LAUNCHXL-CC1310: Not receiving the byte properly in UART in Callback mode.

Hello,

I am working on "UART" of CC1310 LP and with collector code.

CCS Version 10

simplelink_cc13x0_sdk_4_20_00_05.

I am missing out some character as shown in below shared screenshot those characters are replaced with <0x80>.

In some cases , when i am debugging by placing breakpoint at line no 6(If statement)  in uartRxCallback function then i am getting the desired output.

const UARTCC26XX_HWAttrsV2 uartCC26XXHWAttrs[CC1310_LAUNCHXL_UARTCOUNT] = {
    {
        .baseAddr       = UART0_BASE,
        .powerMngrId    = PowerCC26XX_PERIPH_UART0,
        .intNum         = INT_UART0_COMB,
        .intPriority    = ~0,
        .swiPriority    = 0,
        .txPin          = CC1310_LAUNCHXL_UART_TX,
        .rxPin          = CC1310_LAUNCHXL_UART_RX,
        .ctsPin         = PIN_UNASSIGNED,
        .rtsPin         = PIN_UNASSIGNED,
        .ringBufPtr     = uartCC26XXRingBuffer[CC1310_LAUNCHXL_UART0],
        .ringBufSize    = sizeof(uartCC26XXRingBuffer[CC1310_LAUNCHXL_UART0]),
        .txIntFifoThr   = UARTCC26XX_FIFO_THRESHOLD_1_8,
        .rxIntFifoThr   = UARTCC26XX_FIFO_THRESHOLD_1_8,
        /* .rxIntFifoThr   = UARTCC26XX_FIFO_THRESHOLD_7_8, */
        .errorFxn       = NULL
    }
};

Uart parameter configuration.

#if defined(BOARD_DISPLAY_USE_UART)
    /* Enable System_printf(..) UART output */
    UART_init();
    UART_Params_init(&uartParams);
#ifndef TIMAC_AGAMA_FPGA

    //uartParams.writeMode = UART_MODE_CALLBACK;
    uartParams.readMode = UART_MODE_CALLBACK;
    uartParams.readCallback = &uartRxCallBack;
    uartParams.writeDataMode = UART_DATA_TEXT;
    uartParams.readDataMode = UART_DATA_TEXT;
    uartParams.readReturnMode = UART_RETURN_NEWLINE;
    uartParams.readEcho = UART_ECHO_OFF;
    uartParams.baudRate = 115200;

#else
    uartParams.baudRate = 460800;
#endif

    UartPrintf_init(UART_open(Board_UART0, &uartParams));
    /*UART_control(hUart, UARTCC26XX_CMD_RETURN_PARTIAL_ENABLE, NULL);*/

#endif /* BOARD_DISPLAY_USE_UART */

This is uartRxCallBack function in which i am receiving byte by byte data and storing it in "buff"  array.

Shared the uartsRxCallBack snippet below.

void uartRxCallBack(UART_Handle handle, void *Rx_char, size_t size)
{
    /* buff is a global char array of 64 bytes */

    buff[idx] = *(uint8_t*) Rx_char;
    if (buff[idx] == '\r')
    {
        MsgObj msg;
        msg.id = 0x19;

        /* String Terminating */
        buff[idx] = '\0';

        /* Passing address of string */
        msg.val = buff;
        idx = 0;

        /* memset(buff, 0x00, sizeof(buff)); */

        Mailbox_post(mbxHandle, &msg, BIOS_NO_WAIT);
    }
    else
    {
        idx++;
    }
    UART_read(handle, &Rx_char, 1);
}

Void MailTaskFxn(UArg a0, UArg a1)
{

    Mailbox_Params_init (&mbxParams);
    mbxParams.buf = &mailboxBuffer;
    mbxParams.bufSize = sizeof(mailboxBuffer);
    Mailbox_construct(&mbxStruct, sizeof(MsgObj), NUMMSGS, &mbxParams, NULL);
    mbxHandle = Mailbox_handle(&mbxStruct);

    MsgObj payload;
    uint8_t *ptr = NULL;

    while (true)
    {
        if(Mailbox_pend(mbxHandle, &payload, BIOS_WAIT_FOREVER))
        {
            /* System_printf("payload received: 0x%02x\r\n", payload.id); */
            ptr = payload.val;

            /* LCD_WRITE_STRING((char *)payload.val,10); */

            UART_write(hUart,ptr,strlen((char*)ptr));

            /* To display properly on terminal*/
            UART_write(hUart,"\n",1);

            System_flush();
        }
    }
}

So, I have created a task for Mail_box as shown in above code snippet and i am printing the received bytes from here by using "UART_write" which i have received in  "buff" array .

And the very same logic i tried with "uartecho" example of the sdk and it was working fine.