lesson4.c

AVR mega16单片机的示例程序

#include <avr/io.h>

int main(void)
{
	char temp;
	unsigned int i,j;
	DDRB = 0xff;
	PORTB = 0b11100110;
	//PORTB = 0b00000001;
	while(1)
	{
		temp = PORTB;
		PORTB = PORTB << 1;
		if(temp & 0b10000000)
		{
			PORTB = PORTB | 0b00000001;
		}

		switch(temp & 0b10000000)
		{
			case 0:
			{
				//第7位为0
				break;
			}
			case 0b10000000:
			{
				//第7位为1
				break;
			}
			default:
			{
				//所有条件均不满足
				break;
			}
		}

		for(i = 0;i < 50;i ++)
		{
			for(j = 0;j < 1000;j ++);
		}
	}
}