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#define MYSERIAL Serial1
#define MAX_CMD_SIZE 96
#define BUFSIZE 4
#define LCD_MESSAGEGCODE(x) lcd_setstatusgcode(PSTR(x))

static long gcode_N, gcode_LastN, Stopped_gcode_LastN = 0;
static char *strchr_pointer;
static char serial_char;
static char cmdbuffer[BUFSIZE][MAX_CMD_SIZE];

static int bufindr = 0;
static int bufindw = 0;
static int buflen = 0;

static int serial_count = 0;
static boolean comment_mode = false;


void setup() {
  // put your setup code here, to run once:
 MYSERIAL.begin(19200);
}

void loop() {
  // put your main code here, to run repeatedly:
get_command();
}


void get_command(){
while( MYSERIAL.available() > 0  && buflen < BUFSIZE) {
    serial_char = MYSERIAL.read();
    if(serial_char == '\n' ||
       serial_char == '\r' ||
       serial_char == ':')
    {
      if(!serial_count) { //if empty line
        comment_mode = false; //for new command
        return;
      }
      cmdbuffer[bufindw][serial_count] = 0; //terminate string
      if(!comment_mode){
        comment_mode = false; //for new command

        if(strchr(cmdbuffer[bufindw], 'N') != NULL)
        {
          strchr_pointer = strchr(cmdbuffer[bufindw], 'N');
          gcode_N = (strtol(&cmdbuffer[bufindw][strchr_pointer - cmdbuffer[bufindw] + 1], NULL, 10));
           LCD_MESSAGEGCODE(gcode_N)
        }

      }
    }
    
    
    }
    
    
    
    }


 void lcd_setstatusgcode(long int*message)
{

}

Merci