Using nrf BLE with DWM1001-DEV

[dfbdfb]

Hi,

I am currently working on a project similar to this thread:  Using nrf BLE with DWM1001-DEV 

However, the thread stop updating. I followed what Einar suggested, to merge the Decawave example code to nRF52 SDK 17.1. 

The ss_twr_init example will be copied into the ble_app_uart example.

github.com/.../ss_twr_init

I met several issues while doing this.

First of all, I want to ask about the FreeRTOS. There are several errors come with the FreeRTOS part when I merge them. I want to know how to use FreeRTOS in a ble_app_uart example.

What does FreeRTOS do? Can I remove it from the project?

Thanks!

[Sigurd Hellesvik]

Hi,

FreeRTOS is a Real Time Operating System providing functionality for Real Time functionality such as Scheduling.
See https://freertos.org/ and https://freertos.org/FreeRTOS-quick-start-guide.html for more information on this.

From the sample you linked, I guess you can disable FreeRTOS by changing line 49 in sdk_config.h.

Regards,
Sigurd Hellesvik

[dfbdfb]

Thank you for your answer!

I tried to disable FreeRTOS and it works fine now!

If I want to get saadc output and send the data through ble_nus service at a high throughput, will the continuous SPI communication with DW1000 get influenced? How should I arrange the IRQ priority for them? 

Thanks again!

[Sigurd Hellesvik]

Hi,

It is usually not an issue to use SPI in parallel with the SoftDevice.

If you use the SPI Master driver, such as in the SPI Master example, the CPU only has to communicate with the SPI occasionally, and it is unlikely that the SoftDevice will delay these enough for it to impact the SPI device.

But as it is a timing issue, I recommend that you test this yourself.

Regards,
Sigurd Hellesvik