nrf51 ble advertising

RE: nrf51 ble advertising

Carlos — Thu, 25 Jun 2015 19:30:01 GMT

Thank you, I already check the code and is exactly what I need.

RE: nrf51 ble advertising

Hung Bui — Thu, 25 Jun 2015 12:28:47 GMT

@Carlos: If you have a look at the ble_setup() function, in main.c in advertiser project, you can find that we don't use the softdevice to do advertising.

Yes it uses timeslot which is provided by softdevice, but other than that, the radio is set up manually and transmit the advertising packet also handling scan request and scan response directly on the radio. Please have a look at ts_peripheral.c, nrf_advertiser.c, ts_controller.c.

Of course you would need to stripout those code related to timeslot.

RE: nrf51 ble advertising

Ulrich Myhre — Thu, 25 Jun 2015 08:09:09 GMT

If you copy the RADIO0 configuration options from radio.c in the example I linked, and strip out the callback and state stuff, you will have the simplest advertiser you can get. You probably want a timer implementation to do multiple advertisements, and the blessed stack has support for this. It can also do callbacks when RX/TX happens in case you want to implement scan responses. In the simplest sense, you have to configure the radio fields (MODE, TIFS, PCNF1, CRCCNF, CRCPOLY, etc.), then set PACKETPTR to some uint8_t[39], put your data in there, then enable start TASKS_RXEN. If the READY->START SHORTS is set, the radio will automatically transmit the packet once it is ready. You have to repeat this for all advertising channels (37, 38 and 39).

This might sound complex, but I think "blessed" solves this in an easy-to-understand way.

RE: nrf51 ble advertising

Carlos — Wed, 24 Jun 2015 15:52:36 GMT

Hi Ulrich,

I will look in to this example, it appears as it does not use the softdevice at all so that are great news. Maybe, if you have some kind of example using the uESB library or baremetal, that would be great, thank you.

Best regards,

RE: nrf51 ble advertising

Carlos — Wed, 24 Jun 2015 15:50:05 GMT

Hi Hung,

I already looked into an example like this, the thing is I don't want to load the softdevice in the nRF51. I will be using the uESB library, but is a feature to have non-connectable advertising to send data to a smart device.

Best regards,

RE: nrf51 ble advertising

Ulrich Myhre — Wed, 24 Jun 2015 09:03:55 GMT

There is also this alternative implementation: github.com/.../ See the radio-broadcaster example specifically.

RE: nrf51 ble advertising

Hung Bui — Wed, 24 Jun 2015 07:57:02 GMT

@Carlos: This example use timeslot (provided by the softdevice) to access the radio directly and transmit advertising packet (directly without softdevice) when in a connection. You can follow what we did there to setup advertising packet. .