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CC1101+ CC1190 Receive problem

govindveera
Intellectual 395 points
Other Parts Discussed in Thread: CC1101, CC430F5137, CC1190, MSP430F2350, MSP-FET

     In one of my designs, I am using MSP430F2350+CC1101+CC1190 as a receiver(Reader) and CC430F5137(Tag) as a transmitter. The tag sends its ID for every 5seconds. The reader receives and sends out the received data via UART. I am using MSP-FET430UIF as developement tool. I am using the same reader schematic in many of my designs. So there is no problem in schematic.

     My problem is in this particular design the reader is not receiving data when it is disconnected from MSP-FET430UIF. If it connected it is receiving. I am not running MSP430 from MSP-FET430UIF. It is independent. Why is this happening? The same firmware working without any problem in other designs, so I cant doubt my firmware right?

Regards,

Govind.V.

  • 0
    TI__Guru**** 317180 points

    Bit stupid question, but have you measured the voltage on the board when disconnecting the MSP-FET?

  • 0 in reply to TER
    Intellectual 395 points

     We used USB to RS232 converter to grab data from MSP.

    This conveter had some grounding ( didnt connect PC's GND to my system' GND )  issues. So when I connect MSP-FET which share the same USB to RS232 converter connected PC, my system grounded to PC via MSP-FET. This is the problem.

     Sometimes stupid things teach us to do basic things right.

    Thanks for your reply.

  • 0
    TI__Genius 12735 points

    govindveera said:

         My problem is in this particular design the reader is not receiving data when it is disconnected from MSP-FET430UIF. If it connected it is receiving. I am not running MSP430 from MSP-FET430UIF.

    Could you also elaborate what you mean here. Does the receiver only stop receiving when you disconnect the debugger while the code is running or does it not receive when the board is powered up without the debugger connected at all. 

    Some IDE's have the option to either leave the MCU running when debugging is stopped or let the code freeze when debugging is stopped.

    govindveera said:

     I am not running MSP430 from MSP-FET430UIF.

    The  MSP-FET430UIF is a debugger for the MSP430 and has no connection to the radios. The CC1101 act as a peripheralfor the MCU and all SW debugging will go through the MSP. 

  • 0 in reply to Martin B
    Intellectual 395 points

    The problem is solved.

          As I told in my previous reply, ground connectivity between PC  and my system( MSP+CC1101+CC1190) was not proper, that caused problem.

        This ground discontinuity  was corrected  MSP FET's USB cable, as both USB to RS232 and MSP-FET connected in same PC.

         I couldnt able to judge the system whether it was fine or not because I thought MSP stop working whenever I am removing MSP-FET.

         I hope you can understand my point.