Communicating to Bridge Node with SPI

Hi :slight_smile:

I´m trying to comunicate with the Bridge Node using an Arduino. I saw in “Product_and_Design_Documents” -> “DWM1001_System_Overview.pdf” (page 13) that the Bridge Node comunicate with the Linux Host by SPI TLV, but there´s no TLV to get the informations that the bridge sends. How can i comunicate with the Bridge by SPI?

Hi Rarafa,

The interface with the bridge node is currently not documented, so there is no straightforward way to communicate with it.

Thanks
Yves

Hey Yves_Bernard.

I was reading the “Dwm1001 Firmware API Guide” and i found the TLV command “dwm_backhaul_xfer”. What about it? Can i receive the datas from the Bridge node with this?

Hi,

Well the issue is that the data to send with the dwm_backhaul_xfer api is not documented, making it not very useful.

Yves

Hi,

Sorry to disturb but I can’t get any reply from the forum for the question I posted and base on the questions you answered in the forum, I believe you might have better idea on what I faced.

I also understand that quite some posts asking similar questions but the answer is “the backhaul command is not documented, making it not useful”, but could I have the pseudocode on how to set the LED from the start of the initialisation to turning off the LED for example?

I have a setup of 3 anchors, and 2 tags, which works fine with the raspberry bridge with the dwm image. From the web interface, I could set the setting on the Tags, such as turning the LED off, and other setting without using the android apps via HP.

Now I am trying to use own program to communicate with the Tags from the Bridge (RaspPi) without using the DWM daemon (either I kill it or use raspbian image), after setting up all the necessary spi module etc, I am able to read the status, location, etc from the Tags with the backhaul xfer command (0x37 0x02 …) and decode them to what I need, but I am now stuck to send the command to change the setting of the Tags such as turning the LED off.

From the searching and experiments, I notice that the daemon is running through some initialization for the UMB network, such as the loop from dwm_nodeid_get, dwm_panid_get, dwm_init_cfg_get, dwm_cfg_get, dwm_cfg_anchor_set, dwm_reset… and another loop of setting the panid and secure key etc… .

I also notice following the initialisation, there are some xfer command which sent data to the tags, and also the anchors, but i tried to mimic the sequence but i still fail to set the LED of the tag.

Hope I could get some answer for this.

Thanks.

Regards,
CL

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Hi chinluh,

Could you please elaborate about the communication using the backhaul? I can’t wrap my head around the way the data acquired needs to be decoded and in what kind of sequence it should be read.

Respectfully,
Audris