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Need Help! Problem when using CC2541 with TPS62730

FrankXu
Genius 3500 points
Other Parts Discussed in Thread: CC2541, TPS62730

Dear TI Engineer,

       I have a problem when using CC2541 with TPS62730.

       I use the P1_5 to control TPS62730. The input of TPS62730 is a stable 3.3V power supply.

       My program read/write the internl Flash of CC2541.

1、I keep P1_5 to low in the whole program, the TPS62730 output 3.3V. The function all goes allright: Connection allright, Read/Write charicteristics allright, Flash Read/Write allright.

2、I keep P1_5 to high in the whole program, the TPS62730 output 2.1V. I use oscilloscope to monitor the output, the 2.1V is stable.

      And Connection is allright, Read/Write charicteristics is allright. But when data is write into Flash and readback, the readback data is all 0xFF.

      Q1：Can't the internal Flash work allright under 2.1V?

3、I set P1_5 to high first, and then set "HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P1, HCI_EXT_PM_IO_PORT_PIN5 );" in initilization.

     Let OSAL to control P1_5.（I'm sure there is no other place using P1_5）

     I use oscilloscope to monitor the output, the waveform is 2.1V when Active and 3.3V when in PM2 mode, as expected. So I think the OSAL control P1_5 allright.

    The device can be seen in LightBlue. But when I try to connect it, the connection cannot be set up. But as described in 1 and 2, when using 2.1V or 3.3V stable output, the connection always can be set up and the Characterstics Read/Write are allright.

    Q2: What's the possible cause of this problem?(Flash Read/Write program is removed here)

    Wishing for your help and advice.

    Yours sincerely,

Frank

  • 0
    TI__Guru** 105180 points
    Hello,

    Are you able to debug with the CC debugger during flash programming?
    For the connection issue, do you have a BLE air sniff log?

    Best wishes
  • 0 in reply to JXS
    Genius 3500 points

    Hi JXS,

                Thank you very much for your reply.

                For Q1, I run it in CC debugger, during flash programming,but I can't find why the NV_Read result is 0xFF when powered with 2.1V, while NV_Read result is allright when powered with 3.3V.

                For Q2, I use the packet sniffer and get the log as follows:

    unconnected_HCI_EXT_MapPmIoPortCmd_v1.psd

    unconnected_HCI_EXT_MapPmIoPortCmd_v2.psd

    unconnected_HCI_EXT_MapPmIoPortCmd_v3.psd

  • 0 in reply to FrankXu
    Genius 3500 points

    And I tried the SimpleBLEPeripheral example program in TI BLE1.4.0 stack. I change the P0_7 to P1_5 because I use P1_5 in my board.

  • 0 in reply to JXS
    Genius 3500 points

    And I tried the SimpleBLEPeripheral example program in TI BLE1.4.0 stack. I change the P0_7 to P1_5 because I use P1_5 in my board.

    1. With POWER_SAVING disable and HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P1, HCI_EXT_PM_IO_PORT_PIN5 ); enable

        The VCC is keeping 2.1V. The device can be connected and access normally.

    2. With POWER_SAVING enable and HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P1, HCI_EXT_PM_IO_PORT_PIN5 ); disable

        The VCC is keeping 3.3V. The device can be connected and access normally.

    3. With POWER_SAVING and HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P1, HCI_EXT_PM_IO_PORT_PIN5 ); both enable

        The lightblue shows "The periperal disconnected while being interrogated" when try to connect.

        The waveform of VCC in 3 is shown in the following photo, which I think is allright.

        I think it's not a hardware problem, because of the results in 1 and 2. And now I'm using the SimpleBLEPeripheral example program, there should be no problem in software.

        I'm confused in this problem. Is there anybody who has succeeded with POWER_SAVING and HCI_EXT_MapPmIoPortCmd( HCI_EXT_PM_IO_PORT_P1, HCI_EXT_PM_IO_PORT_PIN5 ); both enable?

        Please help!

    Frank