sketch_mkBER.ino

#include<TimerOne.h>

#define INPUT_PIN 7
#define LED_PIN 13
#define MAX 500

volatile int i = 0;
volatile int temp[MAX+25];
volatile int mk[127];

void ber()
{
  temp[i++] = digitalRead(INPUT_PIN);
}

void setup()
{
  pinMode(INPUT_PIN,INPUT);
  pinMode(LED_PIN,OUTPUT);
  
  Serial.begin(115200);
  
  int x,y,input = 0,BitError = 0;
  
  //M系列生成
  mk[0] = 1;
  mk[1] = 1;
  mk[2] = 1;
  mk[3] = 1;
  mk[4] = 1;
  mk[5] = 1;
  mk[6] = 1;
  for(int b = 7;b < 127;b++)
 {
    mk[b] = mk[b-7]^mk[b-1];
 } 

  digitalWrite(LED_PIN,HIGH); //スタート

  Timer1.initialize(25);  //クロック(25us)
  
  Timer1.attachInterrupt(ber); //割り込み
  
  while(1) //割り込み終了
  {
    if(i >= MAX-1)
    {
      Timer1.detachInterrupt();
      break;
    }
  }
 
 digitalWrite(LED_PIN,LOW); //エンド
 
 //頭出し
 for(int a = 0;a < MAX;a++)
 {
   if(temp[a] == 1 && temp[a+1] == 1 && temp[a+2] == 1 && temp[a+3] == 1 && temp[a+4] == 1 && temp[a+5] == 1 && temp[a+6] == 1) 
   {
     x = a;
     break;
   }
 }
 
int b = 0;
 for(int a = x;a < MAX;a++)
 {
   Serial.print(a-x);
   Serial.print(":::");
   
   if(b == 127)
   {
     if(0 == temp[a]){input++;}
     else{input++; BitError++;}
     Serial.print("000"); //デバック用
     b = 0;
   }
   else
   {
     if(mk[b] == temp[a]){input++;}
     else {input++; BitError++;}
     Serial.print(mk[b]);
     b++;
   }
   
   Serial.print(":::");
   Serial.println(temp[a]);
 }
 Serial.print(" InputBit -> ");
 Serial.print(input);
 Serial.print(" BitError -> ");
 Serial.print(BitError);
 Serial.print(" BER -> ");
 Serial.println(100*BitError/input);

}

void loop()
{
 
}