uart._h

本程序是基于avr单片机的atmega48的控制16*4点阵型液晶。其中main文件调用LCD.c和LCD.h文件。用户可以直接把工程中的LCD.c和LCD.h文件放到自己的程序目录下即可。

#include <iom48v.h>

void delay(void);
void uart0_init(void);

void uart_send(unsigned char c);
unsigned char uart_rec(void);

void delay(void)
{
  unsigned long i;
  for(i=0;i<11142;i++);
}

//UART0 initialize
// desired baud rate: 9600
// actual: baud rate:8929 (7.5%)
void uart0_init(void)
{
 UCSR0B = 0x00; //disable while setting baud rate
 UCSR0A = 0x00;
 UCSR0C = 0x06;
 UBRR0L = 12; //set baud rate lo
 UBRR0H = 0x00; //set baud rate hi
 UCSR0B = 0x98;
}

void uart_send(unsigned char c)
{
  // while(!(UCSR0A&0x40));
      UDR0=c;
	  while(!(UCSR0A&0x40));
}

unsigned char uart_rec(void)
{
   while(!(UCSR0A&(1<<RXC0)));
   return UDR0;
}