UART communication protocol read with Arduino

void ProcessSerialData(){
  uint8_t mData = 0;
  uint8_t i = 0;
  uint8_t mPkt[10] = {0};
  uint8_t mCheck = 0;
  while (Serial.available() > 0){    
    // packet format: AA   C0   PM25_Low   PM25_High   PM10_Low   PM10_High   0   0   CRC   AB
    mData = Serial.read();     
    delay(2);                                   // wait until packet is received
       if (mData == 0xAA){               // head1 ok
       mPkt[0] =  mData;
           mData = Serial.read();
           if (mData == 0xc0){           // head2 ok
           mPkt[1] =  mData;
    mCheck = 0;
       for (i = 0; i < 6; i++){           // data recv and crc calc
       mPkt[i + 2] = Serial.read();
       delay(2);
       mCheck += mPkt[i + 2];
     }
        mPkt[8] = Serial.read();
        delay(1);
        mPkt[9] = Serial.read();
        if (mCheck == mPkt[8]){        // crc ok
          Serial2.flush();
          
        Pm25 = (uint16_t)mPkt[2] | (uint16_t)(mPkt[3] << 8);
        Pm10 = (uint16_t)mPkt[4] | (uint16_t)(mPkt[5] << 8);
        return;
        }
      }
    }
  }
}