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LP-CC2652R7: Inquiry

Part Number: LP-CC2652R7
Other Parts Discussed in Thread: CC2652R7

Hi,

Good day. Our customer has an inquiry about the LP-CC2652R7. Kindly see below.

I tried TI's demo code, uartecho_LP_CC2652R7_nortos_ccs. TxD works, but RxD won't. would you tell me why?

this is how I import example:
open CCS, click project tab, then project wizard( resource explorer )
my LP-CC2652R7 board is connected to my PC, so chose LP-CC2652R7 board.
then there are a big list of example, scroll down and find
uartecho, TI driver, noRTOS,
import

Would you try my way? and let me know the results.

Can you please help us? Thank you.


Regards,

Cedrick

  • Hi Cedrick,

    That is the correct way of importing a project. Can you clarify what the customer means by "TxD works, but RxD won't"? The way this example works is that you transmit UART data to the device (via RX) and the device transmits the same data back (via TX). So if the example works, then both RX and TX should be functioning. What does the customer see when they try to demo the project? Can you verify if they are setting up the serial session with the settings shown here: https://dev.ti.com/tirex/explore/node?node=AC4sMk8g3izMsW8VqexTTw__BSEc4rl__LATEST

    Best Regards,

    Jan

  • Hi Jan,

    Thank you for your response.

    Kindly see the feedback from our customer:

    When I mean LP-CC2652R7 dev kit RxD doesn't work. meaning it won't function.
    I connected TxD , RxD to a PC uart, running teraterm. teraterm received Data from dev kit correctly. but type on teraterm, dev kit won't get data, watch the RxD siganl. the waveform is deformed. seems RxD is driven the signal. without RxD connected, the waveform from PC's output is correct.
    Please try on your side, see what you get.

    Regards,

    Cedrick

  • Hi Cedrick,

    Please ensure that the Teraterm settings are set to the following:

        Baud-rate:  115200
        Data bits:       8
        Stop bits:       1
        Parity:       None
        Flow Control: None

    If the settings match, then can you provide us with a logic trace capture of the TX and RX lines?

    Best Regards,

    Jan

  • Hi Jan,

    Good day.

    Here's their feedback:

    the setting is correct. as teraterm receive data correctly. the RxD waveform is attached. you can see the signal goes low to 2V, it should go to 0V( where the yellow arrow, on the left, is )

    Regards,

    Cedrick

  • Hi Cedrick,

    I have a couple of follow up questions. Is the LaunchPad being powered externally or via the USB cable? Can take another waveform picture, but this time include the TX trace? If possible, in the image can you show activity on both the RX and TX lines to compare the voltage values of the logical high and low for both traces? Can you provide an image of the measurement set up? Is this behavior present on all UART examples or just the uartecho example?

    Best Regards,

    Jan

  • Hi Jan,

    Kindly see below the feedback from our customer.

    I have a couple of follow up questions. Is the LaunchPad being powered externally or via the USB cable? Can take another waveform picture, but this time include the TX trace?

    what's the point of this? TX is correct. teraterm got the string sent from lunchpad.

    If possible, in the image can you show activity on both the RX and TX lines to compare the voltage values of the logical high and low for both traces?

    as I said, there is no issue for lunchpad send data, PC got it right.

    Can you provide an image of the measurement set up? Is this behavior present on all UART examples or just the uartecho example?

    I only tried on 1 uart with TX example.

    you have asked me do this and that too much, and does not make sense. Why don't you try something on your side, make sure it works. maybe my new purchased board is just a defected one..


    Can you please help us further? Thank you.


    Regards,

    Cedrick

  • Hi Cedrick,

    I was able to successfully build and flash the the uart2echo_LP_CC2652R7_nortos_ccs example on the 5.40 SDK. The project was able to run on my LP-CC2652R7. I had no issues sending UART to the LP via the terminal and receiving the same UART back out which showed the RX and TX pins working as expected.

    q

    Can you provide the SDK you are using? If not on 5.40, then can you verify if the issue is still present in 5.40?

    Best Regards,

    Jan