connection btw modem simcom7000 and nrf52840-dk

[rdmeneze]

HI!
I'm basically new with zephyr and etc. 

I'm developing a project with a nrf52840-dk board and a simcom7000 modem (assembked in a arduino expansion board) and basically I don't know how to configure the devicetree. The modem is very similar to simcom7080 and I think that should be possible to use the same driver to do some tests. 

can someone give me some directions? 

thanks in advance. 

Rafael Dias 

[Simonr]

Hi

If you're new to the nRF Connect SDK and Zephyr RTOS I'd strongly recommend checking out the DevAcademy, where we have multiple free courses explaining the fundamentals of the nRF Connect SDK and how to get started developing. How to set up the devicetree is also its own topic here. https://academy.nordicsemi.com/ 

What serial communication does the simcom board support? I'd recommend checking out SPI if that's an option for you. As it is a simple and fast method of serial communication.

Best regards,

Simon

[rdmeneze]

I did these courses. 
Well, the simcom board have a serial communication and a PWRKEY signal. 
The serial communication is connectes to the D1 and D0 arduino signals and the PWRKEY is connected to the D12.  

[rdmeneze]

I'm trying to use the Device tree editor and I don't know where I can add the modem... 

[Simonr]

Hi

From what I can see, the SIM7000 supports both UART and I2C, so I'd recommend using either of those for communication between the nRF52 and SIM7000. You'll need a driver file for the SIM7000 to set this up, which Zephyr/NCS doesn't seem to have by default. If you're not comfortable writing a driver like this on your own and the manufacturers of this device don't have an official C driver for it, I recommend searching for an open source one in GitHub, and using for example the UART driver sample in the Zephyr project to communicate with the SIM7000: https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/samples/drivers/uart/echo_bot/README.html. This sample just loops data back, to the nRF52 so you need to use some free pins to connect to SIM7000. 

Best regards,

Simon

[rdmeneze]

There is a very similar modem from SIMCOM: SIM7080. I'd like to start with it before write my own driver for SIM7000 modem.