LED.rar_mega16流水

/*----------------------------------------------- 名称：IO口高低电平控制 论坛：www.doflye.net 编写：shifang 日期：2009.5 修改：无 内容：程序使用PB口作为输出演示 可以根据需要调整延时或者自行更改延时程序 ------------------------------------------------*/ #include <iom16v.h> #include <macros.h> /*------------------------------------------------ 延时函数 ------------------------------------------------*/ void Delay() { unsigned char a, b; for (a = 1; a; a++) for (b = 1; b; b++) ; } /*------------------------------------------------ 点亮LED ------------------------------------------------*/ void LED_On(int i) { PORTB = ~BIT(i); /* low output to turn LED on */ Delay(); } /*------------------------------------------------ 主函数 ------------------------------------------------*/ void main() { int i; DDRB = 0xFF; /* output */ PORTB = 0x55; /* all off */ //PORTB = 0xaa; while (1) { /* forward march */ for (i = 0; i < 8; i++) LED_On(i); /* backward march */ for (i = 8; i > 0; i--) LED_On(i); /* skip */ for (i = 0; i < 8; i += 2) LED_On(i); for (i = 7; i > 0; i -= 2) LED_On(i); } }