How to detect serial break

Projects Programming
1

I am planning to use teensy uart for LIN recepition but I have not seen any good examples how to detect 13 bit long serial break. Should I use uart and wait until 0x00 is received or should I use pinmode and count bit low times with delays?

Regards,

Jaanus

2

You might be interested in: GitHub - gandrewstone/LIN: The LIN protocol implemented over Arduino APIs (Serial and Digital IO)

3

Hi James!

Do you know how the code in the link works? There are some parts of the code that i don't understand and could really use some help!

4

I tried a few thing and found that this worked out alright for me to detect a serial break on the hardware serial

#include <TimerOne.h>

volatile unsigned long tmr1,baud1;
volatile uint8_t n;

void timeout_1(){
  Timer1.StopTimer();
  if(digitalRead(0)==HIGH){
    Serial.begin(baud1);
    Serial.println("Data Byte"+String(n));    
  }
  else{
    Serial.begin(baud1);
    Serial.println("Serial Break"+String(n)); 
  }
}

void setup() {

  baud1=9600;

  pinMode(0,INPUT);
  
  Serial.begin(baud1);
  tmr1 = 500000/baud1; //timer1 period in microseconds

  Serial.println("READY!");
}

void loop() {
  if(Serial.available()) {
    n  = Serial.read();
    Serial.end();
    Timer1.EnableTimerInterrupt(timeout_1,tmr1); //set timer interrupt(period=1/(2*Baud)). Call 'timeout_1' on interrupt
  }
}