testrxptr2000.c

ＰＴＲ2000的驱动程序

//ICC-AVR application builder : 2005-4-8 21:11:34
// Target : M16
// Crystal: 7.3728Mhz

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

#define PTR_CS 4
#define PTR_TXEN 7
unsigned int j=0;
unsigned int data=0;

char RX_data[100]={0};
unsigned char RX_counter=0;
void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x00;
 PORTB = 0x90;
 DDRB  = 0x90;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

//UART0 initialize
// desired baud rate: 9600
// actual: baud rate:9600 (0.0%)
// char size: 5 bits
// parity: Disabled
void uart0_init(void)
{
 UCSRB = 0x00; //disable while setting baud rate
 UCSRA = 0x00;
 UCSRC = BIT(URSEL) | 0x04;
 UBRRL = 0x2F; //set baud rate lo
 UBRRH = 0x00; //set baud rate hi
 UCSRB = 0x98;
}

#pragma interrupt_handler uart0_rx_isr:12
void uart0_rx_isr(void)
{
   //unsigned int data;
 //uart has received a character in UDR
     data=UDR;
     RX_data[RX_counter] = UDR;
	 if(RX_data[RX_counter]=='a')
	  j++;
      RX_data[0]=RX_data[RX_counter];      
      RX_counter++;
	 if(RX_counter==99)
	 RX_counter=0;
  //   for (i=0;i<RX_counter;i++);
  // putchar(RX_data[i]);
 // RX_counter=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)
{
 init_devices();
 PORTB&=~BIT(PB4);
 PORTB&=~BIT(PB7);
 while(1);
}