Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

[AVR] Make String Interrupt

Status
Not open for further replies.
D

#define ME

Newbie level 2
Joined
Jun 20, 2014
Messages
2
Helped
0
Reputation
0
Reaction score
0
Trophy points
1
Activity points
15
Hi everyone, can somebody show me or guide me how to receive and transmit a complete string using interrupt, after this I using polling. My code is like this --->:arrow:

Code: 
#include <avr/io.h>

void serial_init(void)
{
    UBRRH = 0x00;
    UBRRL = 95;   //baudrate 9600 and F_CPU 14745600UL
    UCSRB =  (1 << RXEN) | (1 << TXEN) | (1<<RXCIE); 
    UCSRC = (1<<URSEL)|(1<<USBS)|(3<<UCSZ0)|(1 << UCSZ1);
}

unsigned long long Usart_Receive(void)          
{
    while((UCSRA & (1 << RXC)) == 0) {};
    return UDR;
}
void USART_Transmit(unsigned long c)   
{
    PORTD= 0b00000100;  //RTS Enable
    while ((UCSRA & (1 << UDRE)) ==0) {};
    UDR = c;
    PORTD= 0b00000000;  //RTS Disable
}

int main(void)
{
    unsigned char data;
    serial_init();
    while (1)
    {
        data = Usart_Receive();
        _delay_ms(100);
        USART_Transmit(data);
    }
    return 0;   
}

But it does not came out the whole string, it only take 4 letter. e.g. I wrote ABCDEF it come out ABCF ,:-? that why I want to use interrupt. Can someone show me the code or guide me about this. I am using avr studio 5 and bray terminal like this one. avr freak1.jpg


Thank for the help :grin:
 

Put your receive code inside
Code: 
ISR USART_RC_Vect()  {

}

and enable Serial and global interrupts before while(1).
 

thank for this guide, but I already know what interrupt opening but what's in the middle that I did not know what to put to make sure that it receive a complete string.

Code: 
void serial_init(void)
{
	UBRRH = 0x00;
	UBRRL = 95;
	UCSRB =  (1 << RXEN) | (1 << TXEN) | [B][I](1<<RXCIE)[/I][/B]; 
	UCSRC = (1<<URSEL)|(1<<USBS)|(3<<UCSZ0)|(1 << UCSZ1); 
	
}

ISR (USART_RXC_vect)
{ 
//I dont know what to put

}

before this I already try this interrupt
Code: 
ISR(USART_RXC_vect) 
{ 
   char ReceivedByte; 
   ReceivedByte = UDR; // Fetch the received byte value into the variable "ByteReceived" 
   UDR = ReceivedByte; // Echo back the received byte back to the computer 
}

but it only sent and receive a character. How to modified this code to enable it to send a string. :smile:
Thank.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top