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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Radio Button Group with 2 rows"

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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <com.custom.view.ToggleButtonGroupTableLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/radgp_order"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

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/**
 * 
 */
package com.custom.view;

import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;

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void setup() {
  // put your setup code here, to run once:
}

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

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/*
  Rework original sample with AVR-libc.
 */

#include <avr/io.h>
#include <util/delay.h>
// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  DDRB |= _BV(5);    // pinMode(13, OUTPUT);  

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#include <avr/io.h>

PORTC |= (_BV(0) | _BV(1) | _BV(2));    // Set bits 0, 1, 2

PORTC &= ~(_BV(3) | _BV(4) | _BV(5));   // Clear bits 3, 4, 5

PORTC ^= (_BV(6) | _BV(7));             // Toggle bits 6, 7


//without using MACRO _BV() would looks like this

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#include <avr/io.h>

PORC |= _BV(0);   //PORTC |= (1 << 0);   // Set bit 0 only
 
PORCT &= ~_BV(1); //PORTC &= ~(1 << 1);  // Clear bit 1 only
 
PORTC ^= _BV(4);  //PORTC ^= (1 << 4);   // Toggle bit 4 only.
 
PORTC |= _BV(7);  //PORTC |= (1 << 7);   // Set bit 7 only.

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#define _BV(x) (1 << x)

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PORTC |= (1 << 0);   // Set bit 0 only

PORTC &= ~(1 << 1);  // Clear bit 1 only

PORTC ^= (1 << 4);   // Toggle bit 4 only.

PORTC |= (1 << 7);   // Set bit 7 only.

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/*
  Rework original sample with AVR-GCC.
 */

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin 13 as an output.
  DDRB |= (1 << 5);    // pinMode(13, OUTPUT);  
}