avr.c

AVR单片机基础上的以太网协议编程

/**************************************************************************
**
**    文件: AVR.c
**    描述: 该文件完成MCU的初始化
**
**************************************************************************/

#include <iom128v.h>
#include <macros.h>

void Port_Init(void)
{
    PORTA = 0x00;
    DDRA  = 0x00;
    PORTB = 0x00;
    DDRB  = 0x00;
    PORTC = 0x00; //m103 output only
    DDRC  = 0x00;
    PORTD = 0x00;
    DDRD  = 0x00;
    PORTE = 0x00;
    DDRE  = 0x00;
    DDRE |=1<<6; //测试灯初始化，引脚定义为输出
    PORTF = 0x00;
    DDRF  = 0x00;
    PORTG = 0x00;
    DDRG  = 0x00;
}

void MCU_Init(void)
{
    CLI();         //禁止所有中断，相当于SREG &= !(1<<I);
    XDIV  = 0x00;  //分频控制寄存器，不对源时钟分频，使用内部标定的RC振荡器
    XMCRA = 0x00;  //外部存储器等待周期选择，不等待
    Port_Init();
    MCUCR = 0x00;
    MCUCR |= (1<<SRE); //单片机使能外部SRAM
    EICRA = 0x00;  //INT3:0的中断电平选择
    EICRB = 0xc0;  //RTL8019的中断请求信号为高电平有效，没用到
    EIMSK = 0x00;
    EIMSK |= (1<<INT7); //RTL8019的中断引脚接到单片机的INT7脚，参见硬件连接,没用到
    TIMSK = 0x00;  //timer interrupt sources
    TIMSK |= (1<<TOIE1); //TC1溢出中断使能
    TIMSK |= (1<<TOIE2); //TC2溢出中断使能
    ETIMSK = 0x00; //extended timer interrupt sources
    ETIMSK |= (1<<TOIE3); //TC3溢出中断使能
}

/******************* End Of File **********************/