How to parse and read JSON file correctly?

RE: How to parse and read JSON file correctly?

Carl Richard — Wed, 28 Oct 2020 14:12:38 GMT

Hi!

Good to hear. West is the tool that is used to handling things like dependencies, so when using west init for the sdk-nrf, Zephyr should be installed along with it. What was the output of "west update"?

For your second query I suggest that you open a new ticket.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Wed, 28 Oct 2020 12:12:45 GMT

Hi again,

I added the new lines in my configuration file and now it works properly. Thanks a lot! I know I installed sdk-nrf, but I think that the Zephyr SDK is mentioned in the error...or I am missing something? Also, do you maybe have some examples where I can find how to use non-volatile memory?

Thanks in advance,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Wed, 28 Oct 2020 10:32:30 GMT

Hi again.

If you add the config lines from my previous comment to your prj.conf I believe it should work.

When it comes build problems. Can you try to run the command "West update" and provide me the output? And to repeat myself, the SDK is necessary, but it's installed in the NCS folder when running west init -m github.com/.../sdk-nrf --mr <ncs_revision_here>.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Wed, 28 Oct 2020 09:56:53 GMT

Hi Carl,

Thanks for this advice related to my proj.conf file! I will send you my proj.conf file to check. I have followed all the NCS installation steps, as we talked about before. Also, I installed Zephyr inside the same folder as nrf, but I think the main problem is in Zephyr-SDK...I did not install it because you told me before that's not necessary to have. But, I send you my error, and then maybe you will be able to see more clearly what the issue is.

proj.conf file:

CONFIG_BT=y
CONFIG_BT_DEBUG_LOG=y
CONFIG_BT_SMP=y
CONFIG_BT_PERIPHERAL=y
CONFIG_BT_GATT_DIS=y
CONFIG_BT_GATT_DIS_PNP=n
CONFIG_BT_GATT_BAS=y
CONFIG_BT_DEVICE_NAME="Zephyr Health Thermometer"
CONFIG_BT_DEVICE_APPEARANCE=768
CONFIG_BT_ATT_ENFORCE_FLOW=n
CONFIG_ADC=y
CONFIG_LOG=y
CONFIG_LOG_PRINTK=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y
CONFIG_NEWLIB_LIBC=y

RE: How to parse and read JSON file correctly?

Carl Richard — Wed, 28 Oct 2020 09:01:02 GMT

Hi again, Adnan!

Could you share your prj.conf? In other to achieve proper RTT the following should be present:

#Activate serial
CONFIG_SERIAL=y

#Deactivate UART
CONFIG_UART_CONSOLE=n

#Use RTT for logging
CONFIG_RTT_CONSOLE=y
CONFIG_USE_SEGGER_RTT=y

----

What kind of error are you getting? One of the steps in the installation guides I have shared earlier is installing west, so If you've followed those I don't believe that's the problem.

As I've said earlier, when following the NCS installation guidelines, Zephyr will be installed.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Tue, 27 Oct 2020 12:14:15 GMT

Hi Carl,

I have already done that, but I am still not able to see outputs in my JLinkRTTViewer. Is there some another way, because I found on the web that I need to install something specific for RTT Viewer? Also, at the end I installed again everything on my Ubuntu. Now my question is related to west function, because I will probably use Ubuntu terminal, not Segger. When I tried to run the command: west build -b nrf52dk_nrf52832 -p, I got an error related to my SDK. Before, you told me that I don't need to install Zephyr SDK. Do I need to install it at the end in order to run the west function or I made mistakes somewhere else?

Thanks in advance!

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Mon, 26 Oct 2020 14:16:02 GMT

Hi, Adnan!

You are correct, my apologies. To be able to use "printf" and print float values you must add #include <stdio.h> your main, as well as the following configs in prj.conf:

CONFIG_NEWLIB_LIBC=y
CONFIG_NEWLIB_LIBC_FLOAT_PRINTF=y

Hope this works for you!

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Mon, 26 Oct 2020 13:48:45 GMT

Hi Carl,

Yes, I know how to use it, but in my example I need to print out the float values, which is not possible with the printk function I think? Correct me if I am wrong.

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Mon, 26 Oct 2020 13:43:55 GMT

Hi Adnan!

To print out to terminal in Zephyr I recommend using the "printk" function, which essentially does the same as "printf". There is a usage example in my previous attachment.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Mon, 26 Oct 2020 13:11:47 GMT

Hi Carl,

My main problem is related to the printf function because when I want to print out the temperature value, I am not able to do that. I checked all libraries that I used before, and also added some things in CMakeLists.txt as you sent me before, but still without results. Do you maybe know how can I fix this issue related to printf function inside my Segger sample?

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Thu, 22 Oct 2020 10:33:42 GMT

Hi again, Adnan!

Sorry to hear that the Linux installation did not work out. Glad to hear that you're trying on windows!

To include header files in Zephyr (and the nRF Connect SDK) you have to use edit CMakeLists.txt so that CMake is aware of your other files. Have a look at the sample I've attached, where a module "mult.h" has been included in the hello_world sample.

3704.header_sample.zip

When editing CMakeLists.txt, make sure to reload the project in SES afterwards.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Wed, 21 Oct 2020 07:12:48 GMT

Hi Carl again,

Thanks a lot for this information. I tried it, but again without success. I installed everything on my Windows, but now I have a problem with header files, how to include them in Segger? I can run the samples and open JLinkRTTViewer to see outputs, but for example "battery.h" or "hts.h" header files are not included. Do you maybe know how can I fix this problem?

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Fri, 16 Oct 2020 13:32:00 GMT

Hi again!

Can you try to call:

env | grep ZEPHYR_BASE

and write the output here?

Could you also try the following steps:
1. Uninstall west from your system (pip uninstall west)
2. Find any folder named .west and delete it
3. Reinstall west (pip install west)
4. Follow the NCS installation guide once more

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Fri, 16 Oct 2020 10:12:49 GMT

Hi Carl,

I tried to unset this variable, but there is still the same error when I try to run this command:

west init -m github.com/.../sdk-nrf --mr v1.3.2

Error:

FATAL ERROR: already initialized in /home/adnan, aborting.

Now I only see the chance to reboot the whole Ubuntu and start from scratch everything. Do you see
any possible solution of this error? 

Best regards, 

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Fri, 16 Oct 2020 09:29:47 GMT

Hi again!

In Ubuntu it should be enough to call "unset ZEPHYR_BASE" on the command line and restarting your shell. And yes, gnuarmemb is just an empty directory and it does not need to be in the NCS directory. We recommend the location "~/gnuarmemb".

I understand you. It's a bit convoluted.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Thu, 15 Oct 2020 13:04:02 GMT

Hi Carl,

Thanks again for this help! I am using Ubuntu 18.04.5 LTS. Gnuarmemb is just the classic empty folder or what? That is what I am interested in...Is this folder at the end have to be in ncs directory or not? Related to this part with host dependencies I understood. I will try to follow all steps, but sometimes I just think that maybe you put some steps before the ones that should be on that place...if you understand me?

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Thu, 15 Oct 2020 12:10:51 GMT

Hi again! I see! Seems like you are correct that you have to unset the ZEPHYR_BASE environment variable. How you do this depends on your operating system. What is your OS? Secondly, if you don't have the gnuarmemb directory you should create it, and then install the toolchain there. If you follow the NCS installation guide you will end up with a directory where all relevant repositories (including Zephyr) are present. The only thing you should need to do from the Zephyr Getting Started guide is to install the host dependencies, the rest is handled in the nRF Connect SDK installation guide.

Most Python dependencies should be present from your previous Zephyr installation, but I recommend installing them as described anyways just to be sure.

I understand that this is troublesome.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Thu, 15 Oct 2020 10:25:24 GMT

Hi Carl,

I deleted the whole Zephyr directroy and zephyr-sdk as well. I start from scratch again, but I am still not able to solve the problem related to nrf-sdk. This is the error that I get every time when I try to run this command west init -m github.com/.../sdk-nrf --mr v1.3.2:

FATAL ERROR: already initialized in /home/adnan, aborting.

I really don't know how to solve this problem and also I don't know what could be a problem if I removed everything and start from scratch. Also, the second problem is related to the installation of toolchain and required tools. When I install GNU Arm Embedded Toolchain how can I put it inside the folder ~/gnuarmemb if I don't have it at that time. Also, you referred to the Zephyr Getting Started Guidline. I need to follow these steps until Get Zephyr and install Python dependencies this part or even I need to install Zephyr inside the same directory as I did it before ~zephyrproject?

Can you please help me to solve these issues because I am really quite confusing related to all these part and errors.

Thanks a lot in advance and best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Wed, 14 Oct 2020 12:39:20 GMT

Hi again.

We do not recommend adding the nRF Connect SDK to the standalone Zephyr repository as you have described here. It is not guaranteed that things will work, and do not know how do make it work.

If you follow the installation procedure described in our documentation, either using the Toolchain Manager or manually I can and will support you if there are any issues. I do not think it should be necessary to uninstall the old Zephyr repository, but if you want to it should only be a matter of deleting the whole directory. The relevant environment variables can be changed manually, if needed.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Wed, 14 Oct 2020 10:50:32 GMT

Hi Carl,

I did not uninstall my Zephyr standalone, but I am trying to add sdk-nrf v1.3.2 release to my existing zephyrproject repository. Is that possible or I make the mistake doing this procedure in that way? Also, trying this I got some error like: FATAL ERROR: already initialized in /home/adnan/zephyrproject, aborting. I found that I can resolve this issue unsetting the ZEPHYR_BASE environmental variable. Also, do you maybe know which is the procedure of uninstalling to all existing zephyrproject repository in case that I cannot finish my job like I explained above? And, my last question where can I unset this variable in my documentation?

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Tue, 13 Oct 2020 12:42:21 GMT

I see. Thanks for providing the links.

First: don't know how much you have edited the samples, but from what I can see the peripheral_ht "simulates" the battery level by setting it to 100. Furthermore the Battery Service(BAS) operates with percentages. To calculate these you must know the maximum capacity of your battery, and measure the voltage as you describe.

Secondly: Yes, I do suggest this. You will get access to the same samples, but in an development environment maintained and supported by us.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Tue, 13 Oct 2020 12:02:17 GMT

Hi Carl,

Yes of course I will provide you the samples that I use. To be clear enough, I use this sample where I can get the values for temperature and battery level (in percentage) and send them to my central node on which for now I am only able to read temperature value. Then, I put this part related to voltage reading just because I wanted to convert these percentages into mV (integer). Now, I got some values in percentage that I don't know how to make the relation between them and mV. Still, my central node is not able to read the battery level that I want to sent him from my peripheral one, and I don't know how to implement that service. Do you suggest me to uninstall my Zephyr standalone and install the nRF Connect SDK with all samples that were already included in Zephyr standalone documentation?

These are links of examples that I use for now:

https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/boards/nrf/battery - for voltage reading

https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/bluetooth/peripheral_ht - for temperature and battery level reading / peripheral node

https://github.com/nrfconnect/sdk-zephyr/tree/master/samples/bluetooth/central_ht - central node

RE: How to parse and read JSON file correctly?

Carl Richard — Tue, 13 Oct 2020 11:52:16 GMT

Hi, Adnan!

Could you provide a link to the samples you are referring to? I'll have a look. If I understand you correctly, then yes, the samples can be combined and used in one directory.

To be clear: The full Zephyr RTOS is available as a part of NCS.

Best regards,
Carl Richard

RE: How to parse and read JSON file correctly?

Aduka_27 — Tue, 13 Oct 2020 10:38:05 GMT

Hi Carl,

But I need this because of same samples that I use as a base for my app. For example, in your documentation I cannot find this sample for battery voltage reading or this one with temperature sensing and sending data via BLE. Because all of these things, I asked you if it is possible to use both of them in same directory?

Best regards,

Adnan.

RE: How to parse and read JSON file correctly?

Carl Richard — Tue, 13 Oct 2020 10:35:33 GMT

Hi!

Sorry, did not mean to confuse youI recommend that you install nRF Connect SDK (which includes Zephyr) from scratch, as described in this guide. It could also be that your current Zephyr installation will interfere NCS, so if it's not needed I recommend uninstalling it.

Best regards,
Carl Richard