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Scan in a Single Channel

FA

Hi,

As mentioned in this post: devzone.nordicsemi.com/.../

the struct ble_gap_adv_params_t --> ble_gap_adv_ch_mask_t give the option to turn any advertising channel OFF. I tested this approach and could advertise on only one channel.

The problem that I found was in scanning for this packet. When I'm using 3 channels for advertising, the scanning program is ALWAYS able to pick the advertising packet. But when I'm using 1 channel for advertising it misses some. Is there any way to program the scanning so that it only looks on a single channel? Can this problem be due to values of scan interval and scan window (I'm setting them equal to continuously scan)?

In the description of ble_gap_adv_ch_mask_t (infocenter.nordicsemi.com/index.jsp it says "Channel mask for RF channels used in advertising and scanning". But I could only found a place in the ble_gap_adv_params_t to pass it, and ble_gap_scan_params_t doesn't have this field.

So how can we set this feature for scan mode?

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  • 0

    Hi FA,

    Scanning with selective channel(s) is not supported yet. I will report internally to fix it in the documentation.

    Thanks for reporting.

    If you want to do scanning on single channel, you may want to have a look at this observer example. We do scanning manually on S110 softdevice using timeslot feature.

    ble_app_proximity - Observer.zip

  • 0 in reply to Hung Bui

    Hi Hung, I tried to replace the scanning parts of my program with the one in main.c of the observer example. Again the example is SDK 6 I think and I'm using SDK 9, so a couple of errors came but I could get rid of those. However, I'm getting one error, which I don't know how to solve. It says ("SWI2_IRQHandler multiply defined by softdevice_handler.o and main.o). I had a similar error for SWI0_IRQHandler in main.c and app_timer.o. I changed all the SWI0 in main to SWI1. One error was gone, but there is no SWI2_IRQHandler defined in my main. So, where the error is coming from? Is it OK just to change the software interrupt numbers to get rid of duplicate definition error?

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  • 0 in reply to Hung Bui

    Hi Hung, I tried to replace the scanning parts of my program with the one in main.c of the observer example. Again the example is SDK 6 I think and I'm using SDK 9, so a couple of errors came but I could get rid of those. However, I'm getting one error, which I don't know how to solve. It says ("SWI2_IRQHandler multiply defined by softdevice_handler.o and main.o). I had a similar error for SWI0_IRQHandler in main.c and app_timer.o. I changed all the SWI0 in main to SWI1. One error was gone, but there is no SWI2_IRQHandler defined in my main. So, where the error is coming from? Is it OK just to change the software interrupt numbers to get rid of duplicate definition error?

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