Best way to read data from UART

Do you use Z-Stack? If yes, you just register a RX callback function and it would get called when there is data comes in.

Yes I use Z-Stack. Actually as I'm trying to understand the HAL Uart, there were some weird issues that happened.

I did an experiment, where in, I disabled MT. I used usb to serial chip that will send 10 bytes to uart backchannel of smartrf06 board.

I programmed the LCD to output the rx buffer len, # of times ISR callback function was called, & event.

here's what LCD showed me BEFORE sending 10 bytes: (16 made sense that event = HAL_UART_TX_EMPTY)

0

0

16

here's what LCD showed me AFTER sending single 10 bytes: (6 here should be 10 right??)

6

1

4

My uart initialization:

#define LEN_TOTAL_METER_BYTES 69

static void v_SetupUART1( void );

static void v_SetupUART1( void ) {
  halUARTCfg_t uartConfig;
  
  //Configure UART parameters
  uartConfig.configured = true;
  uartConfig.baudRate = HAL_UART_BR_19200;
  uartConfig.flowControl = HAL_UART_FLOW_OFF;
  uartConfig.flowControlThreshold = 0; //Set this to 0 for now
  uartConfig.rx.maxBufSize = LEN_TOTAL_METER_BYTES + 1;   //+1 to get the last byte correctly???
  uartConfig.tx.maxBufSize = 16;        //We don't need to transmit for now
  uartConfig.idleTimeout = 1;
  uartConfig.intEnable = true;
  uartConfig.callBackFunc = (halUARTCBack_t)v_uartCallback;
  
  //Open the port
  if (HalUARTOpen(HAL_UART_PORT_1, &uartConfig) == HAL_UART_SUCCESS) {
    HalLcdWriteString("Init OK", HAL_LCD_LINE_5);
  }

}

UART RX callback notifies you there is UART message comes in. There is no guarantee that 10 bytes would come in at one time. You have to use a buffer to collect incoming data and parse it.

So how do I do it if it doesn't guarantee the # of bytes I need?