Radio Transmitter/Receiver example modification

[techietech]

Hello !!

I want to use Radio transmitter/ receiver example in my custom board which is used for BT remote control battery powered. I have added 10 buttons on my board and define it on example. I want to send UUID code so that it could be distinguished. 

Now after modifying the code I am getting same values on each button pressed. I am not able to find how the transmitter example sending values. Anyone help me out with :

1. Sending UUID with transmitter example.

2. Sending same data on each button press as it was doing with the default example.

3. As it is battery powered, I want to put it on low power mode so that battery could run long last.

I will appreciate any response.

Thanks 

[ovrebekk]

Hi 

If I understand you correctly you want to implement a proprietary radio protocol rather than use a standard one such as Bluetooth?

If you want to do proprietary RF I would recommend you use the nrf_esb library, rather than start with the very simple radio transmitter/receiver examples. 

The esb_ptx and esb_prx examples in the \nRF5_SDK_17.0.2_d674dde\examples\proprietary_rf\ folder show how you can get started using the nrf_esb library. 

Out of the box these examples are not very low power, but I would recommend getting the basic functionality in place before you start to focus on power optimizations. 

Best regards
Torbjørn

[techietech]

I just want to broadcast message from transmitter to receiver for now from my custom board. For that I have changed for 10 buttons and changed the needful thing after checking all the headers files. When I am sending I am getting the output like :

The contents of the package is 251 on each button press. 

ovrebekk said:

but

[ovrebekk]

Hi

Can you attach the code you use for updating the RF payload based on the button presses?

Best regards
Torbjørn

[techietech]

I am using RF radio transmitter / receiver code from nRF5_SDK_17.0.2_d674dde sdk.

[ovrebekk]

Hi 

You stated earlier that you modified the code. Are you able to share these modifications with me so I can have a look at what you have changed?

I can make the case private if you want, in case you don't want to share your code in a public case. 

Best regards
Torbjørn

[techietech]

The changes I have done : 

1. Define for 10 buttons instead of 4 buttons ( as default example) in  pca10040.h

2. Added definitions everywhere as it is defined for 4 buttons in example code.

3. changed GPIOTE_CONFIG_NUM_OF_LOW_POWER_EVENTS 10 in sdk_config.h

4. My gpios for buttons are 6 to 12, 15 to 17. Also changed.

 

Hope this information would be enough. Haven't changed too much in code apart from above. 

Thanks

[ovrebekk]

Hi 

The critical thing is what you write into the packet variable before you call send_packet(). 

Have you used the debugger to check if this variable contains the values you expect when you press the different buttons?

Best regards
Torbjørn

[techietech]

Hi

Yes I had checked. The variable contains the same values. I have managed to resolve that using bsp_evt_handler function. Now I want to send string and MAC Address of the device. How could I do that? I tried but at receiver end i m getting garbage values.   

[ovrebekk]

Hi 

You can change the example to define a byte array for use as a TX buffer, rather than a single variable. 

Then you can copy your other data fields into this byte array, using the memcpy function for instance. 

Depending on how much data you want to send you need to scale the byte buffer accordingly, and also update the PACKET_STATIC_LENGTH define in radio_config.h to allow you to send more than one byte. 

Best regards
Torbjørn