getascii.c

开发环境为ICC。通过串口显示PC键盘的ASCII码的一个小程序。

//ICC-AVR application builder : 2006-3-8 15:48:09
// Target : M16
// Crystal: 8.0000Mhz

#include <iom16v.h>
#include <macros.h>
#define uchar unsigned char
#define uint unsigned int




void delay_1ms(void)//1ms延时函数
{
  unsigned int i;
  for (i=0;i<150;i++)
  {
  } 
}
void delay_nms(unsigned int n)//延时n毫秒
{
  unsigned int i;
  for (i=0;i<n;i++)//执行n次1毫秒延时
  delay_1ms(); 
}



void ASCIISend(unsigned int ascVal)
{
 	UDR=ascVal;
	while(!(UCSRA&0X40));
	UCSRA|=0x40;
}




void sEnter(void)
	{
	ASCIISend(13);
	ASCIISend(10);
	
	}
 


void port_init(void)
{
 
 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 = 0x03; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 UCSRB = 0x98; //Enable Rx INT,Disable Tx INT.
 	   	 	   //0xd8 to enable Rx&Tx INT;
}

#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
 //uart has received a character in UDR
 uchar tmpUDR,temp,tempyu;
 tmpUDR=UDR;
 
 temp=tmpUDR/100;
 temp+=48;
 UDR=temp;
 while(!(UCSRA&0X40));
 UCSRA|=0x40;
 
 tempyu=tmpUDR%100;
 temp=tempyu/10;
 temp+=48;
 UDR=temp;
 while(!(UCSRA&0X40));
 UCSRA|=0x40;
 
 tempyu%=10;
 temp=tempyu;
 temp+=48;
 UDR=temp;
 while(!(UCSRA&0X40));
 UCSRA|=0x40;
 
 sEnter();
 sEnter();
 ASCIISend(62);
 
}



//#pragma interrupt_handler uart0_tx_isr:14
//void uart0_tx_isr(void)
//{
 
 //character has been transmitted
//}

//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)
{
init_devices();

while(1)
{

}
}