of what I am trying to do).
My problem is that user specifies only IO channels, but how can I switch from a DAQmx Physical Channel (e.g. cDAQ1Mod4/ao0) line into source for the DAQmx Start Trigger block (probably /cDAQ1Mod4/ao0/StartTrigger in this case, but I am not sure) ?
I've found an answer, but I am not really happy with this way of solving a problem. I have to scan whole devices tree and compare channel or module names available for each device with the name of my selected channel ... simple channel property would be easier, but haven,t found any property which could give me what I need.
I have a Netduino Plus with at transeiver attached via SPI. I would like to reset the transiever every time the Netduino restarts. Is it possible to programmatically power on/off the 3V3 pin?
I would recommend using a FET (controlled by one of the I/O) pins to enable/disable 3V3 power to your transceiver. When you say transceiver, I think "more than a few mA" :)
BTW, we took this feedback into account with the new Shield Base module for Netduino Go. It has an integrated FET on both 3V3 and 5V power headers, so you could enable/disable power to your shield in code. Once the new Ethernet go!bus module ships and the Shield Base comes out of beta (soon), your solution can be redeployed to Netduino Go + Shield Base with few/no code changes.
Chris
Secret Labs LLC
Looking at the circuit diagram ( http://www.netduino.com/netduinoplus/schematic.pdf ), I can see only the Micro SD Card Slot having its power controlled programmatically. You could rig up a relay to control it (via a transistor, of course) instead, or if the transceiver uses less than 130mA (the current limit of the device shown: http://www.datasheetarchive.com/BSS84W-7-F-datasheet.html) you could copy the circuit from the Netduino Plus. Buying a relay shield looks like overkill, but you might have other uses for it.
Have you looked into resetting the transceiver programmatically instead of the brute-force method of power-cycling it?
Just to provide another view. You could use a transistor powered off the netduino RESET line, this will reset the device every time the netduino reboots. Or you can just link the transistor to a spare digital pin and power it in code..
What specific SPI device are you using? You mention that it's a transceiver but we could probably provide better information if we know the exact part number. If your device requires less than 8mA the Netduino Plus specs seem to indicate that one option could be using a digital output pin as the power source.
Unfortunately Secret Labs don't use exactly the language I'd expect and call out the sink and source current maximums so I would contact them directly first to see if you risk blowing your chip. I'll see if I can get an answer from them and amend this post if/when I do.
Update: Sink and source current is the same on the Netduino. See my post on their forums about sink vs. source current for a more in depth explanation. So, if your device can run off of just a few milliamps you should be able to use a digital I/O pin to power it.
Also, a lot of devices have enable pins. You can usually reset them with that line instead of pulling the power if that helps. Sometimes with flaky hardware it is better to pull the power though.
Over the past two days, I am doing some reading on how to get data over USB from an external device which has no device driver installed. I have to read data from a WT500 Yokogawa Power Meter (basically I want to read just one of the parameter that the meter shows, just the power values) over USB. I am aware that a device driver for WT500 is available, but it has some dependencies and I do not want to install a software or change anything majorly in our node to cater to that.
I have found that libusb could be used to perform what I would want, and I have a C program that sniffs the USB device and returns some information. I have looked into usb-robot as well, which also uses libusb. The server node that I am probing has OpenSUSE Linux kernel 2.6.30. I have usbfs mounted.
Question:
I am expecting that using libusb, I would be able to get data dumps from the power meter whenever I request, via usb device. Can I request the meter something like - send 25k of data, and then upon parsing it, I get the parameter value that I am looking for? Considering that I have zero knowledge about the device, can I get some meaningful values out of it? An example code would help.
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There are some standard messages like ?IDN with which a USBTMC device could be queried. However, specific queries need to be sent to a meter (the syntax should be there in the technical doc/manual/communication interface) if one needs to get whatever is showing up on screen.
I guess there are no easier ways of doing what I want - like just reading a file using something like fread ??
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Yes, almost. If USBTMC module is installed (the default one in our kernel did not work, detailed explanation of installing and querying a device is here - http://code.google.com/p/scte/wiki/USBTMC), then one just needs to send some queries and read the response via cat or something from the specific files under /dev.
From the meter technical document, I see that the driver communication interface that is described is Windows specific, so I reckon I might need to do some reverse engineering.
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Yes, but only a tiny bit or may be not at all.
Thank you.
EDIT: After a bit of googling I think I have the answers, I have added them next to the questions I asked.