2 Replies Latest reply on Oct 16, 2020 3:32 AM by KeTa_1341526

    [CYBT-333047-02] There is a problem with SPP reconnection when using EZ-Serial F/W

    KeTa_1341526

      Hello,

       

      I am evaluating CYBT-333047-02 mounted on my board.

      But there is a problem. (The number of occurrences is 5/10 systems.)

       

      <Environment>

      - EZ-Serial Firmware v1.1.14

      - SPP

         * It is set to ".CYSPPSP, E=0" (CYSPP on the BLE side is disabled.)

      - The configuration being evaluated

         [Laptop A] <=(USB)=> [USB - Serial Cable] <=(PUART)=> [Board with CYBT-333047-02] <=(BR/EDR)=> [Laptop B]

         * Both Laptops use Teraterm to check serial data.

       

      <Steps to cause problems>

       

      1. Connect [Laptop A] and [board] with a [USB - Serial cable], and turn on the power of [board].

      2. Launch Teraterm of [Laptop A] and connect COM port.

           * BOOT event message (of EZ-Serial F/W) is displayed in Teraterm of [Laptop A].

      3. Search for CYBT-333047-02 in [Laptop B] and perform pairing (Justworks).

       

           * P/PR/ENC/PKD event message (of EZ-Serial F/W) is displayed in Teraterm of [Laptop A]

      4. Launch Teraterm of [Laptop B] and connect COM port.

           * BTCON event message (of EZ-Serial F/W) is displayed in Teraterm of [Laptop A].

      5. Data can be sent from [Laptop A] to [Laptop B]

           Data can be sent from [Laptop B] to [Laptop A]

      6. Dis-connect COM port in Teraterm of [Laptop B].

           * BTDIS event message (of EZ-Serial F/W) is displayed in Teraterm of [Laptop A].

      7. re-connect COM port in Teraterm of [Laptop B].

           * BTCON event message (of EZ-Serial F/W) is displayed in Teraterm of [Laptop A].

      8. Data can't be sent from [Laptop A] to [Laptop B]

           Data can be sent from [Laptop B] to [Laptop A]

       

      The problem is step 8, and when I reconnect to 7, I can't send data from [Laptop A] to [Laptop B].

      This doesn't happen on all boards, so I think there may be a Hardware factor.

      (XRES is released 50ms after VDDIN stabilizes.)

       

      However, it can also be a problem with the EZ-Serial F/W.

       

      Is this kind of phenomenon happening?

       

      I also want to improve this problem as soon as possible.

       

      Best regards,

      TK