DWM1001 position interpretation

Wireless Connectivity Ultra-Wideband
1

Hello Community

I am just getting started with the DWM1001 module and communicate over the uart API with a STM microcontroller. At first, I’m trying to get the position of the module. For testing purpose, I define in shell mode the coordinate aps 0;1;2 and try to get it right in generic mode. When I send the TLV command to get the position, I will receive 0;16777216;33554432;100. So my conclusion is, that 1mm is 16777216, but that doesn’t really make sense and in the datasheet is written, that the coordinates will be send in mm.
So to my question: How do I interpretate the position right?
Is the bit 32 for 2^31 mm? But why do I get this kind of position?

thanks for the help in advance.

regards
Benjamin

2

Hi @Benji
the resolution is in 1mm so you should read back the value also in mm. Which commands do you use?

Cheers
JK

3

Thanks for replying
Meanwhile the problem has been solved. The API-Command I have send to the module was dwm_pos_get, or in TLV 0x02, 0x00. My interpretation of the answer was wrong, because I forgot that the data is in little endian, so I swapped the MSB with the LSB and so I got to the wrong number. Now I get the position right.

regards
Benji