Info Linux and Microcontroller

Install package called build-essential is the best way

build-essential contains a list of packages which are essential for building Ubuntu packages including gcc compiler, make and other required tools.

$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo apt-get install build-essential
$ gcc -v
$ make -v
Now, you should able to compile software using C / C++ compilers.

If You Install More than 4 GB Memory in your 32bit ubuntu Machine It will not access the memory beyond 4GB.The x86 architecture presently uses only 36 bits out of 52 bits possible. On x86-64 processors, PAE is obligatory in native long mode; currently 40 bits are used out of 52 bits possible. How do I find out if my Linux kernel supports 36-bit or more physical addressing?

$ sudo grep physical /proc/cpuinfo

shows

physical id : 0
address sizes : 36 bits physical, 48 bits virtual .........


$ free -m will show only <>$ sudo apt-get update
$ sudo sudo apt-get install linux-headers-server linux-image-server linux-server
Once kernel images installed, just reboot your machine ,

$ sudo reboot
After reboot, login into your system and type the following command to verify memory usage:
$ free -m



The PIC18 family utilizes a 16-bit program word architecture and incorporates an advanced RISC architecture with 32 level-deep stack, 8x8 hardware multiplier, and multiple internal and external interrupts. With the highest performance in Microchip’s 8-bit family, the PIC18 family provides up to 16 MIPS and linear memory. PIC18 is the most popular architecture for new 8-bit designs where customers want to program in C. Choose from over 150 PIC18 products supporting both 3V and 5V applications with packages ranging from 18 to 100 pins. Integration is key on the PIC18 devices, with support for connectivity and human interface peripherals including: USB, Ethernet, touch sensing, LCD display drivers – all with free supporting software and application notes to help you get to market faster.

See a Video Tutorial about PIC 18 Family here http://www.youtube.com/watch?v=iC3BTlfFHM4

Most popular 2 x 16 LCD Display HD44780 chipset have a display memory up to 40 charactors.
]Only 16 can display on a line. See the program for display the screen to the left or right shift operation .


#include <16f877.h>
#fuses XT,NOWDT,PUT,NOPROTECT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#include "lcd.c"

void forword_dir(void)
{
lcd_send_byte(0, 0X18);
}

void backword_dir(void)
{
lcd_send_byte(0, 0X1E);
}
void main() {
int a,i;

lcd_init(); //lcd initialize
lcd_putc("\f"); //lcd clear
// lcd memory can hold up to 40 characters
lcd_putc(" http:// shibuvarkala . blogspot . com");

for(;;){
for(i = 0; i <>
{
backword_dir();
delay_ms(50); // scroll delay
}

for(i = 0; i <>
{
forword_dir();
delay_ms(50);
}
}
}

How to get safe and quick access to Linux file systems? DiskInternals Linux Reader is a new tool for do this. This program act as a bridge between MS Windows and Ext2/Ext3 Linux file systems. This easy-to-use tool runs under Windows and allows you to browse Ext2/Ext3 Linux file systems and extract files from there. Linux Reader is absolutely free. Download it Here

You can make encrypted text file with Password Using Famous Text Editor vi.

For Making an encrypted file , Use vi -x filename to edit a new file. Then vi will prompts you to set a password, after that it will encrypts the contents of the file. Whenever you access this file, vi will ask for the correct password.