Arduino Timer Question

Hi guys I am using two rf devices to transmit data, the transmitter is attiny85 and receiver is atmega328p, but now I am trying to execute another code while the receiver is reading data when I do it I get request time out in my c# application.
I am using MANCHESTER library to transmit the number data :slight_smile:
Is there a way to use delegate or something to interupt the manchester 1 minute delay and execute the code for turning on my TV ?


#include <MANCHESTER.h>

#define RxPin 4

void setup() 
 MANCHESTER.SetRxPin(RxPin); //user sets rx pin default 4
 MANCHESTER.SetTimeOut(1000); //user sets timeout default blocks
 Serial.begin(9600);	// Debugging only
}//end of setup

void loop() 
 unsigned int data = MANCHESTER.Receive();
}//end of loop

After Serial.println(data);

char c =;
if(c == 'p')
//this method just send a special IR impulse in order to control the mp3 player at home

Not familiar with the manchester library, can you post a link?

Not familiar with the manchester library, can you post a link?

Manchester.cpp - - –§–į–Ļ–Ľ –ĺ—Ä–≥–į–Ĺ–ł–∑–į—ā–ĺ—Ä

I wrote a Manchester library (not the one you posted) which uses pin change interrupts and thus keeps going while you do other things.

It is described here:

The library is on that page, a fairly small download, plus example code in the car receiver.

Scroll down to: "Manchester receiving library".

Ok I found receiver and send library and I downloaded them both but I have one question is it possibble to upload the transmiter sketch to attiny85 with arduino UNO AS ISP and then upload the receiver to my arduino uno ?
I presume that ManchesterSend is the same as ManchesterTransmiter

I presume it is the same protocol. The send library uses Timer 2, you may have to rework it slightly for the Attiny.

so as far as I know from assembler the attiny85 dont have timer2 and I have to use Timer1 , and in order tgo sync it with the atmega328p receive programm I have to use attiny internal 8MHz.
I changed the code this way :

//  ManchesterSend.cpp
//  Created by Nick Gammon on 22/01/12.
//  Copyright 2012 __MyCompanyName__. All rights reserved.

#include <ManchesterSend.h>

namespace ManchesterSend {
  // which pin to send on
  byte sendPin;

  // current bits yet to be sent
  volatile unsigned long outData;
  // how many bits
  volatile byte bitsToGo;
  // the current bit
  byte currentBit;
  // have we sent the first of the two pulses?
  boolean sentFirst;

// initialize by setting send pin to output
//   also configure Timer 2 to interrupt us every 500 uS
void begin (const byte pin)
  sendPin = pin;
  digitalWrite (sendPin, HIGH);
  pinMode (sendPin, OUTPUT);
  bitsToGo = 0;
  // reset Timer 2
  TCCR1A = 0;
  TCCR1B = 0;
  // Timer 2 - gives us our 500 uS counting interval
  // 16 MHz clock (62.5 nS per tick) - prescaled by 64
  //  counter increments every 4 uS. 
  // So we count 125 of them, giving exactly 500 uS (1 mS)
  TCCR1A = _BV (WGM21) ;   // CTC mode
  OCR1A  = 124;            // count up to 125  (zero relative!!!!)
  // Timer 2 - interrupt on match 
  TIMSK1 = _BV (OCIE1A);   // enable Timer2 Interrupt
  TCNT1 = 0;     
  // Reset prescalers
  GTCCR = _BV (PSRASY);        // reset prescaler now
  // start Timer 2
  TCCR1B =   _BV (CS22) ;  // prescaler of 64

} // end of ManchesterSend::begin

// write one byte (blocking)
void write (const byte data)
  outData = (((unsigned long) data) << SYNC_BITS) | (1UL << (SYNC_BITS - 1));  
  bitsToGo = SYNC_BITS + 8;
  // wait for data to go                            
  while (bitsToGo)
    {}  // block until ISR pulls bits out

  delay (1);  // give last pulse time to go in case it was a LOW
  } // end of ManchesterSend::write

// Timer 2 interrupt here:
// a 1 is 01
// a 0 is 10

void isr ()
  // if out of bits, set line to high and exit  
  if (bitsToGo == 0)
    digitalWrite (sendPin, HIGH);
    }  // end of nothing to do
  // second pulse is the right way around
  if (sentFirst)
    if (currentBit == 0)
      digitalWrite (sendPin, LOW);        
      digitalWrite (sendPin, HIGH);      
    // read for next one
    sentFirst = false;
    // one less bit
    bitsToGo--;  // that bit has been sent
    }  // end of done second bit
  // get low-order bit
  currentBit = outData & 1;
  // ready for next time
  outData = outData >> 1;
  // send inverse of bit
  if (currentBit == 0)
    digitalWrite (sendPin, HIGH);        
    digitalWrite (sendPin, LOW);  
  // next time we sent other way around
  sentFirst = true;    
  } // end of ManchesterSend::isr

} // end namespace ManchesterSend

// Timer 2 compare: call our ISR
  ManchesterSend::isr ();
}  // end of TIMER2_COMPA_vect

Please tell me if I changed correct the code to work with Timer1, the code compile for atmega328 :slight_smile:
but when I try for attiny85 I get:

C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp: In function 'void ManchesterSend::begin(byte)':
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:42: error: 'TCCR1A' was not declared in this scope
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:43: error: 'TCCR1B' was not declared in this scope
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:50: error: 'WGM21' was not declared in this scope
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:54: error: 'TIMSK1' was not declared in this scope
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:58: error: 'PSRASY' was not declared in this scope
C:\Users\XaKeRa\Desktop\arduino-0023\libraries\ManchesterSend\ManchesterSend.cpp:60: error: 'CS22' was not declared in this scope