NRF52 Dallas slave (1-wire) with BT

RE: NRF52 Dallas slave (1-wire) with BT

Jørgen Holmefjord — Thu, 22 Mar 2018 12:56:44 GMT

It might be possible, but I guess it depends on the length of the transfers. Please have a look at the timeslot API tutorial. If you are having issues with timeslots, please post a new thread about your issues.

RE: NRF52 Dallas slave (1-wire) with BT

RenatoMorelli — Thu, 22 Mar 2018 12:45:29 GMT

Hi Jørgen,

Thanks for the reply. Do you know if it would it be possible to achieve if I made readings through the Timeslot API? I could ask the softdevice for some continuous time, theoretically, and have an extension with enough time to send and receive data.

I'm trying this, but I'm having some problems from various sources.

RE: NRF52 Dallas slave (1-wire) with BT

Jørgen Holmefjord — Thu, 22 Mar 2018 12:28:24 GMT

As I mention above, most likely not. The protocol will have to wait for the softdevice events to complete before reading/writing GPIOs. You will then not be able to read incoming messages on the bus and respond appropriately.

RE: NRF52 Dallas slave (1-wire) with BT

RenatoMorelli — Thu, 22 Mar 2018 12:23:51 GMT

Hi Yuval,

I can make a One Wire peripheral work, but no along with BLE so far. I am wondering if it is possible to make them both work along.

I used this library, not too dificult to adapt.

Thanks,

Renato Morelli

RE: NRF52 Dallas slave (1-wire) with BT

Jørgen Holmefjord — Wed, 14 Feb 2018 10:37:38 GMT

Hi,

There is no hardware support for 1-wire in the nRF52 ICs. It looks like the implementation for nRF51 that I could find, is bit-banging the protocol. I'm not familiar with the details of the 1-wire specifications, but if it is timing critical, it will be hard to get this working perfectly together with the softdevice. The softdevice will always have highest priority, and will preemt any other tasks running on the CPU, when timing critical events must be handled. You can toggle GPIOs using PPI and GPIOTE peripherals, without use of CPU, but I don't think you will be able to implement the protocol using this.

Best regards,
Jørgen