跑马灯.c

来自「ICC mega8例子」· C语言 代码 · 共 68 行

//ICC-AVR application builder : 2009-3-10 13:53:36
// Target : M8
// Crystal: 8.0000Mhz

#include <iom8v.h>
#include <macros.h>

void port_init(void)
{
 PORTB = 0x00;
 DDRB  = 0x00;
 PORTC = 0x00; //m103 output only
 DDRC  = 0x00;
 PORTD = 0x00;
 DDRD  = 0x00;
}

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

 MCUCR = 0x00;
 GICR  = 0x00;
 TIMSK = 0x00; //timer interrupt sources
 SEI(); //re-enable interrupts
 //all peripherals are now initialized
}

/************************************
Name         :小延时程序
Target       :atmega8
Crystal(晶振):8M
************************************/
void delay()
{
 unsigned int i;//最大值65536
 for (i=0;i<40000;i++)
 {;}
}

/************************************
Name         :跑马灯
Target       :atmega8
Crystal(晶振):8M
**************************************/
void show_LED()
{
 unsigned char i;
 DDRB=0xff;//设为输出
 for (i=0;i<8;i++)
 {
  PORTB=(1<<i);
  delay();
 }
}

void main()
{
 port_init();
 init_devices();
 while(1)
 {
  show_LED();
 }
}