RTOS / CC2650：CC2650 uart 1byte callback

Hi Shouehi,

A basic example of this is available in the UART API documentation (or inside the UARTCC26XX.h header file).

#define MAX_NUM_RX_BYTES    1000   // Maximum RX bytes to receive in one go
uint32_t wantedRxBytes;            // Number of bytes received so far
uint8_t rxBuf[MAX_NUM_RX_BYTES];   // Receive buffer

// Callback function
static void readCallback(UART_Handle handle, void *rxBuf, size_t size)
{
    // Process data
}

static void taskFxn(UArg a0, UArg a1)
{
    UART_Handle handle;
    UART_Params params;
    // Init UART and specify non-default parameters
    UART_Params_init(&params);
    params.baudRate      = 9600;
    params.writeDataMode = UART_DATA_BINARY;
    params.readMode      = UART_MODE_CALLBACK;
    params.readDataMode  = UART_DATA_BINARY;
    params.readCallback  = readCallback;
    // Open the UART and initiate the first read
    handle = UART_open(Board_UART, &params);
    wantedRxBytes = 1;
    int rxBytes = UART_read(handle, rxBuf, wantedRxBytes);
    while(true); // Wait forever
}