Rainbow-electronics ATmega3290P_V Manuel d'utilisateur télécharger pdf (Page 167)

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ATmega329/3290/649/6490

2552H–AVR–11/06

Note: 1. See “About Code Examples” on page 8.

More advanced initialization routines can be made that include frame format as parame-

ters, disable interrupts and so on. However, many applications use a fixed setting of the

baud and control registers, and for these types of applications the initialization code can

be placed directly in the main routine, or be combined with initialization code for other

I/O modules.

Assembly Code Example

(1)

USART_Init:

; Set baud rate

out UBRR0H, r17

out UBRR0L, r16

; Enable receiver and transmitter

ldi r16, (1<<RXEN0)|(1<<TXEN0)

out UCSR0B,r16

; Set frame format: 8data, 2stop bit

ldi r16, (1<<USBS0)|(3<<UCSZ00)

out UCSR0C,r16

ret

C Code Example

(1)

#define FOSC 1843200 // Clock Speed

#define BAUD 9600

#define MYUBRR FOSC/16/BAUD-1

void main( void )

{

...

USART_Init(MYUBRR)

...

}

void USART_Init( unsigned int ubrr)

{

/* Set baud rate */

UBRR0H = (unsigned char)(ubrr>>8);

UBRR0L = (unsigned char)ubrr;

/* Enable receiver and transmitter */

UCSR0B = (1<<RXEN0)|(1<<TXEN0);

/* Set frame format: 8data, 2stop bit */

UCSR0C = (1<<USBS0)|(3<<UCSZ00);

}

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