usart.c

充电器源代码 才有AVR CPU 控制 可以对大部分电池充电

/*******************************************************************************
*  name: usart.c
*  author: fengzai(panda)
*  date: 2007.1.25
*  decribe: the usart
*******************************************************************************/

#include <avr/io.h>
#include <avr/interrupt.h>
//#include <avr/signal.h>
#include <util/delay.h>



/*------宏定义------*/
#define uchar	unsigned char
#define uint	unsigned int
#define BIT(x)	(1<<(x))
#define NOP()	asm("nop")
#define WDR() 	asm("wdr")

//unsigned char *p_send;
void put_c(unsigned char c);
void put_s(unsigned char *string);



//串口通信初始化,38400
void usart_init(void)
{
    UCSRB = 0x00;//禁止中断
    UCSRA = 0x00;
    UCSRC = BIT(URSEL) | 0x06;
    UBRRL = 0x0B;
    UBRRH = 0x00;
    UCSRB = 0x18;
}

void put_s(unsigned char *string)	//发送字符串
{
    while(*string)
    {
    put_c(*string++);
    }
}

void put_c(unsigned char c) //发送采用查询方式
{
    while( !(UCSRA & (1<<UDRE)) )
        ;
    UDR=c;
}