demo_6_7.c~

来自「AVR单片机嵌入式系统原理与应用实践例码」· C~ 代码 · 共 51 行

/*********************************************
File name           : demo_6_7.c
Chip type           : ATmega16
Program type        : Application
Clock frequency     : 4.000000 MHz
Memory model        : Small
External SRAM size  : 0
Data Stack size     : 256
*********************************************/

#include <mega16.h>
#include <delay.h>

flash unsigned char unsigned char_7[8]={0x10,0x38,0x7C,0xFE,0x38,0x38,0x38,0x38};

void display(unsigned char row)
{
	unsigned char i;
	for (i=0;i<=7;i++)
	{
		if (row <= 7)
			PORTA = unsigned char_7[row];
		else
			PORTA = 0;
		PORTC = ~(1<<i);
		delay_ms(2);
		PORTC = 0xFF;
		if (++row >= 12 ) row = 0; 		
	}
}

void main(void)
{
	unsigned char time_counter,i = 0;
	PORTA=0x00;
	DDRA=0xFF;
	PORTC=0xFF;
	DDRC=0xFF;

	while (1)
	{
		display(i);
		delay_ms(9);
		if (++time_counter >= 4)
		{
			time_counter = 0;
			if(++i >= 12) i=0;
		}
	};
}