Receive string through UART

In this tutorial I am going to show you how to receive a string through UART. In this program we are going to make use of the previous function which were written for receiving the character through UART. Don't forget to put NULL character at the end of the string..... #include<avr/io.h> void UART1_Init() { //set baud rate = 9600 bps UBRR1H = 0x00; UBRR1L = 103;         //0x67 //set 1 stop bit, no parity bit and 8 bit charachter size UCSR1C = 0x06;         //(1 << UCSZ1)|(1 << UCSZ0)   //enable transmission and reception UCSR1B = 0x18;         //(1 << RXEN)|(1 << TXEN) } //Transmit character through UART void UART1_Tx_Char(unsigned char data){ //put the data to be transmitted...

Read more »

Receive Character Through UART

In this tutorial we are going to receive a single character through UART and display that character over PORTC, to which we can connect the LEDs. (these codes have been written for ATmega128 micro-controller which has two UART circuitry, UART0 & UART1, the same code can be used with other AVR micro-controllers with some minor changes) #include < avr/io.h > //Initialize UART circuitry void UART1_Init() { //set the baud rate as 9600 bits per second UBRR1H = 0x00; UBRR1L = 0x67; //or 103 in decimal //set character size as 8-bit, no parity bit, one stop bit UCSR1C = 0x06 // (1 << UCSZ1)|(1 << UCSZ0); //enable reception and transmission UCSR1B = 0x18 // (1 << RXEN)|(1 << TXEN); } void main(){ //define PORTC as an output port to display received...

Read more »

Transmit Character Through UART

In this tutorial I am going to show you how to transmit a character through UART. First of all we have to initialize the UART circuitry of our micro-controller by providing proper values to the UART registers in AVR. There are basically 5 registers for UART.... (these codes have been written for ATmega128 micro-controller which has two UART circuitry, UART0 & UART1, the same code can be used with other AVR micro-controllers with some minor changes) ********************************************************************************* Transmit a Character Through UART ********************************************************************************* //Include AVR Header file  #include < avr/io.h >   //Initialize UART circuitry void UART1_Init() {     ...

Read more »

Transmit String Through UART

In this tutorial i am going to show you how to transmit a string through UART. For that you first have to initialize the UART circuitry in your micro-controller. For initializing we have to update UART registers in AVR. There are basically 5 registers for UART in AVR.... 1. UBRR register for setting up the baud rate for the transmission. Its a 16 bit value and the AVR is an 8 bit micro-controller, so this 16 bit value is stored in two 8 bit registers (UBRRnL and UBRRnH) 2 And 3 control registers (UCSRnA, UCSRnB and UCSRnC). 3. ATmega 128 is having 2 UART ciruitry (UART0 and UART1) and for each circuitry we are having different registers, for ex: UBRR1L for UART1 and UBRR0L for UART0. (these codes have been written for ATmega128 micro-controller which has two UART circuitry, UART0...

Read more »

Generating LED Patterns

In this tutorial i am going to show you, how to generate some pattern using LEDs. The micro controller is ATmega128 and the 8 LEDs are connected to the PORTC of the micro controller. The code is written in such a way that first the LEDs will be glowing  in Right-to-Left fashion and then from Left-to-Right fashion and will continue for ever. ********************************************************************************* Generating LED Pattern ********************************************************************************* //Include AVR Header file  #include < avr/io.h >   //Include DELAY Header file #include < util/delay.h > //Start main function void main() {         int i = 0;      //Set...

Read more »

Blinking LEDs

In this tutorial I am going to show you, how to blink LEDs using AVR micro controller. I am using ATmega128/ ATmega64 (both of the micro controller can be used interchangeably as they differ in the size of flash memory only). The 8 LEDs which I am going to blink/toggle are connected to PORTC of the micro  controller and they will toggle after 100 ms. So let's start with it............ ********************************************************************************* Blinking LEDs ********************************************************************************* //Include AVR Header file  #include"avr/io.h"   //Include DELAY Header file #include"util/delay.h"  //Start main function void main() {         //Set a particular...

Read more »