Cobra II Wifi and NRF24L01 Initialization and Configuration

NETMF & Gadgeteer
1

Hello,

I am trying to use NRF24L01 module on Cobra II wifi board via SP1 that have carried to expansion pins. I have tried many configurations for ChipEnable and ChipSelect pins. All the changed pinouts I can initialize SPI interface and NRF24L01 driver.

In all my tries I cannot read back the module RX Address using GetAddress method to verify my configuration.

You may find my configuration for the testing and the code snippet below. I will be glad if you can help me on this issue. Thanks in advance and Kind Regards.

    public class Program
    {
        static NRF24L01Plus _module = new NRF24L01Plus();
        static byte[] moduleAddress = new byte[] { 0x02, 0xCC, 0xDD, 0xEE, 0xFF };
        public static void Main()
        {
            _module.Initialize(SPI.SPI_module.SPI1, (Cpu.Pin)11, (Cpu.Pin)16, (Cpu.Pin)1);
            _module.Configure(moduleAddress, 2);

            var address = _module.GetAddress(AddressSlot.Zero, 5);

            var verify = address.ToString();

            Debug.Print(verify);
        }

    }
2

welcome to the forum!

what is actually happening? an exception? device locks? incorrect address?

3

Thanks for the prompt reply.

I am not receiving any exception or device lock. Only the situation I discover is the RX Address I read back is full of 0xFF or 0x00. This is also changing without any pattern.

I also want to give further information for the pins that I have used.

P0.11 - Chip Select
P0.1 - IRQ
P0.16 - Chip Enable

I have made my connections directly with wires and did not use either pull up or pull down resistors.

These are the extra information that I give further.

Thanks.

4

Can you take a close picture of your wiring?

5

Hi Architect,

Back and front images of my prototyping board according to your request.

6

Did you connect grounds on the module and Cobra together?

7

Yes. I have used Ground line and VCC (3.3V) line of Cobra for the Module.

8

I would check the continuity between signals as well to make sure you don’t have cold solder joint in your wiring.

9

Hi Architect,

I have checked all the solders and refreshed them. Also cleaned all the remaining fluxes between soldered pins but nothing changed.

After initialization if I try to read the address it returns full of 0xFF in all five bytes.

10

Running out of options here. Is SPI1 wired correctly. Try SPI2.

11

Hi Architect,

Instead of SPI2 I have tried SPI3 but nothing changed.

If I find the solution I will also send here.

Thanks for your special support.

Kind Regards.

12

I didn’t help much, but you are welcome ! :slight_smile:

13

AtillaBilgic, what driver/module is this you are using?