uart.c

很好的串口调试程序

//ICC-AVR application builder : 2005-5-1 15:44:13
// Target : M16
// Crystal: 6.0000Mhz

#include <iom16v.h>
#include <macros.h>

#define b19200  ox19
#define b9600   0x26
#define baud   b9600

unsigned char com_in_buf[1];

void port_init(void)
{
 PORTA = 0xFF;
 DDRA  = 0xFF;
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//UART0 initialize
// desired baud rate: 9600
// actual: baud rate:9615 (0.2%)
// char size: 8 bit
// parity: Disabled
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = BIT(URSEL) | 0x06;
 UBRRL = baud; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 UCSRB = 0x98;
}

void send_data(unsigned char back)
{
  while( !( UCSRA & (1<<UDRE)) ) ;
  UDR=back;
}

#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
 //uart has received a character in UDR
 com_in_buf[0]=UDR;
 PORTA =~com_in_buf[0];
 send_data(com_in_buf[0]);
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();
 uart0_init();

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

void main(void)
{
  char j;
  init_devices();
  while(1)
  {
    for(j=1;j<100;j++)
	 ;
  }
}