uart.c

来自「AVR系列被广泛应用的单片机MEGA8开发(原理图)及例程」· C语言 代码 · 共 140 行

#include <iom8v.h>
#include <macros.h>
#include "Uart.h"

void uart0_RX_Enable(void)
{
UCSRB = 0xE8; //disable while setting baud rate
}
void uart0_RX_Disable(void)
{
UCSRB = 0xF8; //disable while setting baud rate
}

void uart0_init(void)
{
 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; 
 }
#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{ unsigned char tempdata;
   tempdata = UDR; /* read the received data */
   PutChar( tempdata);
 //  PutChar(0x0a);
 //  PutChar(0x0d);
  PutStr("富友勤 ATMEGA8 DEMO");
 PutStr("Start IAP");

   if(tempdata=='I')
   	{ CLI(); 
   	  UCSRB = 0x00; 
          asm("JMP 0x1C00") ;
   	}
	}

#pragma interrupt_handler uart0_udre_isr:13
void uart0_udre_isr(void)
{
 //character transferred to shift register so UDR is now empty
 
}

#pragma interrupt_handler uart0_tx_isr:14
void uart0_tx_isr(void)
{
}


int PutStr(char *s)
{
while(*s)
{while ( !(UCSRA & (1<<UDRE)) )
		; /* wait for empty transmit buffer */
UDR = *s; /* start transmittion */

s++;
}


while ( !(UCSRA & (1<<UDRE)) )
		; /* wait for empty transmit buffer */
UDR = 0x0a; /* start transmittion */
//while ( !(UCSRA & (1<<UDRE)) )
		; /* wait for empty transmit buffer */
//UDR = 0x0d; /* start transmittion */
return 1;
}
void PutInt(unsigned int intdata)
{
unsigned char  i,tempdata,tempdata1,tempdata2,tempdata3,tempdata4,tempdata5;
unsigned char  firstzero=false;

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)
{
PutChar(tempdata5+48);
firstzero=true;
}
if((tempdata4!=0)||firstzero)
{
PutChar(tempdata4+48);

firstzero=true;
}
if((tempdata3!=0)||firstzero)
{
PutChar(tempdata3+48);

firstzero=true;

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

}
	
PutChar(tempdata1+48);
PutChar(0x0a);
//PutChar(0x0d); 
}
void PutChar(unsigned char c)
{
while ( !(UCSRA & (1<<UDRE)) )
		; 
UDR = c;
}