ATmega328 USART via AVR Studio

Development Boards MicroMod
1

Hi Guys,

I’m really stuck, after working on the tutorial shown on the sparkfun website on hooking the ATmega8/168/328 to RS232 i’ve gotten it to the point where if i loop the MAX232 it works great. i can get the LED to light up as per the initial programming tutorial. i have hooked the ATmega328 to the MAX232 and followed the code examples in the 328 Datasheet.

BUT it will not send data to the hyperterminal.

here is my code.

#include <avr/io.h>

void USART_Init() {
             // BAUD 2400, No Parity, 1 Stop Bit, Asyncronous
	UCSR0A = 0x00;
	UCSR0B = 0x18;
	UCSR0C = 0x86;
	UBRR0H = 0x00;
	UBRR0L = 0x33;
}


void USART_Transmit( unsigned char data ) {

	// Wait for empty transmit buffer */
	while ( !( UCSR0A & UDRE0) );
	// Put data into buffer, sends the data */
	UDR0 = data;
}

int main() {
// status LED
DDRC = 255;
PORTC = 255;

USART_Init();

USART_Transmit('h');
USART_Transmit('e');
USART_Transmit('l');
USART_Transmit('l');
USART_Transmit('o');

return 0;
}

any help would be awesome!!!

oh and on occasion when i try to save/build the project is get the following error

"Encountered a Sharing Violation while accessing

C:\Users\Matt\Documents\AVR Projects\Serial328\MFC31C1.tmp."

im using windows 7.

however i can still retry the save/build and it works fine.

oh and yes. hyperterminal is setup for the BAUD rate etc etc.

Cheers,

Matt

2

ok poeple… solved it.

my BAUD rate was not correct as the ATmega328’s default clock frequency is 1MHz and not 8MHz.