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Starting swra347 experiment, help needed

Jeremy Snow
Prodigy 150 points
Other Parts Discussed in Thread: CC2540

I am looking to recreate the experiment shown in swra347 and I have tried to attempt it once with no luck. I have everything required. Oscilloscope, cc2540 mini device kit, 10 ohm resistors, voltage meter, power supper and all the necessary software except for that my IAR 7.60 software has expired. Is there another option to altering the code and downloading it to the slave.

 

I also notices in the software there were if statements that were labeled mini cc2540 kit, what is the exact change i need to make to my code to continue to perform measurements, exact details would help. Thank you for your time.

 

Jeremy Snow  

  • 0
    TI__Genius 17975 points

    You can use the hex file that is included with the software (C:\Texas Instruments\BLE-CC2540\Accessories\Hex_Files\cc2540_ble1.0_slave_keyfob.hex); however this hex file will not have the periodic event removed. Therefore once every 5 seconds you will see some additional processing from the periodic event. If this event occurs between connection events, it will be easy to spot on the oscilloscope, but if the event occurs very close to the start or end of a connection event, the post and pre-processing time may seem longer than it actually is, because the periodic event processing will occur immediately before or after the link layer processing. Therefore your measurements may not be accurate. To get pure measurements that only account for the BLE stack, you will need to modify the software.

  • 0 in reply to Willis1
    Prodigy 150 points

    Thank you very much for your response, that helps a lot. I do see the connection events and every 5 seconds i see the periodic event the only problem is, is that now i obtain this wave instead of the predicted one shown in the experiment document, could this be a setting with the oscilloscope?  Thank you for your time.

     Jeremy Snow

    .

  • 0 in reply to Jeremy Snow
    Expert 1175 points

    HI

    Seems to be like it, you can see the different phases

    Preprocessing

    Rx

    Tx

    Postprocessing

    PM2 

    Have you removed the battery capacitor.It might be killing the peaks