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SimpleBlePeripheral, read and write value via UART

Steeve Sinigaglia
Intellectual 805 points
Other Parts Discussed in Thread: CC2541

Hello.

I use the simple ble peripheral project with serial interface. I don't know how can i read/write value from uart.

I parse my rx buffer, and in my case : 

    case APP_CMD_WRITE:
      
      pReq.handle = 0x25;
      pReq.offset = 0;
      if (GATT_ReadLongCharValue( 0xFFFE, &pReq, serialInterface_TaskID ) //i wanted use this for provoc a read cb...


But, don't work. I guess i am blind and the answer is easy, but i don't know what function to call for Read / Write a specific characteristic.

Thank's and best regards,

Steeve

  • 0 in reply to Steeve Sinigaglia
    TI__Guru** 105180 points
    Hi Steeve,

    Are you trying to read the Char value "over the air" from a server (i.e., you are implementing a GATT Client) or are you trying to obtain the value from your (server) application in response to a external Client that wrote the value? Did you use the CC Debugger to see what you are receiving from UART?

    Best wishes
  • 0 in reply to JXS
    Intellectual 805 points
    Hi Jeff,

    Read / write over the air it's ok.
    I want implement a function (parsing uart like 77 (serial id) 02(APP_CMD_READ) A0(like a UUID) 05(len to return)).
    And in the case A0, i think i have to call xxxxService_getParameter and specified the number of characteristic, and my len.

    In other words, i want to send from my server (external MCU) :
    a function who said "tell me the value of characteristic AA A1" and the cc2541 answer back from UART the value, example : "00 01".

    Thanks
  • 0 in reply to Steeve Sinigaglia
    TI__Guru** 105180 points
    Hi Steeve,

    Sure, thanks for clarifying. Yes, you would use the getParameter method to read the current value and not use any GATT_xxx APIs (although loopback handle would work). What is your issue? Are you able to parse the UART cmd correctly?

    Best wishes
  • 0 in reply to JXS
    Intellectual 805 points

    Hello JXS.

    Thank you.

    getParameter call read_cb function ?

    Because in my read_cb function/write_cb function of each service, i send the value from UART.

    Example, when on my Android Phone, i write on characteristic A0, the value 00 05 48, my external mcu receive :

    A0 00 05 48

    I have understand this : read/write  call read_cb / write_cb. Both call get / set parameter.

    My question is : if i just call get paramater. How the answer is said by default ? UART ? Else, where i have to implement get paramater call back ?

    Thanks and best regards

  • 0 in reply to Steeve Sinigaglia
    Intellectual 805 points 
     Seems working ! I put my code here for people who need


     case APP_CMD_READ:
    switch (rxSerialPkt.data[0]){
    case 0xAA : //ID CHARACTERISTIC
      uint8 param = rxSerialPkt.data[1]; 
      uint8 len = rxSerialPkt.data[2]; // Need to know how much to return
      uint8 data[20];
      stat = yourService_GetParameter(param, (void *)data);
      if (stat == SUCCESS)
        HalUARTWrite(NPI_UART_PORT, (uint8*)data, len);
      else
        stat = INVALIDPARAMETER;
      break;
    }
    break;

    Thank' you JXS

  • 0 in reply to Steeve Sinigaglia
    TI__Guru** 105180 points
    Hi Steeve,

    Glad to hear it's working!

    Best wishes