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BT UART communication failed in TIVAC

Ravikiran HV
Mastermind 8715 points


Hi all,

I am using CC256X Bluetooth module with EK-TM4C129XL launchpad and trying to run a Bluetooth demo.  Bluetoth is expected to work out of box using Bluetopia + TIVA ware provided by stone street one.  But, it doesn't.
 It fails in UART communication.

Please find device operation sequence below.

  • Power ON TIVAC
  • Power ON CC256X BT.
  • After CC256X power ON RTS of CC256X goes LOW.
  • Sending start sequence from TIVAC board via UART using HCI commands.
  • Now TIVA C waits for the response from the BT module and there is no response.


Same CC256 BT module I tried with TIVAC Development KIT instead of Launch pad. Here BT demo works out of the box.

I don't see any issue with stone street one stack what  I have and also CC256x BT module because, this combination is working fine on Development kit. But, I am not able to understand why it fails in TIVAC Evaluation KIt launchpad?

How to get UART up for the TIVA C device? Is there any jumper settings I need to check? I checked the beginers guide and configured UART4 instead of CAN as suggested in the guide.

Looking forward for help from TI Experts. 

Appreciate any help on this.

Thank you

  • 0
    Mastermind 8715 points

    WE found that call was hanging in Default  Interrupt handler. We used UART4 for HCI communication and there was no interrupt registered for that. UART RX/TX interrupts were assigned for UART3. So we changed this to UART4 and we could see SPP/SPPLE demo up on TIVAC.