c programing logic for reading sensor over UART

i'm trying read data sensor connected mcu on uart. when powered sensor outputs continuously ascii capital "r", followed 4 ascii character digits representing distance in millimeters, followed carriage return (ascii 13). e.g. r9999cr

for uart there 2 read functions blocking 1 , non-blocking:

blocking

code: [select]


/**
 * uart character data read.
 *
 * perform single character read uart interface.
 * blocking synchronous call.
 *
 * @param[in] uart uart index.
 * @param[out] data data read uart. must not null.
 * @param[out] status uart specific status.
 *
 * @return standard errno return type qmsi.
 * @retval 0 on success.
 * @retval negative @ref errno possible error codes.
 */
int uart_read(const uart_t uart, uint8_t *const data,
         uart_status_t *const status);

non_blocking

code: [select]

/**
 * uart character data read.
 *
 * perform single character read uart interface.
 * non-blocking synchronous call.
 *
 * @param[in] uart uart index.
 * @param[out] data character read. must not null.
 *
 * @return standard errno return type qmsi.
 * @retval 0 on success.
 * @retval negative @ref errno possible error codes.
 */
int uart_read_non_block(const uart_t uart, uint8_t *const data);

i wondering if me figure out logic reading e.g. 9999 variable called reading.

should use blocking or non blocking function , how isolate characters if data streaming in?

code: [select]


if (serial.available()>4){
  if (serial.read() == 'r'){
  char0 = serial.read();
  char1 = serial.read();
  char2 = serial.read();
  char3 = serial.read();
  }
}

put 4 variables want.

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