serial.c

AVR系列被广泛应用的单片机MEGA8开发(原理图)及例程

#include "defines.h"
void SerialInit(void)
{
#ifdef _ATMEGA32
    UBRRL = 11;                         // 19200bps @ 3.69 MHz
    UCSRB = (1<<RXEN) | (1<<TXEN);      // Enable recieve and transmit UART1
#endif

#ifdef _ATMEGA161
 UCSR0B = 0x00; //disable while setting baud rate
 UCSR0A = 0x00; //disable while setting baud rate
 UBRR0  = 0x0B; //set baud rate
 UBRRHI = 0x00;
 UCSR0A = 0x00; //enable
 UCSR0B = 0x18; //enable#endif
#endif
#ifdef _ATMEGA163
    UBRRL = 11;                          // 19200bps @ 3.69 MHz
    UCSRB = (1<<RXEN) | (1<<TXEN);        // Enable recieve and transmit
#endif
#ifdef _ATMEGA8
UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = 0x86;
 UBRRL = 0x0B; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 UCSRB = 0xF8;
#endif

}
void sendchar(char c)
{
#ifdef _ATMEGA32
   UDR=c;
   while (!(UCSRA & (1<<TXC)));                      //wait until byte sendt
   UCSRA |= (1<<TXC);                             //delete TXCflag
#endif
#ifdef _ATMEGA161
   UDR0=c;
   while (!(UCSR0A & (1<<TXC0)));                      //wait until byte sendt
   UCSR0A |= (1<<TXC0);                             //delete TXCflag
#endif
#ifdef _ATMEGA163
   UDR=c;
   while (!(UCSRA & (1<<TXC)));                      //wait until byte sendt
   UCSRA |= (1<<TXC);                             //delete TXCflag
   
#endif
#ifdef _ATMEGA8
   UDR=c;
   while (!(UCSRA & (1<<TXC)));                      //wait until byte sendt
   UCSRA |= (1<<TXC);                             //delete TXCflag
   
#endif

}
void sendstr(char *s)
{while(*s)
{
sendchar(*s);
s++;
}
sendchar(0x0a);
//sendchar(0x0d);
}

char recchar(void)

{
unsigned char temp;
#ifdef _ATMEGA32
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif
#ifdef _ATMEGA161
   while(!(UCSR0A & (1<<RXC0)));    // Wait for data to come   
   temp=UDR0;
   return temp;
#endif
#ifdef _ATMEGA163
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif

#ifdef _ATMEGA8
   while(!(UCSRA & (1<<RXC))) ;
   temp=UDR;
   return temp;
#endif
}
char reccharcommand(void)
{unsigned int i;
unsigned char temp;
i=0;
#ifdef _ATMEGA32
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif
#ifdef _ATMEGA161
   while(!(UCSR0A & (1<<RXC0)));    // Wait for data to come   
   temp=UDR0;
   return temp;
#endif
#ifdef _ATMEGA163
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif

#ifdef _ATMEGA8
   while(!(UCSRA & (1<<RXC)))
   	{i++;
      if(i>6000)
      	return 0x00;};    // Wait for data to come   
   temp=UDR;
   return temp;
#endif
}

char reccharcommand2(void)
{unsigned int i;
unsigned char temp;
i=0;
#ifdef _ATMEGA32
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif
#ifdef _ATMEGA161
   while(!(UCSR0A & (1<<RXC0)));    // Wait for data to come   
   temp=UDR0;
   return temp;
#endif
#ifdef _ATMEGA163
   while(!(UCSRA & (1<<RXC)));                       // Wait for data to come
   return UDR;
#endif

#ifdef _ATMEGA8
   while(!(UCSRA & (1<<RXC)))
   	{i++;
      if(i>50000)
      	return 0x00;};    // Wait for data to come   
   temp=UDR;
   return temp;
#endif
}

/*
void sendint(unsigned int intdata)
{
unsigned char  i,tempdata,tempdata1,tempdata2,tempdata3,tempdata4,tempdata5;
unsigned char  firstzero=0;

for(i=0;i<5;i++)
  	  {
  		tempdata=intdata%10;
  		intdata=intdata/10;
  		switch(i)
  			{
  			case 0:  
  			            tempdata1=tempdata;
  			             break;
  			  case 1:
  			      	     tempdata2=tempdata;
  			             break;
  			   case 2:
  	  			    tempdata3=tempdata;
  			             break;
  			   case 3:
  	  			     tempdata4=tempdata;
  			             break;
  			     case 4:
  	  			      tempdata5=tempdata;
  			             break;        
  			    default:
  			             break;
  			             
  			}

  	  }
if(tempdata5!=0)
{
sendchar(tempdata5+48);
firstzero=1;
}
if((tempdata4!=0)||firstzero)
{
sendchar(tempdata4+48);

firstzero=1;
}
if((tempdata3!=0)||firstzero)
{
sendchar(tempdata3+48);

firstzero=1;

}
if((tempdata2!=0)||firstzero)
{
sendchar(tempdata2+48);

}
	
sendchar(tempdata1+48);
sendchar(0x0a);
sendchar(0x0d); 
}
*/