001._c

avr单片机的串口通讯程序

//ICC-AVR application builder : 2005-9-7 11:07:15
// Target : M32
// Crystal: 7.3728Mhz

#include <iom32v.h>
#include <macros.h>

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0xFF;
 
 PORTB = 0x00;
 DDRB  = 0xFF;
 
 PORTC = 0x00; 
 DDRC  = 0xFF;
 
 PORTD = 0x00;
 DDRD  = 0xFF;
}

//Watchdog initialize
// prescale: 16K 
void watchdog_init(void)
{
 WDR(); //this prevents a timout on enabling
 //WDTCR = 0x08; //WATCHDOG ENABLED - dont forget to issue WDRs

/* Write logical one to WDTOE and WDE */
WDTCR |= (1<<WDTOE) | (1<<WDE);
/* Turn off WDT */
WDTCR = 0x00;
}

//UART0 initialize
// desired baud rate: 9600
// actual: baud rate:9600 (0.0%)
// char size: 8 bit
// parity: Disabled
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = BIT(URSEL) | 0x06;
 UBRRL = 0x2F; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 UCSRB = 0x18;
}
void Delay1ms(void)
{	 
unsigned int  i;

for(i=0;i<=(unsigned int)(7.3828*143-2);i++);
}

void Delayxms(unsigned char ms)
{	
unsigned char i;

for(i=0;i<=ms;i++)Delay1ms();

}

//call this routine to initialize all peripherals
void main(void)
{
 //stop errant interrupts until set up
 unsigned char i;
 CLI(); //disable all interrupts
 port_init();
 //watchdog_init();
 uart0_init();
//Latch_H;
		//Latch_L;
		
		
		
 
 
 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 //SEI(); //re-enable interrupts
 //all peripherals are now initialized
 
 asm("sbi 0x12,3");
 asm("cbi 0x12,3"); 
 i=0;
 
 //for(i=0;i<10;i++)
 do{
 //UDR=0X55;
//while((UCSRA&0X40));
 //UCSRA&=0b10111111;
 
 
 
 PORTA=i;
 
 asm("sbi 0x12,3");
 asm("cbi 0x12,3");
 Delayxms(1000);
 i++;
 }while(1);
 
 
 
 
 
 
 //while(1);
 
}