main._c

一个关于AVR单片机的例程

//ICC-AVR application builder : 2007-2-17 7:56:49
// Target : M16
// Crystal: 7.3728Mhz
// www.avrvi.com AVR与虚拟仪器
// 硬件连接：
// PA0—————LED0
// PA1—————LED1
// PD2—————独立按键A
// PD3—————独立按键B

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

void port_init(void)
{
 PORTA = 0x00;
 DDRA  = 0x03; //PORTA.0 PORTA.1 输出，LED指示
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD |= (1<<2)|(1<<3); //使能内部上拉
 DDRD = 0x00; //PD2,PD3 对应INT0，INT1 一定要设置为输入
}

#pragma interrupt_handler int0_isr:2
void int0_isr(void)
{
 //external interupt on INT0
 PORTA ^= 0x01;  //PA0取反
}

#pragma interrupt_handler int1_isr:3
void int1_isr(void)
{
 //external interupt on INT1
 PORTA ^= 0x02;  //PA1取反
}

//call this routine to initialize all peripherals
void init_devices(void)
{
 //stop errant interrupts until set up
 CLI(); //disable all interrupts
 port_init();

 MCUCR = 0x0A; //允许INT0和INT1外部中断
 GICR  = 0xC0;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

void main(void)
{
 init_devices();
 while(1)
 ; //主循环什么也不干
}