基于AVR单片机I/O演示C语言程序
// Target : M8
// Crystal: 11.059Mhz
#include
#include
//起始全亮
void port_init(void)
{
PORTB = 0x00;
DDRB = 0xFF;
PORTC = 0x00;
DDRC = 0x7F;
PORTD = 0x00;
DDRD = 0xFF;
}
//延时函数,大约1ms;
void delay(char tim)
{
unsigned int i,j;
for(i=0;i
}
// led全亮
void led_on(void)
{
PORTB = 0x00;
PORTC = 0x00;
PORTD = 0x00;
delay(5000);
}
//led全灭
void led_off(void)
{
PORTB = 0xFF;
PORTC = 0xFF;
PORTD = 0xFF;
delay(5000);
}
//PB隔1步进
void pd_1(void)
{
char i;
for (i = 0; i < 8; i++)
{
PORTB = ~(1 << (i));//位操作结合移位操作
delay(5000);
}
}
//PB隔2步进
void pd_2(void)
{
char i;
for (i = 0; i < 8; i+=2)
{
PORTB = ~(1 << (i));//位操作结合移位操作
delay(5000);
}
}
//call this routine to initialise 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 initialised
}
//
void main(void)
{
init_devices();
while(1)
{
led_on();
led_off();
led_on();
led_off();
pd_1();
led_on();
led_off();
pd_2();
led_on();
led_off();
//赋值(会给所有的位以特定值),使pb0为0,led亮;
PORTB = 0xFE;
delay(5000);
//置位(不影响其他位),使pb0为1,led灭;
PORTB |= 0x01;
delay(5000);
//清零(不影响其他位),使pb0为0,led亮;
PORTB &= ~0x01;
delay(5000);
//反转(不影响其他位),使pb0为1,led灭;
PORTB ^= 0x01;
delay(5000);
}
}
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