CC13xx contiki example - default channel

Phil Vergers

I am wanting to use the Contiki web demo (http://processors.wiki.ti.com/index.php/Cc26xx_sw_examples) with cc13xx:

So far I have not had success in connecting 2 srf06 with cc13xx EM , 1 as web-demo, the other as rpl-border-router.

I am concerned with the default channel being set to 25 - this seems appropriate for 2.4GHZ band, but not for sub GHz (802.15.4 does not have 25 channels below 1GHz).

1) How do I set the frequency for CC13xx - for use in Australia so somewhere 915 - 925 MHz range?

2) Are there other tweaks necessary to get cc26xx-web-demo working for cc13xx out of the box?

Secondary Issue - It seems that rpl-border-router (ref: https://github.com/contiki-os/contiki/tree/master/platform/srf06-cc26xx#cc13xxcc26xx-border-router-over-uart) will compile ok for BOARD=srf06/cc13xx but not for srf06/cc26xx. Can someone confirm if they have had success in using rpl-border-router on cc13xx and cc26xx? I had it working ok with contiki 2.7, but not so far with 3.0.

over 10 years ago

0 YiKai Chen over 10 years ago

Guru 735695 points

1. Current Contiki for CC13XX only runs on 868 MHz.
2. You can refer to steps in sunmaysky.blogspot.tw/.../contiki-subg-hz-6lowpan-on-cc1350.html to run Contiki CC13xx example.

0 YiKai Chen over 10 years ago

Guru 735695 points

1. Current Contiki for CC13XX only runs on 868 MHz.

2. You can refer to steps in to run Contiki CC13xx example.

0 Phil Vergers over 10 years ago in reply to YiKai Chen

Intellectual 660 points

Thanks YK - your example is using 6LBR, I am trying to get it running with rpl-border-router (simpler with my set-up). I am interested if anyone has had success.

So I guess that the Channel number is left set to 25, and this uses 868MHz.

868MHz should be Channel 0, Does this mean the channel number is ignored for CC13xx build??

0 YiKai Chen over 10 years ago in reply to Phil Vergers

Guru 735695 points

Yes, I think the channel number is ignored for CC13xx build.

0 Jonas Norling over 10 years ago

Prodigy 10 points

I was also looking for information about what the centre frequency is in the Contiki port (for srf06/cc13xx), and found this post.
It turns out that the CC13xx port uses the radio in "proprietary mode", so if you dig around a bit in prop-mode.c and dot-15-4g.h you can figure out how to set the band and frequency to use. In the default configuration it will run at 868.125 MHz, which maps to channel number 25 for some unknown reason. I was able to move it to another frequency by changing RF_CORE_CONF_CHANNEL.

0 YiKai Chen over 10 years ago in reply to Jonas Norling

Guru 735695 points

Thanks for sharing this detail to us.

0 Phil Vergers over 10 years ago in reply to Jonas Norling

Intellectual 660 points

Thanks Jonas,

I had since found some information on it here:

http://processors.wiki.ti.com/index.php/Cc26xx_sw_examples

Changing the RF Band

The default RF band used is at 868 MHz, In order to change the RF band one has to edit the file ~/contiki/platform/srf06-cc26xx/contiki-conf.h to include the following line to change to XXX MHz #define DOT_15_4G_CONF_FREQUENCY_BAND_ID DOT_15_4G_FREQUENCY_BAND_XXX. Supported frequency bands are listed in the file ~/contiki/cpu/cc26xx-cc13xx/rf-core/dot-15-4g.h

0 YiKai Chen over 10 years ago in reply to Phil Vergers

Guru 735695 points

Yes, this information was just updated two weeks ago on October 21th 2015.

0 Rushabh Shah52 over 8 years ago in reply to Jonas Norling

Intellectual 270 points

I tried changing channels on both gateway (/usr/lib/6lbr/bin/nvm_tool --update --channel XX /etc/6lbr/nvm.dat) & client (RF_CORE_CONF_CHANNEL), but for some reason it only seems to work in channel 25 in 868mhz band. Any help on why this maybe happening?

0 YiKai Chen over 8 years ago in reply to Rushabh Shah52

Guru 735695 points

0 Rushabh Shah52 over 8 years ago in reply to YiKai Chen

Intellectual 270 points

I don't wish to change the band, just want to change the channel in 868mhz band. Only channel 25 seems to be working, while as per dot-15-4g.h there are 33 channels in this band

0 YiKai Chen over 8 years ago in reply to Rushabh Shah52

Guru 735695 points

Do you also change RF_CORE_CONF_CHANNEL in slip radio?

0 Firefighter over 8 years ago in reply to YiKai Chen

TI__Genius 12480 points

The CC13xx port for Contiki follows the IEEE802.15.4 standard for channel allocation. Note that 15.4g is now part of the IEEE802.15.4, meaning that sub-1GHz channels has been extended. The channel allocation depends on which frequency band you are using, please see contiki/cpu/cc26xx-cc13xx/rf-core/dot-15-4g.h

The default band is DOT_15_4G_FREQUENCY_BAND_863

This gives Channel 0 @ 868.125MHz:

#elif DOT_15_4G_FREQUENCY_BAND_ID==DOT_15_4G_FREQUENCY_BAND_863
#define DOT_15_4G_CHANNEL_MAX         33
#define DOT_15_4G_CHANNEL_SPACING    200
#define DOT_15_4G_CHAN0_FREQUENCY 863125
#define PROP_MODE_CONF_LO_DIVIDER   0x05

-Jonas

0 Rushabh Shah52 over 8 years ago in reply to YiKai Chen

Intellectual 270 points

Changing RF_CORE_CONF_CHANNEL solved the problem! Thanks

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CC13xx contiki example - default channel